egl+libsync: Add check for valid fence-fd
Debugging fd mix-ups (ie. where, possibly via close()ing the original fd, etc, you end up with something that is a valid fd but not a valid *fence* fd) can be difficult. Fortunately we can use the FILE_INFO ioctl, which will return an error if the fd is not a fence fd. For android, we instead use the libsync API, which does a similar thing on modern kernels, but has a fallback path for older android kernels. Note that the FILE_INFO ioctl has existed upstream since at least prior to destaging of sync_file. Signed-off-by: Rob Clark <robdclark@chromium.org> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11202>
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@ -17,4 +17,13 @@ int sync_merge(const char *name, int fd, int fd2)
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return 0;
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}
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struct sync_file_info* sync_file_info(int32_t fd)
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{
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return NULL;
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}
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void sync_file_info_free(struct sync_file_info* info)
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{
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}
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}
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@ -62,6 +62,7 @@
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#include "egl_dri2.h"
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#include "GL/mesa_glinterop.h"
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#include "loader/loader.h"
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#include "util/libsync.h"
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#include "util/os_file.h"
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#include "util/u_atomic.h"
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#include "util/u_vector.h"
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@ -3495,6 +3496,8 @@ dri2_dup_native_fence_fd(_EGLDisplay *disp, _EGLSync *sync)
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return EGL_NO_NATIVE_FENCE_FD_ANDROID;
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}
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assert(sync_valid_fd(sync->SyncFd));
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return os_dupfd_cloexec(sync->SyncFd);
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}
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@ -30,6 +30,7 @@
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/ioctl.h>
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@ -46,6 +47,25 @@ extern "C" {
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* Android kernels.
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*/
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#include <android/sync.h>
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/**
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* Check if the fd represents a valid fence-fd.
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*
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* The android variant of this debug helper is implemented on top of the
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* system's libsync for compatibility with pre-4.7 android kernels.
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*/
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static inline bool
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sync_valid_fd(int fd)
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{
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/* sync_file_info() only available in SDK 26. */
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#if ANDROID_API_LEVEL >= 26
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struct sync_file_info *info = sync_file_info(fd);
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if (!info)
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return false;
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sync_file_info_free(info);
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#endif
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return true;
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}
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#else
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#ifndef SYNC_IOC_MERGE
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@ -61,8 +81,20 @@ struct sync_merge_data {
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uint32_t flags;
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uint32_t pad;
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};
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struct sync_file_info {
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char name[32];
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int32_t status;
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uint32_t flags;
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uint32_t num_fences;
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uint32_t pad;
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uint64_t sync_fence_info;
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};
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#define SYNC_IOC_MAGIC '>'
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#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
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#define SYNC_IOC_FILE_INFO _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)
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#endif
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@ -109,6 +141,16 @@ static inline int sync_merge(const char *name, int fd1, int fd2)
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return data.fence;
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}
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/**
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* Check if the fd represents a valid fence-fd.
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*/
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static inline bool
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sync_valid_fd(int fd)
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{
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struct sync_file_info info = {{0}};
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return ioctl(fd, SYNC_IOC_FILE_INFO, &info) >= 0;
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}
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#endif /* !ANDROID */
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/* accumulate fd2 into fd1. If *fd1 is not a valid fd then dup fd2,
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