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* [PATCH i-g-t v2] tests/intel/gem_exec_params: add invalid-offset-multiple-buffers test
@ 2026-08-19 15:21 Krzysztof Niemiec
  2026-08-19 20:04 ` ✓ Xe.CI.BAT: success for tests/intel/gem_exec_params: add invalid-offset-multiple-buffers test (rev2) Patchwork
                   ` (5 more replies)
  0 siblings, 6 replies; 8+ messages in thread
From: Krzysztof Niemiec @ 2026-08-19 15:21 UTC (permalink / raw)
  To: igt-dev
  Cc: Kamil Konieczny, Krzysztof Karas, Sebastian Brzezinka,
	Janusz Krzysztofik, Andi Shyti, Krzysztof Niemiec

Add coverage for the case where the batch start offset is invalid with
multiple BOs submitted, which was buggy in the kernel until 4fe2bd195435
("drm/i915/gem: Zero-initialize the eb.vma array in i915_gem_do_execbuffer")

Signed-off-by: Krzysztof Niemiec <krzysztof.niemiec@intel.com>
---

v2:
 - Reword comments to be more specific (Krzysztof K, Sebastian)
 - Get rid of the context id parameter (previously set in rsvd2, which
   should have been rsvd1) - which turns out isn't actually required to
   trigger the correct error path (Sebastian)
 - Capitalize sentences (Andi, off-list)

 tests/intel/gem_exec_params.c | 50 +++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/tests/intel/gem_exec_params.c b/tests/intel/gem_exec_params.c
index 3ba4c530b..c405190a0 100644
--- a/tests/intel/gem_exec_params.c
+++ b/tests/intel/gem_exec_params.c
@@ -85,6 +85,8 @@
  *
  * SUBTEST: invalid-flag
  *
+ * SUBTEST: invalid-offset-multiple-buffers
+ *
  * SUBTEST: invalid-ring
  *
  * SUBTEST: invalid-ring2
@@ -404,6 +406,51 @@ static void test_invalid_batch_start(int fd)
 	gem_close(fd, exec.handle);
 }
 
+/*
+ * This test is checking for a NULL deref in eb_release_vmas()
+ * (see 4fe2bd195435 for kernel fix), which happens when multiple buffers
+ * are submitted to the execbuf ioctl and some of them are invalid.
+ *
+ * The __gem_execbuf() call is always expected to fail with an -EINVAL,
+ * because the bug mentioned above is in the error path, which is
+ * deliberately triggered. Affected systems, however, will not handle it
+ * cleanly and will crash with a NULL deref.
+ */
+
+static void test_invalid_offset_multiple_buffers(int fd)
+{
+	struct drm_i915_gem_exec_object2 exec[2];
+	struct drm_i915_gem_execbuffer2 execbuf;
+	uint32_t size = 0x1000;
+
+	memset(exec, 0, sizeof(exec));
+	memset(&execbuf, 0, sizeof(execbuf));
+
+	exec[0].handle = batch_create_size(fd, size);
+	exec[1].handle = batch_create_size(fd, size);
+
+	/*
+	 * To test 4fe2bd195435, we need multiple buffers submitted and
+	 * eb_add_vma() to fail. eb_add_vma() checks whether
+	 * batch_start_offset + batch_len is smaller than the vma size, and
+	 * fails with -EINVAL if it isn't. Submitting two buffers and setting
+	 * the offset to the size of the first batch will trigger this
+	 * error path.
+	 */
+
+	execbuf.buffers_ptr = to_user_pointer(exec);
+	execbuf.buffer_count = 2;
+	execbuf.batch_start_offset = size;
+
+	igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
+
+	gem_sync(fd, exec[0].handle);
+	gem_sync(fd, exec[1].handle);
+
+	gem_close(fd, exec[0].handle);
+	gem_close(fd, exec[1].handle);
+}
+
 static void test_larger_than_life_batch(int fd)
 {
 	const struct intel_execution_engine2 *e;
@@ -705,6 +752,9 @@ int igt_main()
 	igt_subtest("larger-than-life-batch")
 		test_larger_than_life_batch(fd);
 
+	igt_subtest("invalid-offset-multiple-buffers")
+		test_invalid_offset_multiple_buffers(fd);
+
 #define DIRT(name) \
 	igt_subtest(#name "-dirt") { \
 		execbuf.flags = 0; \
-- 
2.55.0


^ permalink raw reply related	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2026-08-20 13:18 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-08-19 15:21 [PATCH i-g-t v2] tests/intel/gem_exec_params: add invalid-offset-multiple-buffers test Krzysztof Niemiec
2026-08-19 20:04 ` ✓ Xe.CI.BAT: success for tests/intel/gem_exec_params: add invalid-offset-multiple-buffers test (rev2) Patchwork
2026-08-19 20:45 ` ✓ i915.CI.BAT: " Patchwork
2026-08-20  0:14 ` ✗ Xe.CI.FULL: failure " Patchwork
2026-08-20  2:36 ` ✗ i915.CI.Full: " Patchwork
2026-08-20  7:15 ` [PATCH i-g-t v2] tests/intel/gem_exec_params: add invalid-offset-multiple-buffers test Krzysztof Karas
2026-08-20 13:17   ` Krzysztof Niemiec
2026-08-20  8:26 ` Sebastian Brzezinka

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