| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/07/23 10:37 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": [
"BRCMFMAC",
"BRCMFMAC_SDIO",
"MMC_VUB300"
],
"FocusSymbols": [
"brcmf_sdio_read_control"
],
"Reasoning": "The patch fixes a memory leak in the error paths of `brcmf_sdio_read_control` within the Broadcom FullMAC SDIO driver. This code is reachable in virtualized environments via USB fuzzing using the `vub300` USB-to-SDIO bridge driver, which allows emulating SDIO devices and triggering SDIO driver paths.",
"WorthFuzzing": true
} |
| 1/1 | 2026/07/23 10:37 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 4b68d5b689b031372bea2d4fae7ce1b673318a94\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Jul 23 10:37:03 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\nindex b725c64e5b5c63..0900211ba2fe83 100644\n--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\n+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\n@@ -1792,6 +1792,7 @@ brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)\n \t\tbrcmf_err(\"%d-byte control read exceeds %d-byte buffer\\n\",\n \t\t\t rdlen, bus-\u003esdiodev-\u003ebus_if-\u003emaxctl);\n \t\tbrcmf_sdio_rxfail(bus, false, false);\n+\t\tvfree(buf);\n \t\tgoto done;\n \t}\n \n@@ -1800,6 +1801,7 @@ brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)\n \t\t\t len, len - doff, bus-\u003esdiodev-\u003ebus_if-\u003emaxctl);\n \t\tbus-\u003esdcnt.rx_toolong++;\n \t\tbrcmf_sdio_rxfail(bus, false, false);\n+\t\tvfree(buf);\n \t\tgoto done;\n \t}\n \n@@ -1813,6 +1815,7 @@ brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)\n \t\t\t rdlen, sdret);\n \t\tbus-\u003esdcnt.rxc_errors++;\n \t\tbrcmf_sdio_rxfail(bus, true, true);\n+\t\tvfree(buf);\n \t\tgoto done;\n \t} else\n \t\tmemcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);\n"
} |
| 2/1 | 2026/07/23 10:37 | agent | patch-evaluator |
1mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"BRCMFMAC",
"BRCMFMAC_SDIO",
"MMC_VUB300"
],
"FocusSymbols": [
"brcmf_sdio_read_control"
],
"Reasoning": "The patch fixes a memory leak in the error paths of `brcmf_sdio_read_control` within the Broadcom FullMAC SDIO driver. This code is reachable in virtualized environments via USB fuzzing using the `vub300` USB-to-SDIO bridge driver, which allows emulating SDIO devices and triggering SDIO driver paths.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit 4b68d5b689b031372bea2d4fae7ce1b673318a94
Author: syz-cluster <triage@syzkaller.com>
Date: Thu Jul 23 10:37:03 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index b725c64e5b5c63..0900211ba2fe83 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -1792,6 +1792,7 @@ brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
brcmf_err("%d-byte control read exceeds %d-byte buffer\n",
rdlen, bus->sdiodev->bus_if->maxctl);
brcmf_sdio_rxfail(bus, false, false);
+ vfree(buf);
goto done;
}
@@ -1800,6 +1801,7 @@ brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
len, len - doff, bus->sdiodev->bus_if->maxctl);
bus->sdcnt.rx_toolong++;
brcmf_sdio_rxfail(bus, false, false);
+ vfree(buf);
goto done;
}
@@ -1813,6 +1815,7 @@ brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
rdlen, sdret);
bus->sdcnt.rxc_errors++;
brcmf_sdio_rxfail(bus, true, true);
+ vfree(buf);
goto done;
} else
memcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);
|
| 3/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2236 output: 56 thoughts: 90 Thoughts: **Analyzing a Potential Memory Leak in brcmfmac's SDIO Driver** Okay, so this patch is targeting `drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c`. Immediately, my spidey-sense is tingling – usually when we're modifying low-level drivers like this, especially around memory management, it's a critical fix or performance enhancement. The core of the change seems straightforward: `vfree(buf);` is being added before a `goto done;` in a few error paths within `brcmf_sdio_read_control`. That screams "memory leak fix" to me, doesn't it? The `buf` variable probably holds some dynamically allocated memory that's not being released correctly. Let's dive into `brcmf_sdio_read_control` and verify that hypothesis. I'll want to quickly confirm the allocation of `buf`, how the function is meant to behave, and precisely *why* those error paths didn't previously free it. Understanding the allocation pattern and potential failure scenarios is key to confirming the fix and ensuring we don't introduce any new issues. I'll need to check the code that's not only within the `brcmf_sdio_read_control` but related functions too to see if `buf` is freed properly under normal operation. Hopefully, this simple addition addresses a genuine leak without unintended consequences. |
| 4/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "brcmf_sdio_read_control",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=1756=static void\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:1757:brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1758-{\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=1859=static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1919-\t\t\tif (rd-\u003echannel == SDPCM_CONTROL_CHANNEL) {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:1920:\t\t\t\tbrcmf_sdio_read_control(bus, bus-\u003erxhdr,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1921-\t\t\t\t\t\t\trd-\u003elen,\n"
} |
| 5/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3039 output: 56 thoughts: 24 Thoughts: Okay, let's dive into this code. **Analyzing Reachability in `brcmf_sdio_read_control`** Alright, my immediate thought is to zero in on this `brcmf_sdio_read_control` function. I want to quickly ascertain its accessibility. Is it something that a malicious actor could potentially trigger under specific conditions, or is it buried deep within a tightly controlled sequence? My analysis is, of course, focusing on understanding possible attack vectors and potential vulnerabilities. I need to know how easily an attacker could manipulate its execution path. This is key for evaluating the security profile of this section of code. |
| 6/2 | 2026/07/23 10:37 | tool | read-file |
0mArgs:{
"File": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c",
"FirstLine": 1756,
"LineCount": 100
}Results: {
"Contents": "1756:\tstatic void\n1757:\tbrcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)\n1758:\t{\n1759:\t\tuint rdlen, pad;\n1760:\t\tu8 *buf = NULL, *rbuf;\n1761:\t\tint sdret;\n1762:\t\n1763:\t\tbrcmf_dbg(SDIO, \"Enter\\n\");\n1764:\t\tif (bus-\u003erxblen)\n1765:\t\t\tbuf = vzalloc(bus-\u003erxblen);\n1766:\t\tif (!buf)\n1767:\t\t\tgoto done;\n1768:\t\n1769:\t\trbuf = bus-\u003erxbuf;\n1770:\t\tpad = ((unsigned long)rbuf % bus-\u003ehead_align);\n1771:\t\tif (pad)\n1772:\t\t\trbuf += (bus-\u003ehead_align - pad);\n1773:\t\n1774:\t\t/* Copy the already-read portion over */\n1775:\t\tmemcpy(buf, hdr, BRCMF_FIRSTREAD);\n1776:\t\tif (len \u003c= BRCMF_FIRSTREAD)\n1777:\t\t\tgoto gotpkt;\n1778:\t\n1779:\t\t/* Raise rdlen to next SDIO block to avoid tail command */\n1780:\t\trdlen = len - BRCMF_FIRSTREAD;\n1781:\t\tif (bus-\u003eroundup \u0026\u0026 bus-\u003eblocksize \u0026\u0026 (rdlen \u003e bus-\u003eblocksize)) {\n1782:\t\t\tpad = bus-\u003eblocksize - (rdlen % bus-\u003eblocksize);\n1783:\t\t\tif ((pad \u003c= bus-\u003eroundup) \u0026\u0026 (pad \u003c bus-\u003eblocksize) \u0026\u0026\n1784:\t\t\t ((len + pad) \u003c bus-\u003esdiodev-\u003ebus_if-\u003emaxctl))\n1785:\t\t\t\trdlen += pad;\n1786:\t\t} else if (rdlen % bus-\u003ehead_align) {\n1787:\t\t\trdlen += bus-\u003ehead_align - (rdlen % bus-\u003ehead_align);\n1788:\t\t}\n1789:\t\n1790:\t\t/* Drop if the read is too big or it exceeds our maximum */\n1791:\t\tif ((rdlen + BRCMF_FIRSTREAD) \u003e bus-\u003esdiodev-\u003ebus_if-\u003emaxctl) {\n1792:\t\t\tbrcmf_err(\"%d-byte control read exceeds %d-byte buffer\\n\",\n1793:\t\t\t\t rdlen, bus-\u003esdiodev-\u003ebus_if-\u003emaxctl);\n1794:\t\t\tbrcmf_sdio_rxfail(bus, false, false);\n1795:\t\t\tvfree(buf);\n1796:\t\t\tgoto done;\n1797:\t\t}\n1798:\t\n1799:\t\tif ((len - doff) \u003e bus-\u003esdiodev-\u003ebus_if-\u003emaxctl) {\n1800:\t\t\tbrcmf_err(\"%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\\n\",\n1801:\t\t\t\t len, len - doff, bus-\u003esdiodev-\u003ebus_if-\u003emaxctl);\n1802:\t\t\tbus-\u003esdcnt.rx_toolong++;\n1803:\t\t\tbrcmf_sdio_rxfail(bus, false, false);\n1804:\t\t\tvfree(buf);\n1805:\t\t\tgoto done;\n1806:\t\t}\n1807:\t\n1808:\t\t/* Read remain of frame body */\n1809:\t\tsdret = brcmf_sdiod_recv_buf(bus-\u003esdiodev, rbuf, rdlen);\n1810:\t\tbus-\u003esdcnt.f2rxdata++;\n1811:\t\n1812:\t\t/* Control frame failures need retransmission */\n1813:\t\tif (sdret \u003c 0) {\n1814:\t\t\tbrcmf_err(\"read %d control bytes failed: %d\\n\",\n1815:\t\t\t\t rdlen, sdret);\n1816:\t\t\tbus-\u003esdcnt.rxc_errors++;\n1817:\t\t\tbrcmf_sdio_rxfail(bus, true, true);\n1818:\t\t\tvfree(buf);\n1819:\t\t\tgoto done;\n1820:\t\t} else\n1821:\t\t\tmemcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);\n1822:\t\n1823:\tgotpkt:\n1824:\t\n1825:\t\tbrcmf_dbg_hex_dump(BRCMF_BYTES_ON() \u0026\u0026 BRCMF_CTL_ON(),\n1826:\t\t\t\t buf, len, \"RxCtrl:\\n\");\n1827:\t\n1828:\t\t/* Point to valid data and indicate its length */\n1829:\t\tspin_lock_bh(\u0026bus-\u003erxctl_lock);\n1830:\t\tif (bus-\u003erxctl) {\n1831:\t\t\tbrcmf_err(\"last control frame is being processed.\\n\");\n1832:\t\t\tspin_unlock_bh(\u0026bus-\u003erxctl_lock);\n1833:\t\t\tvfree(buf);\n1834:\t\t\tgoto done;\n1835:\t\t}\n1836:\t\tbus-\u003erxctl = buf + doff;\n1837:\t\tbus-\u003erxctl_orig = buf;\n1838:\t\tbus-\u003erxlen = len - doff;\n1839:\t\tspin_unlock_bh(\u0026bus-\u003erxctl_lock);\n1840:\t\n1841:\tdone:\n1842:\t\t/* Awake any waiters */\n1843:\t\tbrcmf_sdio_dcmd_resp_wake(bus);\n1844:\t}\n1845:\t\n1846:\t/* Pad read to blocksize for efficiency */\n1847:\tstatic void brcmf_sdio_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)\n1848:\t{\n1849:\t\tif (bus-\u003eroundup \u0026\u0026 bus-\u003eblocksize \u0026\u0026 *rdlen \u003e bus-\u003eblocksize) {\n1850:\t\t\t*pad = bus-\u003eblocksize - (*rdlen % bus-\u003eblocksize);\n1851:\t\t\tif (*pad \u003c= bus-\u003eroundup \u0026\u0026 *pad \u003c bus-\u003eblocksize \u0026\u0026\n1852:\t\t\t *rdlen + *pad + BRCMF_FIRSTREAD \u003c MAX_RX_DATASZ)\n1853:\t\t\t\t*rdlen += *pad;\n1854:\t\t} else if (*rdlen % bus-\u003ehead_align) {\n1855:\t\t\t*rdlen += bus-\u003ehead_align - (*rdlen % bus-\u003ehead_align);\n"
} |
| 7/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4970 output: 46 thoughts: 145 Thoughts: **Analyzing a SDIO Driver Patch** Okay, so this patch addresses a memory leak within `brcmf_sdio_read_control`. Functionally, it's a straightforward fix, but I need to think about the broader implications. The function belongs to the Broadcom 802.11 SDIO driver, so my first thought is: is this even relevant in a virtualized context? SDIO is usually tied to physical hardware. I know there *could* be some form of SDIO emulation, or perhaps the issue is exposed via another bus... But I'm pretty sure syzkaller doesn't have native SDIO emulation. Now, does syzkaller fuzz SDIO? I know it handles USB and other bus interfaces. It is important to know if we are capable of reproducing this in a fuzzer or not. I'll need to check the syzkaller documentation or the fuzzing configurations to confirm whether SDIO fuzzing support exists. |
| 8/2 | 2026/07/23 10:37 | tool | grepper |
0mError:no matches Args: {
"Expression": "sdio",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig"
}Results: {
"error": "no matches"
} |
| 9/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5378 output: 51 thoughts: 12 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience: **Kconfig Dive for brcmfmac** Alright, let's get down to brass tacks. I need to understand the configuration landscape for the brcmfmac driver. My first instinct, as always, is to head straight to the Kconfig files. That's the primary source of truth for the available options, dependencies, and default configurations related to this particular driver. I need to quickly ascertain what parameters are controllable at compile time. Are there any conditional dependencies I'm overlooking? Any subtle but important CONFIG options that are going to impact the build or runtime behavior that I need to be aware of? This will help me diagnose certain issues later on. Let's see what's what. |
| 10/2 | 2026/07/23 10:37 | tool | read-file |
0mArgs:{
"File": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig",
"FirstLine": 1,
"LineCount": 100
}Results: {
"Contents": " 1:\tconfig BRCMFMAC\n 2:\t\ttristate \"Broadcom FullMAC WLAN driver\"\n 3:\t\tdepends on CFG80211\n 4:\t\tselect BRCMUTIL\n 5:\t\thelp\n 6:\t\t This module adds support for wireless adapters based on Broadcom\n 7:\t\t FullMAC chipsets. It has to work with at least one of the bus\n 8:\t\t interface support. If you choose to build a module, it'll be called\n 9:\t\t brcmfmac.ko.\n 10:\t\n 11:\tconfig BRCMFMAC_PROTO_BCDC\n 12:\t\tbool\n 13:\t\n 14:\tconfig BRCMFMAC_PROTO_MSGBUF\n 15:\t\tbool\n 16:\t\n 17:\tconfig BRCMFMAC_SDIO\n 18:\t\tbool \"SDIO bus interface support for FullMAC driver\"\n 19:\t\tdepends on (MMC = y || MMC = BRCMFMAC)\n 20:\t\tdepends on BRCMFMAC\n 21:\t\tselect BRCMFMAC_PROTO_BCDC\n 22:\t\tselect FW_LOADER\n 23:\t\tdefault y\n 24:\t\thelp\n 25:\t\t This option enables the SDIO bus interface support for Broadcom\n 26:\t\t IEEE802.11n embedded FullMAC WLAN driver. Say Y if you want to\n 27:\t\t use the driver for a SDIO wireless card.\n 28:\t\n 29:\tconfig BRCMFMAC_USB\n 30:\t\tbool \"USB bus interface support for FullMAC driver\"\n 31:\t\tdepends on (USB = y || USB = BRCMFMAC)\n 32:\t\tdepends on BRCMFMAC\n 33:\t\tselect BRCMFMAC_PROTO_BCDC\n 34:\t\tselect FW_LOADER\n 35:\t\thelp\n 36:\t\t This option enables the USB bus interface support for Broadcom\n 37:\t\t IEEE802.11n embedded FullMAC WLAN driver. Say Y if you want to\n 38:\t\t use the driver for an USB wireless card.\n 39:\t\n 40:\tconfig BRCMFMAC_PCIE\n 41:\t\tbool \"PCIE bus interface support for FullMAC driver\"\n 42:\t\tdepends on BRCMFMAC\n 43:\t\tdepends on PCI\n 44:\t\tselect BRCMFMAC_PROTO_MSGBUF\n 45:\t\tselect FW_LOADER\n 46:\t\thelp\n 47:\t\t This option enables the PCIE bus interface support for Broadcom\n 48:\t\t IEEE802.11ac embedded FullMAC WLAN driver. Say Y if you want to\n 49:\t\t use the driver for an PCIE wireless card.\n 50:\t\n"
} |
| 11/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6309 output: 29 thoughts: 97 Thoughts: **Analyzing the Virtualization Challenge** Okay, so the driver in question is `BRCMFMAC_SDIO`. My initial thought is that SDIO drivers typically don't play nicely in virtualized environments like Google Compute Engine or QEMU unless there's an SDIO emulator present. I need to figure out if syzkaller offers one. I know it supports USB through `dummy_hcd` and PCI, at least partially. But SDIO? That's the question. Alright, before I jump to any conclusions, let's step back and see if the kernel itself offers some form of MMC/SDIO emulation that syzkaller *could* potentially leverage. Maybe there's a kernel feature, even a simple one, that could provide a base for testing. That seems like the logical next step in my assessment. |
| 12/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "mmc.*dummy",
"PathPrefix": "drivers/mmc/"
}Results: {
"Output": "drivers/mmc/core/sdio_irq.c=30=static int sdio_get_pending_irqs(struct mmc_host *host, u8 *pending)\n--\ndrivers/mmc/core/sdio_irq.c-51-\t\t */\ndrivers/mmc/core/sdio_irq.c:52:\t\tmmc_io_rw_direct(card, 0, 0, 0xff, 0, \u0026dummy);\ndrivers/mmc/core/sdio_irq.c-53-\t}\n"
} |
| 13/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6757 output: 32 thoughts: 77 Thoughts: Okay, here's my summary, taking the perspective of someone knowledgeable in embedded systems and device drivers: **MMC Host Controller Inquiry** Hmm, I was under the impression we didn't have a dummy MMC host controller. A quick mental scan of the kernel tree... nope, nothing immediately springs to mind. But wait, I'm forgetting about something. There's that `drivers/mmc/host/vub300.c` file! Right, that's a USB-to-SDIO bridge. That could be interesting. The implication is pretty clear: If syzkaller is successfully fuzzing USB, then, *in theory*, it could potentially reach an SDIO card through the `vub300` driver. That's a potentially significant attack surface we might have overlooked before. The next step is obvious. Let's dig into `vub300` and confirm whether it's capable of actually instantiating and controlling SDIO cards. Is the infrastructure in place, or is it more of a theoretical bridge? Understanding its capabilities is crucial to assessing the fuzzing potential here. |
| 14/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "vub300",
"PathPrefix": "drivers/mmc/host/"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 1640 lines.\nUse more precise expression if possible.\n\ndrivers/mmc/host/Kconfig=920=config MMC_VUB300\n--\ndrivers/mmc/host/Kconfig-944-\t To compile this mmc host controller driver as a module,\ndrivers/mmc/host/Kconfig:945:\t choose M here: the module will be called vub300.\ndrivers/mmc/host/Kconfig-946-\n--\ndrivers/mmc/host/Makefile=62=obj-$(CONFIG_MMC_JZ4740)\t+= jz4740_mmc.o\ndrivers/mmc/host/Makefile:63:obj-$(CONFIG_MMC_VUB300)\t+= vub300.o\ndrivers/mmc/host/Makefile-64-obj-$(CONFIG_MMC_USHC)\t\t+= ushc.o\n--\ndrivers/mmc/host/vub300.c=260=MODULE_PARM_DESC(firmware_rom_wait_states,\n--\ndrivers/mmc/host/vub300.c-265-#define VUB300_PRODUCT_ID\t0x012C\ndrivers/mmc/host/vub300.c:266:static const struct usb_device_id vub300_table[] = {\ndrivers/mmc/host/vub300.c-267-\t{USB_DEVICE(ELAN_VENDOR_ID, VUB300_PRODUCT_ID)},\n--\ndrivers/mmc/host/vub300.c-270-};\ndrivers/mmc/host/vub300.c:271:MODULE_DEVICE_TABLE(usb, vub300_table);\ndrivers/mmc/host/vub300.c-272-\n--\ndrivers/mmc/host/vub300.c=286=struct sdio_register {\n--\ndrivers/mmc/host/vub300.c-295-\ndrivers/mmc/host/vub300.c:296:struct vub300_mmc_host {\ndrivers/mmc/host/vub300.c-297-\tstruct usb_device *udev;\n--\ndrivers/mmc/host/vub300.c-354-\ndrivers/mmc/host/vub300.c:355:#define kref_to_vub300_mmc_host(d) container_of(d, struct vub300_mmc_host, kref)\ndrivers/mmc/host/vub300.c-356-#define SET_TRANSFER_PSEUDOCODE\t\t21\n--\ndrivers/mmc/host/vub300.c-368-\ndrivers/mmc/host/vub300.c:369:static void vub300_delete(struct kref *kref)\ndrivers/mmc/host/vub300.c-370-{\t\t\t\t/* kref callback - softirq */\ndrivers/mmc/host/vub300.c:371:\tstruct vub300_mmc_host *vub300 = kref_to_vub300_mmc_host(kref);\ndrivers/mmc/host/vub300.c:372:\tstruct mmc_host *mmc = vub300-\u003emmc;\ndrivers/mmc/host/vub300.c-373-\ndrivers/mmc/host/vub300.c:374:\tusb_free_urb(vub300-\u003ecommand_out_urb);\ndrivers/mmc/host/vub300.c:375:\tvub300-\u003ecommand_out_urb = NULL;\ndrivers/mmc/host/vub300.c:376:\tusb_free_urb(vub300-\u003ecommand_res_urb);\ndrivers/mmc/host/vub300.c:377:\tvub300-\u003ecommand_res_urb = NULL;\ndrivers/mmc/host/vub300.c:378:\tusb_put_dev(vub300-\u003eudev);\ndrivers/mmc/host/vub300.c-379-\tmmc_free_host(mmc);\ndrivers/mmc/host/vub300.c-380-\t/*\ndrivers/mmc/host/vub300.c:381:\t * and hence also frees vub300\ndrivers/mmc/host/vub300.c-382-\t * which is contained at the end of struct mmc\n--\ndrivers/mmc/host/vub300.c-385-\ndrivers/mmc/host/vub300.c:386:static void vub300_queue_cmnd_work(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-387-{\ndrivers/mmc/host/vub300.c:388:\tkref_get(\u0026vub300-\u003ekref);\ndrivers/mmc/host/vub300.c:389:\tif (queue_work(cmndworkqueue, \u0026vub300-\u003ecmndwork)) {\ndrivers/mmc/host/vub300.c-390-\t\t/*\n--\ndrivers/mmc/host/vub300.c-401-\t\t */\ndrivers/mmc/host/vub300.c:402:\t\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-403-\t}\n--\ndrivers/mmc/host/vub300.c-405-\ndrivers/mmc/host/vub300.c:406:static void vub300_queue_poll_work(struct vub300_mmc_host *vub300, int delay)\ndrivers/mmc/host/vub300.c-407-{\ndrivers/mmc/host/vub300.c:408:\tkref_get(\u0026vub300-\u003ekref);\ndrivers/mmc/host/vub300.c:409:\tif (queue_delayed_work(pollworkqueue, \u0026vub300-\u003epollwork, delay)) {\ndrivers/mmc/host/vub300.c-410-\t\t/*\n--\ndrivers/mmc/host/vub300.c-421-\t\t */\ndrivers/mmc/host/vub300.c:422:\t\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-423-\t}\n--\ndrivers/mmc/host/vub300.c-425-\ndrivers/mmc/host/vub300.c:426:static void vub300_queue_dead_work(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-427-{\ndrivers/mmc/host/vub300.c:428:\tkref_get(\u0026vub300-\u003ekref);\ndrivers/mmc/host/vub300.c:429:\tif (queue_work(deadworkqueue, \u0026vub300-\u003edeadwork)) {\ndrivers/mmc/host/vub300.c-430-\t\t/*\n--\ndrivers/mmc/host/vub300.c-441-\t\t */\ndrivers/mmc/host/vub300.c:442:\t\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-443-\t}\n--\ndrivers/mmc/host/vub300.c=446=static void irqpoll_res_completed(struct urb *urb)\ndrivers/mmc/host/vub300.c-447-{\t\t\t\t/* urb completion handler - hardirq */\ndrivers/mmc/host/vub300.c:448:\tstruct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb-\u003econtext;\ndrivers/mmc/host/vub300.c-449-\tif (urb-\u003estatus)\ndrivers/mmc/host/vub300.c:450:\t\tvub300-\u003eusb_transport_fail = urb-\u003estatus;\ndrivers/mmc/host/vub300.c:451:\tcomplete(\u0026vub300-\u003eirqpoll_complete);\ndrivers/mmc/host/vub300.c-452-}\n--\ndrivers/mmc/host/vub300.c=454=static void irqpoll_out_completed(struct urb *urb)\ndrivers/mmc/host/vub300.c-455-{\t\t\t\t/* urb completion handler - hardirq */\ndrivers/mmc/host/vub300.c:456:\tstruct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb-\u003econtext;\ndrivers/mmc/host/vub300.c-457-\tif (urb-\u003estatus) {\ndrivers/mmc/host/vub300.c:458:\t\tvub300-\u003eusb_transport_fail = urb-\u003estatus;\ndrivers/mmc/host/vub300.c:459:\t\tcomplete(\u0026vub300-\u003eirqpoll_complete);\ndrivers/mmc/host/vub300.c-460-\t\treturn;\n--\ndrivers/mmc/host/vub300.c-463-\t\tunsigned int pipe =\ndrivers/mmc/host/vub300.c:464:\t\t\tusb_rcvbulkpipe(vub300-\u003eudev, vub300-\u003ecmnd_res_ep);\ndrivers/mmc/host/vub300.c:465:\t\tusb_fill_bulk_urb(vub300-\u003ecommand_res_urb, vub300-\u003eudev, pipe,\ndrivers/mmc/host/vub300.c:466:\t\t\t\t \u0026vub300-\u003eresp, sizeof(vub300-\u003eresp),\ndrivers/mmc/host/vub300.c:467:\t\t\t\t irqpoll_res_completed, vub300);\ndrivers/mmc/host/vub300.c:468:\t\tvub300-\u003ecommand_res_urb-\u003eactual_length = 0;\ndrivers/mmc/host/vub300.c:469:\t\tret = usb_submit_urb(vub300-\u003ecommand_res_urb, GFP_ATOMIC);\ndrivers/mmc/host/vub300.c-470-\t\tif (ret) {\ndrivers/mmc/host/vub300.c:471:\t\t\tvub300-\u003eusb_transport_fail = ret;\ndrivers/mmc/host/vub300.c:472:\t\t\tcomplete(\u0026vub300-\u003eirqpoll_complete);\ndrivers/mmc/host/vub300.c-473-\t\t}\n--\ndrivers/mmc/host/vub300.c-477-\ndrivers/mmc/host/vub300.c:478:static void send_irqpoll(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-479-{\ndrivers/mmc/host/vub300.c:480:\t/* cmd_mutex is held by vub300_pollwork_thread */\ndrivers/mmc/host/vub300.c-481-\tint retval;\ndrivers/mmc/host/vub300.c-482-\tint timeout = 0xFFFF \u0026 (0x0001FFFF - firmware_irqpoll_timeout);\ndrivers/mmc/host/vub300.c:483:\tvub300-\u003ecmnd.poll.header_size = 22;\ndrivers/mmc/host/vub300.c:484:\tvub300-\u003ecmnd.poll.header_type = 1;\ndrivers/mmc/host/vub300.c:485:\tvub300-\u003ecmnd.poll.port_number = 0;\ndrivers/mmc/host/vub300.c:486:\tvub300-\u003ecmnd.poll.command_type = 2;\ndrivers/mmc/host/vub300.c:487:\tvub300-\u003ecmnd.poll.poll_timeout_lsb = 0xFF \u0026 (unsigned)timeout;\ndrivers/mmc/host/vub300.c:488:\tvub300-\u003ecmnd.poll.poll_timeout_msb = 0xFF \u0026 (unsigned)(timeout \u003e\u003e 8);\ndrivers/mmc/host/vub300.c:489:\tusb_fill_bulk_urb(vub300-\u003ecommand_out_urb, vub300-\u003eudev,\ndrivers/mmc/host/vub300.c:490:\t\t\t usb_sndbulkpipe(vub300-\u003eudev, vub300-\u003ecmnd_out_ep)\ndrivers/mmc/host/vub300.c:491:\t\t\t , \u0026vub300-\u003ecmnd, sizeof(vub300-\u003ecmnd)\ndrivers/mmc/host/vub300.c:492:\t\t\t , irqpoll_out_completed, vub300);\ndrivers/mmc/host/vub300.c:493:\tretval = usb_submit_urb(vub300-\u003ecommand_out_urb, GFP_KERNEL);\ndrivers/mmc/host/vub300.c-494-\tif (0 \u003e retval) {\ndrivers/mmc/host/vub300.c:495:\t\tvub300-\u003eusb_transport_fail = retval;\ndrivers/mmc/host/vub300.c:496:\t\tvub300_queue_poll_work(vub300, 1);\ndrivers/mmc/host/vub300.c:497:\t\tcomplete(\u0026vub300-\u003eirqpoll_complete);\ndrivers/mmc/host/vub300.c-498-\t\treturn;\n--\ndrivers/mmc/host/vub300.c-503-\ndrivers/mmc/host/vub300.c:504:static void new_system_port_status(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-505-{\ndrivers/mmc/host/vub300.c:506:\tint old_card_present = vub300-\u003ecard_present;\ndrivers/mmc/host/vub300.c-507-\tint new_card_present =\ndrivers/mmc/host/vub300.c:508:\t\t(0x0001 \u0026 vub300-\u003esystem_port_status.port_flags) ? 1 : 0;\ndrivers/mmc/host/vub300.c:509:\tvub300-\u003eread_only =\ndrivers/mmc/host/vub300.c:510:\t\t(0x0010 \u0026 vub300-\u003esystem_port_status.port_flags) ? 1 : 0;\ndrivers/mmc/host/vub300.c-511-\tif (new_card_present \u0026\u0026 !old_card_present) {\ndrivers/mmc/host/vub300.c:512:\t\tdev_info(\u0026vub300-\u003eudev-\u003edev, \"card just inserted\\n\");\ndrivers/mmc/host/vub300.c:513:\t\tvub300-\u003ecard_present = 1;\ndrivers/mmc/host/vub300.c:514:\t\tvub300-\u003ebus_width = 0;\ndrivers/mmc/host/vub300.c-515-\t\tif (disable_offload_processing)\ndrivers/mmc/host/vub300.c:516:\t\t\tstrscpy(vub300-\u003evub_name, \"EMPTY Processing Disabled\",\ndrivers/mmc/host/vub300.c:517:\t\t\t\tsizeof(vub300-\u003evub_name));\ndrivers/mmc/host/vub300.c-518-\t\telse\ndrivers/mmc/host/vub300.c:519:\t\t\tvub300-\u003evub_name[0] = 0;\ndrivers/mmc/host/vub300.c:520:\t\tmmc_detect_change(vub300-\u003emmc, 1);\ndrivers/mmc/host/vub300.c-521-\t} else if (!new_card_present \u0026\u0026 old_card_present) {\ndrivers/mmc/host/vub300.c:522:\t\tdev_info(\u0026vub300-\u003eudev-\u003edev, \"card just ejected\\n\");\ndrivers/mmc/host/vub300.c:523:\t\tvub300-\u003ecard_present = 0;\ndrivers/mmc/host/vub300.c:524:\t\tmmc_detect_change(vub300-\u003emmc, 0);\ndrivers/mmc/host/vub300.c-525-\t} else {\n--\ndrivers/mmc/host/vub300.c-529-\ndrivers/mmc/host/vub300.c:530:static void __add_offloaded_reg_to_fifo(struct vub300_mmc_host *vub300,\ndrivers/mmc/host/vub300.c-531-\t\t\t\t\tstruct offload_registers_access\n--\ndrivers/mmc/host/vub300.c-533-{\ndrivers/mmc/host/vub300.c:534:\tu8 r = vub300-\u003efn[func].offload_point + vub300-\u003efn[func].offload_count;\ndrivers/mmc/host/vub300.c:535:\tmemcpy(\u0026vub300-\u003efn[func].reg[MAXREGMASK \u0026 r], register_access,\ndrivers/mmc/host/vub300.c-536-\t sizeof(struct offload_registers_access));\ndrivers/mmc/host/vub300.c:537:\tvub300-\u003efn[func].offload_count += 1;\ndrivers/mmc/host/vub300.c:538:\tvub300-\u003etotal_offload_count += 1;\ndrivers/mmc/host/vub300.c-539-}\ndrivers/mmc/host/vub300.c-540-\ndrivers/mmc/host/vub300.c:541:static void add_offloaded_reg(struct vub300_mmc_host *vub300,\ndrivers/mmc/host/vub300.c-542-\t\t\t struct offload_registers_access *register_access)\n--\ndrivers/mmc/host/vub300.c-547-\tu8 func = ((0x70 \u0026 register_access-\u003ecommand_byte[0]) \u003e\u003e 4);\ndrivers/mmc/host/vub300.c:548:\tu8 regs = vub300-\u003edynamic_register_count;\ndrivers/mmc/host/vub300.c-549-\tu8 i = 0;\ndrivers/mmc/host/vub300.c:550:\twhile (0 \u003c regs-- \u0026\u0026 1 == vub300-\u003esdio_register[i].activate) {\ndrivers/mmc/host/vub300.c:551:\t\tif (vub300-\u003esdio_register[i].func_num == func \u0026\u0026\ndrivers/mmc/host/vub300.c:552:\t\t vub300-\u003esdio_register[i].sdio_reg == Register) {\ndrivers/mmc/host/vub300.c:553:\t\t\tif (vub300-\u003esdio_register[i].prepared == 0)\ndrivers/mmc/host/vub300.c:554:\t\t\t\tvub300-\u003esdio_register[i].prepared = 1;\ndrivers/mmc/host/vub300.c:555:\t\t\tvub300-\u003esdio_register[i].response =\ndrivers/mmc/host/vub300.c-556-\t\t\t\tregister_access-\u003eRespond_Byte[2];\ndrivers/mmc/host/vub300.c:557:\t\t\tvub300-\u003esdio_register[i].regvalue =\ndrivers/mmc/host/vub300.c-558-\t\t\t\tregister_access-\u003eRespond_Byte[3];\n--\ndrivers/mmc/host/vub300.c-564-\t}\ndrivers/mmc/host/vub300.c:565:\t__add_offloaded_reg_to_fifo(vub300, register_access, func);\ndrivers/mmc/host/vub300.c-566-}\ndrivers/mmc/host/vub300.c-567-\ndrivers/mmc/host/vub300.c:568:static void check_vub300_port_status(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-569-{\ndrivers/mmc/host/vub300.c-570-\t/*\ndrivers/mmc/host/vub300.c:571:\t * cmd_mutex is held by vub300_pollwork_thread,\ndrivers/mmc/host/vub300.c:572:\t * vub300_deadwork_thread or vub300_cmndwork_thread\ndrivers/mmc/host/vub300.c-573-\t */\n--\ndrivers/mmc/host/vub300.c-575-\tretval =\ndrivers/mmc/host/vub300.c:576:\t\tusb_control_msg(vub300-\u003eudev, usb_rcvctrlpipe(vub300-\u003eudev, 0),\ndrivers/mmc/host/vub300.c-577-\t\t\t\tGET_SYSTEM_PORT_STATUS,\ndrivers/mmc/host/vub300.c-578-\t\t\t\tUSB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,\ndrivers/mmc/host/vub300.c:579:\t\t\t\t0x0000, 0x0000, \u0026vub300-\u003esystem_port_status,\ndrivers/mmc/host/vub300.c:580:\t\t\t\tsizeof(vub300-\u003esystem_port_status), 1000);\ndrivers/mmc/host/vub300.c:581:\tif (sizeof(vub300-\u003esystem_port_status) == retval)\ndrivers/mmc/host/vub300.c:582:\t\tnew_system_port_status(vub300);\ndrivers/mmc/host/vub300.c-583-}\ndrivers/mmc/host/vub300.c-584-\ndrivers/mmc/host/vub300.c:585:static void __vub300_irqpoll_response(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-586-{\ndrivers/mmc/host/vub300.c:587:\t/* cmd_mutex is held by vub300_pollwork_thread */\ndrivers/mmc/host/vub300.c:588:\tif (vub300-\u003ecommand_res_urb-\u003eactual_length == 0)\ndrivers/mmc/host/vub300.c-589-\t\treturn;\ndrivers/mmc/host/vub300.c-590-\ndrivers/mmc/host/vub300.c:591:\tswitch (vub300-\u003eresp.common.header_type) {\ndrivers/mmc/host/vub300.c-592-\tcase RESPONSE_INTERRUPT:\ndrivers/mmc/host/vub300.c:593:\t\tmutex_lock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:594:\t\tif (vub300-\u003eirq_enabled)\ndrivers/mmc/host/vub300.c:595:\t\t\tmmc_signal_sdio_irq(vub300-\u003emmc);\ndrivers/mmc/host/vub300.c-596-\t\telse\ndrivers/mmc/host/vub300.c:597:\t\t\tvub300-\u003eirqs_queued += 1;\ndrivers/mmc/host/vub300.c:598:\t\tvub300-\u003eirq_disabled = 1;\ndrivers/mmc/host/vub300.c:599:\t\tmutex_unlock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c-600-\t\tbreak;\ndrivers/mmc/host/vub300.c-601-\tcase RESPONSE_ERROR:\ndrivers/mmc/host/vub300.c:602:\t\tif (vub300-\u003eresp.error.error_code == SD_ERROR_NO_DEVICE)\ndrivers/mmc/host/vub300.c:603:\t\t\tcheck_vub300_port_status(vub300);\ndrivers/mmc/host/vub300.c-604-\t\tbreak;\ndrivers/mmc/host/vub300.c-605-\tcase RESPONSE_STATUS:\ndrivers/mmc/host/vub300.c:606:\t\tvub300-\u003esystem_port_status = vub300-\u003eresp.status;\ndrivers/mmc/host/vub300.c:607:\t\tnew_system_port_status(vub300);\ndrivers/mmc/host/vub300.c:608:\t\tif (!vub300-\u003ecard_present)\ndrivers/mmc/host/vub300.c:609:\t\t\tvub300_queue_poll_work(vub300, HZ / 5);\ndrivers/mmc/host/vub300.c-610-\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-612-\t{\ndrivers/mmc/host/vub300.c:613:\t\tint offloaded_data_length = vub300-\u003eresp.common.header_size - 3;\ndrivers/mmc/host/vub300.c-614-\t\tint register_count = offloaded_data_length \u003e\u003e 3;\n--\ndrivers/mmc/host/vub300.c-616-\t\twhile (register_count--) {\ndrivers/mmc/host/vub300.c:617:\t\t\tadd_offloaded_reg(vub300, \u0026vub300-\u003eresp.irq.reg[ri]);\ndrivers/mmc/host/vub300.c-618-\t\t\tri += 1;\ndrivers/mmc/host/vub300.c-619-\t\t}\ndrivers/mmc/host/vub300.c:620:\t\tmutex_lock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:621:\t\tif (vub300-\u003eirq_enabled)\ndrivers/mmc/host/vub300.c:622:\t\t\tmmc_signal_sdio_irq(vub300-\u003emmc);\ndrivers/mmc/host/vub300.c-623-\t\telse\ndrivers/mmc/host/vub300.c:624:\t\t\tvub300-\u003eirqs_queued += 1;\ndrivers/mmc/host/vub300.c:625:\t\tvub300-\u003eirq_disabled = 1;\ndrivers/mmc/host/vub300.c:626:\t\tmutex_unlock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c-627-\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-630-\t{\ndrivers/mmc/host/vub300.c:631:\t\tint offloaded_data_length = vub300-\u003eresp.common.header_size - 3;\ndrivers/mmc/host/vub300.c-632-\t\tint register_count = offloaded_data_length \u003e\u003e 3;\n--\ndrivers/mmc/host/vub300.c-634-\t\twhile (register_count--) {\ndrivers/mmc/host/vub300.c:635:\t\t\tadd_offloaded_reg(vub300, \u0026vub300-\u003eresp.irq.reg[ri]);\ndrivers/mmc/host/vub300.c-636-\t\t\tri += 1;\ndrivers/mmc/host/vub300.c-637-\t\t}\ndrivers/mmc/host/vub300.c:638:\t\tmutex_lock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:639:\t\tif (vub300-\u003eirq_enabled)\ndrivers/mmc/host/vub300.c:640:\t\t\tmmc_signal_sdio_irq(vub300-\u003emmc);\ndrivers/mmc/host/vub300.c-641-\t\telse\ndrivers/mmc/host/vub300.c:642:\t\t\tvub300-\u003eirqs_queued += 1;\ndrivers/mmc/host/vub300.c:643:\t\tvub300-\u003eirq_disabled = 0;\ndrivers/mmc/host/vub300.c:644:\t\tmutex_unlock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c-645-\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-647-\tcase RESPONSE_NO_INTERRUPT:\ndrivers/mmc/host/vub300.c:648:\t\tvub300_queue_poll_work(vub300, 1);\ndrivers/mmc/host/vub300.c-649-\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-654-\ndrivers/mmc/host/vub300.c:655:static void __do_poll(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-656-{\ndrivers/mmc/host/vub300.c:657:\t/* cmd_mutex is held by vub300_pollwork_thread */\ndrivers/mmc/host/vub300.c-658-\tunsigned long commretval;\ndrivers/mmc/host/vub300.c:659:\tmod_timer(\u0026vub300-\u003einactivity_timer, jiffies + HZ);\ndrivers/mmc/host/vub300.c:660:\tinit_completion(\u0026vub300-\u003eirqpoll_complete);\ndrivers/mmc/host/vub300.c:661:\tsend_irqpoll(vub300);\ndrivers/mmc/host/vub300.c:662:\tcommretval = wait_for_completion_timeout(\u0026vub300-\u003eirqpoll_complete,\ndrivers/mmc/host/vub300.c-663-\t\t\t\t\t\t msecs_to_jiffies(500));\ndrivers/mmc/host/vub300.c:664:\tif (vub300-\u003eusb_transport_fail) {\ndrivers/mmc/host/vub300.c-665-\t\t/* no need to do anything */\ndrivers/mmc/host/vub300.c-666-\t} else if (commretval == 0) {\ndrivers/mmc/host/vub300.c:667:\t\tvub300-\u003eusb_timed_out = 1;\ndrivers/mmc/host/vub300.c:668:\t\tusb_kill_urb(vub300-\u003ecommand_out_urb);\ndrivers/mmc/host/vub300.c:669:\t\tusb_kill_urb(vub300-\u003ecommand_res_urb);\ndrivers/mmc/host/vub300.c-670-\t} else { /* commretval \u003e 0 */\ndrivers/mmc/host/vub300.c:671:\t\t__vub300_irqpoll_response(vub300);\ndrivers/mmc/host/vub300.c-672-\t}\n--\ndrivers/mmc/host/vub300.c-677- */\ndrivers/mmc/host/vub300.c:678:static void vub300_pollwork_thread(struct work_struct *work)\ndrivers/mmc/host/vub300.c-679-{\t\t\t\t/* NOT irq */\ndrivers/mmc/host/vub300.c:680:\tstruct vub300_mmc_host *vub300 = container_of(work,\ndrivers/mmc/host/vub300.c:681:\t\t\t struct vub300_mmc_host, pollwork.work);\ndrivers/mmc/host/vub300.c:682:\tif (!vub300-\u003einterface) {\ndrivers/mmc/host/vub300.c:683:\t\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-684-\t\treturn;\ndrivers/mmc/host/vub300.c-685-\t}\ndrivers/mmc/host/vub300.c:686:\tmutex_lock(\u0026vub300-\u003ecmd_mutex);\ndrivers/mmc/host/vub300.c:687:\tif (vub300-\u003ecmd) {\ndrivers/mmc/host/vub300.c:688:\t\tvub300_queue_poll_work(vub300, 1);\ndrivers/mmc/host/vub300.c:689:\t} else if (!vub300-\u003ecard_present) {\ndrivers/mmc/host/vub300.c-690-\t\t/* no need to do anything */\ndrivers/mmc/host/vub300.c:691:\t} else { /* vub300-\u003ecard_present */\ndrivers/mmc/host/vub300.c:692:\t\tmutex_lock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:693:\t\tif (!vub300-\u003eirq_enabled) {\ndrivers/mmc/host/vub300.c:694:\t\t\tmutex_unlock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:695:\t\t} else if (vub300-\u003eirqs_queued) {\ndrivers/mmc/host/vub300.c:696:\t\t\tvub300-\u003eirqs_queued -= 1;\ndrivers/mmc/host/vub300.c:697:\t\t\tmmc_signal_sdio_irq(vub300-\u003emmc);\ndrivers/mmc/host/vub300.c:698:\t\t\tmod_timer(\u0026vub300-\u003einactivity_timer, jiffies + HZ);\ndrivers/mmc/host/vub300.c:699:\t\t\tmutex_unlock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:700:\t\t} else { /* NOT vub300-\u003eirqs_queued */\ndrivers/mmc/host/vub300.c:701:\t\t\tmutex_unlock(\u0026vub300-\u003eirq_mutex);\ndrivers/mmc/host/vub300.c:702:\t\t\t__do_poll(vub300);\ndrivers/mmc/host/vub300.c-703-\t\t}\ndrivers/mmc/host/vub300.c-704-\t}\ndrivers/mmc/host/vub300.c:705:\tmutex_unlock(\u0026vub300-\u003ecmd_mutex);\ndrivers/mmc/host/vub300.c:706:\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-707-}\ndrivers/mmc/host/vub300.c-708-\ndrivers/mmc/host/vub300.c:709:static void vub300_deadwork_thread(struct work_struct *work)\ndrivers/mmc/host/vub300.c-710-{\t\t\t\t/* NOT irq */\ndrivers/mmc/host/vub300.c:711:\tstruct vub300_mmc_host *vub300 =\ndrivers/mmc/host/vub300.c:712:\t\tcontainer_of(work, struct vub300_mmc_host, deadwork);\ndrivers/mmc/host/vub300.c:713:\tif (!vub300-\u003einterface) {\ndrivers/mmc/host/vub300.c:714:\t\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-715-\t\treturn;\ndrivers/mmc/host/vub300.c-716-\t}\ndrivers/mmc/host/vub300.c:717:\tmutex_lock(\u0026vub300-\u003ecmd_mutex);\ndrivers/mmc/host/vub300.c:718:\tif (vub300-\u003ecmd) {\ndrivers/mmc/host/vub300.c-719-\t\t/*\n--\ndrivers/mmc/host/vub300.c-724-\t\t */\ndrivers/mmc/host/vub300.c:725:\t} else if (vub300-\u003ecard_present) {\ndrivers/mmc/host/vub300.c:726:\t\tcheck_vub300_port_status(vub300);\ndrivers/mmc/host/vub300.c:727:\t} else if (vub300-\u003emmc \u0026\u0026 vub300-\u003emmc-\u003ecard) {\ndrivers/mmc/host/vub300.c-728-\t\t/*\n--\ndrivers/mmc/host/vub300.c-734-\t} else {\ndrivers/mmc/host/vub300.c:735:\t\tcheck_vub300_port_status(vub300);\ndrivers/mmc/host/vub300.c-736-\t}\ndrivers/mmc/host/vub300.c:737:\tmod_timer(\u0026vub300-\u003einactivity_timer, jiffies + HZ);\ndrivers/mmc/host/vub300.c:738:\tmutex_unlock(\u0026vub300-\u003ecmd_mutex);\ndrivers/mmc/host/vub300.c:739:\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c-740-}\ndrivers/mmc/host/vub300.c-741-\ndrivers/mmc/host/vub300.c:742:static void vub300_inactivity_timer_expired(struct timer_list *t)\ndrivers/mmc/host/vub300.c-743-{\t\t\t\t/* softirq */\ndrivers/mmc/host/vub300.c:744:\tstruct vub300_mmc_host *vub300 = timer_container_of(vub300, t,\ndrivers/mmc/host/vub300.c-745-\t\t\t\t\t\t\t inactivity_timer);\ndrivers/mmc/host/vub300.c:746:\tif (!vub300-\u003einterface) {\ndrivers/mmc/host/vub300.c:747:\t\tkref_put(\u0026vub300-\u003ekref, vub300_delete);\ndrivers/mmc/host/vub300.c:748:\t} else if (vub300-\u003ecmd) {\ndrivers/mmc/host/vub300.c:749:\t\tmod_timer(\u0026vub300-\u003einactivity_timer, jiffies + HZ);\ndrivers/mmc/host/vub300.c-750-\t} else {\ndrivers/mmc/host/vub300.c:751:\t\tvub300_queue_dead_work(vub300);\ndrivers/mmc/host/vub300.c:752:\t\tmod_timer(\u0026vub300-\u003einactivity_timer, jiffies + HZ);\ndrivers/mmc/host/vub300.c-753-\t}\n--\ndrivers/mmc/host/vub300.c-755-\ndrivers/mmc/host/vub300.c:756:static int vub300_response_error(u8 error_code)\ndrivers/mmc/host/vub300.c-757-{\n--\ndrivers/mmc/host/vub300.c=792=static void command_res_completed(struct urb *urb)\ndrivers/mmc/host/vub300.c-793-{\t\t\t\t/* urb completion handler - hardirq */\ndrivers/mmc/host/vub300.c:794:\tstruct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb-\u003econtext;\ndrivers/mmc/host/vub300.c-795-\tif (urb-\u003estatus) {\ndrivers/mmc/host/vub300.c-796-\t\t/* we have to let the initiator handle the error */\ndrivers/mmc/host/vub300.c:797:\t} else if (vub300-\u003ecommand_res_urb-\u003eactual_length == 0) {\ndrivers/mmc/host/vub300.c-798-\t\t/*\n--\ndrivers/mmc/host/vub300.c-801-\t\t */\ndrivers/mmc/host/vub300.c:802:\t} else if (!vub300-\u003edata) {\ndrivers/mmc/host/vub300.c-803-\t\t/* this means that the command (typically CMD52) succeeded */\ndrivers/mmc/host/vub300.c:804:\t} else if (vub300-\u003eresp.common.header_type != 0x02) {\ndrivers/mmc/host/vub300.c-805-\t\t/*\n--\ndrivers/mmc/host/vub300.c-808-\t\t */\ndrivers/mmc/host/vub300.c:809:\t} else if (vub300-\u003eurb) {\ndrivers/mmc/host/vub300.c:810:\t\tvub300-\u003ecmd-\u003eerror =\ndrivers/mmc/host/vub300.c:811:\t\t\tvub300_response_error(vub300-\u003eresp.error.error_code);\ndrivers/mmc/host/vub300.c:812:\t\tusb_unlink_urb(vub300-\u003eurb);\ndrivers/mmc/host/vub300.c-813-\t} else {\ndrivers/mmc/host/vub300.c:814:\t\tvub300-\u003ecmd-\u003eerror =\ndrivers/mmc/host/vub300.c:815:\t\t\tvub300_response_error(vub300-\u003eresp.error.error_code);\ndrivers/mmc/host/vub300.c:816:\t\tusb_sg_cancel(\u0026vub300-\u003esg_request);\ndrivers/mmc/host/vub300.c-817-\t}\ndrivers/mmc/host/vub300.c:818:\tcomplete(\u0026vub300-\u003ecommand_complete);\t/* got_response_in */\ndrivers/mmc/host/vub300.c-819-}\n--\ndrivers/mmc/host/vub300.c=821=static void command_out_completed(struct urb *urb)\ndrivers/mmc/host/vub300.c-822-{\t\t\t\t/* urb completion handler - hardirq */\ndrivers/mmc/host/vub300.c:823:\tstruct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb-\u003econtext;\ndrivers/mmc/host/vub300.c-824-\tif (urb-\u003estatus) {\ndrivers/mmc/host/vub300.c:825:\t\tcomplete(\u0026vub300-\u003ecommand_complete);\ndrivers/mmc/host/vub300.c-826-\t} else {\n--\ndrivers/mmc/host/vub300.c-828-\t\tunsigned int pipe =\ndrivers/mmc/host/vub300.c:829:\t\t\tusb_rcvbulkpipe(vub300-\u003eudev, vub300-\u003ecmnd_res_ep);\ndrivers/mmc/host/vub300.c:830:\t\tusb_fill_bulk_urb(vub300-\u003ecommand_res_urb, vub300-\u003eudev, pipe,\ndrivers/mmc/host/vub300.c:831:\t\t\t\t \u0026vub300-\u003eresp, sizeof(vub300-\u003eresp),\ndrivers/mmc/host/vub300.c:832:\t\t\t\t command_res_completed, vub300);\ndrivers/mmc/host/vub300.c:833:\t\tvub300-\u003ecommand_res_urb-\u003eactual_length = 0;\ndrivers/mmc/host/vub300.c:834:\t\tret = usb_submit_urb(vub300-\u003ecommand_res_urb, GFP_ATOMIC);\ndrivers/mmc/host/vub300.c-835-\t\tif (ret == 0) {\n--\ndrivers/mmc/host/vub300.c-844-\t\t\t */\ndrivers/mmc/host/vub300.c:845:\t\t\tcomplete(\u0026vub300-\u003ecommand_complete);\ndrivers/mmc/host/vub300.c-846-\t\t}\n--\ndrivers/mmc/host/vub300.c-852- */\ndrivers/mmc/host/vub300.c:853:static void snoop_block_size_and_bus_width(struct vub300_mmc_host *vub300,\ndrivers/mmc/host/vub300.c-854-\t\t\t\t\t u32 cmd_arg)\n--\ndrivers/mmc/host/vub300.c-856-\tif ((0xFBFFFE00 \u0026 cmd_arg) == 0x80022200)\ndrivers/mmc/host/vub300.c:857:\t\tvub300-\u003efbs[1] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[1]);\ndrivers/mmc/host/vub300.c-858-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80022000)\ndrivers/mmc/host/vub300.c:859:\t\tvub300-\u003efbs[1] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[1]);\ndrivers/mmc/host/vub300.c-860-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80042200)\ndrivers/mmc/host/vub300.c:861:\t\tvub300-\u003efbs[2] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[2]);\ndrivers/mmc/host/vub300.c-862-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80042000)\ndrivers/mmc/host/vub300.c:863:\t\tvub300-\u003efbs[2] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[2]);\ndrivers/mmc/host/vub300.c-864-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80062200)\ndrivers/mmc/host/vub300.c:865:\t\tvub300-\u003efbs[3] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[3]);\ndrivers/mmc/host/vub300.c-866-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80062000)\ndrivers/mmc/host/vub300.c:867:\t\tvub300-\u003efbs[3] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[3]);\ndrivers/mmc/host/vub300.c-868-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80082200)\ndrivers/mmc/host/vub300.c:869:\t\tvub300-\u003efbs[4] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[4]);\ndrivers/mmc/host/vub300.c-870-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x80082000)\ndrivers/mmc/host/vub300.c:871:\t\tvub300-\u003efbs[4] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[4]);\ndrivers/mmc/host/vub300.c-872-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x800A2200)\ndrivers/mmc/host/vub300.c:873:\t\tvub300-\u003efbs[5] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[5]);\ndrivers/mmc/host/vub300.c-874-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x800A2000)\ndrivers/mmc/host/vub300.c:875:\t\tvub300-\u003efbs[5] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[5]);\ndrivers/mmc/host/vub300.c-876-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x800C2200)\ndrivers/mmc/host/vub300.c:877:\t\tvub300-\u003efbs[6] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[6]);\ndrivers/mmc/host/vub300.c-878-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x800C2000)\ndrivers/mmc/host/vub300.c:879:\t\tvub300-\u003efbs[6] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[6]);\ndrivers/mmc/host/vub300.c-880-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x800E2200)\ndrivers/mmc/host/vub300.c:881:\t\tvub300-\u003efbs[7] = (cmd_arg \u003c\u003c 8) | (0x00FF \u0026 vub300-\u003efbs[7]);\ndrivers/mmc/host/vub300.c-882-\telse if ((0xFBFFFE00 \u0026 cmd_arg) == 0x800E2000)\ndrivers/mmc/host/vub300.c:883:\t\tvub300-\u003efbs[7] = (0xFF \u0026 cmd_arg) | (0xFF00 \u0026 vub300-\u003efbs[7]);\ndrivers/mmc/host/vub300.c-884-\telse if ((0xFBFFFE03 \u0026 cmd_arg) == 0x80000E00)\ndrivers/mmc/host/vub300.c:885:\t\tvub300-\u003ebus_width = 1;\ndrivers/mmc/host/vub300.c-886-\telse if ((0xFBFFFE03 \u0026 cmd_arg) == 0x80000E02)\ndrivers/mmc/host/vub300.c:887:\t\tvub300-\u003ebus_width = 4;\ndrivers/mmc/host/vub300.c-888-}\ndrivers/mmc/host/vub300.c-889-\ndrivers/mmc/host/vub300.c:890:static void send_command(struct vub300_mmc_host *vub300)\ndrivers/mmc/host/vub300.c-891-{\ndrivers/mmc/host/vub300.c:892:\t/* cmd_mutex is held by vub300_cmndwork_thread */\ndrivers/mmc/host/vub300.c:893:\tstruct mmc_command *cmd = vub300-\u003ecmd;\ndrivers/mmc/host/vub300.c:894:\tstruct mmc_data *data = vub300-\u003edata;\ndrivers/mmc/host/vub300.c-895-\tint retval;\n--\ndrivers/mmc/host/vub300.c-897-\tu8 response_type;\ndrivers/mmc/host/vub300.c:898:\tif (vub300-\u003eapp_spec) {\ndrivers/mmc/host/vub300.c-899-\t\tswitch (cmd-\u003eopcode) {\n--\ndrivers/mmc/host/vub300.c-901-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:902:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-903-\t\t\tif (0x00000000 == (0x00000003 \u0026 cmd-\u003earg))\ndrivers/mmc/host/vub300.c:904:\t\t\t\tvub300-\u003ebus_width = 1;\ndrivers/mmc/host/vub300.c-905-\t\t\telse if (0x00000002 == (0x00000003 \u0026 cmd-\u003earg))\ndrivers/mmc/host/vub300.c:906:\t\t\t\tvub300-\u003ebus_width = 4;\ndrivers/mmc/host/vub300.c-907-\t\t\telse\ndrivers/mmc/host/vub300.c:908:\t\t\t\tdev_err(\u0026vub300-\u003eudev-\u003edev,\ndrivers/mmc/host/vub300.c-909-\t\t\t\t\t\"unexpected ACMD6 bus_width=%d\\n\",\n--\ndrivers/mmc/host/vub300.c-913-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:914:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-915-\t\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-917-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:918:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-919-\t\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-921-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:922:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-923-\t\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-925-\t\t\tresponse_type = SDRT_3;\ndrivers/mmc/host/vub300.c:926:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-927-\t\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-929-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:930:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-931-\t\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-933-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:934:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-935-\t\t\tbreak;\n--\ndrivers/mmc/host/vub300.c-937-\t\t\tresponse_type = SDRT_1;\ndrivers/mmc/host/vub300.c:938:\t\t\tvub300-\u003eresp_len = 6;\ndrivers/mmc/host/vub300.c-939-\t\t\tbreak;\ndrivers/mmc/host/vub300.c-940-\t\tdefault:\ndrivers/mmc/host/vub300.c:941:\t\t\tvub300-\u003eresp_len = 0;\ndrivers/mmc/host/vub300.c-942-\t\t\tcmd-\u003eerror = -EINVAL;\ndrivers/mmc/host/vub300.c:943:\t\t\tcomplete(\u0026vub300-\u003ecommand_complete);\n\n"
} |
| 15/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 22842 output: 48 thoughts: 209 Thoughts: **SDIO Card Discovery via USB Fuzzing with syzkaller** Okay, so the potential here is pretty interesting. I'm thinking, if syzkaller can reach `vub300` through USB fuzzing, and then `vub300` acts as an MMC host, we might be able to trigger something interesting. The key is, if `vub300` is the MMC host, it could enumerate an SDIO card – *if* the emulated USB device from syzkaller responds correctly to the MMC/SDIO commands. Ah, right, `vub300` is the USB-to-SDIO bridge. It basically translates MMC commands over USB and relays the responses. This means if syzkaller is emulating the USB device of `vub300`, it has the potential to provide all the responses needed for SDIO enumeration. If we can spoof those SDIO enumeration responses from the fuzzer, the MMC core should detect an SDIO card and bind an SDIO driver to it. Now, the next question is, which SDIO driver might be available? Is `brcmfmac` one? Yeah, that rings a bell – `brcmfmac` is an SDIO driver! So that seems like a good target. Now, I need to check if we can actually probe the `brcmfmac` SDIO driver this way. It's a plausible path for a fuzzing target, so let's verify if that's even possible. |
| 16/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "sdio_register_driver",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=1257=int brcmf_sdio_register(void)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1258-{\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:1259:\treturn sdio_register_driver(\u0026brcmf_sdmmc_driver);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1260-}\n"
} |
| 17/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 23602 output: 51 thoughts: 20 Thoughts: Okay, let's dive into this. Here's my thought process on what I'm looking at: **Investigating Device IDs Matched by brcmf_sdmmc_driver** Alright, time to get to the core of what's happening. My primary concern right now is understanding which specific device IDs are associated with the `brcmf_sdmmc_driver`. I need to figure out which hardware this driver is intended to support. Knowing the device IDs will give me crucial insight into its intended scope, and whether it's the correct driver for a given piece of hardware. I want to build a clear picture of its role in the broader system and how it interfaces with the hardware. |
| 18/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "brcmf_sdmmc_driver",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=1242=static DEFINE_SIMPLE_DEV_PM_OPS(brcmf_sdio_pm_ops,\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1245-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:1246:static struct sdio_driver brcmf_sdmmc_driver = {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1247-\t.probe = brcmf_ops_sdio_probe,\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=1257=int brcmf_sdio_register(void)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1258-{\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:1259:\treturn sdio_register_driver(\u0026brcmf_sdmmc_driver);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1260-}\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=1262=void brcmf_sdio_exit(void)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1265-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:1266:\tsdio_unregister_driver(\u0026brcmf_sdmmc_driver);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1267-}\n"
} |
| 19/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24366 output: 56 thoughts: 22 Thoughts: Here's my thought process, as requested: **Checking the `id_table`** Okay, let's dive in. My first instinct, whenever I'm dealing with a driver module, especially one dealing with something like SDMMC, is to look at its `id_table`. I need to figure out how this `brcmf_sdmmc_driver` is actually *identified* by the system. What are the vendor IDs, device IDs, maybe even subclass codes, that it claims to support? The `id_table` is the crucial data structure that tells me the specific hardware it's designed to work with, what it's claimed to be capable of interfacing with, and its primary purpose. That's always my starting point. Understanding that table will guide any further investigation and help me understand what hardware the driver is meant to attach itself to. |
| 20/2 | 2026/07/23 10:37 | tool | read-file |
0mArgs:{
"File": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c",
"FirstLine": 1240,
"LineCount": 20
}Results: {
"Contents": "1240:\t}\n1241:\t\n1242:\tstatic DEFINE_SIMPLE_DEV_PM_OPS(brcmf_sdio_pm_ops,\n1243:\t\t\t\t\tbrcmf_ops_sdio_suspend,\n1244:\t\t\t\t\tbrcmf_ops_sdio_resume);\n1245:\t\n1246:\tstatic struct sdio_driver brcmf_sdmmc_driver = {\n1247:\t\t.probe = brcmf_ops_sdio_probe,\n1248:\t\t.remove = brcmf_ops_sdio_remove,\n1249:\t\t.name = KBUILD_MODNAME,\n1250:\t\t.id_table = brcmf_sdmmc_ids,\n1251:\t\t.drv = {\n1252:\t\t\t.pm = pm_sleep_ptr(\u0026brcmf_sdio_pm_ops),\n1253:\t\t\t.coredump = brcmf_dev_coredump,\n1254:\t\t},\n1255:\t};\n1256:\t\n1257:\tint brcmf_sdio_register(void)\n1258:\t{\n1259:\t\treturn sdio_register_driver(\u0026brcmf_sdmmc_driver);\n"
} |
| 21/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24966 output: 56 thoughts: 15 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Initial Diagnostic Scan** Alright, the initial prompt points me to a potentially critical area. My first thought is: "Let's get right down to it, let's scrutinize `brcmf_sdmmc_ids`." This probably means something's gone awry, and my experience with Broadcom's WiFi driver, especially concerning SDIO/MMC interfaces, immediately puts `brcmf_sdmmc_ids` in the spotlight. I'm likely thinking about device ID probing, board configuration, or possibly even power sequencing related to the SD/MMC interface, given that function's context. I need to figure out what's gone wrong here and start my deep dive. Let's see if this points to an obvious issue. |
| 22/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "brcmf_sdmmc_ids",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=900=int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-978-/* devices we support, null terminated */\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:979:static const struct sdio_device_id brcmf_sdmmc_ids[] = {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-980-\tBRCMF_SDIO_DEVICE(SDIO_DEVICE_ID_BROADCOM_43143, WCC),\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1005-};\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:1006:MODULE_DEVICE_TABLE(sdio, brcmf_sdmmc_ids);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1007-\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=1246=static struct sdio_driver brcmf_sdmmc_driver = {\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1249-\t.name = KBUILD_MODNAME,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:1250:\t.id_table = brcmf_sdmmc_ids,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-1251-\t.drv = {\n"
} |
| 23/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25765 output: 42 thoughts: 258 Thoughts: **SDIO Fuzzing with Syzkaller: A Hypothesis** Okay, so `brcmfmac` is an SDIO driver, and I need to figure out if I can fuzz it with Syzkaller. My initial thought is to see if Syzkaller even supports SDIO directly. I know it has descriptions for USB connections, like `syz_usb_connect` and `syz_usb_connect_ath9k`. But does it have the equivalent for SDIO? I can't directly query Syzkaller for a list of SDIO descriptions. However, since Syzkaller has `syz_usb_connect`, which can emulate any USB device, maybe there's a workaround. If I can get Syzkaller to emulate something like `vub300`, I *could* get SDIO responses. The key is in the USB descriptors. Does Syzkaller actually do this emulating of `vub300`? I need to dig deeper. If Syzkaller's `syz_usb_connect` takes a USB device descriptor, then if the fuzzer generates a descriptor that matches `vub300`'s attributes (Vendor ID 0x012C, Product ID 0x012C, or whatever the `vub300_table` defines), then the `vub300` driver should bind to it. This sounds promising. I need to confirm this. I'll check `vub300_table` in `drivers/mmc/host/vub300.c` to see if my hypothesis is correct. |
| 24/2 | 2026/07/23 10:37 | tool | read-file |
0mArgs:{
"File": "drivers/mmc/host/vub300.c",
"FirstLine": 260,
"LineCount": 20
}Results: {
"Contents": " 260:\tMODULE_PARM_DESC(firmware_rom_wait_states,\n 261:\t\t\t \"ROM wait states byte=RRRIIEEE (Reserved Internal External)\");\n 262:\t\n 263:\t#define ELAN_VENDOR_ID\t\t0x2201\n 264:\t#define VUB300_VENDOR_ID\t0x0424\n 265:\t#define VUB300_PRODUCT_ID\t0x012C\n 266:\tstatic const struct usb_device_id vub300_table[] = {\n 267:\t\t{USB_DEVICE(ELAN_VENDOR_ID, VUB300_PRODUCT_ID)},\n 268:\t\t{USB_DEVICE(VUB300_VENDOR_ID, VUB300_PRODUCT_ID)},\n 269:\t\t{} /* Terminating entry */\n 270:\t};\n 271:\tMODULE_DEVICE_TABLE(usb, vub300_table);\n 272:\t\n 273:\tstatic struct workqueue_struct *cmndworkqueue;\n 274:\tstatic struct workqueue_struct *pollworkqueue;\n 275:\tstatic struct workqueue_struct *deadworkqueue;\n 276:\t\n 277:\tstatic inline int interface_to_InterfaceNumber(struct usb_interface *interface)\n 278:\t{\n 279:\t\tif (!interface)\n"
} |
| 25/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26796 output: 52 thoughts: 167 Thoughts: **My Initial Assessment of the `vub300` Vulnerability** Okay, so `vub300` binds to both `0x2201:0x012C` and `0x0424:0x012C`. That's good information, and Syzkaller can emulate this device, which means I can start fuzzing pretty easily. My plan is to emulate `vub300`, have it send USB commands to the fuzzer, and respond with SDIO responses. The interesting part here is that if I can get the fuzzer to craft the SDIO responses to match the `brcmfmac` SDIO device IDs, I can get `brcmfmac` to actually bind to my emulated device. Wait a second, didn't `brcmfmac` have a USB driver as well? Let me quickly cross-reference that by checking `drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c`. This might be a more promising attack surface than I initially thought. |
| 26/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "brcmf_usb_probe",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c=1165=static const struct brcmf_bus_ops brcmf_usb_bus_ops = {\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1175-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1176:static void brcmf_usb_probe_phase2(struct device *dev, int ret,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1177-\t\t\t\t struct brcmf_fw_request *fwreq)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c=1224=brcmf_usb_prepare_fw_request(struct brcmf_usbdev_info *devinfo)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1243-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1244:static int brcmf_usb_probe_cb(struct brcmf_usbdev_info *devinfo,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1245-\t\t\t enum brcmf_fwvendor fwvid)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1307-\t/* request firmware here */\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1308:\tret = brcmf_fw_get_firmwares(dev, fwreq, brcmf_usb_probe_phase2);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1309-\tif (ret) {\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c=1341=static int\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1342:brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1343-{\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1442-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1443:\tret = brcmf_usb_probe_cb(devinfo, id-\u003edriver_info);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1444-\tif (ret)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c=1511=static int brcmf_usb_reset_resume(struct usb_interface *intf)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1523-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1524:\tret = brcmf_fw_get_firmwares(\u0026usb-\u003edev, fwreq, brcmf_usb_probe_phase2);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1525-\tif (ret \u003c 0)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c=1565=static struct usb_driver brcmf_usbdrvr = {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1566-\t.name = KBUILD_MODNAME,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c:1567:\t.probe = brcmf_usb_probe,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c-1568-\t.disconnect = brcmf_usb_disconnect,\n"
} |
| 27/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 28406 output: 47 thoughts: 55 Thoughts: **Investigating the `brcmfmac` Driver Architecture** Okay, so I'm digging into this `brcmfmac` driver, and it looks like there's a USB driver component, which is good. But then I see this patch related to it is in `sdio.c`, which feels a bit... off. My initial thought is, is `sdio.c` actually being leveraged by the USB implementation? That's the crucial question here. I need to figure out if that particular source file, `sdio.c`, is even compiled into the USB version of the driver. I need to quickly determine the build configuration to trace how they relate. This seems like it could either be a straightforward integration or a potential area for subtle bugs, depending on how these modules interact. |
| 28/2 | 2026/07/23 10:37 | tool | grepper |
0mArgs:{
"Expression": "sdio\\.o",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Makefile"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Makefile=36=brcmfmac-$(CONFIG_BRCMFMAC_SDIO) += \\\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Makefile:37:\t\tsdio.o \\\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Makefile-38-\t\tbcmsdh.o\n"
} |
| 29/2 | 2026/07/23 10:37 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 28801 output: 56 thoughts: 453 Thoughts: **Reaching brcmf_sdio_read_control with Syzkaller** Okay, so I'm trying to figure out if this `brcmf_sdio_read_control` function is actually reachable by Syzkaller. It's in `sdio.c`, which I know is only compiled if `CONFIG_BRCMFMAC_SDIO` is enabled. That's a key point. The `brcmfmac` USB driver uses `usb.c`, so any changes here are specifically for the SDIO interface. My question is, can Syzkaller fuzz *this* interface? Right, I've thought this through before. Syzkaller can emulate a `vub300` USB device, which acts as an SDIO host. The question is, does it *actually* do this? I know `syz_usb_connect` is a thing and that it can emulate any USB device. If Syzkaller crafts a USB device that looks like a `vub300`, the `vub300` driver *should* probe it. Then, the `vub300` driver will send commands to the USB device to enumerate SDIO cards. If Syzkaller responds correctly to those commands, it should be able to enumerate a `brcmfmac` SDIO card. But is that reachable in practice? Okay, the prompt says to verify if it can be executed. Now, I recall that Syzkaller *has* found bugs in `brcmfmac` SDIO before. Wait, the commit message says "syz-cluster: applied patch under review". This *strongly* implies Syzkaller found a bug here. Or at least it's testing a patch for a bug here. If Syzkaller *found* a bug, it's *definitely* reachable. Let me see. I can't check the bug reports directly. But the fact that a patch is being tested by Syzkaller suggests it's likely reachable. Okay, the prompt says to confirm whether it is reachable. We know it's in `sdio.c`, which is the SDIO driver for `brcmfmac`. Now, the crucial step is to verify that `brcmf_sdio_read_control` *can* be executed. I need to figure out where `brcmf_sdio_read_control` is called, and that will give me my answer. |
| 30/2 | 2026/07/23 10:38 | tool | grepper |
0mArgs:{
"Expression": "brcmf_sdio_read_control",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=1756=static void\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:1757:brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1758-{\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=1859=static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1919-\t\t\tif (rd-\u003echannel == SDPCM_CONTROL_CHANNEL) {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:1920:\t\t\t\tbrcmf_sdio_read_control(bus, bus-\u003erxhdr,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1921-\t\t\t\t\t\t\trd-\u003elen,\n"
} |
| 31/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30182 output: 55 thoughts: 36 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Analyzing the Call Stack: `brcmf_sdio_readframes`** Right, let's dive in. The starting point is `brcmf_sdio_readframes`, and my immediate thought is to trace the call hierarchy. To truly understand its behavior and potential issues, I need to know where this function is being invoked. I'm going to quickly identify all the call sites of `brcmf_sdio_readframes`. This is standard debugging procedure; contextual information will be essential in diagnosing any observed issues. Understanding the entry point will inform my diagnostic approach. |
| 32/2 | 2026/07/23 10:38 | tool | grepper |
0mArgs:{
"Expression": "brcmf_sdio_readframes",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=1847=static void brcmf_sdio_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1858-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:1859:static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-1860-{\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=2587=static void brcmf_sdio_dpc(struct brcmf_sdio *bus)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-2691-\tif ((intstatus \u0026 I_HMB_FRAME_IND) \u0026\u0026 (bus-\u003eclkstate == CLK_AVAIL)) {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:2692:\t\tbrcmf_sdio_readframes(bus, bus-\u003erxbound);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-2693-\t\tif (!bus-\u003erxpending)\n"
} |
| 33/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30834 output: 55 thoughts: 36 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Investigating the `brcmf_sdio_dpc` Call Path** Alright, I'm diving into this. The starting point is `brcmf_sdio_dpc`, and my initial focus is to trace its invocation. I need to understand the function's context. Where is this Deferred Procedure Call (DPC) being triggered from? Knowing the calling function provides critical context – is it an interrupt handler, a tasklet, or something else entirely? Understanding the call stack is paramount to grasping the function's purpose and potential issues. Let's trace back and map out the control flow to fully grasp the execution path. |
| 34/2 | 2026/07/23 10:38 | tool | grepper |
0mArgs:{
"Expression": "brcmf_sdio_dpc",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=2560=static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-2586-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:2587:static void brcmf_sdio_dpc(struct brcmf_sdio *bus)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-2588-{\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c=3759=static void brcmf_sdio_dataworker(struct work_struct *work)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-3767-\t\tbus-\u003edpc_triggered = false;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:3768:\t\tbrcmf_sdio_dpc(bus);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c-3769-\t\tbus-\u003eidlecount = 0;\n"
} |
| 35/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31461 output: 52 thoughts: 212 Thoughts: **Analyzing the Trigger Path for `brcmf_sdio_dataworker` Vulnerability** Okay, so I'm looking at this function, `brcmf_sdio_dataworker`. The call stack tells me it's reached from `brcmf_sdio_dataworker`, which means it's a workqueue function. That's key. It's triggered when the device is initialized and we're receiving interrupts or data. The interesting part is how this can be exploited. Syzkaller is the obvious avenue here, because of its ability to emulate devices through USB using vub300 to SDIO. This gives me a clear path to trigger this function. Hold on, I had a brief thought about `mac80211_hwsim`, but quickly dismissed it. It's a completely different driver and doesn't apply here. Hmm, are there any *other* SDIO emulation options in the kernel that I'm missing? I don't think so. `vub300` seems to be the only one, which reinforces the initial hunch about Syzkaller. Now, the crucial question is whether `vub300` is actually enabled in the Syzkaller configurations. I need to make sure `CONFIG_MMC_VUB300` is enabled. I don't have the config file directly at hand, but I should at least be able to see it listed under `EnableConfigs`. Also, `CONFIG_BRCMFMAC_SDIO` *must* be enabled as well, or this whole investigation is moot. Let's double-check the precise configuration names just to be certain. |
| 36/2 | 2026/07/23 10:38 | tool | grepper |
0mArgs:{
"Expression": "config BRCMFMAC_SDIO",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig=14=config BRCMFMAC_PROTO_MSGBUF\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-16-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:17:config BRCMFMAC_SDIO\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-18-\tbool \"SDIO bus interface support for FullMAC driver\"\n"
} |
| 37/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32241 output: 37 thoughts: 22 Thoughts: Here's a summary of my thought process, as requested: **Assessing Driver Compatibility** Okay, so I'm looking at compatibility, specifically whether certain drivers are relevant. The first thing that pops into my head is `BRCMFMAC_SDIO`. Yep, that's definitely a consideration. And then, following that line of thought, `MMC_VUB300` comes to mind. I'm immediately trying to connect these pieces, considering the system architecture and how these drivers might interact. It’s about understanding if these are on the correct path to resolve the problem. |
| 38/2 | 2026/07/23 10:38 | tool | grepper |
0mArgs:{
"Expression": "config MMC_VUB300",
"PathPrefix": "drivers/mmc/host/Kconfig"
}Results: {
"Output": "drivers/mmc/host/Kconfig=910=config MMC_JZ4740\n--\ndrivers/mmc/host/Kconfig-919-\ndrivers/mmc/host/Kconfig:920:config MMC_VUB300\ndrivers/mmc/host/Kconfig-921-\ttristate \"VUB300 USB to SDIO/SD/MMC Host Controller support\"\n"
} |
| 39/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32538 output: 55 thoughts: 146 Thoughts: **Analyzing the Patch for Configuration Updates** Okay, so the primary target here is `MMC_VUB300`, got it. That means I definitely need to include both `BRCMFMAC_SDIO` and `MMC_VUB300` within `EnableConfigs`. That's the baseline. Now, let's consider `FocusSymbols`. The patch focuses on modifying `brcmf_sdio_read_control`. Therefore, I need to list `brcmf_sdio_read_control` there as well. It's always good practice to double-check. Let me confirm that `brcmf_sdio_read_control` is indeed a static function, and yes, it is. Excellent. Alright, is there anything else touched by this patch? A quick review shows no, just `brcmf_sdio_read_control`. Time to give the patch a final, careful once-over to ensure I haven't missed anything. |
| 40/2 | 2026/07/23 10:38 | tool | read-file |
0mArgs:{
"File": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c",
"FirstLine": 1790,
"LineCount": 35
}Results: {
"Contents": "1790:\t\t/* Drop if the read is too big or it exceeds our maximum */\n1791:\t\tif ((rdlen + BRCMF_FIRSTREAD) \u003e bus-\u003esdiodev-\u003ebus_if-\u003emaxctl) {\n1792:\t\t\tbrcmf_err(\"%d-byte control read exceeds %d-byte buffer\\n\",\n1793:\t\t\t\t rdlen, bus-\u003esdiodev-\u003ebus_if-\u003emaxctl);\n1794:\t\t\tbrcmf_sdio_rxfail(bus, false, false);\n1795:\t\t\tvfree(buf);\n1796:\t\t\tgoto done;\n1797:\t\t}\n1798:\t\n1799:\t\tif ((len - doff) \u003e bus-\u003esdiodev-\u003ebus_if-\u003emaxctl) {\n1800:\t\t\tbrcmf_err(\"%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\\n\",\n1801:\t\t\t\t len, len - doff, bus-\u003esdiodev-\u003ebus_if-\u003emaxctl);\n1802:\t\t\tbus-\u003esdcnt.rx_toolong++;\n1803:\t\t\tbrcmf_sdio_rxfail(bus, false, false);\n1804:\t\t\tvfree(buf);\n1805:\t\t\tgoto done;\n1806:\t\t}\n1807:\t\n1808:\t\t/* Read remain of frame body */\n1809:\t\tsdret = brcmf_sdiod_recv_buf(bus-\u003esdiodev, rbuf, rdlen);\n1810:\t\tbus-\u003esdcnt.f2rxdata++;\n1811:\t\n1812:\t\t/* Control frame failures need retransmission */\n1813:\t\tif (sdret \u003c 0) {\n1814:\t\t\tbrcmf_err(\"read %d control bytes failed: %d\\n\",\n1815:\t\t\t\t rdlen, sdret);\n1816:\t\t\tbus-\u003esdcnt.rxc_errors++;\n1817:\t\t\tbrcmf_sdio_rxfail(bus, true, true);\n1818:\t\t\tvfree(buf);\n1819:\t\t\tgoto done;\n1820:\t\t} else\n1821:\t\t\tmemcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);\n1822:\t\n1823:\tgotpkt:\n1824:\t\n"
} |
| 41/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 33567 output: 49 thoughts: 267 Thoughts: **My Fuzzing Strategy: A Memory Leak Fix in Broadcom SDIO** Okay, so this patch is important. It adds `vfree(buf)` in a few error paths, which clearly indicates a functional change and, more importantly, fixes a memory leak. That instantly makes it interesting from a fuzzing perspective. The key is that this leak occurs within `brcmf_sdio_read_control`, part of the Broadcom FullMAC SDIO driver. Now, the critical question is *reachability*. I need to determine if this code is actually accessible. Luckily, the text indicates that it *is* reachable through SDIO emulation, specifically via USB fuzzing using the `vub300` USB-to-SDIO bridge driver. This is a great starting point for virtualized testing environments. Let's break this down further for fuzzing: * **WorthFuzzing: True.** Absolutely. A memory leak fix is a prime target. * **Reasoning:** The patch addresses a memory leak in the error handling of a core SDIO function. It is reachable via a USB-to-SDIO bridge emulation driver, allowing fuzzing in a virtualized setting. * **FocusSymbols:** This will be `brcmf_sdio_read_control`. This is the primary function to focus our fuzzing efforts on. * **EnableConfigs:** I'll need to make sure that `BRCMFMAC_SDIO` and `MMC_VUB300` are enabled during compilation. It's probably worth noting that `BRCMFMAC_SDIO` *depends* on `BRCMFMAC`, which means that it, and by extension, `BRCMFMAC` itself, need to be enabled for this code to be compiled. I will likely include `BRCMFMAC` as well. |
| 42/2 | 2026/07/23 10:38 | tool | grepper |
0mArgs:{
"Expression": "config BRCMFMAC",
"PathPrefix": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig"
}Results: {
"Output": "drivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:1:config BRCMFMAC\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-2-\ttristate \"Broadcom FullMAC WLAN driver\"\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-10-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:11:config BRCMFMAC_PROTO_BCDC\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-12-\tbool\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-13-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:14:config BRCMFMAC_PROTO_MSGBUF\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-15-\tbool\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-16-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:17:config BRCMFMAC_SDIO\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-18-\tbool \"SDIO bus interface support for FullMAC driver\"\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-28-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:29:config BRCMFMAC_USB\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-30-\tbool \"USB bus interface support for FullMAC driver\"\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-39-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig:40:config BRCMFMAC_PCIE\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/Kconfig-41-\tbool \"PCIE bus interface support for FullMAC driver\"\n"
} |
| 43/2 | 2026/07/23 10:38 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 34890 output: 146 thoughts: 126 Thoughts: **Focusing on a Specific Function** Okay, let's nail down our target function. I've got a few candidates to start with: `BRCMFMAC`, `BRCMFMAC_SDIO`, and `MMC_VUB300`. But before I commit to any of those, I need to make sure I'm not overlooking something critical. So, let's scan for other potential functions that warrant a deeper look. Right, after that quick check, `brcmf_sdio_read_control` is the only function that's been modified, from the list I've been given. Hmm, is this a performance-sensitive area? I need to consider whether it's on a critical path. `brcmf_sdio_read_control` is called when reading control frames, and while control frames aren't as prevalent as data frames, they can still be pretty frequent, depending on the implementation. The nice thing is, it is the exact function that has been changed, which makes it the obvious choice. Alright, I'm comfortable with that, so I'll set the results. |
| 44/2 | 2026/07/23 10:38 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"BRCMFMAC",
"BRCMFMAC_SDIO",
"MMC_VUB300"
],
"FocusSymbols": [
"brcmf_sdio_read_control"
],
"Reasoning": "The patch fixes a memory leak in the error paths of `brcmf_sdio_read_control` within the Broadcom FullMAC SDIO driver. This code is reachable in virtualized environments via USB fuzzing using the `vub300` USB-to-SDIO bridge driver, which allows emulating SDIO devices and triggering SDIO driver paths.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"BRCMFMAC",
"BRCMFMAC_SDIO",
"MMC_VUB300"
],
"FocusSymbols": [
"brcmf_sdio_read_control"
],
"Reasoning": "The patch fixes a memory leak in the error paths of `brcmf_sdio_read_control` within the Broadcom FullMAC SDIO driver. This code is reachable in virtualized environments via USB fuzzing using the `vub300` USB-to-SDIO bridge driver, which allows emulating SDIO devices and triggering SDIO driver paths.",
"WorthFuzzing": true
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
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| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
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