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/*
* Copyright © 2013 Google
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Kees Cook <keescook@chromium.org>
* Daniel Vetter <daniel.vetter@ffwll.ch>
* Rafael Barbalho <rafael.barbalho@intel.com>
*
*/
#include "igt.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <unistd.h>
#include <malloc.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include "drm.h"
IGT_TEST_DESCRIPTION("Check that kernel relocation overflows are caught.");
/*
* Testcase: Kernel relocation overflows are caught.
*/
int fd, entries, num;
struct drm_i915_gem_exec_object2 *obj;
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_relocation_entry *reloc;
static uint32_t target_handle(void)
{
return execbuf.flags & I915_EXEC_HANDLE_LUT ? 0 : obj[0].handle;
}
static void source_offset_tests(int devid, bool reloc_gtt)
{
struct drm_i915_gem_relocation_entry single_reloc;
const char *relocation_type;
if (reloc_gtt)
relocation_type = "reloc-gtt";
else
relocation_type = "reloc-cpu";
igt_fixture {
obj[1].relocation_count = 0;
obj[1].relocs_ptr = 0;
obj[0].relocation_count = 1;
obj[0].relocs_ptr = to_user_pointer(&single_reloc);
execbuf.buffer_count = 2;
if (reloc_gtt) {
gem_set_domain(fd, obj[0].handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
relocation_type = "reloc-gtt";
} else {
gem_set_domain(fd, obj[0].handle, I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
relocation_type = "reloc-cpu";
}
}
/* Special tests for 64b relocs. */
igt_subtest_f("source-offset-page-stradle-gen8-%s", relocation_type) {
igt_require(intel_gen(devid) >= 8);
single_reloc.offset = 4096 - 4;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
gem_execbuf(fd, &execbuf);
single_reloc.delta = 1024;
gem_execbuf(fd, &execbuf);
}
igt_subtest_f("source-offset-end-gen8-%s", relocation_type) {
igt_require(intel_gen(devid) >= 8);
single_reloc.offset = 8192 - 8;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
gem_execbuf(fd, &execbuf);
}
igt_subtest_f("source-offset-overflow-gen8-%s", relocation_type) {
igt_require(intel_gen(devid) >= 8);
single_reloc.offset = 8192 - 4;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
/* Tests for old 4byte relocs on pre-gen8. */
igt_subtest_f("source-offset-end-%s", relocation_type) {
igt_require(intel_gen(devid) < 8);
single_reloc.offset = 8192 - 4;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
gem_execbuf(fd, &execbuf);
}
igt_subtest_f("source-offset-big-%s", relocation_type) {
single_reloc.offset = 8192;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
igt_subtest_f("source-offset-negative-%s", relocation_type) {
single_reloc.offset = (int64_t) -4;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
igt_subtest_f("source-offset-unaligned-%s", relocation_type) {
single_reloc.offset = 1;
single_reloc.delta = 0;
single_reloc.target_handle = target_handle();
single_reloc.read_domains = I915_GEM_DOMAIN_RENDER;
single_reloc.write_domain = I915_GEM_DOMAIN_RENDER;
single_reloc.presumed_offset = -1;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
}
static void reloc_tests(const char *suffix)
{
uint64_t max_relocations;
int i;
max_relocations = min(ULONG_MAX, SIZE_MAX);
max_relocations /= sizeof(struct drm_i915_gem_relocation_entry);
igt_debug("Maximum allocable relocations: %'llu\n",
(long long)max_relocations);
igt_subtest_f("invalid-address%s", suffix) {
/* Attempt unmapped single entry. */
obj[0].relocation_count = 1;
obj[0].relocs_ptr = 0;
execbuf.buffer_count = 1;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
}
igt_subtest_f("single-fault%s", suffix) {
obj[0].relocation_count = entries + 1;
execbuf.buffer_count = 1;
/* out-of-bounds after */
obj[0].relocs_ptr = to_user_pointer(reloc);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
/* out-of-bounds before */
obj[0].relocs_ptr = to_user_pointer((reloc - 1));
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
}
igt_fixture {
obj[0].relocation_count = 0;
obj[0].relocs_ptr = 0;
execbuf.buffer_count = 1;
/* Make sure the batch would succeed except for the thing we're
* testing. */
igt_require(__gem_execbuf(fd, &execbuf) == 0);
}
igt_subtest_f("batch-start-unaligned%s", suffix) {
execbuf.batch_start_offset = 1;
execbuf.batch_len = 8;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
igt_subtest_f("batch-end-unaligned%s", suffix) {
execbuf.batch_start_offset = 0;
execbuf.batch_len = 7;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
igt_subtest_f("batch-both-unaligned%s", suffix) {
execbuf.batch_start_offset = 1;
execbuf.batch_len = 7;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
igt_fixture {
/* Undo damage for next tests. */
execbuf.batch_start_offset = 0;
execbuf.batch_len = 0;
igt_require(__gem_execbuf(fd, &execbuf) == 0);
}
igt_subtest_f("single-overflow%s", suffix) {
if (*suffix) {
igt_require_f(intel_get_avail_ram_mb() >
sizeof(struct drm_i915_gem_relocation_entry) * entries / (1024*1024),
"Test requires at least %'llu MiB, but only %'llu MiB of RAM available\n",
(long long)sizeof(struct drm_i915_gem_relocation_entry) * entries / (1024*1024),
(long long)intel_get_avail_ram_mb());
}
obj[0].relocs_ptr = to_user_pointer(reloc);
obj[0].relocation_count = entries;
execbuf.buffer_count = 1;
gem_execbuf(fd, &execbuf);
/* Attempt single overflowed entry. */
obj[0].relocation_count = -1;
igt_debug("relocation_count=%u\n",
obj[0].relocation_count);
if (max_relocations <= obj[0].relocation_count)
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
else
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
if (max_relocations + 1 < obj[0].relocation_count) {
obj[0].relocation_count = max_relocations + 1;
igt_debug("relocation_count=%u\n",
obj[0].relocation_count);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
obj[0].relocation_count = max_relocations - 1;
igt_debug("relocation_count=%u\n",
obj[0].relocation_count);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
}
}
igt_subtest_f("wrapped-overflow%s", suffix) {
if (*suffix) {
igt_require_f(intel_get_avail_ram_mb() >
sizeof(struct drm_i915_gem_relocation_entry) * entries * num / (1024*1024),
"Test requires at least %'llu MiB, but only %'llu MiB of RAM available\n",
(long long)sizeof(struct drm_i915_gem_relocation_entry) * entries * num / (1024*1024),
(long long)intel_get_avail_ram_mb());
}
for (i = 0; i < num; i++) {
struct drm_i915_gem_exec_object2 *o = &obj[i];
o->relocs_ptr = to_user_pointer(reloc);
o->relocation_count = entries;
}
execbuf.buffer_count = i;
gem_execbuf(fd, &execbuf);
obj[i-1].relocation_count = -1;
igt_debug("relocation_count[%d]=%u\n",
i-1, obj[i-1].relocation_count);
if (max_relocations <= obj[i-1].relocation_count)
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
else
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
if (max_relocations < obj[i-1].relocation_count) {
obj[i-1].relocation_count = max_relocations;
igt_debug("relocation_count[%d]=%u\n",
i-1, obj[i-1].relocation_count);
/* Whether the kernel reports the EFAULT for the
* invalid relocation array or EINVAL for the overflow
* in array size depends upon the order of the
* individual tests. From a consistency perspective
* EFAULT is preferred (i.e. using that relocation
* array by itself would cause EFAULT not EINVAL).
*/
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
obj[i-1].relocation_count = max_relocations - 1;
igt_debug("relocation_count[%d]=%u\n",
i-1, obj[i-1].relocation_count);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
}
obj[i-1].relocation_count = entries + 1;
igt_debug("relocation_count[%d]=%u\n",
i-1, obj[i-1].relocation_count);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
obj[0].relocation_count = -1;
if (max_relocations < obj[0].relocation_count) {
execbuf.buffer_count = 1;
gem_execbuf(fd, &execbuf);
/* As outlined above, this is why EFAULT is preferred */
obj[0].relocation_count = max_relocations;
igt_debug("relocation_count[0]=%u\n",
obj[0].relocation_count);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EFAULT);
}
}
}
static void buffer_count_tests(void)
{
igt_subtest("buffercount-overflow") {
igt_skip_on(SIZE_MAX / sizeof(*obj) >= UINT_MAX);
for (int i = 0; i < num; i++) {
obj[i].relocation_count = 0;
obj[i].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;
/* Make sure the basic thing would work first ... */
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 *);
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
/* ... then be evil: Copying/allocating the array. */
execbuf.buffer_count = UINT_MAX / sizeof(obj[0]) + 1;
igt_assert_eq(__gem_execbuf(fd, &execbuf), -EINVAL);
}
}
igt_main
{
int devid = 0;
igt_fixture {
uint32_t bbe = MI_BATCH_BUFFER_END;
size_t reloc_size;
fd = drm_open_driver(DRIVER_INTEL);
igt_require_gem(fd);
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);
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 %'llu MiB of available memory\n",
(long long unsigned)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. */
intel_require_memory(num+1, 4096, CHECK_RAM);
obj = calloc(num, sizeof(*obj));
igt_assert(obj);
/* 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. */
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = to_user_pointer(obj);
execbuf.buffer_count = 1;
execbuf.flags = I915_EXEC_HANDLE_LUT;
if (__gem_execbuf(fd, &execbuf))
execbuf.flags = 0;
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("");
igt_fixture
igt_disable_prefault();
reloc_tests("-noprefault");
igt_fixture
igt_enable_prefault();
source_offset_tests(devid, false);
source_offset_tests(devid, true);
buffer_count_tests();
}