AI Trajectory

null

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS"
  ],
  "FocusSymbols": [
    "__check_buffer_access",
    "check_tp_buffer_access",
    "check_buffer_access"
  ],
  "Reasoning": "The patch modifies the BPF verifier to correctly handle negative offsets and overflows when checking buffer access in BPF programs. This is a functional change in a core kernel component (BPF verifier) and should be fuzzed to ensure no regressions or new vulnerabilities are introduced.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 6c18d38e819c52610f05e29f04b8e2db3d2b8625\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Fri Jul 3 04:09:41 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c\nindex 21a365d436a595..421ca118fcbfe6 100644\n--- a/kernel/bpf/verifier.c\n+++ b/kernel/bpf/verifier.c\n@@ -5326,14 +5326,18 @@ static int check_max_stack_depth(struct bpf_verifier_env *env)\n static int __check_buffer_access(struct bpf_verifier_env *env,\n \t\t\t\t const char *buf_info,\n \t\t\t\t const struct bpf_reg_state *reg,\n-\t\t\t\t argno_t argno, int off, int size)\n+\t\t\t\t argno_t argno, int off, int size,\n+\t\t\t\t u32 *access_end)\n {\n+\ts64 start, var_off;\n+\n \tif (off \u003c 0) {\n \t\tverbose(env,\n \t\t\t\"%s invalid %s buffer access: off=%d, size=%d\\n\",\n \t\t\treg_arg_name(env, argno), buf_info, off, size);\n \t\treturn -EACCES;\n \t}\n+\n \tif (!tnum_is_const(reg-\u003evar_off)) {\n \t\tchar tn_buf[48];\n \n@@ -5344,6 +5348,29 @@ static int __check_buffer_access(struct bpf_verifier_env *env,\n \t\treturn -EACCES;\n \t}\n \n+\tvar_off = (s64)reg-\u003evar_off.value;\n+\tif (check_add_overflow(var_off, (s64)off, \u0026start)) {\n+\t\tverbose(env,\n+\t\t\t\"%s invalid %s buffer access: off=%d, var_off=%lld\\n\",\n+\t\t\treg_arg_name(env, argno), buf_info, off, var_off);\n+\t\treturn -EACCES;\n+\t}\n+\n+\tif (start \u003c 0) {\n+\t\tverbose(env,\n+\t\t\t\"%s invalid negative %s buffer offset: off=%d, var_off=%lld\\n\",\n+\t\t\treg_arg_name(env, argno), buf_info, off, var_off);\n+\t\treturn -EACCES;\n+\t}\n+\n+\tif (start \u003e U32_MAX || size \u003c 0 ||\n+\t    check_add_overflow((u32)start, (u32)size, access_end)) {\n+\t\tverbose(env,\n+\t\t\t\"%s invalid %s buffer access: off=%lld, size=%d\\n\",\n+\t\t\treg_arg_name(env, argno), buf_info, start, size);\n+\t\treturn -EACCES;\n+\t}\n+\n \treturn 0;\n }\n \n@@ -5351,13 +5378,15 @@ static int check_tp_buffer_access(struct bpf_verifier_env *env,\n \t\t\t\t  const struct bpf_reg_state *reg,\n \t\t\t\t  argno_t argno, int off, int size)\n {\n+\tu32 access_end;\n \tint err;\n \n-\terr = __check_buffer_access(env, \"tracepoint\", reg, argno, off, size);\n+\terr = __check_buffer_access(env, \"tracepoint\", reg, argno, off, size,\n+\t\t\t\t    \u0026access_end);\n \tif (err)\n \t\treturn err;\n \n-\tenv-\u003eprog-\u003eaux-\u003emax_tp_access = max(reg-\u003evar_off.value + off + size,\n+\tenv-\u003eprog-\u003eaux-\u003emax_tp_access = max(access_end,\n \t\t\t\t\t    env-\u003eprog-\u003eaux-\u003emax_tp_access);\n \n \treturn 0;\n@@ -5370,13 +5399,15 @@ static int check_buffer_access(struct bpf_verifier_env *env,\n \t\t\t       u32 *max_access)\n {\n \tconst char *buf_info = type_is_rdonly_mem(reg-\u003etype) ? \"rdonly\" : \"rdwr\";\n+\tu32 access_end;\n \tint err;\n \n-\terr = __check_buffer_access(env, buf_info, reg, argno, off, size);\n+\terr = __check_buffer_access(env, buf_info, reg, argno, off, size,\n+\t\t\t\t    \u0026access_end);\n \tif (err)\n \t\treturn err;\n \n-\t*max_access = max(reg-\u003evar_off.value + off + size, *max_access);\n+\t*max_access = max(access_end, *max_access);\n \n \treturn 0;\n }\ndiff --git a/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c b/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c\nindex 14a0172e2141e8..4055a6443bc20a 100644\n--- a/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c\n+++ b/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c\n@@ -47,4 +47,20 @@ l0_%=:\t/* shift the buffer pointer to a variable location */\\\n \t: __clobber_all);\n }\n \n+SEC(\"raw_tracepoint.w\")\n+__description(\"raw_tracepoint_writable: reject negative const offset\")\n+__failure\n+__msg(\"invalid negative tracepoint buffer offset\")\n+__naked void tracepoint_writable_reject_negative_const_offset(void)\n+{\n+\tasm volatile (\"\t\t\t\t\t\\\n+\tr6 = *(u64 *)(r1 + 0);\t\t\t\t\\\n+\tr6 += -8;\t\t\t\t\t\\\n+\tr0 = *(u64 *)(r6 + 0);\t\t\t\t\\\n+\texit;\t\t\t\t\t\t\\\n+\"\t:\n+\t:\n+\t: __clobber_all);\n+}\n+\n char _license[] SEC(\"license\") = \"GPL\";\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS"
  ],
  "FocusSymbols": [
    "__check_buffer_access",
    "check_tp_buffer_access",
    "check_buffer_access"
  ],
  "Reasoning": "The patch modifies the BPF verifier to correctly handle negative offsets and overflows when checking buffer access in BPF programs. This is a functional change in a core kernel component (BPF verifier) and should be fuzzed to ensure no regressions or new vulnerabilities are introduced.",
  "WorthFuzzing": true
}

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.

For your convenience, here is the diff of the changes:
commit 6c18d38e819c52610f05e29f04b8e2db3d2b8625
Author: syz-cluster <triage@syzkaller.com>
Date:   Fri Jul 3 04:09:41 2026 +0000

    syz-cluster: applied patch under review

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 21a365d436a595..421ca118fcbfe6 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5326,14 +5326,18 @@ static int check_max_stack_depth(struct bpf_verifier_env *env)
 static int __check_buffer_access(struct bpf_verifier_env *env,
 				 const char *buf_info,
 				 const struct bpf_reg_state *reg,
-				 argno_t argno, int off, int size)
+				 argno_t argno, int off, int size,
+				 u32 *access_end)
 {
+	s64 start, var_off;
+
 	if (off < 0) {
 		verbose(env,
 			"%s invalid %s buffer access: off=%d, size=%d\n",
 			reg_arg_name(env, argno), buf_info, off, size);
 		return -EACCES;
 	}
+
 	if (!tnum_is_const(reg->var_off)) {
 		char tn_buf[48];
 
@@ -5344,6 +5348,29 @@ static int __check_buffer_access(struct bpf_verifier_env *env,
 		return -EACCES;
 	}
 
+	var_off = (s64)reg->var_off.value;
+	if (check_add_overflow(var_off, (s64)off, &start)) {
+		verbose(env,
+			"%s invalid %s buffer access: off=%d, var_off=%lld\n",
+			reg_arg_name(env, argno), buf_info, off, var_off);
+		return -EACCES;
+	}
+
+	if (start < 0) {
+		verbose(env,
+			"%s invalid negative %s buffer offset: off=%d, var_off=%lld\n",
+			reg_arg_name(env, argno), buf_info, off, var_off);
+		return -EACCES;
+	}
+
+	if (start > U32_MAX || size < 0 ||
+	    check_add_overflow((u32)start, (u32)size, access_end)) {
+		verbose(env,
+			"%s invalid %s buffer access: off=%lld, size=%d\n",
+			reg_arg_name(env, argno), buf_info, start, size);
+		return -EACCES;
+	}
+
 	return 0;
 }
 
@@ -5351,13 +5378,15 @@ static int check_tp_buffer_access(struct bpf_verifier_env *env,
 				  const struct bpf_reg_state *reg,
 				  argno_t argno, int off, int size)
 {
+	u32 access_end;
 	int err;
 
-	err = __check_buffer_access(env, "tracepoint", reg, argno, off, size);
+	err = __check_buffer_access(env, "tracepoint", reg, argno, off, size,
+				    &access_end);
 	if (err)
 		return err;
 
-	env->prog->aux->max_tp_access = max(reg->var_off.value + off + size,
+	env->prog->aux->max_tp_access = max(access_end,
 					    env->prog->aux->max_tp_access);
 
 	return 0;
@@ -5370,13 +5399,15 @@ static int check_buffer_access(struct bpf_verifier_env *env,
 			       u32 *max_access)
 {
 	const char *buf_info = type_is_rdonly_mem(reg->type) ? "rdonly" : "rdwr";
+	u32 access_end;
 	int err;
 
-	err = __check_buffer_access(env, buf_info, reg, argno, off, size);
+	err = __check_buffer_access(env, buf_info, reg, argno, off, size,
+				    &access_end);
 	if (err)
 		return err;
 
-	*max_access = max(reg->var_off.value + off + size, *max_access);
+	*max_access = max(access_end, *max_access);
 
 	return 0;
 }
diff --git a/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c b/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c
index 14a0172e2141e8..4055a6443bc20a 100644
--- a/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c
+++ b/tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c
@@ -47,4 +47,20 @@ l0_%=:	/* shift the buffer pointer to a variable location */\
 	: __clobber_all);
 }
 
+SEC("raw_tracepoint.w")
+__description("raw_tracepoint_writable: reject negative const offset")
+__failure
+__msg("invalid negative tracepoint buffer offset")
+__naked void tracepoint_writable_reject_negative_const_offset(void)
+{
+	asm volatile ("					\
+	r6 = *(u64 *)(r1 + 0);				\
+	r6 += -8;					\
+	r0 = *(u64 *)(r6 + 0);				\
+	exit;						\
+"	:
+	:
+	: __clobber_all);
+}
+
 char _license[] SEC("license") = "GPL";

gemini-3.1-pro-preview

null

null

							input: 3170
							output: 20
							thoughts: 212
						

**Analyzing a Kernel BPF Verifier Patch**

Okay, so I'm looking at a patch that tweaks the BPF verifier, specifically `kernel/bpf/verifier.c`. It's got a corresponding test case in `tools/testing/selftests/bpf/progs/verifier_raw_tp_writable.c`. My initial assessment is that this is a functional change. They're modifying `__check_buffer_access` to correctly handle negative offsets and overflows – critical for ensuring BPF programs don't wreak havoc on memory.

Essentially, the patch updates `check_tp_buffer_access` and `check_buffer_access` to correctly use the new `access_end` output of the `__check_buffer_access` function. This is significant because the BPF verifier is a *core* component of the kernel, and even subtle changes can have far-reaching consequences, especially in how it handles memory access. Given its importance and the nature of the change, fuzzer coverage is *essential*. This is something that really needs to be hit hard with fuzzing.

My next immediate task is figuring out the relevant kernel configuration options. Since this involves the BPF verifier, my default assumption is that `CONFIG_BPF_SYSCALL` will be the key. However, it's always wise to be thorough.

To make sure I'm not missing anything, I'll use `grepper` to search the kernel source tree for occurrences of either `__check_buffer_access` or `check_tp_buffer_access`. That should quickly uncover any dependencies or related configurations I might be overlooking.

{
  "Expression": "__check_buffer_access"
}

{
  "Output": "kernel/bpf/verifier.c=5272=static int check_max_stack_depth(struct bpf_verifier_env *env)\n--\nkernel/bpf/verifier.c-5325-\nkernel/bpf/verifier.c:5326:static int __check_buffer_access(struct bpf_verifier_env *env,\nkernel/bpf/verifier.c-5327-\t\t\t\t const char *buf_info,\n--\nkernel/bpf/verifier.c=5377=static int check_tp_buffer_access(struct bpf_verifier_env *env,\n--\nkernel/bpf/verifier.c-5383-\nkernel/bpf/verifier.c:5384:\terr = __check_buffer_access(env, \"tracepoint\", reg, argno, off, size,\nkernel/bpf/verifier.c-5385-\t\t\t\t    \u0026access_end);\n--\nkernel/bpf/verifier.c=5395=static int check_buffer_access(struct bpf_verifier_env *env,\n--\nkernel/bpf/verifier.c-5404-\nkernel/bpf/verifier.c:5405:\terr = __check_buffer_access(env, buf_info, reg, argno, off, size,\nkernel/bpf/verifier.c-5406-\t\t\t\t    \u0026access_end);\n"
}

gemini-3.1-pro-preview

null

null

							input: 4104
							output: 21
							thoughts: 52
						

Okay, here's my take on those modifications.

**Analyzing the Buffer Access Functions**

Alright, so the focus is on three functions specifically: `__check_buffer_access`, `check_tp_buffer_access`, and `check_buffer_access`. Clearly, these are all involved in controlling and verifying access to some sort of buffer within the system, likely related to eBPF. I'll need to dig into the context of where these are used to get the full picture, but my initial thought is that the differentiation between them might be based on factors like:

*   **Underlying Target:** The use of `tp` in `check_tp_buffer_access` likely means it's specific to tracepoint data structures. `__check_buffer_access` might suggest a more internal, low-level variant. `check_buffer_access` is likely a more general-purpose routine.
*   **Security Context:** There could be different security levels or access rules at play. Perhaps `__check_buffer_access` is for highly privileged code or for internal kernel structures, while `check_buffer_access` is for user-space programs with some level of trust.
*   **Verification Strategy:** Each function might employ different access control mechanisms. We might see things like range checks, permission checks, or size limitations enforced.

Given that these functions relate to BPF, a primary concern will be preventing buffer overflows, out-of-bounds access, and generally ensuring the integrity and safety of the kernel. This is especially critical since BPF allows untrusted code to run within the kernel.

Now, my next logical step is to dive into the configuration requirements. To understand what's *actually* changing, I need to look at `kernel/bpf/verifier.c`. What configurations are being influenced or needed for these access checks? Are these new features being added, or existing access strategies being modified? Are there any config options that influence the way these functions behave, such as different levels of buffer size validation or more stringent checks enabled? It's essential to understand the build context, and what features are enabled. I'll be looking for things like:

*   **Configuration Dependencies:** Are these changes contingent on specific kernel configuration options? (e.g., `CONFIG_BPF_JIT`, `CONFIG_BPF_EVENTS`, or other related settings).
*   **Performance Tradeoffs:** If there are new buffer access checks, are there performance implications? Are there configuration options to adjust the strictness of the checks to balance security and speed?
*   **Security Levels:** Are there new options to configure the degree of security? Are we now able to tighten the controls?
*   **Compatibility Issues:** Could these modifications break existing eBPF programs or require recompilation? If so, what are the compatibility options?

Basically, I need the context provided by `kernel/bpf/verifier.c` to fully grasp the scope and impact of these buffer access function modifications.

{
  "Expression": "config BPF_SYSCALL"
}

{
  "Output": "kernel/bpf/Kconfig=25=menu \"BPF subsystem\"\nkernel/bpf/Kconfig-26-\nkernel/bpf/Kconfig:27:config BPF_SYSCALL\nkernel/bpf/Kconfig-28-\tbool \"Enable bpf() system call\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 4888
							output: 21
							thoughts: 34
						

Okay, here's my interpretation of those thoughts, framed as my own:

**Investigating Tracepoint Buffer Access**

Right, let's get down to brass tacks. The primary thing to consider here is definitely the `BPF_SYSCALL` mechanism. That's the core. But I need to be thorough; I can't just assume. I need to know if there are any other configurations or potential edge cases. So, I need to specifically check, and I mean *really* check, whether there are any other configurations or settings, for `check_tp_buffer_access`. Gotta be meticulous, especially with something that touches memory access. I need to make sure I haven't missed a detail.

{
  "Expression": "check_tp_buffer_access"
}

{
  "Output": "kernel/bpf/verifier.c=5326=static int __check_buffer_access(struct bpf_verifier_env *env,\n--\nkernel/bpf/verifier.c-5376-\nkernel/bpf/verifier.c:5377:static int check_tp_buffer_access(struct bpf_verifier_env *env,\nkernel/bpf/verifier.c-5378-\t\t\t\t  const struct bpf_reg_state *reg,\n--\nkernel/bpf/verifier.c=6101=static int check_mem_access(struct bpf_verifier_env *env, int insn_idx, struct bpf_reg_state *reg, argno_t argno,\n--\nkernel/bpf/verifier.c-6309-\t} else if (reg-\u003etype == PTR_TO_TP_BUFFER) {\nkernel/bpf/verifier.c:6310:\t\terr = check_tp_buffer_access(env, reg, argno, off, size);\nkernel/bpf/verifier.c-6311-\t\tif (!err \u0026\u0026 t == BPF_READ \u0026\u0026 value_regno \u003e= 0)\n"
}

gemini-3.1-pro-preview

null

null

							input: 5387
							output: 19
							thoughts: 10
						

Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person:

**Initial Assessment of Buffer Access Function**

Hmm, `check_buffer_access`... let's see. My mind immediately jumps to the implications. Is this about verifying read/write permissions? Are we dealing with bounds checking on pointers, or perhaps access control within a shared memory region? I need more context to be sure, but my initial thought is that this function likely plays a critical role in preventing vulnerabilities.

I'm probably going to need to look into its implementation to see if it's handling corner cases gracefully, specifically:

*   **Integer overflow:** Could there be an integer overflow that bypasses intended checks for buffer size.
*   **Race conditions:** If we are in a multithreaded environment, how is this handled to prevent corruption?
*   **Off-by-one errors:** Could there be subtle indexing problems?
*   **Security Context:** Does this function consider the security context of the accessing process or thread?

These are all standard considerations, but without knowing the specifics of this function, I can't begin to assess its effectiveness. The name suggests a good foundation for robust code, but I need to see the actual implementation. I also need to consider where it's called and how it's used. Are there any other access controls in place, or is this the primary protection?

{
  "Expression": "check_buffer_access"
}

{
  "Output": "kernel/bpf/verifier.c=5272=static int check_max_stack_depth(struct bpf_verifier_env *env)\n--\nkernel/bpf/verifier.c-5325-\nkernel/bpf/verifier.c:5326:static int __check_buffer_access(struct bpf_verifier_env *env,\nkernel/bpf/verifier.c-5327-\t\t\t\t const char *buf_info,\n--\nkernel/bpf/verifier.c=5377=static int check_tp_buffer_access(struct bpf_verifier_env *env,\n--\nkernel/bpf/verifier.c-5383-\nkernel/bpf/verifier.c:5384:\terr = __check_buffer_access(env, \"tracepoint\", reg, argno, off, size,\nkernel/bpf/verifier.c-5385-\t\t\t\t    \u0026access_end);\n--\nkernel/bpf/verifier.c-5394-\nkernel/bpf/verifier.c:5395:static int check_buffer_access(struct bpf_verifier_env *env,\nkernel/bpf/verifier.c-5396-\t\t\t       const struct bpf_reg_state *reg,\n--\nkernel/bpf/verifier.c-5404-\nkernel/bpf/verifier.c:5405:\terr = __check_buffer_access(env, buf_info, reg, argno, off, size,\nkernel/bpf/verifier.c-5406-\t\t\t\t    \u0026access_end);\n--\nkernel/bpf/verifier.c=6101=static int check_mem_access(struct bpf_verifier_env *env, int insn_idx, struct bpf_reg_state *reg, argno_t argno,\n--\nkernel/bpf/verifier.c-6335-\nkernel/bpf/verifier.c:6336:\t\terr = check_buffer_access(env, reg, argno, off, size, false,\nkernel/bpf/verifier.c-6337-\t\t\t\t\t  max_access);\n--\nkernel/bpf/verifier.c=6764=static int check_helper_mem_access(struct bpf_verifier_env *env, struct bpf_reg_state *reg, argno_t argno,\n--\nkernel/bpf/verifier.c-6812-\t\t}\nkernel/bpf/verifier.c:6813:\t\treturn check_buffer_access(env, reg, argno, 0,\nkernel/bpf/verifier.c-6814-\t\t\t\t\t   access_size, zero_size_allowed,\n"
}

gemini-3.1-pro-preview

null

null

							input: 6379
							output: 19
							thoughts: 97
						

**Analyzing BPF Verifier Functionality for Raw Tracepoint Write Access**

Okay, so I'm looking at these functions: `check_buffer_access`, `check_tp_buffer_access`, and `__check_buffer_access`. These are all crucial parts of the BPF verifier, obviously. They get called during the verification process of a BPF program – making sure everything is safe and sound before it runs.

My primary focus here is the configuration, primarily driven by `BPF_SYSCALL`, that's the main point. The question is, are there any other relevant configurations? Especially related to writable raw tracepoints. The test case I'm reviewing leverages `raw_tracepoint.w`, so I need to dig deeper and see if there are any specific configurations linked to write access within raw tracepoints. I need to understand if there is a specific configuration in this case, relating to writable raw tracepoints.

{
  "Expression": "config BPF_EVENTS"
}

{
  "Output": "kernel/trace/Kconfig=839=config EPROBE_EVENTS\n--\nkernel/trace/Kconfig-852-\nkernel/trace/Kconfig:853:config BPF_EVENTS\nkernel/trace/Kconfig-854-\tdepends on BPF_SYSCALL\n"
}

gemini-3.1-pro-preview

null

null

							input: 6774
							output: 18
							thoughts: 76
						

Okay, here's my understanding, considering I'm trying to optimize this kernel configuration:

**Kernel Configuration Deep Dive**

Alright, so the current direction seems sound. I'm going to include `BPF_EVENTS`. That's a good starting point for tracing and instrumentation. Now, I should also double-check the interaction between `BPF_SYSCALL` and `BPF_EVENTS`, ensuring there are no unintended conflicts or dependencies. The goal is a lean, efficient configuration, so understanding the interplay of these features is critical.

Regarding potential areas of concern, the primary focus symbols look to be: `__check_buffer_access`, `check_tp_buffer_access`, and `check_buffer_access`. These symbols are obviously important and relate to memory access checks. I'll need to scrutinize them closely to understand how `BPF_EVENTS` and `BPF_SYSCALL` might influence their behavior or trigger any performance bottlenecks. Are there any existing bug reports? Any known interactions in similar configurations?

Finally, I need to take a step back and consider if there are *other* relevant configuration options that might also impact performance or functionality. I need a holistic view to ensure that I haven't overlooked any crucial parameters or interactions that could contribute to, or detract from, the overall design goals. It's a comprehensive approach that's needed here, as always.

{
  "Expression": "raw_tracepoint"
}

{
  "Output": "\nFull output is too long, showing 500 out of 927 lines.\nUse more precise expression if possible.\n\nDocumentation/bpf/drgn.rst=35=List BPF programs (full names are obtained from BTF)::\n--\nDocumentation/bpf/drgn.rst-39-      4632: BPF_PROG_TYPE_CGROUP_SOCK_ADDR   tw_ipt_bind\nDocumentation/bpf/drgn.rst:40:     49464: BPF_PROG_TYPE_RAW_TRACEPOINT     raw_tracepoint__sched_process_exit\nDocumentation/bpf/drgn.rst-41-\n--\nDocumentation/bpf/libbpf/program_types.rst=18=described in more detail in the footnotes.\n--\nDocumentation/bpf/libbpf/program_types.rst-145-+                                           +                                        +----------------------------------+-----------+\nDocumentation/bpf/libbpf/program_types.rst:146:|                                           |                                        | ``raw_tracepoint.w+``            |           |\nDocumentation/bpf/libbpf/program_types.rst-147-+-------------------------------------------+----------------------------------------+----------------------------------+-----------+\n--\nDocumentation/bpf/libbpf/program_types.rst-149-+                                           +                                        +----------------------------------+-----------+\nDocumentation/bpf/libbpf/program_types.rst:150:|                                           |                                        | ``raw_tracepoint+``              |           |\nDocumentation/bpf/libbpf/program_types.rst-151-+-------------------------------------------+----------------------------------------+----------------------------------+-----------+\n--\nDocumentation/bpf/libbpf/program_types.rst-248-.. [#lsm] The ``lsm`` attachment format is ``lsm[.s]/\u003chook\u003e``.\nDocumentation/bpf/libbpf/program_types.rst:249:.. [#rawtp] The ``raw_tp`` attach format is ``raw_tracepoint[.w]/\u003ctracepoint\u003e``.\nDocumentation/bpf/libbpf/program_types.rst-250-.. [#tc_legacy] The ``tc``, ``classifier`` and ``action`` attach types are deprecated, use\n--\ninclude/linux/bpf_types.h=43=BPF_PROG_TYPE(BPF_PROG_TYPE_PERF_EVENT, perf_event,\ninclude/linux/bpf_types.h-44-\t      struct bpf_perf_event_data, struct bpf_perf_event_data_kern)\ninclude/linux/bpf_types.h:45:BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT, raw_tracepoint,\ninclude/linux/bpf_types.h:46:\t      struct bpf_raw_tracepoint_args, u64)\ninclude/linux/bpf_types.h:47:BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, raw_tracepoint_writable,\ninclude/linux/bpf_types.h:48:\t      struct bpf_raw_tracepoint_args, u64)\ninclude/linux/bpf_types.h-49-BPF_PROG_TYPE(BPF_PROG_TYPE_TRACING, tracing,\n--\ninclude/linux/bpf_types.h=137=BPF_MAP_TYPE(BPF_MAP_TYPE_RHASH, rhtab_map_ops)\ninclude/linux/bpf_types.h-138-\ninclude/linux/bpf_types.h:139:BPF_LINK_TYPE(BPF_LINK_TYPE_RAW_TRACEPOINT, raw_tracepoint)\ninclude/linux/bpf_types.h-140-BPF_LINK_TYPE(BPF_LINK_TYPE_TRACING, tracing)\n--\ninclude/linux/trace_events.h=780=int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link);\ninclude/linux/trace_events.h-781-\ninclude/linux/trace_events.h:782:struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name);\ninclude/linux/trace_events.h:783:void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp);\ninclude/linux/trace_events.h-784-int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,\n--\ninclude/linux/trace_events.h=820=static inline int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link)\n--\ninclude/linux/trace_events.h-823-}\ninclude/linux/trace_events.h:824:static inline struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)\ninclude/linux/trace_events.h-825-{\n--\ninclude/linux/trace_events.h-827-}\ninclude/linux/trace_events.h:828:static inline void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)\ninclude/linux/trace_events.h-829-{\n--\ninclude/uapi/linux/bpf.h=1527=union bpf_attr {\n--\ninclude/uapi/linux/bpf.h-1773-\t\t__aligned_u64\tcookie;\ninclude/uapi/linux/bpf.h:1774:\t} raw_tracepoint;\ninclude/uapi/linux/bpf.h-1775-\n--\ninclude/uapi/linux/bpf.h-4292- * \t\tThis helper is similar to **bpf_perf_event_output**\\ () but\ninclude/uapi/linux/bpf.h:4293: * \t\trestricted to raw_tracepoint bpf programs.\ninclude/uapi/linux/bpf.h-4294- * \tReturn\n--\ninclude/uapi/linux/bpf.h-4440- *\t\tThis helper is similar to **bpf_perf_eventoutput**\\ () but\ninclude/uapi/linux/bpf.h:4441: *\t\trestricted to raw_tracepoint bpf programs.\ninclude/uapi/linux/bpf.h-4442- *\tReturn\n--\ninclude/uapi/linux/bpf.h=6763=struct bpf_link_info {\n--\ninclude/uapi/linux/bpf.h-6772-\t\t\t__u64 cookie;\ninclude/uapi/linux/bpf.h:6773:\t\t} raw_tracepoint;\ninclude/uapi/linux/bpf.h-6774-\t\tstruct {\n--\ninclude/uapi/linux/bpf.h=7309=struct bpf_cgroup_dev_ctx {\n--\ninclude/uapi/linux/bpf.h-7315-\ninclude/uapi/linux/bpf.h:7316:struct bpf_raw_tracepoint_args {\ninclude/uapi/linux/bpf.h-7317-\t__u64 args[0];\n--\nkernel/bpf/btf.c=6216=static int btf_validate_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,\n--\nkernel/bpf/btf.c-6283-\t\t\tif (__btf_type_is_struct(t) \u0026\u0026\nkernel/bpf/btf.c:6284:\t\t\t    strcmp(tname, \"bpf_raw_tracepoint_args\") == 0)\nkernel/bpf/btf.c-6285-\t\t\t\treturn 0;\n--\nkernel/bpf/syscall.c=3689=static int bpf_tracing_prog_attach(struct bpf_prog *prog,\n--\nkernel/bpf/syscall.c-3783-\t * - if tgt_prog == NULL when this function was called using the old\nkernel/bpf/syscall.c:3784:\t *   raw_tracepoint_open API, and we need a target from prog-\u003eaux\nkernel/bpf/syscall.c-3785-\t *\n--\nkernel/bpf/syscall.c=3908=static void bpf_raw_tp_link_release(struct bpf_link *link)\n--\nkernel/bpf/syscall.c-3913-\tbpf_probe_unregister(raw_tp-\u003ebtp, raw_tp);\nkernel/bpf/syscall.c:3914:\tbpf_put_raw_tracepoint(raw_tp-\u003ebtp);\nkernel/bpf/syscall.c-3915-}\n--\nkernel/bpf/syscall.c=3957=static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,\n--\nkernel/bpf/syscall.c-3961-\t\tcontainer_of(link, struct bpf_raw_tp_link, link);\nkernel/bpf/syscall.c:3962:\tchar __user *ubuf = u64_to_user_ptr(info-\u003eraw_tracepoint.tp_name);\nkernel/bpf/syscall.c-3963-\tconst char *tp_name = raw_tp_link-\u003ebtp-\u003etp-\u003ename;\nkernel/bpf/syscall.c:3964:\tu32 ulen = info-\u003eraw_tracepoint.tp_name_len;\nkernel/bpf/syscall.c-3965-\tsize_t tp_len = strlen(tp_name);\n--\nkernel/bpf/syscall.c-3969-\nkernel/bpf/syscall.c:3970:\tinfo-\u003eraw_tracepoint.tp_name_len = tp_len + 1;\nkernel/bpf/syscall.c:3971:\tinfo-\u003eraw_tracepoint.cookie = raw_tp_link-\u003ecookie;\nkernel/bpf/syscall.c-3972-\n--\nkernel/bpf/syscall.c=4352=static int bpf_raw_tp_link_attach(struct bpf_prog *prog,\n--\nkernel/bpf/syscall.c-4388-\nkernel/bpf/syscall.c:4389:\tbtp = bpf_get_raw_tracepoint(tp_name);\nkernel/bpf/syscall.c-4390-\tif (!btp)\n--\nkernel/bpf/syscall.c-4393-\tif (prog-\u003esleepable \u0026\u0026 !tracepoint_is_faultable(btp-\u003etp)) {\nkernel/bpf/syscall.c:4394:\t\tbpf_put_raw_tracepoint(btp);\nkernel/bpf/syscall.c-4395-\t\treturn -EINVAL;\n--\nkernel/bpf/syscall.c-4423-out_put_btp:\nkernel/bpf/syscall.c:4424:\tbpf_put_raw_tracepoint(btp);\nkernel/bpf/syscall.c-4425-\treturn err;\n--\nkernel/bpf/syscall.c-4427-\nkernel/bpf/syscall.c:4428:#define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.cookie\nkernel/bpf/syscall.c-4429-\nkernel/bpf/syscall.c:4430:static int bpf_raw_tracepoint_open(const union bpf_attr *attr)\nkernel/bpf/syscall.c-4431-{\n--\nkernel/bpf/syscall.c-4439-\nkernel/bpf/syscall.c:4440:\tprog = bpf_prog_get(attr-\u003eraw_tracepoint.prog_fd);\nkernel/bpf/syscall.c-4441-\tif (IS_ERR(prog))\n--\nkernel/bpf/syscall.c-4443-\nkernel/bpf/syscall.c:4444:\ttp_name = u64_to_user_ptr(attr-\u003eraw_tracepoint.name);\nkernel/bpf/syscall.c:4445:\tcookie = attr-\u003eraw_tracepoint.cookie;\nkernel/bpf/syscall.c-4446-\tfd = bpf_raw_tp_link_attach(prog, tp_name, cookie, prog-\u003eexpected_attach_type);\n--\nkernel/bpf/syscall.c=6354=static int __sys_bpf(enum bpf_cmd cmd, bpfptr_t uattr, unsigned int size,\n--\nkernel/bpf/syscall.c-6459-\tcase BPF_RAW_TRACEPOINT_OPEN:\nkernel/bpf/syscall.c:6460:\t\terr = bpf_raw_tracepoint_open(\u0026attr);\nkernel/bpf/syscall.c-6461-\t\tbreak;\n--\nkernel/bpf/verifier.c=18895=int bpf_check_attach_target(struct bpf_verifier_log *log,\n--\nkernel/bpf/verifier.c-19066-\t\t */\nkernel/bpf/verifier.c:19067:\t\tbtp = bpf_get_raw_tracepoint(tname);\nkernel/bpf/verifier.c-19068-\t\tif (!btp)\n--\nkernel/bpf/verifier.c-19072-\t\t\t\ttname);\nkernel/bpf/verifier.c:19073:\t\t\tbpf_put_raw_tracepoint(btp);\nkernel/bpf/verifier.c-19074-\t\t\treturn -EINVAL;\n--\nkernel/bpf/verifier.c-19077-\t\t\t\t\ttrace_symbol);\nkernel/bpf/verifier.c:19078:\t\tbpf_put_raw_tracepoint(btp);\nkernel/bpf/verifier.c-19079-\n--\nkernel/trace/bpf_trace.c=55=static DEFINE_MUTEX(bpf_module_mutex);\nkernel/trace/bpf_trace.c-56-\nkernel/trace/bpf_trace.c:57:static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name)\nkernel/trace/bpf_trace.c-58-{\n--\nkernel/trace/bpf_trace.c-78-#else\nkernel/trace/bpf_trace.c:79:static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name)\nkernel/trace/bpf_trace.c-80-{\n--\nkernel/trace/bpf_trace.c=1620=static void put_bpf_raw_tp_regs(void)\n--\nkernel/trace/bpf_trace.c-1624-\nkernel/trace/bpf_trace.c:1625:BPF_CALL_5(bpf_perf_event_output_raw_tp, struct bpf_raw_tracepoint_args *, args,\nkernel/trace/bpf_trace.c-1626-\t   struct bpf_map *, map, u64, flags, void *, data, u64, size)\n--\nkernel/trace/bpf_trace.c=1654=extern const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto;\nkernel/trace/bpf_trace.c-1655-\nkernel/trace/bpf_trace.c:1656:BPF_CALL_3(bpf_get_stackid_raw_tp, struct bpf_raw_tracepoint_args *, args,\nkernel/trace/bpf_trace.c-1657-\t   struct bpf_map *, map, u64, flags)\n--\nkernel/trace/bpf_trace.c=1673=static const struct bpf_func_proto bpf_get_stackid_proto_raw_tp = {\n--\nkernel/trace/bpf_trace.c-1681-\nkernel/trace/bpf_trace.c:1682:BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args,\nkernel/trace/bpf_trace.c-1683-\t   void *, buf, u32, size, u64, flags)\n--\nkernel/trace/bpf_trace.c=1816=int __weak bpf_prog_test_run_tracing(struct bpf_prog *prog,\n--\nkernel/trace/bpf_trace.c-1822-\nkernel/trace/bpf_trace.c:1823:const struct bpf_verifier_ops raw_tracepoint_verifier_ops = {\nkernel/trace/bpf_trace.c-1824-\t.get_func_proto  = raw_tp_prog_func_proto,\n--\nkernel/trace/bpf_trace.c-1827-\nkernel/trace/bpf_trace.c:1828:const struct bpf_prog_ops raw_tracepoint_prog_ops = {\nkernel/trace/bpf_trace.c-1829-#ifdef CONFIG_NET\n--\nkernel/trace/bpf_trace.c=1843=static bool raw_tp_writable_prog_is_valid_access(int off, int size,\n--\nkernel/trace/bpf_trace.c-1855-\nkernel/trace/bpf_trace.c:1856:const struct bpf_verifier_ops raw_tracepoint_writable_verifier_ops = {\nkernel/trace/bpf_trace.c-1857-\t.get_func_proto  = raw_tp_prog_func_proto,\n--\nkernel/trace/bpf_trace.c-1860-\nkernel/trace/bpf_trace.c:1861:const struct bpf_prog_ops raw_tracepoint_writable_prog_ops = {\nkernel/trace/bpf_trace.c-1862-};\n--\nkernel/trace/bpf_trace.c=2080=extern struct bpf_raw_event_map __stop__bpf_raw_tp[];\nkernel/trace/bpf_trace.c-2081-\nkernel/trace/bpf_trace.c:2082:struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)\nkernel/trace/bpf_trace.c-2083-{\n--\nkernel/trace/bpf_trace.c-2090-\nkernel/trace/bpf_trace.c:2091:\treturn bpf_get_raw_tracepoint_module(name);\nkernel/trace/bpf_trace.c-2092-}\nkernel/trace/bpf_trace.c-2093-\nkernel/trace/bpf_trace.c:2094:void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)\nkernel/trace/bpf_trace.c-2095-{\n--\ntools/bpf/bpftool/Documentation/bpftool-perf.rst=32=bpftool perf { show | list }\ntools/bpf/bpftool/Documentation/bpftool-perf.rst:33:    List all raw_tracepoint, tracepoint, kprobe attachment in the system.\ntools/bpf/bpftool/Documentation/bpftool-perf.rst-34-\n--\ntools/bpf/bpftool/Documentation/bpftool-perf.rst-36-    followed by bpf program id, attachment information, and attachment point.\ntools/bpf/bpftool/Documentation/bpftool-perf.rst:37:    The attachment point for raw_tracepoint/tracepoint is the trace probe name.\ntools/bpf/bpftool/Documentation/bpftool-perf.rst-38-    The attachment point for k[ret]probe is either symbol name and offset, or a\n--\ntools/bpf/bpftool/Documentation/bpftool-prog.rst=27=PROG COMMANDS\n--\ntools/bpf/bpftool/Documentation/bpftool-prog.rst-46-|     **socket** | **kprobe** | **kretprobe** | **classifier** | **action** |\ntools/bpf/bpftool/Documentation/bpftool-prog.rst:47:|     **tracepoint** | **raw_tracepoint** | **xdp** | **perf_event** | **cgroup/skb** |\ntools/bpf/bpftool/Documentation/bpftool-prog.rst-48-|     **cgroup/sock** | **cgroup/dev** | **lwt_in** | **lwt_out** | **lwt_xmit** |\n--\ntools/bpf/bpftool/bash-completion/bpftool=256=_bpftool()\n--\ntools/bpf/bpftool/bash-completion/bpftool-490-                                kretprobe classifier flow_dissector \\\ntools/bpf/bpftool/bash-completion/bpftool:491:                                action tracepoint raw_tracepoint \\\ntools/bpf/bpftool/bash-completion/bpftool-492-                                xdp perf_event cgroup/skb cgroup/sock \\\n--\ntools/bpf/bpftool/gen.c=562=static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)\n--\ntools/bpf/bpftool/gen.c-580-\t\t\ttp_name = strchr(bpf_program__section_name(prog), '/') + 1;\ntools/bpf/bpftool/gen.c:581:\t\t\tprintf(\"\\tint fd = skel_raw_tracepoint_open(\\\"%s\\\", prog_fd);\\n\", tp_name);\ntools/bpf/bpftool/gen.c-582-\t\t\tbreak;\n--\ntools/bpf/bpftool/gen.c-587-\t\t\telse\ntools/bpf/bpftool/gen.c:588:\t\t\t\tprintf(\"\\tint fd = skel_raw_tracepoint_open(NULL, prog_fd);\\n\");\ntools/bpf/bpftool/gen.c-589-\t\t\tbreak;\n--\ntools/bpf/bpftool/link.c=517=static int show_link_close_json(int fd, struct bpf_link_info *info)\n--\ntools/bpf/bpftool/link.c-529-\t\tjsonw_string_field(json_wtr, \"tp_name\",\ntools/bpf/bpftool/link.c:530:\t\t\t\t   u64_to_ptr(info-\u003eraw_tracepoint.tp_name));\ntools/bpf/bpftool/link.c:531:\t\tjsonw_uint_field(json_wtr, \"cookie\", info-\u003eraw_tracepoint.cookie);\ntools/bpf/bpftool/link.c-532-\t\tbreak;\n--\ntools/bpf/bpftool/link.c=918=static int show_link_close_plain(int fd, struct bpf_link_info *info)\n--\ntools/bpf/bpftool/link.c-928-\t\tprintf(\"\\n\\ttp '%s'  \",\ntools/bpf/bpftool/link.c:929:\t\t       (const char *)u64_to_ptr(info-\u003eraw_tracepoint.tp_name));\ntools/bpf/bpftool/link.c:930:\t\tif (info-\u003eraw_tracepoint.cookie)\ntools/bpf/bpftool/link.c:931:\t\t\tprintf(\"cookie %llu  \", info-\u003eraw_tracepoint.cookie);\ntools/bpf/bpftool/link.c-932-\t\tbreak;\n--\ntools/bpf/bpftool/link.c=1029=static int do_show_link(int fd)\n--\ntools/bpf/bpftool/link.c-1050-\tif (info.type == BPF_LINK_TYPE_RAW_TRACEPOINT \u0026\u0026\ntools/bpf/bpftool/link.c:1051:\t    !info.raw_tracepoint.tp_name) {\ntools/bpf/bpftool/link.c:1052:\t\tinfo.raw_tracepoint.tp_name = ptr_to_u64(\u0026buf);\ntools/bpf/bpftool/link.c:1053:\t\tinfo.raw_tracepoint.tp_name_len = sizeof(buf);\ntools/bpf/bpftool/link.c-1054-\t\tgoto again;\n--\ntools/bpf/bpftool/perf.c=65=static void print_perf_json(int pid, int fd, __u32 prog_id, __u32 fd_type,\n--\ntools/bpf/bpftool/perf.c-73-\tcase BPF_FD_TYPE_RAW_TRACEPOINT:\ntools/bpf/bpftool/perf.c:74:\t\tjsonw_string_field(json_wtr, \"fd_type\", \"raw_tracepoint\");\ntools/bpf/bpftool/perf.c-75-\t\tjsonw_string_field(json_wtr, \"tracepoint\", buf);\n--\ntools/bpf/bpftool/perf.c=115=static void print_perf_plain(int pid, int fd, __u32 prog_id, __u32 fd_type,\n--\ntools/bpf/bpftool/perf.c-120-\tcase BPF_FD_TYPE_RAW_TRACEPOINT:\ntools/bpf/bpftool/perf.c:121:\t\tprintf(\"raw_tracepoint  %s\\n\", buf);\ntools/bpf/bpftool/perf.c-122-\t\tbreak;\n--\ntools/bpf/bpftool/prog.c=2542=static int do_help(int argc, char **argv)\n--\ntools/bpf/bpftool/prog.c-2574-\t\t\"       TYPE := { socket | kprobe | kretprobe | classifier | action |\\n\"\ntools/bpf/bpftool/prog.c:2575:\t\t\"                 tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\\n\"\ntools/bpf/bpftool/prog.c-2576-\t\t\"                 cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\\n\"\n--\ntools/include/uapi/linux/bpf.h=1527=union bpf_attr {\n--\ntools/include/uapi/linux/bpf.h-1773-\t\t__aligned_u64\tcookie;\ntools/include/uapi/linux/bpf.h:1774:\t} raw_tracepoint;\ntools/include/uapi/linux/bpf.h-1775-\n--\ntools/include/uapi/linux/bpf.h-4292- * \t\tThis helper is similar to **bpf_perf_event_output**\\ () but\ntools/include/uapi/linux/bpf.h:4293: * \t\trestricted to raw_tracepoint bpf programs.\ntools/include/uapi/linux/bpf.h-4294- * \tReturn\n--\ntools/include/uapi/linux/bpf.h-4440- *\t\tThis helper is similar to **bpf_perf_eventoutput**\\ () but\ntools/include/uapi/linux/bpf.h:4441: *\t\trestricted to raw_tracepoint bpf programs.\ntools/include/uapi/linux/bpf.h-4442- *\tReturn\n--\ntools/include/uapi/linux/bpf.h=6763=struct bpf_link_info {\n--\ntools/include/uapi/linux/bpf.h-6772-\t\t\t__u64 cookie;\ntools/include/uapi/linux/bpf.h:6773:\t\t} raw_tracepoint;\ntools/include/uapi/linux/bpf.h-6774-\t\tstruct {\n--\ntools/include/uapi/linux/bpf.h=7309=struct bpf_cgroup_dev_ctx {\n--\ntools/include/uapi/linux/bpf.h-7315-\ntools/include/uapi/linux/bpf.h:7316:struct bpf_raw_tracepoint_args {\ntools/include/uapi/linux/bpf.h-7317-\t__u64 args[0];\n--\ntools/lib/bpf/bpf.c=782=int bpf_link_create(int prog_fd, int target_fd,\n--\ntools/lib/bpf/bpf.c-985-\tcase BPF_MODIFY_RETURN:\ntools/lib/bpf/bpf.c:986:\t\treturn bpf_raw_tracepoint_open(NULL, prog_fd);\ntools/lib/bpf/bpf.c-987-\tdefault:\n--\ntools/lib/bpf/bpf.c=1288=int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len)\n--\ntools/lib/bpf/bpf.c-1292-\ntools/lib/bpf/bpf.c:1293:int bpf_raw_tracepoint_open_opts(int prog_fd, struct bpf_raw_tp_opts *opts)\ntools/lib/bpf/bpf.c-1294-{\ntools/lib/bpf/bpf.c:1295:\tconst size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint);\ntools/lib/bpf/bpf.c-1296-\tunion bpf_attr attr;\n--\ntools/lib/bpf/bpf.c-1302-\tmemset(\u0026attr, 0, attr_sz);\ntools/lib/bpf/bpf.c:1303:\tattr.raw_tracepoint.prog_fd = prog_fd;\ntools/lib/bpf/bpf.c:1304:\tattr.raw_tracepoint.name = ptr_to_u64(OPTS_GET(opts, tp_name, NULL));\ntools/lib/bpf/bpf.c:1305:\tattr.raw_tracepoint.cookie = OPTS_GET(opts, cookie, 0);\ntools/lib/bpf/bpf.c-1306-\n--\ntools/lib/bpf/bpf.c-1310-\ntools/lib/bpf/bpf.c:1311:int bpf_raw_tracepoint_open(const char *name, int prog_fd)\ntools/lib/bpf/bpf.c-1312-{\n--\ntools/lib/bpf/bpf.c-1314-\ntools/lib/bpf/bpf.c:1315:\treturn bpf_raw_tracepoint_open_opts(prog_fd, \u0026opts);\ntools/lib/bpf/bpf.c-1316-}\n--\ntools/lib/bpf/bpf.h=661=struct bpf_raw_tp_opts {\n--\ntools/lib/bpf/bpf.h-668-\ntools/lib/bpf/bpf.h:669:LIBBPF_API int bpf_raw_tracepoint_open_opts(int prog_fd, struct bpf_raw_tp_opts *opts);\ntools/lib/bpf/bpf.h:670:LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd);\ntools/lib/bpf/bpf.h-671-LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,\n--\ntools/lib/bpf/libbpf.c=144=static const char * const link_type_name[] = {\ntools/lib/bpf/libbpf.c-145-\t[BPF_LINK_TYPE_UNSPEC]\t\t\t= \"unspec\",\ntools/lib/bpf/libbpf.c:146:\t[BPF_LINK_TYPE_RAW_TRACEPOINT]\t\t= \"raw_tracepoint\",\ntools/lib/bpf/libbpf.c-147-\t[BPF_LINK_TYPE_TRACING]\t\t\t= \"tracing\",\n--\ntools/lib/bpf/libbpf.c=202=static const char * const prog_type_name[] = {\n--\ntools/lib/bpf/libbpf.c-219-\t[BPF_PROG_TYPE_SK_MSG]\t\t\t= \"sk_msg\",\ntools/lib/bpf/libbpf.c:220:\t[BPF_PROG_TYPE_RAW_TRACEPOINT]\t\t= \"raw_tracepoint\",\ntools/lib/bpf/libbpf.c-221-\t[BPF_PROG_TYPE_CGROUP_SOCK_ADDR]\t= \"cgroup_sock_addr\",\n--\ntools/lib/bpf/libbpf.c-226-\t[BPF_PROG_TYPE_CGROUP_SYSCTL]\t\t= \"cgroup_sysctl\",\ntools/lib/bpf/libbpf.c:227:\t[BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE]\t= \"raw_tracepoint_writable\",\ntools/lib/bpf/libbpf.c-228-\t[BPF_PROG_TYPE_CGROUP_SOCKOPT]\t\t= \"cgroup_sockopt\",\n--\ntools/lib/bpf/libbpf.c=7113=static struct {\n--\ntools/lib/bpf/libbpf.c-7130-\t{ BPF_PROG_TYPE_PERF_EVENT,              \"bpf_perf_event_data\" },\ntools/lib/bpf/libbpf.c:7131:\t{ BPF_PROG_TYPE_RAW_TRACEPOINT,          \"bpf_raw_tracepoint_args\" },\ntools/lib/bpf/libbpf.c:7132:\t{ BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, \"bpf_raw_tracepoint_args\" },\ntools/lib/bpf/libbpf.c-7133-\t{ BPF_PROG_TYPE_SCHED_ACT,               \"__sk_buff\" },\n--\ntools/lib/bpf/libbpf.c=10076=static const struct bpf_sec_def section_defs[] = {\n--\ntools/lib/bpf/libbpf.c-10111-\tSEC_DEF(\"tp.s+\",\t\tTRACEPOINT, 0, SEC_SLEEPABLE, attach_tp),\ntools/lib/bpf/libbpf.c:10112:\tSEC_DEF(\"raw_tracepoint+\",\tRAW_TRACEPOINT, 0, SEC_NONE, attach_raw_tp),\ntools/lib/bpf/libbpf.c-10113-\tSEC_DEF(\"raw_tp+\",\t\tRAW_TRACEPOINT, 0, SEC_NONE, attach_raw_tp),\ntools/lib/bpf/libbpf.c:10114:\tSEC_DEF(\"raw_tracepoint.s+\",\tRAW_TRACEPOINT, 0, SEC_SLEEPABLE, attach_raw_tp),\ntools/lib/bpf/libbpf.c-10115-\tSEC_DEF(\"raw_tp.s+\",\t\tRAW_TRACEPOINT, 0, SEC_SLEEPABLE, attach_raw_tp),\ntools/lib/bpf/libbpf.c:10116:\tSEC_DEF(\"raw_tracepoint.w+\",\tRAW_TRACEPOINT_WRITABLE, 0, SEC_NONE, attach_raw_tp),\ntools/lib/bpf/libbpf.c-10117-\tSEC_DEF(\"raw_tp.w+\",\t\tRAW_TRACEPOINT_WRITABLE, 0, SEC_NONE, attach_raw_tp),\n--\ntools/lib/bpf/libbpf.c=13596=struct bpf_link *\ntools/lib/bpf/libbpf.c:13597:bpf_program__attach_raw_tracepoint_opts(const struct bpf_program *prog,\ntools/lib/bpf/libbpf.c-13598-\t\t\t\t\tconst char *tp_name,\ntools/lib/bpf/libbpf.c:13599:\t\t\t\t\tstruct bpf_raw_tracepoint_opts *opts)\ntools/lib/bpf/libbpf.c-13600-{\n--\ntools/lib/bpf/libbpf.c-13604-\ntools/lib/bpf/libbpf.c:13605:\tif (!OPTS_VALID(opts, bpf_raw_tracepoint_opts))\ntools/lib/bpf/libbpf.c-13606-\t\treturn libbpf_err_ptr(-EINVAL);\n--\ntools/lib/bpf/libbpf.c-13620-\traw_opts.cookie = OPTS_GET(opts, cookie, 0);\ntools/lib/bpf/libbpf.c:13621:\tpfd = bpf_raw_tracepoint_open_opts(prog_fd, \u0026raw_opts);\ntools/lib/bpf/libbpf.c-13622-\tif (pfd \u003c 0) {\n--\ntools/lib/bpf/libbpf.c-13632-\ntools/lib/bpf/libbpf.c:13633:struct bpf_link *bpf_program__attach_raw_tracepoint(const struct bpf_program *prog,\ntools/lib/bpf/libbpf.c-13634-\t\t\t\t\t\t    const char *tp_name)\ntools/lib/bpf/libbpf.c-13635-{\ntools/lib/bpf/libbpf.c:13636:\treturn bpf_program__attach_raw_tracepoint_opts(prog, tp_name, NULL);\ntools/lib/bpf/libbpf.c-13637-}\n--\ntools/lib/bpf/libbpf.c=13639=static int attach_raw_tp(const struct bpf_program *prog, long cookie, struct bpf_link **link)\n--\ntools/lib/bpf/libbpf.c-13642-\t\t\"raw_tp\",\ntools/lib/bpf/libbpf.c:13643:\t\t\"raw_tracepoint\",\ntools/lib/bpf/libbpf.c-13644-\t\t\"raw_tp.w\",\ntools/lib/bpf/libbpf.c:13645:\t\t\"raw_tracepoint.w\",\ntools/lib/bpf/libbpf.c-13646-\t\t\"raw_tp.s\",\ntools/lib/bpf/libbpf.c:13647:\t\t\"raw_tracepoint.s\",\ntools/lib/bpf/libbpf.c-13648-\t};\n--\ntools/lib/bpf/libbpf.c-13660-\ntools/lib/bpf/libbpf.c:13661:\t*link = bpf_program__attach_raw_tracepoint(prog, match);\ntools/lib/bpf/libbpf.c-13662-\treturn libbpf_get_error(*link);\n--\ntools/lib/bpf/libbpf.c=13884=struct bpf_link *bpf_program__attach_freplace(const struct bpf_program *prog,\n--\ntools/lib/bpf/libbpf.c-13913-\t} else {\ntools/lib/bpf/libbpf.c:13914:\t\t/* no target, so use raw_tracepoint_open for compatibility\ntools/lib/bpf/libbpf.c-13915-\t\t * with old kernels\n--\ntools/lib/bpf/libbpf.h=853=bpf_program__attach_tracepoint_opts(const struct bpf_program *prog,\n--\ntools/lib/bpf/libbpf.h-857-\ntools/lib/bpf/libbpf.h:858:struct bpf_raw_tracepoint_opts {\ntools/lib/bpf/libbpf.h-859-\tsize_t sz; /* size of this struct for forward/backward compatibility */\n--\ntools/lib/bpf/libbpf.h-862-};\ntools/lib/bpf/libbpf.h:863:#define bpf_raw_tracepoint_opts__last_field cookie\ntools/lib/bpf/libbpf.h-864-\ntools/lib/bpf/libbpf.h=865=LIBBPF_API struct bpf_link *\ntools/lib/bpf/libbpf.h:866:bpf_program__attach_raw_tracepoint(const struct bpf_program *prog,\ntools/lib/bpf/libbpf.h-867-\t\t\t\t   const char *tp_name);\ntools/lib/bpf/libbpf.h=868=LIBBPF_API struct bpf_link *\ntools/lib/bpf/libbpf.h:869:bpf_program__attach_raw_tracepoint_opts(const struct bpf_program *prog,\ntools/lib/bpf/libbpf.h-870-\t\t\t\t\tconst char *tp_name,\ntools/lib/bpf/libbpf.h:871:\t\t\t\t\tstruct bpf_raw_tracepoint_opts *opts);\ntools/lib/bpf/libbpf.h-872-\n--\ntools/lib/bpf/libbpf.map=1=LIBBPF_0.0.1 {\n--\ntools/lib/bpf/libbpf.map-51-\t\tbpf_prog_linfo__lfind;\ntools/lib/bpf/libbpf.map:52:\t\tbpf_raw_tracepoint_open;\ntools/lib/bpf/libbpf.map-53-\t\tbpf_task_fd_query;\n--\ntools/lib/bpf/libbpf.map=88=LIBBPF_0.0.4 {\n--\ntools/lib/bpf/libbpf.map-92-\t\tbpf_program__attach_perf_event;\ntools/lib/bpf/libbpf.map:93:\t\tbpf_program__attach_raw_tracepoint;\ntools/lib/bpf/libbpf.map-94-\t\tbpf_program__attach_tracepoint;\n--\ntools/lib/bpf/libbpf.map=411=LIBBPF_1.4.0 {\ntools/lib/bpf/libbpf.map-412-\tglobal:\ntools/lib/bpf/libbpf.map:413:\t\tbpf_program__attach_raw_tracepoint_opts;\ntools/lib/bpf/libbpf.map:414:\t\tbpf_raw_tracepoint_open_opts;\ntools/lib/bpf/libbpf.map-415-\t\tbpf_token_create;\n--\ntools/lib/bpf/skel_internal.h=286=static inline int skel_map_get_fd_by_id(__u32 id)\n--\ntools/lib/bpf/skel_internal.h-296-\ntools/lib/bpf/skel_internal.h:297:static inline int skel_raw_tracepoint_open(const char *name, int prog_fd)\ntools/lib/bpf/skel_internal.h-298-{\ntools/lib/bpf/skel_internal.h:299:\tconst size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint.prog_fd);\ntools/lib/bpf/skel_internal.h-300-\tunion bpf_attr attr;\n--\ntools/lib/bpf/skel_internal.h-302-\tmemset(\u0026attr, 0, attr_sz);\ntools/lib/bpf/skel_internal.h:303:\tattr.raw_tracepoint.name = (long) name;\ntools/lib/bpf/skel_internal.h:304:\tattr.raw_tracepoint.prog_fd = prog_fd;\ntools/lib/bpf/skel_internal.h-305-\n--\ntools/perf/util/bpf_ftrace.c=22=int perf_ftrace__latency_prepare_bpf(struct perf_ftrace *ftrace)\n--\ntools/perf/util/bpf_ftrace.c-129-\ntools/perf/util/bpf_ftrace.c:130:\t\tskel-\u003elinks.event_begin = bpf_program__attach_raw_tracepoint(skel-\u003eprogs.event_begin,\ntools/perf/util/bpf_ftrace.c-131-\t\t\t\t\t\t\t\t\t     event-\u003ename);\n--\ntools/perf/util/bpf_ftrace.c-139-\ntools/perf/util/bpf_ftrace.c:140:\t\tskel-\u003elinks.event_end = bpf_program__attach_raw_tracepoint(skel-\u003eprogs.event_end,\ntools/perf/util/bpf_ftrace.c-141-\t\t\t\t\t\t\t\t\t     event-\u003ename);\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c=615=static void tp_btf_subtest(struct test_bpf_cookie *skel)\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-632-\traw_tp_opts.cookie = cookie = 0x11000000000000L;\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c:633:\tlink_fd = bpf_raw_tracepoint_open_opts(prog_fd, \u0026raw_tp_opts);\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c:634:\tif (!ASSERT_GE(link_fd, 0, \"bpf_raw_tracepoint_open_opts\"))\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-635-\t\tgoto cleanup;\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c=677=static int verify_raw_tp_link_info(int fd, u64 cookie)\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-690-\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c:691:\tASSERT_EQ(info.raw_tracepoint.cookie, cookie, \"raw_tp_cookie\");\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-692-\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c=696=static void raw_tp_subtest(struct test_bpf_cookie *skel)\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-701-\tLIBBPF_OPTS(bpf_raw_tp_opts, raw_tp_opts);\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c:702:\tLIBBPF_OPTS(bpf_raw_tracepoint_opts, opts);\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-703-\n--\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-711-\traw_tp_opts.cookie = cookie = 0x55000000000000L;\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c:712:\tlink_fd = bpf_raw_tracepoint_open_opts(prog_fd, \u0026raw_tp_opts);\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c:713:\tif (!ASSERT_GE(link_fd, 0, \"bpf_raw_tracepoint_open_opts\"))\ntools/testing/selftests/bpf/prog_tests/bpf_cookie.c-714-\t\tgoto cleanup;\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 19388
							output: 30
							thoughts: 49
						

Okay, here's my interpretation of those thoughts, framed as my own:

**Analyzing a Raw Tracepoint Test**

Alright, I'm looking at this test, and it's using `SEC("raw_tracepoint.w")`. Right, that means we're dealing with `BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE`. My initial instinct is to dig a little deeper. Given the nature of this program type, I should probably check the configuration files or any relevant documentation related to raw tracepoints and writable programs. I'm keen to understand if there are any specific settings or parameters that are relevant to this particular setup. I'll need to make sure I'm across any specific configuration requirements or potential limitations. It's a key first step, so I'll see what I can find.

{
  "Expression": "BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE"
}

{
  "Output": "Documentation/bpf/libbpf/program_types.rst=18=described in more detail in the footnotes.\n--\nDocumentation/bpf/libbpf/program_types.rst-143-+-------------------------------------------+----------------------------------------+----------------------------------+-----------+\nDocumentation/bpf/libbpf/program_types.rst:144:| ``BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE`` |                                        | ``raw_tp.w+`` [#rawtp]_          |           |\nDocumentation/bpf/libbpf/program_types.rst-145-+                                           +                                        +----------------------------------+-----------+\n--\ninclude/linux/bpf_types.h=45=BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT, raw_tracepoint,\ninclude/linux/bpf_types.h-46-\t      struct bpf_raw_tracepoint_args, u64)\ninclude/linux/bpf_types.h:47:BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, raw_tracepoint_writable,\ninclude/linux/bpf_types.h-48-\t      struct bpf_raw_tracepoint_args, u64)\n--\ninclude/uapi/linux/bpf.h=132=union bpf_iter_link_info {\n--\ninclude/uapi/linux/bpf.h-386- *\t\t**BPF_PROG_TYPE_RAW_TRACEPOINT**,\ninclude/uapi/linux/bpf.h:387: *\t\t**BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE**\ninclude/uapi/linux/bpf.h-388- *\n--\ninclude/uapi/linux/bpf.h=1062=enum bpf_prog_type {\n--\ninclude/uapi/linux/bpf.h-1086-\tBPF_PROG_TYPE_CGROUP_SYSCTL,\ninclude/uapi/linux/bpf.h:1087:\tBPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE,\ninclude/uapi/linux/bpf.h-1088-\tBPF_PROG_TYPE_CGROUP_SOCKOPT,\n--\nkernel/bpf/btf.c=6216=static int btf_validate_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,\n--\nkernel/bpf/btf.c-6273-\tcase BPF_PROG_TYPE_RAW_TRACEPOINT:\nkernel/bpf/btf.c:6274:\tcase BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:\nkernel/bpf/btf.c-6275-\t\t/* allow u64* as ctx */\n--\nkernel/bpf/syscall.c=2871=static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)\n--\nkernel/bpf/syscall.c-2877-\tcase BPF_PROG_TYPE_RAW_TRACEPOINT:\nkernel/bpf/syscall.c:2878:\tcase BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:\nkernel/bpf/syscall.c-2879-\tcase BPF_PROG_TYPE_TRACING:\n--\nkernel/bpf/syscall.c=4352=static int bpf_raw_tp_link_attach(struct bpf_prog *prog,\n--\nkernel/bpf/syscall.c-4378-\tcase BPF_PROG_TYPE_RAW_TRACEPOINT:\nkernel/bpf/syscall.c:4379:\tcase BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:\nkernel/bpf/syscall.c-4380-\t\tif (strncpy_from_user(buf, user_tp_name, sizeof(buf) - 1) \u003c 0)\n--\nkernel/bpf/verifier.c=17726=static bool is_tracing_prog_type(enum bpf_prog_type type)\n--\nkernel/bpf/verifier.c-17732-\tcase BPF_PROG_TYPE_RAW_TRACEPOINT:\nkernel/bpf/verifier.c:17733:\tcase BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:\nkernel/bpf/verifier.c-17734-\t\treturn true;\n--\ntools/include/uapi/linux/bpf.h=132=union bpf_iter_link_info {\n--\ntools/include/uapi/linux/bpf.h-386- *\t\t**BPF_PROG_TYPE_RAW_TRACEPOINT**,\ntools/include/uapi/linux/bpf.h:387: *\t\t**BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE**\ntools/include/uapi/linux/bpf.h-388- *\n--\ntools/include/uapi/linux/bpf.h=1062=enum bpf_prog_type {\n--\ntools/include/uapi/linux/bpf.h-1086-\tBPF_PROG_TYPE_CGROUP_SYSCTL,\ntools/include/uapi/linux/bpf.h:1087:\tBPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE,\ntools/include/uapi/linux/bpf.h-1088-\tBPF_PROG_TYPE_CGROUP_SOCKOPT,\n--\ntools/lib/bpf/libbpf.c=202=static const char * const prog_type_name[] = {\n--\ntools/lib/bpf/libbpf.c-226-\t[BPF_PROG_TYPE_CGROUP_SYSCTL]\t\t= \"cgroup_sysctl\",\ntools/lib/bpf/libbpf.c:227:\t[BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE]\t= \"raw_tracepoint_writable\",\ntools/lib/bpf/libbpf.c-228-\t[BPF_PROG_TYPE_CGROUP_SOCKOPT]\t\t= \"cgroup_sockopt\",\n--\ntools/lib/bpf/libbpf.c=7113=static struct {\n--\ntools/lib/bpf/libbpf.c-7131-\t{ BPF_PROG_TYPE_RAW_TRACEPOINT,          \"bpf_raw_tracepoint_args\" },\ntools/lib/bpf/libbpf.c:7132:\t{ BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, \"bpf_raw_tracepoint_args\" },\ntools/lib/bpf/libbpf.c-7133-\t{ BPF_PROG_TYPE_SCHED_ACT,               \"__sk_buff\" },\n--\ntools/lib/bpf/libbpf.c=7153=static bool need_func_arg_type_fixup(const struct btf *btf, const struct bpf_program *prog,\n--\ntools/lib/bpf/libbpf.c-7208-\tcase BPF_PROG_TYPE_RAW_TRACEPOINT:\ntools/lib/bpf/libbpf.c:7209:\tcase BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:\ntools/lib/bpf/libbpf.c-7210-\t\t/* allow u64* as ctx */\n--\ntools/lib/bpf/libbpf_probes.c=103=static int probe_prog_load(enum bpf_prog_type prog_type,\n--\ntools/lib/bpf/libbpf_probes.c-177-\tcase BPF_PROG_TYPE_RAW_TRACEPOINT:\ntools/lib/bpf/libbpf_probes.c:178:\tcase BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:\ntools/lib/bpf/libbpf_probes.c-179-\tcase BPF_PROG_TYPE_LWT_SEG6LOCAL:\n--\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_reject_nbd_invalid.c=7=void test_raw_tp_writable_reject_nbd_invalid(void)\n--\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_reject_nbd_invalid.c-27-\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_reject_nbd_invalid.c:28:\tbpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, \"GPL v2\",\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_reject_nbd_invalid.c-29-\t\t\t       program, ARRAY_SIZE(program),\n--\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_test_run.c=8=void serial_test_raw_tp_writable_test_run(void)\n--\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_test_run.c-26-\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_test_run.c:27:\tint bpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, \"GPL v2\",\ntools/testing/selftests/bpf/prog_tests/raw_tp_writable_test_run.c-28-\t\t\t\t   trace_program, ARRAY_SIZE(trace_program),\n"
}

gemini-3.1-pro-preview

null

null

							input: 22083
							output: 19
							thoughts: 31
						

Okay, here's my take on those thoughts, framed as my own mental process, given my expertise:

**Checking BPF_EVENTS Dependencies**

Right, so we're looking at `BPF_SYSCALL` and `BPF_EVENTS`. The interesting one here is `BPF_EVENTS`. My immediate instinct is to map out the dependency graph for `BPF_EVENTS`. It's a key part of the BPF ecosystem, so understanding what it leans on is crucial. I need to make sure I know what other configurations and kernel features are needed for it to function correctly. This is just a preliminary assessment. I can use this information to determine the most direct path. I need to ensure it's built correctly.

{
  "Expression": "config BPF_EVENTS"
}

{
  "Output": "kernel/trace/Kconfig=839=config EPROBE_EVENTS\n--\nkernel/trace/Kconfig-852-\nkernel/trace/Kconfig:853:config BPF_EVENTS\nkernel/trace/Kconfig-854-\tdepends on BPF_SYSCALL\n"
}

gemini-3.1-pro-preview

null

null

							input: 22370
							output: 128
							thoughts: 120
						

Okay, here's my summary, considering my expertise:

**My BPF Implementation Strategy**

Right, it seems we're on the right track. From my understanding of the system, I can confirm that focusing our efforts on the `BPF_SYSCALL` and `BPF_EVENTS` aspects will be sufficient for this specific task. We want to be efficient and pinpoint where we need to make changes.

Now, let's zero in on those key symbol functions. I need to take a look at `__check_buffer_access`, `check_tp_buffer_access`, and `check_buffer_access` to confirm the code will function as intended.

I quickly checked the list and confirmed that while `check_max_stack_depth` isn't impacted, `check_buffer_access`, `check_tp_buffer_access` and `__check_buffer_access` are all modified, as expected.

I will proceed to set the results accordingly.

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS"
  ],
  "FocusSymbols": [
    "__check_buffer_access",
    "check_tp_buffer_access",
    "check_buffer_access"
  ],
  "Reasoning": "The patch modifies the BPF verifier to correctly handle negative offsets and overflows when checking buffer access in BPF programs. This is a functional change in a core kernel component (BPF verifier) and should be fuzzed to ensure no regressions or new vulnerabilities are introduced.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS"
  ],
  "FocusSymbols": [
    "__check_buffer_access",
    "check_tp_buffer_access",
    "check_buffer_access"
  ],
  "Reasoning": "The patch modifies the BPF verifier to correctly handle negative offsets and overflows when checking buffer access in BPF programs. This is a functional change in a core kernel component (BPF verifier) and should be fuzzed to ensure no regressions or new vulnerabilities are introduced.",
  "WorthFuzzing": true
}