The patch titled Subject: mseal: fix is_madv_discard() has been added to the -mm mm-hotfixes-unstable branch. Its filename is mseal-fix-is_madv_discard.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: Pedro Falcato pedro.falcato@gmail.com Subject: mseal: fix is_madv_discard() Date: Wed, 7 Aug 2024 18:33:35 +0100
is_madv_discard did its check wrong. MADV_ flags are not bitwise, they're normal sequential numbers. So, for instance: behavior & (/* ... */ | MADV_REMOVE)
tagged both MADV_REMOVE and MADV_RANDOM (bit 0 set) as discard operations. This is obviously incorrect, so use a switch statement instead.
Link: https://lkml.kernel.org/r/20240807173336.2523757-1-pedro.falcato@gmail.com Link: https://lkml.kernel.org/r/20240807173336.2523757-2-pedro.falcato@gmail.com Fixes: 8be7258aad44 ("mseal: add mseal syscall") Signed-off-by: Pedro Falcato pedro.falcato@gmail.com Cc: Jeff Xu jeffxu@chromium.org Cc: Kees Cook kees@kernel.org Cc: Liam R. Howlett Liam.Howlett@oracle.com Cc: Shuah Khan shuah@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/mseal.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
--- a/mm/mseal.c~mseal-fix-is_madv_discard +++ a/mm/mseal.c @@ -40,9 +40,17 @@ static bool can_modify_vma(struct vm_are
static bool is_madv_discard(int behavior) { - return behavior & - (MADV_FREE | MADV_DONTNEED | MADV_DONTNEED_LOCKED | - MADV_REMOVE | MADV_DONTFORK | MADV_WIPEONFORK); + switch (behavior) { + case MADV_FREE: + case MADV_DONTNEED: + case MADV_DONTNEED_LOCKED: + case MADV_REMOVE: + case MADV_DONTFORK: + case MADV_WIPEONFORK: + return true; + } + + return false; }
static bool is_ro_anon(struct vm_area_struct *vma) _
Patches currently in -mm which might be from pedro.falcato@gmail.com are
mseal-fix-is_madv_discard.patch selftests-mm-add-mseal-test-for-no-discard-madvise.patch