* [merged] kasan-mm-fix-resetting-page_alloc-tags-for-hw_tags.patch removed from -mm tree
@ 2021-01-25 21:35 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2021-01-25 21:35 UTC (permalink / raw)
To: andreyknvl, aryabinin, Branislav.Rankov, catalin.marinas,
dvyukov, elver, eugenis, glider, kevin.brodsky, mm-commits, pcc,
vincenzo.frascino, will.deacon
The patch titled
Subject: kasan, mm: fix resetting page_alloc tags for HW_TAGS
has been removed from the -mm tree. Its filename was
kasan-mm-fix-resetting-page_alloc-tags-for-hw_tags.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: kasan, mm: fix resetting page_alloc tags for HW_TAGS
A previous commit added resetting KASAN page tags to
kernel_init_free_pages() to avoid false-positives due to accesses to
metadata with the hardware tag-based mode.
That commit did reset page tags before the metadata access, but didn't
restore them after. As the result, KASAN fails to detect bad accesses to
page_alloc allocations on some configurations.
Fix this by recovering the tag after the metadata access.
Link: https://lkml.kernel.org/r/02b5bcd692e912c27d484030f666b350ad7e4ae4.1611074450.git.andreyknvl@google.com
Fixes: aa1ef4d7b3f6 ("kasan, mm: reset tags when accessing metadata")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/page_alloc.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/page_alloc.c~kasan-mm-fix-resetting-page_alloc-tags-for-hw_tags
+++ a/mm/page_alloc.c
@@ -1207,8 +1207,10 @@ static void kernel_init_free_pages(struc
/* s390's use of memset() could override KASAN redzones. */
kasan_disable_current();
for (i = 0; i < numpages; i++) {
+ u8 tag = page_kasan_tag(page + i);
page_kasan_tag_reset(page + i);
clear_highpage(page + i);
+ page_kasan_tag_set(page + i, tag);
}
kasan_enable_current();
}
_
Patches currently in -mm which might be from andreyknvl@google.com are
kasan-prefix-global-functions-with-kasan_.patch
kasan-clarify-hw_tags-impact-on-tbi.patch
kasan-clean-up-comments-in-tests.patch
kasan-add-macros-to-simplify-checking-test-constraints.patch
kasan-add-match-all-tag-tests.patch
kasan-arm64-allow-using-kunit-tests-with-hw_tags-mode.patch
kasan-rename-config_test_kasan_module.patch
kasan-add-compiler-barriers-to-kunit_expect_kasan_fail.patch
kasan-adapt-kmalloc_uaf2-test-to-hw_tags-mode.patch
kasan-fix-memory-corruption-in-kasan_bitops_tags-test.patch
kasan-move-_ret_ip_-to-inline-wrappers.patch
kasan-fix-bug-detection-via-ksize-for-hw_tags-mode.patch
kasan-add-proper-page-allocator-tests.patch
kasan-add-a-test-for-kmem_cache_alloc-free_bulk.patch
kasan-dont-run-tests-when-kasan-is-not-enabled.patch
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-01-25 22:33 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-25 21:35 [merged] kasan-mm-fix-resetting-page_alloc-tags-for-hw_tags.patch removed from -mm tree akpm
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.