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pipewire: mem: try to create non-executable memfds

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Executable memfds can be a security issue.

The kernel warns about them like the following:
pipewire: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set

Explicitly create all memfds a non-executable as they are not meant to
be executed, similar to the other possible backing filetypes.
This commit is contained in:
Thomas Weißschuh 2023-11-29 18:51:48 +01:00
parent 9fdf221705
commit 6ae9698ebc
1 changed files with 27 additions and 1 deletions
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28
src/pipewire/mem.c
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@ -57,6 +57,32 @@ static inline int memfd_create(const char *name, unsigned int flags)
#define MFD_ALLOW_SEALING 0x0002U
#endif
#ifndef MFD_HUGETLB
#define MFD_HUGETLB 0x0004U
#endif
#ifndef MFD_NOEXEC_SEAL
#define MFD_NOEXEC_SEAL 0x0008U
#endif
#ifndef MFD_EXEC
#define MFD_EXEC 0x0010U
#endif
#ifdef HAVE_MEMFD_CREATE
static int pw_memfd_create(const char *name, unsigned int flags)
{
int res;
res = memfd_create(name, flags);
if (res == -1 && errno == EINVAL && flags & MFD_NOEXEC_SEAL)
res = memfd_create(name, flags & ~MFD_NOEXEC_SEAL);
return res;
}
#endif
/* fcntl() seals-related flags */
#ifndef F_LINUX_SPECIFIC_BASE
@ -489,7 +515,7 @@ struct pw_memblock * pw_mempool_alloc(struct pw_mempool *pool, enum pw_memblock_
"pipewire-memfd:flags=0x%08x,type=%" PRIu32 ",size=%zu",
(unsigned int) flags, type, size);
b->this.fd = memfd_create(name, MFD_CLOEXEC | MFD_ALLOW_SEALING);
b->this.fd = pw_memfd_create(name, MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_NOEXEC_SEAL);
if (b->this.fd == -1) {
res = -errno;
pw_log_error("%p: Failed to create memfd: %m", pool);