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igt/gem_reloc_overflow: Fix errno tests for "overflow"
The execbuffer2 ABI is not strictly limited to a total of UINT32_MAX entries, rather each object can have a maximum of UINT32_MAX relocation entries and the current implementation imposes that the total must be allocable in a contiguous buffer when necessary (i.e as large as the kernel can conceivably allocate). This is not an ABI constraint per-se, just an implementation issue. Whilst updating the limits for 64bit kernels, review usable of ioctl-wrappers (i.e. use __gem_execbuf now available) and include a batch of more tests to explore the boundary conditions of the maximum relocation size. Note that rather than guess the reloc-max, it would be better if we queried it. Also it is of vital importance that when constructing a test to fail in a particular fashion, it must not include any other error (e.g. we were passing in relocation arrays with invalid target handle and domains when looking for a potential overflow across multiple objects). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
parent
ec1ac2e2e9
commit
2d2b61e160
@ -52,19 +52,18 @@ IGT_TEST_DESCRIPTION("Check that kernel relocation overflows are caught.");
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*/
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int fd, entries, num;
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size_t reloc_size;
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uint32_t *handles;
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struct drm_i915_gem_exec_object2 *execobjs;
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struct drm_i915_gem_execbuffer2 execbuf = { 0 };
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struct drm_i915_gem_exec_object2 *obj;
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struct drm_i915_gem_execbuffer2 execbuf;
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struct drm_i915_gem_relocation_entry *reloc;
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uint32_t handle;
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uint32_t batch_handle;
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static uint32_t target_handle(void)
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{
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return execbuf.flags & I915_EXEC_HANDLE_LUT ? 0 : obj[0].handle;
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}
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static void source_offset_tests(int devid, bool reloc_gtt)
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{
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struct drm_i915_gem_relocation_entry single_reloc;
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void *dst_gtt;
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const char *relocation_type;
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if (reloc_gtt)
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@ -73,25 +72,18 @@ static void source_offset_tests(int devid, bool reloc_gtt)
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relocation_type = "reloc-cpu";
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igt_fixture {
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handle = gem_create(fd, 8192);
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obj[1].relocation_count = 0;
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obj[1].relocs_ptr = 0;
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execobjs[1].handle = batch_handle;
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execobjs[1].relocation_count = 0;
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execobjs[1].relocs_ptr = 0;
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execobjs[0].handle = handle;
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execobjs[0].relocation_count = 1;
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execobjs[0].relocs_ptr = (uintptr_t) &single_reloc;
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obj[0].relocation_count = 1;
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obj[0].relocs_ptr = (uintptr_t) &single_reloc;
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execbuf.buffer_count = 2;
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if (reloc_gtt) {
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dst_gtt = __gem_mmap__gtt(fd, handle, 8192, PROT_READ | PROT_WRITE);
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igt_assert(dst_gtt != MAP_FAILED);
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gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
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memset(dst_gtt, 0, 8192);
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munmap(dst_gtt, 8192);
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gem_set_domain(fd, obj[0].handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
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relocation_type = "reloc-gtt";
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} else {
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gem_set_domain(fd, obj[0].handle, I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
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relocation_type = "reloc-cpu";
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}
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}
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@ -101,39 +93,36 @@ static void source_offset_tests(int devid, bool reloc_gtt)
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igt_require(intel_gen(devid) >= 8);
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single_reloc.offset = 4096 - 4;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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gem_execbuf(fd, &execbuf);
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) == 0);
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single_reloc.delta = 1024;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) == 0);
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gem_execbuf(fd, &execbuf);
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}
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igt_subtest_f("source-offset-end-gen8-%s", relocation_type) {
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igt_require(intel_gen(devid) >= 8);
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single_reloc.offset = 8192 - 8;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) == 0);
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gem_execbuf(fd, &execbuf);
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}
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igt_subtest_f("source-offset-overflow-gen8-%s", relocation_type) {
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igt_require(intel_gen(devid) >= 8);
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single_reloc.offset = 8192 - 4;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) != 0);
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igt_assert(errno == EINVAL);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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/* Tests for old 4byte relocs on pre-gen8. */
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@ -141,140 +130,209 @@ static void source_offset_tests(int devid, bool reloc_gtt)
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igt_require(intel_gen(devid) < 8);
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single_reloc.offset = 8192 - 4;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) == 0);
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gem_execbuf(fd, &execbuf);
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}
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igt_subtest_f("source-offset-big-%s", relocation_type) {
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single_reloc.offset = 8192;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) != 0);
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igt_assert(errno == EINVAL);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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igt_subtest_f("source-offset-negative-%s", relocation_type) {
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single_reloc.offset = (int64_t) -4;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) != 0);
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igt_assert(errno == EINVAL);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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igt_subtest_f("source-offset-unaligned-%s", relocation_type) {
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single_reloc.offset = 1;
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single_reloc.delta = 0;
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single_reloc.target_handle = handle;
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single_reloc.target_handle = target_handle();
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single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
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single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
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single_reloc.presumed_offset = 0;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) != 0);
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igt_assert(errno == EINVAL);
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}
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igt_fixture {
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gem_close(fd, handle);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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}
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static void reloc_tests(void)
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static void reloc_tests(const char *suffix)
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{
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uint64_t max_relocations;
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int i;
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unsigned int total_unsigned = 0;
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igt_subtest("invalid-address") {
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max_relocations = min(ULONG_MAX, SIZE_MAX);
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max_relocations /= sizeof(struct drm_i915_gem_relocation_entry);
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igt_debug("Maximum allocable relocations: %'llu\n",
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(long long)max_relocations);
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igt_subtest_f("invalid-address%s", suffix) {
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/* Attempt unmapped single entry. */
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execobjs[0].relocation_count = 1;
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execobjs[0].relocs_ptr = 0;
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obj[0].relocation_count = 1;
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obj[0].relocs_ptr = 0;
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execbuf.buffer_count = 1;
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errno = 0;
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ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
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igt_assert(errno == EFAULT);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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}
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igt_subtest("single-overflow") {
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/* Attempt single overflowed entry. */
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execobjs[0].relocation_count = (1 << 31);
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execobjs[0].relocs_ptr = (uintptr_t)reloc;
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igt_subtest_f("single-fault%s", suffix) {
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obj[0].relocation_count = entries + 1;
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execbuf.buffer_count = 1;
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errno = 0;
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ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
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igt_assert(errno == EINVAL);
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/* out-of-bounds after */
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obj[0].relocs_ptr = (uintptr_t)reloc;
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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/* out-of-bounds before */
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obj[0].relocs_ptr = (uintptr_t)(reloc - 1);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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}
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igt_fixture {
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execobjs[0].handle = batch_handle;
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execobjs[0].relocation_count = 0;
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execobjs[0].relocs_ptr = 0;
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obj[0].relocation_count = 0;
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obj[0].relocs_ptr = 0;
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execbuf.buffer_count = 1;
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/* Make sure the batch would succeed except for the thing we're
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* testing. */
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execbuf.batch_start_offset = 0;
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execbuf.batch_len = 8;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) == 0);
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igt_require(__gem_execbuf(fd, &execbuf) == 0);
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}
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igt_subtest("batch-start-unaligned") {
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igt_subtest_f("batch-start-unaligned%s", suffix) {
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execbuf.batch_start_offset = 1;
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execbuf.batch_len = 8;
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) != 0);
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igt_assert(errno == EINVAL);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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igt_subtest("batch-end-unaligned") {
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igt_subtest_f("batch-end-unaligned%s", suffix) {
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execbuf.batch_start_offset = 0;
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execbuf.batch_len = 7;
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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igt_assert(ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) != 0);
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igt_assert(errno == EINVAL);
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igt_subtest_f("batch-both-unaligned%s", suffix) {
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execbuf.batch_start_offset = 1;
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execbuf.batch_len = 7;
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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}
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igt_fixture {
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/* Undo damage for next tests. */
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execbuf.batch_start_offset = 0;
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execbuf.batch_len = 8;
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execbuf.batch_len = 0;
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igt_require(__gem_execbuf(fd, &execbuf) == 0);
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}
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igt_subtest("wrapped-overflow") {
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/* Attempt wrapped overflow entries. */
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for (i = 0; i < num; i++) {
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struct drm_i915_gem_exec_object2 *obj = &execobjs[i];
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obj->handle = handles[i];
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if (i == num - 1) {
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/* Wraps to 1 on last count. */
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obj->relocation_count = 1 - total_unsigned;
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obj->relocs_ptr = (uintptr_t)reloc;
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} else {
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obj->relocation_count = entries;
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obj->relocs_ptr = (uintptr_t)reloc;
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}
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total_unsigned += obj->relocation_count;
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igt_subtest_f("single-overflow%s", suffix) {
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if (*suffix) {
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igt_require_f(intel_get_avail_ram_mb() >
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sizeof(struct drm_i915_gem_relocation_entry) * entries / (1024*1024),
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"Test requires at least %'llu MiB, but only %'llu MiB of RAM available\n",
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(long long)sizeof(struct drm_i915_gem_relocation_entry) * entries / (1024*1024),
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(long long)intel_get_avail_ram_mb());
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}
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execbuf.buffer_count = num;
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errno = 0;
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ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
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igt_assert(errno == EINVAL);
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obj[0].relocs_ptr = (uintptr_t)reloc;
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obj[0].relocation_count = entries;
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execbuf.buffer_count = 1;
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gem_execbuf(fd, &execbuf);
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/* Attempt single overflowed entry. */
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obj[0].relocation_count = -1;
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igt_debug("relocation_count=%u\n",
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obj[0].relocation_count);
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if (max_relocations <= obj[0].relocation_count)
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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else
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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if (max_relocations + 1 < obj[0].relocation_count) {
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obj[0].relocation_count = max_relocations + 1;
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igt_debug("relocation_count=%u\n",
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obj[0].relocation_count);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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obj[0].relocation_count = max_relocations - 1;
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igt_debug("relocation_count=%u\n",
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obj[0].relocation_count);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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}
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}
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igt_subtest_f("wrapped-overflow%s", suffix) {
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if (*suffix) {
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igt_require_f(intel_get_avail_ram_mb() >
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sizeof(struct drm_i915_gem_relocation_entry) * entries * num / (1024*1024),
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"Test requires at least %'llu MiB, but only %'llu MiB of RAM available\n",
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(long long)sizeof(struct drm_i915_gem_relocation_entry) * entries * num / (1024*1024),
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(long long)intel_get_avail_ram_mb());
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}
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for (i = 0; i < num; i++) {
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struct drm_i915_gem_exec_object2 *o = &obj[i];
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o->relocs_ptr = (uintptr_t)reloc;
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o->relocation_count = entries;
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}
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execbuf.buffer_count = i;
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gem_execbuf(fd, &execbuf);
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obj[i-1].relocation_count = -1;
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igt_debug("relocation_count[%d]=%u\n",
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i-1, obj[i-1].relocation_count);
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if (max_relocations <= obj[i-1].relocation_count)
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
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else
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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if (max_relocations < obj[i-1].relocation_count) {
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obj[i-1].relocation_count = max_relocations;
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igt_debug("relocation_count[%d]=%u\n",
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i-1, obj[i-1].relocation_count);
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/* Whether the kernel reports the EFAULT for the
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* invalid relocation array or EINVAL for the overflow
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* in array size depends upon the order of the
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* individual tests. From a consistency perspective
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* EFAULT is preferred (i.e. using that relocation
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* array by itself would cause EFAULT not EINVAL).
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*/
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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obj[i-1].relocation_count = max_relocations - 1;
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igt_debug("relocation_count[%d]=%u\n",
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i-1, obj[i-1].relocation_count);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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}
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obj[i-1].relocation_count = entries + 1;
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igt_debug("relocation_count[%d]=%u\n",
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i-1, obj[i-1].relocation_count);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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obj[0].relocation_count = -1;
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if (max_relocations < obj[0].relocation_count) {
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execbuf.buffer_count = 1;
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gem_execbuf(fd, &execbuf);
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/* As outlined above, this is why EFAULT is preferred */
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obj[0].relocation_count = max_relocations;
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igt_debug("relocation_count[0]=%u\n",
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obj[0].relocation_count);
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igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
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}
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}
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}
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@ -282,39 +340,25 @@ static void buffer_count_tests(void)
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{
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igt_subtest("buffercount-overflow") {
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for (int i = 0; i < num; i++) {
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execobjs[i].relocation_count = 0;
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execobjs[i].relocs_ptr = 0;
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execobjs[i].handle = handles[i];
|
||||
obj[i].relocation_count = 0;
|
||||
obj[i].relocs_ptr = 0;
|
||||
}
|
||||
|
||||
execobjs[0].relocation_count = 0;
|
||||
execobjs[0].relocs_ptr = 0;
|
||||
/* We only have num buffers actually, but the overflow will make
|
||||
* sure we blow up the kernel before we blow up userspace. */
|
||||
execbuf.buffer_count = num;
|
||||
|
||||
/* Put a real batch at the end. */
|
||||
execobjs[num - 1].handle = batch_handle;
|
||||
|
||||
/* Make sure the basic thing would work first ... */
|
||||
errno = 0;
|
||||
ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
|
||||
igt_assert(errno == 0);
|
||||
gem_execbuf(fd, &execbuf);
|
||||
|
||||
/* ... then be evil: Overflow of the pointer table (which has a
|
||||
* bit of lead datastructures, so no + 1 needed to overflow). */
|
||||
execbuf.buffer_count = INT_MAX / sizeof(void *);
|
||||
|
||||
errno = 0;
|
||||
ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
|
||||
igt_assert(errno == EINVAL);
|
||||
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
|
||||
|
||||
/* ... then be evil: Copying/allocating the array. */
|
||||
execbuf.buffer_count = UINT_MAX / sizeof(execobjs[0]) + 1;
|
||||
|
||||
errno = 0;
|
||||
ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
|
||||
igt_assert(errno == EINVAL);
|
||||
execbuf.buffer_count = UINT_MAX / sizeof(obj[0]) + 1;
|
||||
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
|
||||
}
|
||||
}
|
||||
|
||||
@ -323,58 +367,65 @@ igt_main
|
||||
int devid = 0;
|
||||
|
||||
igt_fixture {
|
||||
int ring;
|
||||
uint32_t batch_data [2] = { MI_NOOP, MI_BATCH_BUFFER_END };
|
||||
uint32_t bbe = MI_BATCH_BUFFER_END;
|
||||
size_t reloc_size;
|
||||
|
||||
fd = drm_open_driver(DRIVER_INTEL);
|
||||
|
||||
devid = intel_get_drm_devid(fd);
|
||||
|
||||
/* Create giant reloc buffer area. */
|
||||
num = 257;
|
||||
entries = ((1ULL << 32) / (num - 1));
|
||||
reloc_size = entries * sizeof(struct drm_i915_gem_relocation_entry);
|
||||
reloc = mmap(NULL, reloc_size, PROT_READ | PROT_WRITE,
|
||||
igt_assert((reloc_size & 4095) == 0);
|
||||
reloc = mmap(NULL, reloc_size + 2*4096, PROT_READ | PROT_WRITE,
|
||||
MAP_PRIVATE | MAP_ANON, -1, 0);
|
||||
igt_assert(reloc != MAP_FAILED);
|
||||
igt_require_f(mlock(reloc, reloc_size) == 0,
|
||||
"Tests require at least %'lu MiB of available memory\n",
|
||||
reloc_size / (1024*1024));
|
||||
|
||||
/* disable access before + after */
|
||||
mprotect(reloc, 4096, 0);
|
||||
reloc = (struct drm_i915_gem_relocation_entry *)((char *)reloc + 4096);
|
||||
mprotect(reloc + entries, 4096, 0);
|
||||
|
||||
/* Allocate the handles we'll need to wrap. */
|
||||
handles = calloc(num, sizeof(*handles));
|
||||
for (int i = 0; i < num; i++)
|
||||
handles[i] = gem_create(fd, 4096);
|
||||
intel_require_memory(num+1, 4096, CHECK_RAM);
|
||||
obj = calloc(num, sizeof(*obj));
|
||||
igt_assert(obj);
|
||||
|
||||
if (intel_gen(devid) >= 6)
|
||||
ring = I915_EXEC_BLT;
|
||||
else
|
||||
ring = 0;
|
||||
/* First object is used for page crossing tests */
|
||||
obj[0].handle = gem_create(fd, 8192);
|
||||
gem_write(fd, obj[0].handle, 0, &bbe, sizeof(bbe));
|
||||
for (int i = 1; i < num; i++) {
|
||||
obj[i].handle = gem_create(fd, 4096);
|
||||
gem_write(fd, obj[i].handle, 0, &bbe, sizeof(bbe));
|
||||
}
|
||||
|
||||
/* Create relocation objects. */
|
||||
execobjs = calloc(num, sizeof(*execobjs));
|
||||
execbuf.buffers_ptr = (uintptr_t)execobjs;
|
||||
execbuf.batch_start_offset = 0;
|
||||
execbuf.batch_len = 8;
|
||||
execbuf.cliprects_ptr = 0;
|
||||
execbuf.num_cliprects = 0;
|
||||
execbuf.DR1 = 0;
|
||||
execbuf.DR4 = 0;
|
||||
execbuf.flags = ring;
|
||||
i915_execbuffer2_set_context_id(execbuf, 0);
|
||||
execbuf.rsvd2 = 0;
|
||||
memset(&execbuf, 0, sizeof(execbuf));
|
||||
execbuf.buffers_ptr = (uintptr_t)obj;
|
||||
execbuf.buffer_count = 1;
|
||||
execbuf.flags = I915_EXEC_HANDLE_LUT;
|
||||
if (__gem_execbuf(fd, &execbuf))
|
||||
execbuf.flags = 0;
|
||||
|
||||
batch_handle = gem_create(fd, 4096);
|
||||
|
||||
gem_write(fd, batch_handle, 0, batch_data, sizeof(batch_data));
|
||||
for (int i = 0; i < entries; i++) {
|
||||
reloc[i].target_handle = target_handle();
|
||||
reloc[i].offset = 1024;
|
||||
reloc[i].read_domains = I915_GEM_DOMAIN_INSTRUCTION;
|
||||
reloc[i].write_domain = 0;
|
||||
}
|
||||
}
|
||||
|
||||
reloc_tests();
|
||||
reloc_tests("");
|
||||
igt_disable_prefault();
|
||||
reloc_tests("-noprefault");
|
||||
igt_enable_prefault();
|
||||
|
||||
source_offset_tests(devid, false);
|
||||
source_offset_tests(devid, true);
|
||||
|
||||
buffer_count_tests();
|
||||
|
||||
igt_fixture {
|
||||
gem_close(fd, batch_handle);
|
||||
close(fd);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user