| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/27 19:22 | flow | patch-triage |
3mArgs:null Results: {
"EnableConfigs": [
"IO_URING",
"BLK_DEV_UBLK",
"NVME_CORE",
"BLK_DEV_NVME",
"BLK_DEV_BSG",
"BTRFS_FS",
"FUSE_FS"
],
"FocusSymbols": [
"io_uring_cmd_set_res",
"io_uring_cmd_set_res32",
"io_uring_cmd_done"
],
"KMSANReasoning": "The patch refactors the `io_uring_cmd_done` API by splitting it into `io_uring_cmd_set_res`/`io_uring_cmd_set_res32` and `io_uring_cmd_done`. The values passed to these functions remain the same as before, and all fields in the completion queue entry (CQE) are explicitly initialized (e.g., `extra2` is set to 0 in `io_req_set_res32`). There are no new structures sent to user space, no changes to bounds checking, and no uninitialized memory risks introduced by this patch. Any potential bugs would be logic errors or use-after-free/out-of-bounds issues, which are adequately covered by KASAN and other standard bug detectors.",
"NeedsKMSAN": false,
"Reasoning": "The patch modifies the core io_uring command API by splitting `io_uring_cmd_done` into `io_uring_cmd_set_res` (or `io_uring_cmd_set_res32`) and `io_uring_cmd_done`. This affects how results are returned for io_uring commands across multiple subsystems including block, ublk, nvme, scsi bsg, btrfs, and fuse. This is a functional change in the core kernel API and its callers, which is worth fuzzing to ensure no regressions or incorrect result handling are introduced.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/27 19:22 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 35f6c1cd5bc9f79d77c85f6b1f68ac3f6f1aa2c3\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Aug 27 19:22:33 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/block/ioctl.c b/block/ioctl.c\nindex 64b4e6c0f6965..946cab74f253e 100644\n--- a/block/ioctl.c\n+++ b/block/ioctl.c\n@@ -871,9 +871,10 @@ static void blk_cmd_complete(struct io_tw_req tw_req, io_tw_token_t tw)\n \n \tif (bic-\u003eres == -EAGAIN \u0026\u0026 bic-\u003enowait)\n \t\tio_uring_cmd_issue_blocking(cmd);\n-\telse\n-\t\tio_uring_cmd_done(cmd, bic-\u003eres,\n-\t\t\t\t IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n+\telse {\n+\t\tio_uring_cmd_set_res(cmd, bic-\u003eres);\n+\t\tio_uring_cmd_done(cmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n+\t}\n }\n \n static void bio_cmd_bio_end_io(struct bio *bio)\ndiff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c\nindex 4d17ed264da1a..51f15e5b3c01d 100644\n--- a/drivers/block/ublk_drv.c\n+++ b/drivers/block/ublk_drv.c\n@@ -839,7 +839,8 @@ static void ublk_batch_deinit_fetch_buf(struct ublk_queue *ubq,\n \t__ublk_release_fcmd(ubq);\n \tspin_unlock(\u0026ubq-\u003eevts_lock);\n \n-\tio_uring_cmd_done(fcmd-\u003ecmd, res, data-\u003eissue_flags);\n+\tio_uring_cmd_set_res(fcmd-\u003ecmd, res);\n+\tio_uring_cmd_done(fcmd-\u003ecmd, data-\u003eissue_flags);\n \tublk_batch_free_fcmd(fcmd);\n }\n \n@@ -1642,7 +1643,8 @@ static void ublk_complete_io_cmd(struct ublk_io *io, struct request *req,\n \tstruct io_uring_cmd *cmd = __ublk_prep_compl_io_cmd(io, req);\n \n \t/* tell ublksrv one io request is coming */\n-\tio_uring_cmd_done(cmd, res, issue_flags);\n+\tio_uring_cmd_set_res(cmd, res);\n+\tio_uring_cmd_done(cmd, issue_flags);\n }\n \n #define UBLK_REQUEUE_DELAY_MS\t3\n@@ -1728,7 +1730,8 @@ static void ublk_auto_buf_dispatch(const struct ublk_queue *ubq,\n \n \tif (res != AUTO_BUF_REG_FAIL) {\n \t\tublk_auto_buf_io_setup(ubq, req, io, cmd, res);\n-\t\tio_uring_cmd_done(cmd, UBLK_IO_RES_OK, issue_flags);\n+\t\tio_uring_cmd_set_res(cmd, UBLK_IO_RES_OK);\n+\t\tio_uring_cmd_done(cmd, issue_flags);\n \t}\n }\n \n@@ -2789,8 +2792,10 @@ static void ublk_cancel_cmd(struct ublk_queue *ubq, u16 tag,\n \t}\n \tspin_unlock(\u0026ubq-\u003ecancel_lock);\n \n-\tif (!done \u0026\u0026 cmd)\n-\t\tio_uring_cmd_done(cmd, UBLK_IO_RES_ABORT, issue_flags);\n+\tif (!done \u0026\u0026 cmd) {\n+\t\tio_uring_cmd_set_res(cmd, UBLK_IO_RES_ABORT);\n+\t\tio_uring_cmd_done(cmd, issue_flags);\n+\t}\n }\n \n /*\n@@ -2816,7 +2821,8 @@ static void ublk_batch_cancel_cmd(struct ublk_queue *ubq,\n \tspin_unlock(\u0026ubq-\u003eevts_lock);\n \n \tif (done) {\n-\t\tio_uring_cmd_done(fcmd-\u003ecmd, UBLK_IO_RES_ABORT, issue_flags);\n+\t\tio_uring_cmd_set_res(fcmd-\u003ecmd, UBLK_IO_RES_ABORT);\n+\t\tio_uring_cmd_done(fcmd-\u003ecmd, issue_flags);\n \t\tublk_batch_free_fcmd(fcmd);\n \t}\n }\n@@ -3526,8 +3532,10 @@ static void ublk_ch_uring_cmd_cb(struct io_tw_req tw_req, io_tw_token_t tw)\n \n \tif (!tw.cancel)\n \t\tret = ublk_ch_uring_cmd_local(cmd, issue_flags);\n-\tif (ret != -EIOCBQUEUED)\n-\t\tio_uring_cmd_done(cmd, ret, issue_flags);\n+\tif (ret != -EIOCBQUEUED) {\n+\t\tio_uring_cmd_set_res(cmd, ret);\n+\t\tio_uring_cmd_done(cmd, issue_flags);\n+\t}\n }\n \n static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)\ndiff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c\nindex 6539d47500986..b50bba207818b 100644\n--- a/drivers/nvme/host/ioctl.c\n+++ b/drivers/nvme/host/ioctl.c\n@@ -423,8 +423,6 @@ struct nvme_uring_data {\n struct nvme_uring_cmd_pdu {\n \tstruct request *req;\n \tstruct bio *bio;\n-\tu64 result;\n-\tint status;\n };\n \n static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(\n@@ -440,8 +438,7 @@ static void nvme_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw)\n \n \tif (pdu-\u003ebio)\n \t\tblk_rq_unmap_user(pdu-\u003ebio);\n-\tio_uring_cmd_done32(ioucmd, pdu-\u003estatus, pdu-\u003eresult,\n-\t\t\t IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n+\tio_uring_cmd_done(ioucmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n }\n \n static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,\n@@ -450,15 +447,17 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,\n {\n \tstruct io_uring_cmd *ioucmd = req-\u003eend_io_data;\n \tstruct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);\n+\tu64 result = le64_to_cpu(nvme_req(req)-\u003eresult.u64);\n+\tint status;\n \n \tif (nvme_req(req)-\u003eflags \u0026 NVME_REQ_CANCELLED) {\n-\t\tpdu-\u003estatus = -EINTR;\n+\t\tstatus = -EINTR;\n \t} else {\n-\t\tpdu-\u003estatus = nvme_req(req)-\u003estatus;\n-\t\tif (!pdu-\u003estatus)\n-\t\t\tpdu-\u003estatus = blk_status_to_errno(err);\n+\t\tstatus = nvme_req(req)-\u003estatus;\n+\t\tif (!status)\n+\t\t\tstatus = blk_status_to_errno(err);\n \t}\n-\tpdu-\u003eresult = le64_to_cpu(nvme_req(req)-\u003eresult.u64);\n+\tio_uring_cmd_set_res32(ioucmd, status, result);\n \n \t/*\n \t * For IOPOLL, check if this completion is happening in the context\n@@ -471,7 +470,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,\n \t iob-\u003epoll_ctx == io_uring_cmd_ctx_handle(ioucmd)) {\n \t\tif (pdu-\u003ebio)\n \t\t\tblk_rq_unmap_user(pdu-\u003ebio);\n-\t\tio_uring_cmd_done32(ioucmd, pdu-\u003estatus, pdu-\u003eresult, 0);\n+\t\tio_uring_cmd_done(ioucmd, 0);\n \t} else {\n \t\tio_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb);\n \t}\ndiff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c\nindex e80dec53174ea..8b32d8e8f29f9 100644\n--- a/drivers/scsi/scsi_bsg.c\n+++ b/drivers/scsi/scsi_bsg.c\n@@ -60,8 +60,8 @@ static void scsi_bsg_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw)\n \t\t\t\t scmd-\u003eresid_len);\n \n \tblk_mq_free_request(rq);\n-\tio_uring_cmd_done32(ioucmd, ret, res2,\n-\t\t\t IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n+\tio_uring_cmd_set_res32(ioucmd, ret, res2);\n+\tio_uring_cmd_done(ioucmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n }\n \n static enum rq_end_io_ret scsi_bsg_uring_cmd_done(struct request *req,\ndiff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c\nindex 72bc9d4f77087..07057a7084529 100644\n--- a/fs/btrfs/ioctl.c\n+++ b/fs/btrfs/ioctl.c\n@@ -4621,7 +4621,8 @@ static void btrfs_uring_read_finished(struct io_tw_req tw_req, io_tw_token_t tw)\n \tbtrfs_unlock_extent(io_tree, priv-\u003estart, priv-\u003elockend, \u0026priv-\u003ecached_state);\n \tbtrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);\n \n-\tio_uring_cmd_done(cmd, ret, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n+\tio_uring_cmd_set_res(cmd, ret);\n+\tio_uring_cmd_done(cmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);\n \tadd_rchar(current, ret);\n \n \tfor (index = 0; index \u003c priv-\u003enr_pages; index++)\ndiff --git a/fs/fuse/dev_uring.c b/fs/fuse/dev_uring.c\nindex 77c8cec43d9c6..c5bb50183e1c6 100644\n--- a/fs/fuse/dev_uring.c\n+++ b/fs/fuse/dev_uring.c\n@@ -366,8 +366,10 @@ static void fuse_uring_entry_teardown(struct fuse_ring_ent *ent)\n \tent-\u003estate = FRRS_RELEASED;\n \tspin_unlock(\u0026queue-\u003elock);\n \n-\tif (cmd)\n-\t\tio_uring_cmd_done(cmd, -ENOTCONN, IO_URING_F_UNLOCKED);\n+\tif (cmd) {\n+\t\tio_uring_cmd_set_res(cmd, -ENOTCONN);\n+\t\tio_uring_cmd_done(cmd, IO_URING_F_UNLOCKED);\n+\t}\n \n \tif (req)\n \t\tfuse_uring_stop_fuse_req_end(req);\n@@ -531,7 +533,8 @@ static void fuse_uring_cancel(struct io_uring_cmd *cmd,\n \n \tif (need_cmd_done) {\n \t\t/* no queue lock to avoid lock order issues */\n-\t\tio_uring_cmd_done(cmd, -ENOTCONN, issue_flags);\n+\t\tio_uring_cmd_set_res(cmd, -ENOTCONN);\n+\t\tio_uring_cmd_done(cmd, issue_flags);\n \t\tkfree(ent);\n \t\tif (atomic_dec_and_test(\u0026queue-\u003ering-\u003equeue_refs))\n \t\t\twake_up_all(\u0026queue-\u003ering-\u003estop_waitq);\n@@ -942,7 +945,8 @@ static void fuse_uring_send(struct fuse_ring_ent *ent, struct io_uring_cmd *cmd,\n \tfuse_uring_add_to_pq(ent);\n \tspin_unlock(\u0026queue-\u003elock);\n \n-\tio_uring_cmd_done(cmd, ret, issue_flags);\n+\tio_uring_cmd_set_res(cmd, ret);\n+\tio_uring_cmd_done(cmd, issue_flags);\n }\n \n /* FUSE_URING_CMD_COMMIT_AND_FETCH handler */\n@@ -1309,7 +1313,8 @@ static void fuse_uring_send_in_task(struct io_tw_req tw_req, io_tw_token_t tw)\n \t\tlist_del_init(\u0026ent-\u003elist);\n \t\tspin_unlock(\u0026queue-\u003elock);\n \n-\t\tio_uring_cmd_done(cmd, err, issue_flags);\n+\t\tio_uring_cmd_set_res(cmd, err);\n+\t\tio_uring_cmd_done(cmd, issue_flags);\n \n \t\tfuse_uring_req_end(ent, ent-\u003efuse_req, err);\n \t\tkfree(ent);\ndiff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h\nindex 331dcbefe72f1..96fcc06097c4e 100644\n--- a/include/linux/io_uring/cmd.h\n+++ b/include/linux/io_uring/cmd.h\n@@ -52,6 +52,10 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,\n \t\t\t\t int ddir, struct iov_iter *iter,\n \t\t\t\t unsigned issue_flags);\n \n+/* One of these must be called prior to io_uring_cmd_done() */\n+void io_uring_cmd_set_res(struct io_uring_cmd *, s32 ret);\n+void io_uring_cmd_set_res32(struct io_uring_cmd *, s32 ret, u64 res2);\n+\n /*\n * Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd\n * and the corresponding io_uring request.\n@@ -59,8 +63,7 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,\n * Note: the caller should never hard code @issue_flags and is only allowed\n * to pass the mask provided by the core io_uring code.\n */\n-void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret, u64 res2,\n-\t\t\t unsigned issue_flags, bool is_cqe32);\n+void io_uring_cmd_done(struct io_uring_cmd *, unsigned issue_flags);\n \n void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,\n \t\t\t io_req_tw_func_t task_work_cb,\n@@ -107,8 +110,15 @@ static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,\n {\n \treturn -EOPNOTSUPP;\n }\n-static inline void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret,\n-\t\tu64 ret2, unsigned issue_flags, bool is_cqe32)\n+static inline void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)\n+{\n+}\n+static inline void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret,\n+\t\t\t\t\t u64 res2)\n+{\n+}\n+static inline void io_uring_cmd_done(struct io_uring_cmd *cmd,\n+\t\t\t\t unsigned issue_flags)\n {\n }\n static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,\n@@ -170,18 +180,6 @@ static inline void *io_uring_cmd_ctx_handle(struct io_uring_cmd *cmd)\n \treturn cmd_to_io_kiocb(cmd)-\u003ectx;\n }\n \n-static inline void io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret,\n-\t\t\t\t unsigned issue_flags)\n-{\n-\treturn __io_uring_cmd_done(ioucmd, ret, 0, issue_flags, false);\n-}\n-\n-static inline void io_uring_cmd_done32(struct io_uring_cmd *ioucmd, s32 ret,\n-\t\t\t\t u64 res2, unsigned issue_flags)\n-{\n-\treturn __io_uring_cmd_done(ioucmd, ret, res2, issue_flags, true);\n-}\n-\n int io_buffer_register_bvec(struct io_uring_cmd *cmd, struct request *rq,\n \t\t\t void (*release)(void *), unsigned int index,\n \t\t\t unsigned int issue_flags);\ndiff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c\nindex 726a659f38c38..ef3e7e352c6af 100644\n--- a/io_uring/uring_cmd.c\n+++ b/io_uring/uring_cmd.c\n@@ -138,19 +138,31 @@ void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,\n }\n EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);\n \n-static inline void io_req_set_cqe32_extra(struct io_kiocb *req,\n-\t\t\t\t\t u64 extra1, u64 extra2)\n+void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)\n {\n-\treq-\u003ebig_cqe.extra1 = extra1;\n-\treq-\u003ebig_cqe.extra2 = extra2;\n+\tstruct io_kiocb *req = cmd_to_io_kiocb(cmd);\n+\n+\tif (ret \u003c 0)\n+\t\treq_set_fail(req);\n+\tio_req_set_res(req, ret, 0);\n }\n+EXPORT_SYMBOL_GPL(io_uring_cmd_set_res);\n+\n+void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret, u64 res2)\n+{\n+\tstruct io_kiocb *req = cmd_to_io_kiocb(cmd);\n+\n+\tif (ret \u003c 0)\n+\t\treq_set_fail(req);\n+\tio_req_set_res32(req, ret, 0, res2, 0);\n+}\n+EXPORT_SYMBOL_GPL(io_uring_cmd_set_res32);\n \n /*\n * Called by consumers of io_uring_cmd, if they originally returned\n * -EIOCBQUEUED upon receiving the command.\n */\n-void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,\n-\t\t unsigned issue_flags, bool is_cqe32)\n+void io_uring_cmd_done(struct io_uring_cmd *ioucmd, unsigned issue_flags)\n {\n \tstruct io_kiocb *req = cmd_to_io_kiocb(ioucmd);\n \n@@ -159,15 +171,6 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,\n \n \tio_uring_cmd_del_cancelable(ioucmd, issue_flags);\n \n-\tif (ret \u003c 0)\n-\t\treq_set_fail(req);\n-\n-\tio_req_set_res(req, ret, 0);\n-\tif (is_cqe32) {\n-\t\tif (req-\u003ectx-\u003eflags \u0026 IORING_SETUP_CQE_MIXED)\n-\t\t\treq-\u003ecqe.flags |= IORING_CQE_F_32;\n-\t\tio_req_set_cqe32_extra(req, res2, 0);\n-\t}\n \tio_req_uring_cleanup(req, issue_flags);\n \tif (req-\u003eflags \u0026 REQ_F_IOPOLL) {\n \t\t/* order with io_do_iopoll() checking -\u003eiopoll_completed */\n@@ -181,7 +184,7 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,\n \t\tio_req_task_work_add(req);\n \t}\n }\n-EXPORT_SYMBOL_GPL(__io_uring_cmd_done);\n+EXPORT_SYMBOL_GPL(io_uring_cmd_done);\n \n int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)\n {\n"
} |
| 2/1 | 2026/08/27 19:22 | agent | patch-evaluator |
0mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"IO_URING",
"BLK_DEV_UBLK",
"NVME_CORE",
"BLK_DEV_NVME",
"BLK_DEV_BSG",
"BTRFS_FS",
"FUSE_FS"
],
"FocusSymbols": [
"io_uring_cmd_set_res",
"io_uring_cmd_set_res32",
"io_uring_cmd_done"
],
"Reasoning": "The patch modifies the core io_uring command API by splitting `io_uring_cmd_done` into `io_uring_cmd_set_res` (or `io_uring_cmd_set_res32`) and `io_uring_cmd_done`. This affects how results are returned for io_uring commands across multiple subsystems including block, ublk, nvme, scsi bsg, btrfs, and fuse. This is a functional change in the core kernel API and its callers, which is worth fuzzing to ensure no regressions or incorrect result handling are introduced.",
"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). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. 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. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 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. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. 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 35f6c1cd5bc9f79d77c85f6b1f68ac3f6f1aa2c3
Author: syz-cluster <triage@syzkaller.com>
Date: Thu Aug 27 19:22:33 2026 +0000
syz-cluster: applied patch under review
diff --git a/block/ioctl.c b/block/ioctl.c
index 64b4e6c0f6965..946cab74f253e 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -871,9 +871,10 @@ static void blk_cmd_complete(struct io_tw_req tw_req, io_tw_token_t tw)
if (bic->res == -EAGAIN && bic->nowait)
io_uring_cmd_issue_blocking(cmd);
- else
- io_uring_cmd_done(cmd, bic->res,
- IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ else {
+ io_uring_cmd_set_res(cmd, bic->res);
+ io_uring_cmd_done(cmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ }
}
static void bio_cmd_bio_end_io(struct bio *bio)
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 4d17ed264da1a..51f15e5b3c01d 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -839,7 +839,8 @@ static void ublk_batch_deinit_fetch_buf(struct ublk_queue *ubq,
__ublk_release_fcmd(ubq);
spin_unlock(&ubq->evts_lock);
- io_uring_cmd_done(fcmd->cmd, res, data->issue_flags);
+ io_uring_cmd_set_res(fcmd->cmd, res);
+ io_uring_cmd_done(fcmd->cmd, data->issue_flags);
ublk_batch_free_fcmd(fcmd);
}
@@ -1642,7 +1643,8 @@ static void ublk_complete_io_cmd(struct ublk_io *io, struct request *req,
struct io_uring_cmd *cmd = __ublk_prep_compl_io_cmd(io, req);
/* tell ublksrv one io request is coming */
- io_uring_cmd_done(cmd, res, issue_flags);
+ io_uring_cmd_set_res(cmd, res);
+ io_uring_cmd_done(cmd, issue_flags);
}
#define UBLK_REQUEUE_DELAY_MS 3
@@ -1728,7 +1730,8 @@ static void ublk_auto_buf_dispatch(const struct ublk_queue *ubq,
if (res != AUTO_BUF_REG_FAIL) {
ublk_auto_buf_io_setup(ubq, req, io, cmd, res);
- io_uring_cmd_done(cmd, UBLK_IO_RES_OK, issue_flags);
+ io_uring_cmd_set_res(cmd, UBLK_IO_RES_OK);
+ io_uring_cmd_done(cmd, issue_flags);
}
}
@@ -2789,8 +2792,10 @@ static void ublk_cancel_cmd(struct ublk_queue *ubq, u16 tag,
}
spin_unlock(&ubq->cancel_lock);
- if (!done && cmd)
- io_uring_cmd_done(cmd, UBLK_IO_RES_ABORT, issue_flags);
+ if (!done && cmd) {
+ io_uring_cmd_set_res(cmd, UBLK_IO_RES_ABORT);
+ io_uring_cmd_done(cmd, issue_flags);
+ }
}
/*
@@ -2816,7 +2821,8 @@ static void ublk_batch_cancel_cmd(struct ublk_queue *ubq,
spin_unlock(&ubq->evts_lock);
if (done) {
- io_uring_cmd_done(fcmd->cmd, UBLK_IO_RES_ABORT, issue_flags);
+ io_uring_cmd_set_res(fcmd->cmd, UBLK_IO_RES_ABORT);
+ io_uring_cmd_done(fcmd->cmd, issue_flags);
ublk_batch_free_fcmd(fcmd);
}
}
@@ -3526,8 +3532,10 @@ static void ublk_ch_uring_cmd_cb(struct io_tw_req tw_req, io_tw_token_t tw)
if (!tw.cancel)
ret = ublk_ch_uring_cmd_local(cmd, issue_flags);
- if (ret != -EIOCBQUEUED)
- io_uring_cmd_done(cmd, ret, issue_flags);
+ if (ret != -EIOCBQUEUED) {
+ io_uring_cmd_set_res(cmd, ret);
+ io_uring_cmd_done(cmd, issue_flags);
+ }
}
static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 6539d47500986..b50bba207818b 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -423,8 +423,6 @@ struct nvme_uring_data {
struct nvme_uring_cmd_pdu {
struct request *req;
struct bio *bio;
- u64 result;
- int status;
};
static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
@@ -440,8 +438,7 @@ static void nvme_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw)
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
- io_uring_cmd_done32(ioucmd, pdu->status, pdu->result,
- IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ io_uring_cmd_done(ioucmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
}
static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
@@ -450,15 +447,17 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
{
struct io_uring_cmd *ioucmd = req->end_io_data;
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
+ u64 result = le64_to_cpu(nvme_req(req)->result.u64);
+ int status;
if (nvme_req(req)->flags & NVME_REQ_CANCELLED) {
- pdu->status = -EINTR;
+ status = -EINTR;
} else {
- pdu->status = nvme_req(req)->status;
- if (!pdu->status)
- pdu->status = blk_status_to_errno(err);
+ status = nvme_req(req)->status;
+ if (!status)
+ status = blk_status_to_errno(err);
}
- pdu->result = le64_to_cpu(nvme_req(req)->result.u64);
+ io_uring_cmd_set_res32(ioucmd, status, result);
/*
* For IOPOLL, check if this completion is happening in the context
@@ -471,7 +470,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
iob->poll_ctx == io_uring_cmd_ctx_handle(ioucmd)) {
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
- io_uring_cmd_done32(ioucmd, pdu->status, pdu->result, 0);
+ io_uring_cmd_done(ioucmd, 0);
} else {
io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb);
}
diff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c
index e80dec53174ea..8b32d8e8f29f9 100644
--- a/drivers/scsi/scsi_bsg.c
+++ b/drivers/scsi/scsi_bsg.c
@@ -60,8 +60,8 @@ static void scsi_bsg_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw)
scmd->resid_len);
blk_mq_free_request(rq);
- io_uring_cmd_done32(ioucmd, ret, res2,
- IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ io_uring_cmd_set_res32(ioucmd, ret, res2);
+ io_uring_cmd_done(ioucmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
}
static enum rq_end_io_ret scsi_bsg_uring_cmd_done(struct request *req,
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 72bc9d4f77087..07057a7084529 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4621,7 +4621,8 @@ static void btrfs_uring_read_finished(struct io_tw_req tw_req, io_tw_token_t tw)
btrfs_unlock_extent(io_tree, priv->start, priv->lockend, &priv->cached_state);
btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
- io_uring_cmd_done(cmd, ret, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ io_uring_cmd_set_res(cmd, ret);
+ io_uring_cmd_done(cmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
add_rchar(current, ret);
for (index = 0; index < priv->nr_pages; index++)
diff --git a/fs/fuse/dev_uring.c b/fs/fuse/dev_uring.c
index 77c8cec43d9c6..c5bb50183e1c6 100644
--- a/fs/fuse/dev_uring.c
+++ b/fs/fuse/dev_uring.c
@@ -366,8 +366,10 @@ static void fuse_uring_entry_teardown(struct fuse_ring_ent *ent)
ent->state = FRRS_RELEASED;
spin_unlock(&queue->lock);
- if (cmd)
- io_uring_cmd_done(cmd, -ENOTCONN, IO_URING_F_UNLOCKED);
+ if (cmd) {
+ io_uring_cmd_set_res(cmd, -ENOTCONN);
+ io_uring_cmd_done(cmd, IO_URING_F_UNLOCKED);
+ }
if (req)
fuse_uring_stop_fuse_req_end(req);
@@ -531,7 +533,8 @@ static void fuse_uring_cancel(struct io_uring_cmd *cmd,
if (need_cmd_done) {
/* no queue lock to avoid lock order issues */
- io_uring_cmd_done(cmd, -ENOTCONN, issue_flags);
+ io_uring_cmd_set_res(cmd, -ENOTCONN);
+ io_uring_cmd_done(cmd, issue_flags);
kfree(ent);
if (atomic_dec_and_test(&queue->ring->queue_refs))
wake_up_all(&queue->ring->stop_waitq);
@@ -942,7 +945,8 @@ static void fuse_uring_send(struct fuse_ring_ent *ent, struct io_uring_cmd *cmd,
fuse_uring_add_to_pq(ent);
spin_unlock(&queue->lock);
- io_uring_cmd_done(cmd, ret, issue_flags);
+ io_uring_cmd_set_res(cmd, ret);
+ io_uring_cmd_done(cmd, issue_flags);
}
/* FUSE_URING_CMD_COMMIT_AND_FETCH handler */
@@ -1309,7 +1313,8 @@ static void fuse_uring_send_in_task(struct io_tw_req tw_req, io_tw_token_t tw)
list_del_init(&ent->list);
spin_unlock(&queue->lock);
- io_uring_cmd_done(cmd, err, issue_flags);
+ io_uring_cmd_set_res(cmd, err);
+ io_uring_cmd_done(cmd, issue_flags);
fuse_uring_req_end(ent, ent->fuse_req, err);
kfree(ent);
diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index 331dcbefe72f1..96fcc06097c4e 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -52,6 +52,10 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
int ddir, struct iov_iter *iter,
unsigned issue_flags);
+/* One of these must be called prior to io_uring_cmd_done() */
+void io_uring_cmd_set_res(struct io_uring_cmd *, s32 ret);
+void io_uring_cmd_set_res32(struct io_uring_cmd *, s32 ret, u64 res2);
+
/*
* Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd
* and the corresponding io_uring request.
@@ -59,8 +63,7 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
* Note: the caller should never hard code @issue_flags and is only allowed
* to pass the mask provided by the core io_uring code.
*/
-void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret, u64 res2,
- unsigned issue_flags, bool is_cqe32);
+void io_uring_cmd_done(struct io_uring_cmd *, unsigned issue_flags);
void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
io_req_tw_func_t task_work_cb,
@@ -107,8 +110,15 @@ static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
{
return -EOPNOTSUPP;
}
-static inline void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret,
- u64 ret2, unsigned issue_flags, bool is_cqe32)
+static inline void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)
+{
+}
+static inline void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret,
+ u64 res2)
+{
+}
+static inline void io_uring_cmd_done(struct io_uring_cmd *cmd,
+ unsigned issue_flags)
{
}
static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
@@ -170,18 +180,6 @@ static inline void *io_uring_cmd_ctx_handle(struct io_uring_cmd *cmd)
return cmd_to_io_kiocb(cmd)->ctx;
}
-static inline void io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret,
- unsigned issue_flags)
-{
- return __io_uring_cmd_done(ioucmd, ret, 0, issue_flags, false);
-}
-
-static inline void io_uring_cmd_done32(struct io_uring_cmd *ioucmd, s32 ret,
- u64 res2, unsigned issue_flags)
-{
- return __io_uring_cmd_done(ioucmd, ret, res2, issue_flags, true);
-}
-
int io_buffer_register_bvec(struct io_uring_cmd *cmd, struct request *rq,
void (*release)(void *), unsigned int index,
unsigned int issue_flags);
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 726a659f38c38..ef3e7e352c6af 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -138,19 +138,31 @@ void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
}
EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
-static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
- u64 extra1, u64 extra2)
+void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)
{
- req->big_cqe.extra1 = extra1;
- req->big_cqe.extra2 = extra2;
+ struct io_kiocb *req = cmd_to_io_kiocb(cmd);
+
+ if (ret < 0)
+ req_set_fail(req);
+ io_req_set_res(req, ret, 0);
}
+EXPORT_SYMBOL_GPL(io_uring_cmd_set_res);
+
+void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret, u64 res2)
+{
+ struct io_kiocb *req = cmd_to_io_kiocb(cmd);
+
+ if (ret < 0)
+ req_set_fail(req);
+ io_req_set_res32(req, ret, 0, res2, 0);
+}
+EXPORT_SYMBOL_GPL(io_uring_cmd_set_res32);
/*
* Called by consumers of io_uring_cmd, if they originally returned
* -EIOCBQUEUED upon receiving the command.
*/
-void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
- unsigned issue_flags, bool is_cqe32)
+void io_uring_cmd_done(struct io_uring_cmd *ioucmd, unsigned issue_flags)
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
@@ -159,15 +171,6 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
io_uring_cmd_del_cancelable(ioucmd, issue_flags);
- if (ret < 0)
- req_set_fail(req);
-
- io_req_set_res(req, ret, 0);
- if (is_cqe32) {
- if (req->ctx->flags & IORING_SETUP_CQE_MIXED)
- req->cqe.flags |= IORING_CQE_F_32;
- io_req_set_cqe32_extra(req, res2, 0);
- }
io_req_uring_cleanup(req, issue_flags);
if (req->flags & REQ_F_IOPOLL) {
/* order with io_do_iopoll() checking ->iopoll_completed */
@@ -181,7 +184,7 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
io_req_task_work_add(req);
}
}
-EXPORT_SYMBOL_GPL(__io_uring_cmd_done);
+EXPORT_SYMBOL_GPL(io_uring_cmd_done);
int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
|
| 3/2 | 2026/08/27 19:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7319 output: 57 thoughts: 701 Thoughts: **My Initial Assessment of the io_uring Patch** Alright, let's dive into this patch. My immediate thought is that this is a significant change, right? We're talking about a core kernel API modification concerning io_uring command result handling. Seeing modifications to `io_uring_cmd_done` and the introduction of `io_uring_cmd_set_res` and `io_uring_cmd_set_res32` immediately flags this as something that warrants careful scrutiny. Because it changes the return status, it is very likely we may introduce new bugs. The fact that this touches a breadth of subsystems - `block/ioctl.c`, `drivers/block/ublk_drv.c`, `drivers/nvme/host/ioctl.c`, `drivers/scsi/scsi_bsg.c`, `fs/btrfs/ioctl.c`, `fs/fuse/dev_uring.c`, along with the header and core io_uring files (`include/linux/io_uring/cmd.h` and `io_uring/uring_cmd.c`) – reinforces that impression. This means functional impact is pretty much guaranteed, and we should prioritize fuzzing to smoke out any issues. Now, let's identify the focal points. My instinct is to focus on the functions directly involved in this new result handling: `io_uring_cmd_set_res`, `io_uring_cmd_set_res32`, and `io_uring_cmd_done`. Beyond those, I'll pay close attention to where these changes are *used*: `ublk_ch_uring_cmd_cb`, `nvme_uring_cmd_end_io`, `scsi_bsg_uring_task_cb`, `btrfs_uring_read_finished`, and `fuse_uring_send`. Next, I need to check the exposure of these symbols. Are `io_uring_cmd_set_res` and `io_uring_cmd_set_res32` exported? Ah, yes, `EXPORT_SYMBOL_GPL`. Now, let's identify the configuration dependencies. `CONFIG_IO_URING` is a given. We'll need `CONFIG_BLK_DEV_UBLK`, `CONFIG_NVME_CORE`, `CONFIG_BLK_DEV_BSG`, `CONFIG_BTRFS_FS`, and `CONFIG_FUSE_FS` to ensure the relevant code paths are tested. I will use `grepper` to double-check those config names. This patch is going to require a thorough review. |
| 4/2 | 2026/08/27 19:22 | tool | grepper |
0mArgs:{
"Expression": "(config BLK_DEV_UBLK|config NVME_CORE|config BLK_DEV_BSG|config BTRFS_FS|config FUSE_FS|config IO_URING)"
}Results: {
"Output": "block/Kconfig=45=config BLK_CGROUP_PUNT_BIO\n--\nblock/Kconfig-47-\nblock/Kconfig:48:config BLK_DEV_BSG_COMMON\nblock/Kconfig-49-\ttristate\n--\nblock/Kconfig=51=config BLK_ICQ\n--\nblock/Kconfig-53-\nblock/Kconfig:54:config BLK_DEV_BSGLIB\nblock/Kconfig-55-\tbool \"Block layer SG support v4 helper lib\"\n--\ndrivers/block/Kconfig=315=config BLK_DEV_RBD\n--\ndrivers/block/Kconfig-327-\ndrivers/block/Kconfig:328:config BLK_DEV_UBLK\ndrivers/block/Kconfig-329-\ttristate \"Userspace block driver (Experimental)\"\n--\ndrivers/nvme/host/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/nvme/host/Kconfig:2:config NVME_CORE\ndrivers/nvme/host/Kconfig-3-\ttristate\n--\ndrivers/scsi/Kconfig=131=config CHR_DEV_SG\n--\ndrivers/scsi/Kconfig-155-\ndrivers/scsi/Kconfig:156:config BLK_DEV_BSG\ndrivers/scsi/Kconfig-157-\tbool \"/dev/bsg support (SG v4)\"\n--\nfs/btrfs/Kconfig-2-\nfs/btrfs/Kconfig:3:config BTRFS_FS\nfs/btrfs/Kconfig-4-\ttristate \"Btrfs filesystem support\"\n--\nfs/btrfs/Kconfig-38-\nfs/btrfs/Kconfig:39:config BTRFS_FS_POSIX_ACL\nfs/btrfs/Kconfig-40-\tbool \"Btrfs POSIX Access Control Lists\"\n--\nfs/btrfs/Kconfig-48-\nfs/btrfs/Kconfig:49:config BTRFS_FS_RUN_SANITY_TESTS\nfs/btrfs/Kconfig-50-\tbool \"Btrfs will run sanity tests upon loading\"\n--\nfs/fuse/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nfs/fuse/Kconfig:2:config FUSE_FS\nfs/fuse/Kconfig-3-\ttristate \"FUSE (Filesystem in Userspace) support\"\n--\ninit/Kconfig=1916=config AIO\n--\ninit/Kconfig-1923-\ninit/Kconfig:1924:config IO_URING\ninit/Kconfig-1925-\tbool \"Enable IO uring support\" if EXPERT\n--\ninit/Kconfig=1933=config GCOV_PROFILE_URING\n--\ninit/Kconfig-1945-\ninit/Kconfig:1946:config IO_URING_MOCK_FILE\ninit/Kconfig-1947-\ttristate \"Enable io_uring mock files (Experimental)\" if EXPERT\n--\nio_uring/Kconfig-5-\nio_uring/Kconfig:6:config IO_URING_ZCRX\nio_uring/Kconfig-7-\tdef_bool y\n--\nio_uring/Kconfig-12-\nio_uring/Kconfig:13:config IO_URING_BPF\nio_uring/Kconfig-14-\tdef_bool y\n--\nio_uring/Kconfig-17-\nio_uring/Kconfig:18:config IO_URING_BPF_OPS\nio_uring/Kconfig-19-\tdef_bool y\n"
} |
| 5/2 | 2026/08/27 19:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9543 output: 22 thoughts: 97 Thoughts: **My Configuration Deep Dive** Okay, so I'm looking at these configurations: `IO_URING`, `BLK_DEV_UBLK`, `NVME_CORE`, `BLK_DEV_BSG`, `BTRFS_FS`, and `FUSE_FS`. I know these, generally, but I'm focusing on the `NVME_CORE` for this particular test scenario. I need to make sure I'm not missing any critical dependencies. My immediate thought is, what are the related configurations that are also required? Off the top of my head, I’m thinking I’ll need to verify `BLK_DEV_NVME` is enabled. It could also potentially be `NVME_TARGET`, or something else specifically NVMe related. Gotta check the dependencies thoroughly to ensure this whole thing works properly and I'm not missing something fundamental. |
| 6/2 | 2026/08/27 19:22 | tool | grepper |
0mArgs:{
"Expression": "config BLK_DEV_NVME"
}Results: {
"Output": "drivers/nvme/host/Kconfig=2=config NVME_CORE\n--\ndrivers/nvme/host/Kconfig-4-\ndrivers/nvme/host/Kconfig:5:config BLK_DEV_NVME\ndrivers/nvme/host/Kconfig-6-\ttristate \"NVM Express block device\"\n"
} |
| 7/2 | 2026/08/27 19:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9934 output: 24 thoughts: 53 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Adding NVMe Block Device Support to My Project** Alright, the next task on my list is pretty clear: I'm going to add `BLK_DEV_NVME` to the system. That's the core of the implementation. Now, before I jump headfirst into the new code, I want to make sure I understand how the relevant structures are handled in the existing codebase. My main concern is the interaction with the `io_uring` commands. Specifically, I'm going to take a look at how results are set and handled within the `io_uring` context. I need to understand how the system manages the return values for these block devices within the `io_uring` framework. I'll need to scrutinize `io_uring_cmd_set_res` and `io_uring_cmd_set_res32` in `io_uring/uring_cmd.c`. I have a feeling those are going to be key pieces of the puzzle for properly handling NVMe completion queues and I/O status. It will also give me a solid point to hook into in the implementation of the block device. |
| 8/2 | 2026/08/27 19:22 | tool | grepper |
0mArgs:{
"Expression": "void io_uring_cmd_set_res"
}Results: {
"Output": "include/linux/io_uring/cmd.h=49=int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,\n--\ninclude/linux/io_uring/cmd.h-55-/* One of these must be called prior to io_uring_cmd_done() */\ninclude/linux/io_uring/cmd.h:56:void io_uring_cmd_set_res(struct io_uring_cmd *, s32 ret);\ninclude/linux/io_uring/cmd.h:57:void io_uring_cmd_set_res32(struct io_uring_cmd *, s32 ret, u64 res2);\ninclude/linux/io_uring/cmd.h-58-\n--\ninclude/linux/io_uring/cmd.h=105=static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,\n--\ninclude/linux/io_uring/cmd.h-112-}\ninclude/linux/io_uring/cmd.h:113:static inline void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)\ninclude/linux/io_uring/cmd.h-114-{\ninclude/linux/io_uring/cmd.h-115-}\ninclude/linux/io_uring/cmd.h:116:static inline void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret,\ninclude/linux/io_uring/cmd.h-117-\t\t\t\t\t u64 res2)\n--\nio_uring/uring_cmd.c=139=EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);\nio_uring/uring_cmd.c-140-\nio_uring/uring_cmd.c:141:void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)\nio_uring/uring_cmd.c-142-{\n--\nio_uring/uring_cmd.c=149=EXPORT_SYMBOL_GPL(io_uring_cmd_set_res);\nio_uring/uring_cmd.c-150-\nio_uring/uring_cmd.c:151:void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret, u64 res2)\nio_uring/uring_cmd.c-152-{\n"
} |
| 9/2 | 2026/08/27 19:23 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10886 output: 19 thoughts: 409 Thoughts: **Refining the Focus: Core API Changes and Key Callers** Okay, let's distill this down. I'm looking at how these io_uring changes are implemented and I need to define the scope of analysis. I see a bunch of symbols, and I need to identify what's critical. Right, so `io_uring_cmd_set_res`, `io_uring_cmd_set_res32`, and `io_uring_cmd_done` immediately stand out. Those are the heart of the API modifications themselves. They are the core changes. Then there are callers to those core changes; the functions that are *using* the new io_uring functionality. We should include some of these for the summary: `blk_cmd_complete`, `ublk_ch_uring_cmd_cb`, `nvme_uring_cmd_end_io`, `scsi_bsg_uring_task_cb`, `btrfs_uring_read_finished`, and `fuse_uring_send` are probably the most salient examples. I'll check the config options associated with each part of this so I know where the support lies. It looks like the relevant configurations are `IO_URING`, `BLK_DEV_UBLK`, `NVME_CORE`, `BLK_DEV_NVME`, `BLK_DEV_BSG`, `BTRFS_FS`, and `FUSE_FS`. Just a quick check... I need to confirm whether `fuse_uring_send` is static or not. This affects the overall architecture. |
| 10/2 | 2026/08/27 19:23 | tool | grepper |
0mArgs:{
"Expression": "fuse_uring_send"
}Results: {
"Output": "fs/fuse/dev_uring.c=921=static int fuse_ring_ent_set_commit(struct fuse_ring_ent *ent)\n--\nfs/fuse/dev_uring.c-935-\nfs/fuse/dev_uring.c:936:static void fuse_uring_send(struct fuse_ring_ent *ent, struct io_uring_cmd *cmd,\nfs/fuse/dev_uring.c-937-\t\t\t ssize_t ret, unsigned int issue_flags)\n--\nfs/fuse/dev_uring.c=953=static int fuse_uring_commit_fetch(struct io_uring_cmd *cmd, int issue_flags,\n--\nfs/fuse/dev_uring.c-1027-\tif (fuse_uring_get_next_fuse_req(ent, queue))\nfs/fuse/dev_uring.c:1028:\t\tfuse_uring_send(ent, cmd, 0, issue_flags);\nfs/fuse/dev_uring.c-1029-\treturn 0;\n--\nfs/fuse/dev_uring.c=1221=int fuse_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)\n--\nfs/fuse/dev_uring.c-1292- */\nfs/fuse/dev_uring.c:1293:static void fuse_uring_send_in_task(struct io_tw_req tw_req, io_tw_token_t tw)\nfs/fuse/dev_uring.c-1294-{\n--\nfs/fuse/dev_uring.c-1307-\t\t}\nfs/fuse/dev_uring.c:1308:\t\tfuse_uring_send(ent, cmd, err, issue_flags);\nfs/fuse/dev_uring.c-1309-\t} else {\n--\nfs/fuse/dev_uring.c=1344=static void fuse_uring_dispatch_ent(struct fuse_ring_ent *ent)\n--\nfs/fuse/dev_uring.c-1348-\turing_cmd_set_ring_ent(cmd, ent);\nfs/fuse/dev_uring.c:1349:\tio_uring_cmd_complete_in_task(cmd, fuse_uring_send_in_task);\nfs/fuse/dev_uring.c-1350-}\n"
} |
| 11/2 | 2026/08/27 19:23 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12237 output: 29 thoughts: 291 Thoughts: **Refining the List of Core io_uring Functions** Okay, so I'm thinking about how to handle the `io_uring` functions. `fuse_uring_send` is static, so it seems redundant to include it. It's best to stick to non-static or essential functions. Focusing on that, I've identified `io_uring_cmd_set_res`, `io_uring_cmd_set_res32`, and `io_uring_cmd_done` as the critical ones. Let's just list those for now, and potentially add a few non-static ones if they stand out. I also checked other functions. I noticed that `blk_cmd_complete`, `ublk_ch_uring_cmd_cb`, `nvme_uring_cmd_end_io`, `scsi_bsg_uring_task_cb`, and `btrfs_uring_read_finished` are all static. Given they're static, they might be inlined or lack clear symbol addresses, so I should omit them. Therefore, for the list, I'll stick with the exported functions: `io_uring_cmd_set_res`, `io_uring_cmd_set_res32`, and `io_uring_cmd_done`. Now, let's just confirm that `io_uring_cmd_done` is actually exported. |
| 12/2 | 2026/08/27 19:23 | tool | grepper |
0mArgs:{
"Expression": "EXPORT_SYMBOL_GPL\\(io_uring_cmd_done\\)"
}Results: {
"Output": "io_uring/uring_cmd.c=165=void io_uring_cmd_done(struct io_uring_cmd *ioucmd, unsigned issue_flags)\n--\nio_uring/uring_cmd.c-186-}\nio_uring/uring_cmd.c:187:EXPORT_SYMBOL_GPL(io_uring_cmd_done);\nio_uring/uring_cmd.c-188-\n"
} |
| 13/2 | 2026/08/27 19:23 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12970 output: 243 thoughts: 256 Thoughts: **My Assessment of the io_uring API Change** Okay, so I've got this patch in front of me, and it looks like a pretty significant shift in how io_uring handles command results. Essentially, they're breaking down `io_uring_cmd_done` into two parts: `io_uring_cmd_set_res` (or `io_uring_cmd_set_res32`) and `io_uring_cmd_done`. This is a core API modification. The symbols that really stand out are: `io_uring_cmd_set_res`, `io_uring_cmd_set_res32`, and `io_uring_cmd_done`. These are the key pieces of the puzzle. I also see these configs potentially being affected: `IO_URING`, `BLK_DEV_UBLK`, `NVME_CORE`, `BLK_DEV_NVME`, `BLK_DEV_BSG`, `BTRFS_FS`, and `FUSE_FS`. This change clearly ripples across quite a few subsystems, including block devices, ublk, NVMe, SCSI, Btrfs, and FUSE. Since it is a functional change, it's pretty clear that this needs some serious fuzzing and testing to make sure we're not introducing regressions or bugs in the way results are handled. Let's call this the `set-results` change, and get to work. |
| 14/2 | 2026/08/27 19:23 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"IO_URING",
"BLK_DEV_UBLK",
"NVME_CORE",
"BLK_DEV_NVME",
"BLK_DEV_BSG",
"BTRFS_FS",
"FUSE_FS"
],
"FocusSymbols": [
"io_uring_cmd_set_res",
"io_uring_cmd_set_res32",
"io_uring_cmd_done"
],
"Reasoning": "The patch modifies the core io_uring command API by splitting `io_uring_cmd_done` into `io_uring_cmd_set_res` (or `io_uring_cmd_set_res32`) and `io_uring_cmd_done`. This affects how results are returned for io_uring commands across multiple subsystems including block, ublk, nvme, scsi bsg, btrfs, and fuse. This is a functional change in the core kernel API and its callers, which is worth fuzzing to ensure no regressions or incorrect result handling are introduced.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"IO_URING",
"BLK_DEV_UBLK",
"NVME_CORE",
"BLK_DEV_NVME",
"BLK_DEV_BSG",
"BTRFS_FS",
"FUSE_FS"
],
"FocusSymbols": [
"io_uring_cmd_set_res",
"io_uring_cmd_set_res32",
"io_uring_cmd_done"
],
"Reasoning": "The patch modifies the core io_uring command API by splitting `io_uring_cmd_done` into `io_uring_cmd_set_res` (or `io_uring_cmd_set_res32`) and `io_uring_cmd_done`. This affects how results are returned for io_uring commands across multiple subsystems including block, ublk, nvme, scsi bsg, btrfs, and fuse. This is a functional change in the core kernel API and its callers, which is worth fuzzing to ensure no regressions or incorrect result handling are introduced.",
"WorthFuzzing": true
} |
| 15/1 | 2026/08/27 19:23 | action | If |
3mArgs:{
"WorthFuzzing": true
}Results: null |
| 16/2 | 2026/08/27 19:23 | agent | kmsan-evaluator |
3mModel:best-expensive Args: null Results: {
"KMSANReasoning": "The patch refactors the `io_uring_cmd_done` API by splitting it into `io_uring_cmd_set_res`/`io_uring_cmd_set_res32` and `io_uring_cmd_done`. The values passed to these functions remain the same as before, and all fields in the completion queue entry (CQE) are explicitly initialized (e.g., `extra2` is set to 0 in `io_req_set_res32`). There are no new structures sent to user space, no changes to bounds checking, and no uninitialized memory risks introduced by this patch. Any potential bugs would be logic errors or use-after-free/out-of-bounds issues, which are adequately covered by KASAN and other standard bug detectors.",
"NeedsKMSAN": false
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
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 35f6c1cd5bc9f79d77c85f6b1f68ac3f6f1aa2c3
Author: syz-cluster <triage@syzkaller.com>
Date: Thu Aug 27 19:22:33 2026 +0000
syz-cluster: applied patch under review
diff --git a/block/ioctl.c b/block/ioctl.c
index 64b4e6c0f6965..946cab74f253e 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -871,9 +871,10 @@ static void blk_cmd_complete(struct io_tw_req tw_req, io_tw_token_t tw)
if (bic->res == -EAGAIN && bic->nowait)
io_uring_cmd_issue_blocking(cmd);
- else
- io_uring_cmd_done(cmd, bic->res,
- IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ else {
+ io_uring_cmd_set_res(cmd, bic->res);
+ io_uring_cmd_done(cmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ }
}
static void bio_cmd_bio_end_io(struct bio *bio)
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 4d17ed264da1a..51f15e5b3c01d 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -839,7 +839,8 @@ static void ublk_batch_deinit_fetch_buf(struct ublk_queue *ubq,
__ublk_release_fcmd(ubq);
spin_unlock(&ubq->evts_lock);
- io_uring_cmd_done(fcmd->cmd, res, data->issue_flags);
+ io_uring_cmd_set_res(fcmd->cmd, res);
+ io_uring_cmd_done(fcmd->cmd, data->issue_flags);
ublk_batch_free_fcmd(fcmd);
}
@@ -1642,7 +1643,8 @@ static void ublk_complete_io_cmd(struct ublk_io *io, struct request *req,
struct io_uring_cmd *cmd = __ublk_prep_compl_io_cmd(io, req);
/* tell ublksrv one io request is coming */
- io_uring_cmd_done(cmd, res, issue_flags);
+ io_uring_cmd_set_res(cmd, res);
+ io_uring_cmd_done(cmd, issue_flags);
}
#define UBLK_REQUEUE_DELAY_MS 3
@@ -1728,7 +1730,8 @@ static void ublk_auto_buf_dispatch(const struct ublk_queue *ubq,
if (res != AUTO_BUF_REG_FAIL) {
ublk_auto_buf_io_setup(ubq, req, io, cmd, res);
- io_uring_cmd_done(cmd, UBLK_IO_RES_OK, issue_flags);
+ io_uring_cmd_set_res(cmd, UBLK_IO_RES_OK);
+ io_uring_cmd_done(cmd, issue_flags);
}
}
@@ -2789,8 +2792,10 @@ static void ublk_cancel_cmd(struct ublk_queue *ubq, u16 tag,
}
spin_unlock(&ubq->cancel_lock);
- if (!done && cmd)
- io_uring_cmd_done(cmd, UBLK_IO_RES_ABORT, issue_flags);
+ if (!done && cmd) {
+ io_uring_cmd_set_res(cmd, UBLK_IO_RES_ABORT);
+ io_uring_cmd_done(cmd, issue_flags);
+ }
}
/*
@@ -2816,7 +2821,8 @@ static void ublk_batch_cancel_cmd(struct ublk_queue *ubq,
spin_unlock(&ubq->evts_lock);
if (done) {
- io_uring_cmd_done(fcmd->cmd, UBLK_IO_RES_ABORT, issue_flags);
+ io_uring_cmd_set_res(fcmd->cmd, UBLK_IO_RES_ABORT);
+ io_uring_cmd_done(fcmd->cmd, issue_flags);
ublk_batch_free_fcmd(fcmd);
}
}
@@ -3526,8 +3532,10 @@ static void ublk_ch_uring_cmd_cb(struct io_tw_req tw_req, io_tw_token_t tw)
if (!tw.cancel)
ret = ublk_ch_uring_cmd_local(cmd, issue_flags);
- if (ret != -EIOCBQUEUED)
- io_uring_cmd_done(cmd, ret, issue_flags);
+ if (ret != -EIOCBQUEUED) {
+ io_uring_cmd_set_res(cmd, ret);
+ io_uring_cmd_done(cmd, issue_flags);
+ }
}
static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 6539d47500986..b50bba207818b 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -423,8 +423,6 @@ struct nvme_uring_data {
struct nvme_uring_cmd_pdu {
struct request *req;
struct bio *bio;
- u64 result;
- int status;
};
static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
@@ -440,8 +438,7 @@ static void nvme_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw)
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
- io_uring_cmd_done32(ioucmd, pdu->status, pdu->result,
- IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ io_uring_cmd_done(ioucmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
}
static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
@@ -450,15 +447,17 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
{
struct io_uring_cmd *ioucmd = req->end_io_data;
struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
+ u64 result = le64_to_cpu(nvme_req(req)->result.u64);
+ int status;
if (nvme_req(req)->flags & NVME_REQ_CANCELLED) {
- pdu->status = -EINTR;
+ status = -EINTR;
} else {
- pdu->status = nvme_req(req)->status;
- if (!pdu->status)
- pdu->status = blk_status_to_errno(err);
+ status = nvme_req(req)->status;
+ if (!status)
+ status = blk_status_to_errno(err);
}
- pdu->result = le64_to_cpu(nvme_req(req)->result.u64);
+ io_uring_cmd_set_res32(ioucmd, status, result);
/*
* For IOPOLL, check if this completion is happening in the context
@@ -471,7 +470,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
iob->poll_ctx == io_uring_cmd_ctx_handle(ioucmd)) {
if (pdu->bio)
blk_rq_unmap_user(pdu->bio);
- io_uring_cmd_done32(ioucmd, pdu->status, pdu->result, 0);
+ io_uring_cmd_done(ioucmd, 0);
} else {
io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb);
}
diff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c
index e80dec53174ea..8b32d8e8f29f9 100644
--- a/drivers/scsi/scsi_bsg.c
+++ b/drivers/scsi/scsi_bsg.c
@@ -60,8 +60,8 @@ static void scsi_bsg_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw)
scmd->resid_len);
blk_mq_free_request(rq);
- io_uring_cmd_done32(ioucmd, ret, res2,
- IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ io_uring_cmd_set_res32(ioucmd, ret, res2);
+ io_uring_cmd_done(ioucmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
}
static enum rq_end_io_ret scsi_bsg_uring_cmd_done(struct request *req,
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 72bc9d4f77087..07057a7084529 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4621,7 +4621,8 @@ static void btrfs_uring_read_finished(struct io_tw_req tw_req, io_tw_token_t tw)
btrfs_unlock_extent(io_tree, priv->start, priv->lockend, &priv->cached_state);
btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
- io_uring_cmd_done(cmd, ret, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
+ io_uring_cmd_set_res(cmd, ret);
+ io_uring_cmd_done(cmd, IO_URING_CMD_TASK_WORK_ISSUE_FLAGS);
add_rchar(current, ret);
for (index = 0; index < priv->nr_pages; index++)
diff --git a/fs/fuse/dev_uring.c b/fs/fuse/dev_uring.c
index 77c8cec43d9c6..c5bb50183e1c6 100644
--- a/fs/fuse/dev_uring.c
+++ b/fs/fuse/dev_uring.c
@@ -366,8 +366,10 @@ static void fuse_uring_entry_teardown(struct fuse_ring_ent *ent)
ent->state = FRRS_RELEASED;
spin_unlock(&queue->lock);
- if (cmd)
- io_uring_cmd_done(cmd, -ENOTCONN, IO_URING_F_UNLOCKED);
+ if (cmd) {
+ io_uring_cmd_set_res(cmd, -ENOTCONN);
+ io_uring_cmd_done(cmd, IO_URING_F_UNLOCKED);
+ }
if (req)
fuse_uring_stop_fuse_req_end(req);
@@ -531,7 +533,8 @@ static void fuse_uring_cancel(struct io_uring_cmd *cmd,
if (need_cmd_done) {
/* no queue lock to avoid lock order issues */
- io_uring_cmd_done(cmd, -ENOTCONN, issue_flags);
+ io_uring_cmd_set_res(cmd, -ENOTCONN);
+ io_uring_cmd_done(cmd, issue_flags);
kfree(ent);
if (atomic_dec_and_test(&queue->ring->queue_refs))
wake_up_all(&queue->ring->stop_waitq);
@@ -942,7 +945,8 @@ static void fuse_uring_send(struct fuse_ring_ent *ent, struct io_uring_cmd *cmd,
fuse_uring_add_to_pq(ent);
spin_unlock(&queue->lock);
- io_uring_cmd_done(cmd, ret, issue_flags);
+ io_uring_cmd_set_res(cmd, ret);
+ io_uring_cmd_done(cmd, issue_flags);
}
/* FUSE_URING_CMD_COMMIT_AND_FETCH handler */
@@ -1309,7 +1313,8 @@ static void fuse_uring_send_in_task(struct io_tw_req tw_req, io_tw_token_t tw)
list_del_init(&ent->list);
spin_unlock(&queue->lock);
- io_uring_cmd_done(cmd, err, issue_flags);
+ io_uring_cmd_set_res(cmd, err);
+ io_uring_cmd_done(cmd, issue_flags);
fuse_uring_req_end(ent, ent->fuse_req, err);
kfree(ent);
diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index 331dcbefe72f1..96fcc06097c4e 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -52,6 +52,10 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
int ddir, struct iov_iter *iter,
unsigned issue_flags);
+/* One of these must be called prior to io_uring_cmd_done() */
+void io_uring_cmd_set_res(struct io_uring_cmd *, s32 ret);
+void io_uring_cmd_set_res32(struct io_uring_cmd *, s32 ret, u64 res2);
+
/*
* Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd
* and the corresponding io_uring request.
@@ -59,8 +63,7 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
* Note: the caller should never hard code @issue_flags and is only allowed
* to pass the mask provided by the core io_uring code.
*/
-void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret, u64 res2,
- unsigned issue_flags, bool is_cqe32);
+void io_uring_cmd_done(struct io_uring_cmd *, unsigned issue_flags);
void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
io_req_tw_func_t task_work_cb,
@@ -107,8 +110,15 @@ static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
{
return -EOPNOTSUPP;
}
-static inline void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret,
- u64 ret2, unsigned issue_flags, bool is_cqe32)
+static inline void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)
+{
+}
+static inline void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret,
+ u64 res2)
+{
+}
+static inline void io_uring_cmd_done(struct io_uring_cmd *cmd,
+ unsigned issue_flags)
{
}
static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
@@ -170,18 +180,6 @@ static inline void *io_uring_cmd_ctx_handle(struct io_uring_cmd *cmd)
return cmd_to_io_kiocb(cmd)->ctx;
}
-static inline void io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret,
- unsigned issue_flags)
-{
- return __io_uring_cmd_done(ioucmd, ret, 0, issue_flags, false);
-}
-
-static inline void io_uring_cmd_done32(struct io_uring_cmd *ioucmd, s32 ret,
- u64 res2, unsigned issue_flags)
-{
- return __io_uring_cmd_done(ioucmd, ret, res2, issue_flags, true);
-}
-
int io_buffer_register_bvec(struct io_uring_cmd *cmd, struct request *rq,
void (*release)(void *), unsigned int index,
unsigned int issue_flags);
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 726a659f38c38..ef3e7e352c6af 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -138,19 +138,31 @@ void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
}
EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
-static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
- u64 extra1, u64 extra2)
+void io_uring_cmd_set_res(struct io_uring_cmd *cmd, s32 ret)
{
- req->big_cqe.extra1 = extra1;
- req->big_cqe.extra2 = extra2;
+ struct io_kiocb *req = cmd_to_io_kiocb(cmd);
+
+ if (ret < 0)
+ req_set_fail(req);
+ io_req_set_res(req, ret, 0);
}
+EXPORT_SYMBOL_GPL(io_uring_cmd_set_res);
+
+void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret, u64 res2)
+{
+ struct io_kiocb *req = cmd_to_io_kiocb(cmd);
+
+ if (ret < 0)
+ req_set_fail(req);
+ io_req_set_res32(req, ret, 0, res2, 0);
+}
+EXPORT_SYMBOL_GPL(io_uring_cmd_set_res32);
/*
* Called by consumers of io_uring_cmd, if they originally returned
* -EIOCBQUEUED upon receiving the command.
*/
-void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
- unsigned issue_flags, bool is_cqe32)
+void io_uring_cmd_done(struct io_uring_cmd *ioucmd, unsigned issue_flags)
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
@@ -159,15 +171,6 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
io_uring_cmd_del_cancelable(ioucmd, issue_flags);
- if (ret < 0)
- req_set_fail(req);
-
- io_req_set_res(req, ret, 0);
- if (is_cqe32) {
- if (req->ctx->flags & IORING_SETUP_CQE_MIXED)
- req->cqe.flags |= IORING_CQE_F_32;
- io_req_set_cqe32_extra(req, res2, 0);
- }
io_req_uring_cleanup(req, issue_flags);
if (req->flags & REQ_F_IOPOLL) {
/* order with io_do_iopoll() checking ->iopoll_completed */
@@ -181,7 +184,7 @@ void __io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
io_req_task_work_add(req);
}
}
-EXPORT_SYMBOL_GPL(__io_uring_cmd_done);
+EXPORT_SYMBOL_GPL(io_uring_cmd_done);
int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
|
| 17/3 | 2026/08/27 19:23 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7316 output: 23 thoughts: 554 Thoughts: **Analyzing the io_uring Command Completion API Change** Okay, so this patch is changing how we handle command completion in io_uring. Previously, `io_uring_cmd_done` and `io_uring_cmd_done32` took the results directly as arguments. Now, we're required to use `io_uring_cmd_set_res` or `io_uring_cmd_set_res32` *before* calling `io_uring_cmd_done`. My immediate thought is, "Are we introducing any uninitialized memory risks here?" We need to be careful with API changes like this. I see the patch touches a fair number of files: `block/ioctl.c`, `drivers/block/ublk_drv.c`, `drivers/nvme/host/ioctl.c`, `drivers/scsi/scsi_bsg.c`, `fs/btrfs/ioctl.c`, `fs/fuse/dev_uring.c`, `include/linux/io_uring/cmd.h`, and `io_uring/uring_cmd.c`. That's a reasonable spread, indicating this is a potentially widely-used change. Looking specifically at `io_uring/uring_cmd.c`, I see the new functions `io_uring_cmd_set_res` and `io_uring_cmd_set_res32`. These set the result (`ret`) for a given command. Interestingly, it checks if `ret < 0` and calls `req_set_fail` if so. Then, it calls `io_req_set_res` or `io_req_set_res32`. Now, that's what I want to see! The crucial part is that `io_req_set_res` and `io_req_set_res32` are called after the `ret` check. My focus here is on understanding precisely how those `io_req_set_resX` functions handle the result setting. I need to track down the implementation of those functions, specifically `io_req_set_res32`, to ensure the data is being handled correctly and that there's no way we could potentially be introducing any vulnerabilities by failing to initialize the memory on command. Time to search for where those are defined. I'll use `grepper` or equivalent tool to find that definition. |
| 18/3 | 2026/08/27 19:23 | tool | grepper |
0mArgs:{
"Expression": "io_req_set_res32"
}Results: {
"Output": "io_uring/io_uring.h=336=static inline u32 ctx_cqe32_flags(struct io_ring_ctx *ctx)\n--\nio_uring/io_uring.h-342-\nio_uring/io_uring.h:343:static inline void io_req_set_res32(struct io_kiocb *req, s32 res, u32 cflags,\nio_uring/io_uring.h-344-\t\t\t\t __u64 extra1, __u64 extra2)\n--\nio_uring/nop.c=58=int io_nop(struct io_kiocb *req, unsigned int issue_flags)\n--\nio_uring/nop.c-80-\tif (nop-\u003eflags \u0026 IORING_NOP_CQE32)\nio_uring/nop.c:81:\t\tio_req_set_res32(req, ret, 0, nop-\u003eextra1, nop-\u003eextra2);\nio_uring/nop.c-82-\telse\n--\nio_uring/uring_cmd.c=151=void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret, u64 res2)\n--\nio_uring/uring_cmd.c-156-\t\treq_set_fail(req);\nio_uring/uring_cmd.c:157:\tio_req_set_res32(req, ret, 0, res2, 0);\nio_uring/uring_cmd.c-158-}\n"
} |
| 19/3 | 2026/08/27 19:23 | llm | kmsan-evaluator |
2mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 8799 output: 37 thoughts: 28 Thoughts: Here's my summary, as if I were thinking these thoughts: **Examining io_req_set_res32** Okay, time to dive into this. First things first, let's head straight to the source. I need to refresh my memory and pinpoint the exact definition of `io_req_set_res32`. I'll go directly to `io_uring/io_uring.h`. This is where the core structures and function prototypes reside. Let's see what's what. Gotta be precise here, no room for guesswork with these low-level interfaces. Time to look up the details! |
| 20/3 | 2026/08/27 19:26 | tool | read-file |
0mArgs:{
"File": "io_uring/io_uring.h",
"FirstLine": 340,
"LineCount": 20
}Results: {
"Contents": " 340:\t\treturn 0;\n 341:\t}\n 342:\t\n 343:\tstatic inline void io_req_set_res32(struct io_kiocb *req, s32 res, u32 cflags,\n 344:\t\t\t\t\t __u64 extra1, __u64 extra2)\n 345:\t{\n 346:\t\treq-\u003ecqe.res = res;\n 347:\t\treq-\u003ecqe.flags = cflags | ctx_cqe32_flags(req-\u003ectx);\n 348:\t\treq-\u003ebig_cqe.extra1 = extra1;\n 349:\t\treq-\u003ebig_cqe.extra2 = extra2;\n 350:\t}\n 351:\t\n 352:\tstatic inline void *io_uring_alloc_async_data(struct io_alloc_cache *cache,\n 353:\t\t\t\t\t\t struct io_kiocb *req)\n 354:\t{\n 355:\t\tif (cache) {\n 356:\t\t\treq-\u003easync_data = io_cache_alloc(cache, GFP_KERNEL);\n 357:\t\t} else {\n 358:\t\t\tconst struct io_issue_def *def = \u0026io_issue_defs[req-\u003eopcode];\n 359:\t\n"
} |
| 21/3 | 2026/08/27 19:26 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9345 output: 194 thoughts: 1201 Thoughts: **Refactoring io_uring_cmd_done: A Deep Dive into Memory Safety** Okay, let's break this down. I'm looking at a refactoring of the `io_uring_cmd_done` API, and my primary concern, as always, is memory safety and correctness. The old code had a combined function, `__io_uring_cmd_done`, which set the result, flags, and extra fields of the completion queue entry (CQE). The new code, `io_uring_cmd_set_res32`, appears to be a cleaner separation of concerns. Initially, I had a hunch about uninitialized memory. In the old code, `__io_uring_cmd_done` first set the CQE flags to `0` and conditionally set the `IORING_CQE_F_32` flag based on `IORING_SETUP_CQE_MIXED`. The new `io_req_set_res32`, however, immediately sets `req->cqe.flags` to `cflags | ctx_cqe32_flags(req->ctx)`. After a quick check, I realized that `ctx_cqe32_flags` achieves the same result as the old conditional: adding the `IORING_CQE_F_32` flag if `IORING_SETUP_CQE_MIXED` is set in the context. So, the flag setting is equivalent, which is great. I'm verifying that there are no uninitialized variables or memory leaks here. The `io_uring_cmd_set_res32` also sets the `extra1` and `extra2` fields. In the example usages of `io_uring_cmd_set_res32` (in `nvme_uring_cmd_end_io` and `scsi_bsg_uring_task_cb`), the `extra1` is passed in as `res2`, which is explicitly assigned. `extra2` is set to `0` in `io_req_set_res32`. So, no uninitialized memory, which is exactly what I was hoping to see. Since this is purely a refactoring, it's not introducing any new user-space structures or changing any bounds checks. This is good news, as it minimizes the risk of introducing subtle bugs or vulnerabilities. Because of the code review, I'm confident that these changes are safe. I will mark `NeedsKMSAN=false` as the code is safe. |
| 22/3 | 2026/08/27 19:26 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch refactors the `io_uring_cmd_done` API by splitting it into `io_uring_cmd_set_res`/`io_uring_cmd_set_res32` and `io_uring_cmd_done`. The values passed to these functions remain the same as before, and all fields in the completion queue entry (CQE) are explicitly initialized (e.g., `extra2` is set to 0 in `io_req_set_res32`). There are no new structures sent to user space, no changes to bounds checking, and no uninitialized memory risks introduced by this patch. Any potential bugs would be logic errors or use-after-free/out-of-bounds issues, which are adequately covered by KASAN and other standard bug detectors.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch refactors the `io_uring_cmd_done` API by splitting it into `io_uring_cmd_set_res`/`io_uring_cmd_set_res32` and `io_uring_cmd_done`. The values passed to these functions remain the same as before, and all fields in the completion queue entry (CQE) are explicitly initialized (e.g., `extra2` is set to 0 in `io_req_set_res32`). There are no new structures sent to user space, no changes to bounds checking, and no uninitialized memory risks introduced by this patch. Any potential bugs would be logic errors or use-after-free/out-of-bounds issues, which are adequately covered by KASAN and other standard bug detectors.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|