The patch titled
Subject: kasan: make addr_has_metadata() return true for valid addresses
has been added to the -mm tree. Its filename is
kasan-make-addr_has_metadata-return-true-for-valid-addresses.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-make-addr_has_metadata-return-true-for-valid-addresses.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-make-addr_has_metadata-return-true-for-valid-addresses.patch
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------------------------------------------------------
From: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Subject: kasan: make addr_has_metadata() return true for valid addresses
Currently, addr_has_metadata() returns true for every address. An invalid
address (e.g. NULL) passed to the function when, KASAN_HW_TAGS is
enabled, leads to a kernel panic.
Make addr_has_metadata() return true for valid addresses only.
Note: KASAN_HW_TAGS support for vmalloc will be added with a future patch.
Link: https://lkml.kernel.org/r/20210126134409.47894-3-vincenzo.frascino@xxxxxxx
Fixes: 2e903b91479782b7 ("kasan, arm64: implement HW_TAGS runtime")
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
Cc: "Paul E . McKenney" <paulmck@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/kasan.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/kasan/kasan.h~kasan-make-addr_has_metadata-return-true-for-valid-addresses
+++ a/mm/kasan/kasan.h
@@ -209,7 +209,7 @@ bool check_memory_region(unsigned long a
static inline bool addr_has_metadata(const void *addr)
{
- return true;
+ return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
}
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
_
Patches currently in -mm which might be from vincenzo.frascino@xxxxxxx are
kasan-add-explicit-preconditions-to-kasan_report.patch
kasan-make-addr_has_metadata-return-true-for-valid-addresses.patch
