Lorenzo Stoakes fa00b8ef18 mm: perform all memfd seal checks in a single place ... We no longer actually need to perform these checks in the f_op->mmap() hook any longer. We already moved the operation which clears VM_MAYWRITE on a read-only mapping of a write-sealed memfd in order to work around the restrictions imposed by commit 5de195060b ("mm: resolve faulty mmap_region() error path behaviour"). There is no reason for us not to simply go ahead and additionally check to see if any pre-existing seals are in place here rather than defer this to the f_op->mmap() hook. By doing this we remove more logic from shmem_mmap() which doesn't belong there, as well as doing the same for hugetlbfs_file_mmap(). We also remove dubious shared logic in mm.h which simply does not belong there either. It makes sense to do these checks at the earliest opportunity, we know these are shmem (or hugetlbfs) mappings whose relevant VMA flags will not change from the invoking do_mmap() so there is simply no need to wait. This also means the implementation of further memfd seal flags can be done within mm/memfd.c and also have the opportunity to modify VMA flags as necessary early in the mapping logic. [lorenzo.stoakes@oracle.com: fix typos in !memfd inline stub] Link: https://lkml.kernel.org/r/7dee6c5d-480b-4c24-b98e-6fa47dbd8a23@lucifer.local Link: https://lkml.kernel.org/r/20241206212846.210835-1-lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Tested-by: Isaac J. Manjarres <isaacmanjarres@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jann Horn <jannh@google.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: Liam R. Howlett <Liam.Howlett@Oracle.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Jeff Xu <jeffxu@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2025-01-13 22:40:51 -08:00
..
acpi	common: switch back from remove_new() to remove() callback	2024-11-25 17:31:39 -08:00
asm-generic	- Fix a case where posix timers with a thread-group-wide target would miss	2024-12-01 12:41:21 -08:00
clocksource	x86/hyperv: Fix hv tsc page based sched_clock for hibernation	2024-12-09 18:42:42 +00:00
crypto	…
cxl	…
drm	Merge tag 'drm-misc-fixes-2024-12-05' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-fixes	2024-12-06 08:40:47 +10:00
dt-bindings	Char/Misc/IIO/Whatever driver subsystem updates for 6.13-rc1	2024-11-29 11:58:27 -08:00
keys	…
kunit	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
kvm	…
linux	mm: perform all memfd seal checks in a single place	2025-01-13 22:40:51 -08:00
math-emu	…
media	…
memory	…
misc	…
net	Nothing major here. Over the last two weeks we gathered only around	2025-01-03 14:36:54 -08:00
pcmcia	…
ras	…
rdma	…
rv	…
scsi	…
soc	ARC fixes for 6.13-r32 or rc4	2024-12-15 15:38:12 -08:00
sound	ALSA: hda: cs35l56: Remove calls to cs35l56_force_sync_asp1_registers_from_cache()	2024-12-06 13:54:06 +01:00
target	…
trace	mm: mmap_lock: optimize mmap_lock tracepoints	2025-01-13 22:40:34 -08:00
uapi	Nothing major here. Over the last two weeks we gathered only around	2025-01-03 14:36:54 -08:00
ufs	scsi: ufs: core: Add missing post notify for power mode change	2024-12-04 13:22:59 -05:00
vdso	…
video	…
xen	…