diff options
| author | Dev Jain <dev.jain@arm.com> | 2025-10-28 12:09:52 +0530 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-11-09 21:19:44 -0800 |
| commit | 04d1c9d60c6ec4c0003d433572eaa45f8b217788 (patch) | |
| tree | a63ba9b2ca15a2dd91458b2f704ed1f6890928a2 /net/unix/af_unix.c | |
| parent | ec4d11fc4b2dd4a2fa8c9d801ee9753b74623554 (diff) | |
mm/mremap: honour writable bit in mremap pte batching
Currently mremap folio pte batch ignores the writable bit during figuring
out a set of similar ptes mapping the same folio. Suppose that the first
pte of the batch is writable while the others are not - set_ptes will end
up setting the writable bit on the other ptes, which is a violation of
mremap semantics. Therefore, use FPB_RESPECT_WRITE to check the writable
bit while determining the pte batch.
Link: https://lkml.kernel.org/r/20251028063952.90313-1-dev.jain@arm.com
Signed-off-by: Dev Jain <dev.jain@arm.com>
Fixes: f822a9a81a31 ("mm: optimize mremap() by PTE batching")
Reported-by: David Hildenbrand <david@redhat.com>
Debugged-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org> [6.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions