The patch titled
Subject: mm/mempolicy: fix get_nodes out of bound access
has been added to the -mm mm-unstable branch. Its filename is
mm-mempolicy-fix-get_nodes-out-of-bound-access.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mempolicy-fix-get_nodes-out-of-bound-access.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Tianyu Li <tianyu.li@xxxxxxx>
Subject: mm/mempolicy: fix get_nodes out of bound access
Date: Wed, 1 Jun 2022 17:32:11 +0800
When user specified more nodes than supported, get_nodes will access nmask
array out of bounds.
Link: https://lkml.kernel.org/r/20220601093211.2970565-1-tianyu.li@xxxxxxx
Fixes: e130242dc351 ("mm: simplify compat numa syscalls")
Signed-off-by: Tianyu Li <tianyu.li@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/mempolicy.c~mm-mempolicy-fix-get_nodes-out-of-bound-access
+++ a/mm/mempolicy.c
@@ -1397,7 +1397,7 @@ static int get_nodes(nodemask_t *nodes,
unsigned long bits = min_t(unsigned long, maxnode, BITS_PER_LONG);
unsigned long t;
- if (get_bitmap(&t, &nmask[maxnode / BITS_PER_LONG], bits))
+ if (get_bitmap(&t, &nmask[(maxnode - 1) / BITS_PER_LONG], bits))
return -EFAULT;
if (maxnode - bits >= MAX_NUMNODES) {
_
Patches currently in -mm which might be from tianyu.li@xxxxxxx are
mm-mempolicy-fix-get_nodes-out-of-bound-access.patch
