AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/07/10 13:44 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not alter functional kernel code.",
  "WorthFuzzing": false
}
1/1 2026/07/10 13:44 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit d0abb52135a17be9a855b44b7cb6bdfcb064a073\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Fri Jul 10 13:44:27 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/kvm/x86/sev_init2_tests.c b/tools/testing/selftests/kvm/x86/sev_init2_tests.c\nindex 8db88c355f1654..7663418b3fa846 100644\n--- a/tools/testing/selftests/kvm/x86/sev_init2_tests.c\n+++ b/tools/testing/selftests/kvm/x86/sev_init2_tests.c\n@@ -6,6 +6,7 @@\n #include \u003cstdlib.h\u003e\n #include \u003cerrno.h\u003e\n #include \u003cpthread.h\u003e\n+#include \u003cunistd.h\u003e\n \n #include \"test_util.h\"\n #include \"kvm_util.h\"\n@@ -73,19 +74,34 @@ static void test_init2_invalid(unsigned long vm_type, struct kvm_sev_init *init,\n \tkvm_vm_free(vm);\n }\n \n+static void test_create_invalid_type(unsigned long vm_type, const char *msg)\n+{\n+\tint fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, (void *)vm_type);\n+\tint err = errno;\n+\n+\t/* Clean up before asserting; TEST_ASSERT() aborts on failure. */\n+\tif (fd \u003e= 0)\n+\t\tclose(fd);\n+\n+\tTEST_ASSERT(fd \u003c 0 \u0026\u0026 err == EINVAL,\n+\t\t    \"KVM_CREATE_VM should reject unsupported type (%s), got fd=%d errno=%d\",\n+\t\t    msg, fd, err);\n+}\n+\n void test_vm_types(void)\n {\n \ttest_init2(KVM_X86_SEV_VM, \u0026(struct kvm_sev_init){});\n \n-\t/*\n-\t * TODO: check that unsupported types cannot be created.  Probably\n-\t * a separate selftest.\n-\t */\n+\t/* Unsupported types must be rejected by KVM_CREATE_VM itself. */\n \tif (have_sev_es)\n \t\ttest_init2(KVM_X86_SEV_ES_VM, \u0026(struct kvm_sev_init){});\n+\telse\n+\t\ttest_create_invalid_type(KVM_X86_SEV_ES_VM, \"SEV-ES is unsupported\");\n \n \tif (have_snp)\n \t\ttest_init2(KVM_X86_SNP_VM, \u0026(struct kvm_sev_init){});\n+\telse\n+\t\ttest_create_invalid_type(KVM_X86_SNP_VM, \"SEV-SNP is unsupported\");\n \n \ttest_init2_invalid(0, \u0026(struct kvm_sev_init){},\n \t\t\t   \"VM type is KVM_X86_DEFAULT_VM\");\n@@ -121,9 +137,10 @@ void test_features(u32 vm_type, u64 supported_features)\n \n int main(int argc, char *argv[])\n {\n-\tint kvm_fd = open_kvm_dev_path_or_exit();\n \tbool have_sev;\n \n+\tkvm_fd = open_kvm_dev_path_or_exit();\n+\n \tTEST_REQUIRE(__kvm_has_device_attr(kvm_fd, KVM_X86_GRP_SEV,\n \t\t\t\t\t   KVM_X86_SEV_VMSA_FEATURES) == 0);\n \tkvm_device_attr_get(kvm_fd, KVM_X86_GRP_SEV,\ndiff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c\nindex 6b2cbe2a90b7c5..9ce465b4a770b4 100644\n--- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c\n+++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c\n@@ -150,16 +150,35 @@ static void test_sync_vmsa(u32 type, u64 policy)\n \tkvm_vm_free(vm);\n }\n \n+static bool is_measurement_nonzero(const u8 *measurement, size_t len)\n+{\n+\tsize_t i;\n+\n+\tfor (i = 0; i \u003c len; i++)\n+\t\tif (measurement[i])\n+\t\t\treturn true;\n+\n+\treturn false;\n+}\n+\n static void test_sev(void *guest_code, u32 type, u64 policy)\n {\n+\tu8 measurement[256];\n \tstruct kvm_vcpu *vcpu;\n \tstruct kvm_vm *vm;\n \tstruct ucall uc;\n \n \tvm = vm_sev_create_with_one_vcpu(type, guest_code, \u0026vcpu);\n \n-\t/* TODO: Validate the measurement is as expected. */\n-\tvm_sev_launch(vm, policy, NULL);\n+\t/* Sanity check the measurement; SNP has no measurement here. */\n+\tif (is_sev_snp_vm(vm)) {\n+\t\tvm_sev_launch(vm, policy, NULL);\n+\t} else {\n+\t\tmemset(measurement, 0, sizeof(measurement));\n+\t\tvm_sev_launch(vm, policy, measurement);\n+\t\tTEST_ASSERT(is_measurement_nonzero(measurement, sizeof(measurement)),\n+\t\t\t    \"SEV launch measurement is unexpectedly all zeros\");\n+\t}\n \n \tfor (;;) {\n \t\tvcpu_run(vcpu);\n"
}
2/1 2026/07/10 13:44 agent patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not alter functional kernel code.",
  "WorthFuzzing": false
}

Instruction: 
You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Prompt: 
For your convenience, here is the diff of the changes:
commit d0abb52135a17be9a855b44b7cb6bdfcb064a073
Author: syz-cluster <triage@syzkaller.com>
Date:   Fri Jul 10 13:44:27 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/kvm/x86/sev_init2_tests.c b/tools/testing/selftests/kvm/x86/sev_init2_tests.c
index 8db88c355f1654..7663418b3fa846 100644
--- a/tools/testing/selftests/kvm/x86/sev_init2_tests.c
+++ b/tools/testing/selftests/kvm/x86/sev_init2_tests.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <pthread.h>
+#include <unistd.h>
 
 #include "test_util.h"
 #include "kvm_util.h"
@@ -73,19 +74,34 @@ static void test_init2_invalid(unsigned long vm_type, struct kvm_sev_init *init,
 	kvm_vm_free(vm);
 }
 
+static void test_create_invalid_type(unsigned long vm_type, const char *msg)
+{
+	int fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, (void *)vm_type);
+	int err = errno;
+
+	/* Clean up before asserting; TEST_ASSERT() aborts on failure. */
+	if (fd >= 0)
+		close(fd);
+
+	TEST_ASSERT(fd < 0 && err == EINVAL,
+		    "KVM_CREATE_VM should reject unsupported type (%s), got fd=%d errno=%d",
+		    msg, fd, err);
+}
+
 void test_vm_types(void)
 {
 	test_init2(KVM_X86_SEV_VM, &(struct kvm_sev_init){});
 
-	/*
-	 * TODO: check that unsupported types cannot be created.  Probably
-	 * a separate selftest.
-	 */
+	/* Unsupported types must be rejected by KVM_CREATE_VM itself. */
 	if (have_sev_es)
 		test_init2(KVM_X86_SEV_ES_VM, &(struct kvm_sev_init){});
+	else
+		test_create_invalid_type(KVM_X86_SEV_ES_VM, "SEV-ES is unsupported");
 
 	if (have_snp)
 		test_init2(KVM_X86_SNP_VM, &(struct kvm_sev_init){});
+	else
+		test_create_invalid_type(KVM_X86_SNP_VM, "SEV-SNP is unsupported");
 
 	test_init2_invalid(0, &(struct kvm_sev_init){},
 			   "VM type is KVM_X86_DEFAULT_VM");
@@ -121,9 +137,10 @@ void test_features(u32 vm_type, u64 supported_features)
 
 int main(int argc, char *argv[])
 {
-	int kvm_fd = open_kvm_dev_path_or_exit();
 	bool have_sev;
 
+	kvm_fd = open_kvm_dev_path_or_exit();
+
 	TEST_REQUIRE(__kvm_has_device_attr(kvm_fd, KVM_X86_GRP_SEV,
 					   KVM_X86_SEV_VMSA_FEATURES) == 0);
 	kvm_device_attr_get(kvm_fd, KVM_X86_GRP_SEV,
diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
index 6b2cbe2a90b7c5..9ce465b4a770b4 100644
--- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c
+++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
@@ -150,16 +150,35 @@ static void test_sync_vmsa(u32 type, u64 policy)
 	kvm_vm_free(vm);
 }
 
+static bool is_measurement_nonzero(const u8 *measurement, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		if (measurement[i])
+			return true;
+
+	return false;
+}
+
 static void test_sev(void *guest_code, u32 type, u64 policy)
 {
+	u8 measurement[256];
 	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	struct ucall uc;
 
 	vm = vm_sev_create_with_one_vcpu(type, guest_code, &vcpu);
 
-	/* TODO: Validate the measurement is as expected. */
-	vm_sev_launch(vm, policy, NULL);
+	/* Sanity check the measurement; SNP has no measurement here. */
+	if (is_sev_snp_vm(vm)) {
+		vm_sev_launch(vm, policy, NULL);
+	} else {
+		memset(measurement, 0, sizeof(measurement));
+		vm_sev_launch(vm, policy, measurement);
+		TEST_ASSERT(is_measurement_nonzero(measurement, sizeof(measurement)),
+			    "SEV launch measurement is unexpectedly all zeros");
+	}
 
 	for (;;) {
 		vcpu_run(vcpu);

3/2 2026/07/10 13:44 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3071
							output: 64
							thoughts: 64

Thoughts: 
**WorthFuzzing=False: A Quick Assessment**

Alright, looking at this patch, I'm immediately noticing it's playing around in `tools/testing/selftests/kvm/x86/`. Selftests, not the core kernel. That's the key here. This isn't touching any of the actual kernel functionality that we'd want to fuzz for vulnerabilities. It's essentially test infrastructure, and even if there were issues here, they wouldn't directly translate into exploitable flaws in the running system. No functional kernel changes, no fuzzing required. WorthFuzzing=false, simple as that.

4/2 2026/07/10 13:44 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not alter functional kernel code.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not alter functional kernel code.",
  "WorthFuzzing": false
}
LLM Calls Summary:
Total Calls Total Tokens Avg Tokens Total Duration (Seconds) Avg Duration (Seconds)
Tool Calls Summary:
Total Calls Total Duration (Seconds) Avg Duration (Seconds)