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util/shm: clear mode permission bits in allocate_shm_file_pair
This ensures the file cannot be re-opened with write permissions. Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3429
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@ -3,6 +3,7 @@
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#include <fcntl.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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#include <wlr/config.h>
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@ -73,6 +74,14 @@ bool allocate_shm_file_pair(size_t size, int *rw_fd_ptr, int *ro_fd_ptr) {
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shm_unlink(name);
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// Make sure the file cannot be re-opened in read-write mode (e.g. via
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// "/proc/self/fd/" on Linux)
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if (fchmod(rw_fd, 0) != 0) {
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close(rw_fd);
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close(ro_fd);
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return false;
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}
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int ret;
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do {
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ret = ftruncate(rw_fd, size);
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