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shm: Always try to set F_SEAL_SHRINK for created SHM files

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Sealing is working not only for files created by memfd_create(),
but also on tmpfs files.
This commit is contained in:
Alexander Volkov 2019-02-18 15:28:22 +03:00
parent f6753c117e
commit 83b086a16e
1 changed files with 3 additions and 1 deletions
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4
Xext/shm.c
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@ -1207,7 +1207,6 @@ shm_tmpfile(void)
#ifdef HAVE_MEMFD_CREATE
fd = memfd_create("xorg", MFD_CLOEXEC|MFD_ALLOW_SEALING);
if (fd != -1) {
fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK);
DebugF ("Using memfd_create\n");
return fd;
}
@ -1274,6 +1273,9 @@ ProcShmCreateSegment(ClientPtr client)
close(fd);
return BadAlloc;
}
#if defined(F_ADD_SEALS) && defined(F_SEAL_SHRINK)
fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK);
#endif
shmdesc = malloc(sizeof(ShmDescRec));
if (!shmdesc) {
close(fd);