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shm: use MFD_NOEXEC_SEAL for shared memory

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ref: https://lore.kernel.org/lkml/20221207154939.2532830-4-jeffxu@google.com/

The new MFD_NOEXEC_SEAL and MFD_EXEC flags allows application to
set executable bit at creation time (memfd_create).

When MFD_NOEXEC_SEAL is set, memfd is created without executable bit
(mode:0666), and sealed with F_SEAL_EXEC, so it can't be chmod to
be executable (mode: 0777) after creation.

when MFD_EXEC flag is set, memfd is created with executable bit
(mode:0777), this is the same as the old behavior of memfd_create.

Signed-off-by: Rudi Heitbaum <rudi@heitbaum.com>
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/792>
This commit is contained in:
Rudi Heitbaum 2023-07-14 08:41:36 +00:00 • committed by PulseAudio Marge Bot
parent 84c53066c6
commit 7d063d6544
2 changed files with 5 additions and 1 deletions
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4
src/pulsecore/memfd-wrappers.h
View file

@ -66,4 +66,8 @@ static inline int memfd_create(const char *name, unsigned int flags) {
#endif /* HAVE_MEMFD && !HAVE_MEMFD_CREATE */ #endif /* HAVE_MEMFD && !HAVE_MEMFD_CREATE */
#ifndef MFD_NOEXEC_SEAL
#define MFD_NOEXEC_SEAL 0x0008U
#endif
#endif #endif

2
src/pulsecore/shm.c
View file

@ -164,7 +164,7 @@ static int sharedmem_create(pa_shm *m, pa_mem_type_t type, size_t size, mode_t m
#endif #endif
#ifdef HAVE_MEMFD #ifdef HAVE_MEMFD
case PA_MEM_TYPE_SHARED_MEMFD: case PA_MEM_TYPE_SHARED_MEMFD:
fd = memfd_create("pulseaudio", MFD_ALLOW_SEALING|MFD_CLOEXEC); fd = memfd_create("pulseaudio", MFD_ALLOW_SEALING|MFD_CLOEXEC|MFD_NOEXEC_SEAL);
break; break;
#endif #endif
default: default: