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bar/wayland: seal memfd

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Daniel Eklöf 2023-10-08 11:12:08 +02:00
parent 9a111a52f5
commit 7fbc1f2c44
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1 changed files with 11 additions and 0 deletions
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bar/wayland.c
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@ -937,6 +937,17 @@ get_buffer(struct wayland_backend *backend)
goto err; goto err;
} }
#if defined(MEMFD_CREATE)
/* Seal file - we no longer allow any kind of resizing */
/* TODO: wayland mmaps(PROT_WRITE), for some unknown reason, hence we cannot use F_SEAL_FUTURE_WRITE */
if (fcntl(pool_fd, F_ADD_SEALS,
F_SEAL_GROW | F_SEAL_SHRINK | /*F_SEAL_FUTURE_WRITE |*/ F_SEAL_SEAL) < 0)
{
LOG_ERRNO("failed to seal SHM backing memory file");
/* This is not a fatal error */
}
#endif
pool = wl_shm_create_pool(backend->shm, pool_fd, size); pool = wl_shm_create_pool(backend->shm, pool_fd, size);
if (pool == NULL) { if (pool == NULL) {
LOG_ERR("failed to create SHM pool"); LOG_ERR("failed to create SHM pool");