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- // Copyright 2019 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "media/gpu/buffer_validation.h"
- #include <algorithm>
- #include <cstdint>
- #include "base/logging.h"
- #include "base/numerics/checked_math.h"
- #include "base/numerics/safe_conversions.h"
- #include "build/build_config.h"
- #include "media/base/video_frame.h"
- #include "ui/gfx/geometry/size.h"
- #include "ui/gfx/gpu_memory_buffer.h"
- #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- #include <sys/types.h>
- #include <unistd.h>
- #endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- namespace media {
- bool GetFileSize(const int fd, size_t* size) {
- #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- if (fd < 0) {
- VLOG(1) << "Invalid file descriptor";
- return false;
- }
- off_t fd_size = lseek(fd, 0, SEEK_END);
- lseek(fd, 0, SEEK_SET);
- if (fd_size < 0u) {
- VPLOG(1) << "Fail to find the size of fd";
- return false;
- }
- if (!base::IsValueInRangeForNumericType<size_t>(fd_size)) {
- VLOG(1) << "fd_size is out of range of size_t"
- << ", size=" << size
- << ", size_t max=" << std::numeric_limits<size_t>::max()
- << ", size_t min=" << std::numeric_limits<size_t>::min();
- return false;
- }
- *size = static_cast<size_t>(fd_size);
- return true;
- #else
- NOTIMPLEMENTED();
- return false;
- #endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- }
- bool VerifyGpuMemoryBufferHandle(
- media::VideoPixelFormat pixel_format,
- const gfx::Size& coded_size,
- const gfx::GpuMemoryBufferHandle& gmb_handle,
- GetFileSizeCBForTesting file_size_cb_for_testing) {
- if (gmb_handle.type != gfx::NATIVE_PIXMAP) {
- VLOG(1) << "Unexpected GpuMemoryBufferType: " << gmb_handle.type;
- return false;
- }
- if (!media::VideoFrame::IsValidCodedSize(coded_size)) {
- VLOG(1) << "Coded size is beyond allowed dimensions: "
- << coded_size.ToString();
- return false;
- }
- // YV12 is used by ARC++ on MTK8173. Consider removing it.
- if (pixel_format != PIXEL_FORMAT_I420 && pixel_format != PIXEL_FORMAT_YV12 &&
- pixel_format != PIXEL_FORMAT_NV12 &&
- pixel_format != PIXEL_FORMAT_P016LE) {
- VLOG(1) << "Unsupported: " << pixel_format;
- return false;
- }
- #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- const size_t num_planes = media::VideoFrame::NumPlanes(pixel_format);
- if (num_planes != gmb_handle.native_pixmap_handle.planes.size() ||
- num_planes == 0) {
- VLOG(1) << "Invalid number of dmabuf planes passed: "
- << gmb_handle.native_pixmap_handle.planes.size()
- << ", expected: " << num_planes;
- return false;
- }
- // Strides monotonically decrease.
- for (size_t i = 1; i < num_planes; i++) {
- if (gmb_handle.native_pixmap_handle.planes[i - 1].stride <
- gmb_handle.native_pixmap_handle.planes[i].stride) {
- return false;
- }
- }
- for (size_t i = 0; i < num_planes; i++) {
- const auto& plane = gmb_handle.native_pixmap_handle.planes[i];
- DVLOG(4) << "Plane " << i << ", offset: " << plane.offset
- << ", stride: " << plane.stride;
- size_t file_size_in_bytes;
- if (file_size_cb_for_testing) {
- file_size_in_bytes = file_size_cb_for_testing.Run();
- } else if (!plane.fd.is_valid() ||
- !GetFileSize(plane.fd.get(), &file_size_in_bytes)) {
- return false;
- }
- size_t plane_height =
- media::VideoFrame::Rows(i, pixel_format, coded_size.height());
- base::CheckedNumeric<size_t> min_plane_size =
- base::CheckMul(base::strict_cast<size_t>(plane.stride), plane_height);
- size_t plane_pixel_width =
- media::VideoFrame::RowBytes(i, pixel_format, coded_size.width());
- if (!min_plane_size.IsValid<uint64_t>() ||
- min_plane_size.ValueOrDie<uint64_t>() > plane.size ||
- base::strict_cast<size_t>(plane.stride) < plane_pixel_width) {
- VLOG(1) << "Invalid strides/sizes";
- return false;
- }
- // Check |offset| + (the size of a plane) on each plane is not larger than
- // |file_size_in_bytes|. This ensures we don't access out of a buffer
- // referred by |fd|.
- base::CheckedNumeric<uint64_t> min_buffer_size =
- base::CheckAdd(plane.offset, plane.size);
- if (!min_buffer_size.IsValid() ||
- min_buffer_size.ValueOrDie() >
- base::strict_cast<uint64_t>(file_size_in_bytes)) {
- VLOG(1) << "Invalid strides/offsets";
- return false;
- }
- }
- return true;
- #else
- NOTIMPLEMENTED();
- return false;
- #endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- }
- } // namespace media
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