The patch titled
Subject: kmsan: do not wipe out origin when doing partial unpoisoning
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
kmsan-do-not-wipe-out-origin-when-doing-partial-unpoisoning.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kmsan-do-not-wipe-out-origin-when-doing-partial-unpoisoning.patch
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: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: kmsan: do not wipe out origin when doing partial unpoisoning
Date: Tue, 28 May 2024 12:48:06 +0200
As noticed by Brian, KMSAN should not be zeroing the origin when
unpoisoning parts of a four-byte uninitialized value, e.g.:
char a[4];
kmsan_unpoison_memory(a, 1);
This led to false negatives, as certain poisoned values could receive zero
origins, preventing those values from being reported.
To fix the problem, check that kmsan_internal_set_shadow_origin() writes
zero origins only to slots which have zero shadow.
Link: https://lkml.kernel.org/r/20240528104807.738758-1-glider@xxxxxxxxxx
Fixes: f80be4571b19 ("kmsan: add KMSAN runtime core")
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Reported-by: Brian Johannesmeyer <bjohannesmeyer@xxxxxxxxx>
Link: https://lore.kernel.org/lkml/20240524232804.1984355-1-bjohannesmeyer@xxxxxxxxx/T/
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Tested-by: Brian Johannesmeyer <bjohannesmeyer@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmsan/core.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
--- a/mm/kmsan/core.c~kmsan-do-not-wipe-out-origin-when-doing-partial-unpoisoning
+++ a/mm/kmsan/core.c
@@ -196,8 +196,7 @@ void kmsan_internal_set_shadow_origin(vo
u32 origin, bool checked)
{
u64 address = (u64)addr;
- void *shadow_start;
- u32 *origin_start;
+ u32 *shadow_start, *origin_start;
size_t pad = 0;
KMSAN_WARN_ON(!kmsan_metadata_is_contiguous(addr, size));
@@ -225,8 +224,16 @@ void kmsan_internal_set_shadow_origin(vo
origin_start =
(u32 *)kmsan_get_metadata((void *)address, KMSAN_META_ORIGIN);
- for (int i = 0; i < size / KMSAN_ORIGIN_SIZE; i++)
- origin_start[i] = origin;
+ /*
+ * If the new origin is non-zero, assume that the shadow byte is also non-zero,
+ * and unconditionally overwrite the old origin slot.
+ * If the new origin is zero, overwrite the old origin slot iff the
+ * corresponding shadow slot is zero.
+ */
+ for (int i = 0; i < size / KMSAN_ORIGIN_SIZE; i++) {
+ if (origin || !shadow_start[i])
+ origin_start[i] = origin;
+ }
}
struct page *kmsan_vmalloc_to_page_or_null(void *vaddr)
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
kmsan-do-not-wipe-out-origin-when-doing-partial-unpoisoning.patch
