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authorVincenzo Frascino <vincenzo.frascino@arm.com>2021-02-05 05:32:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-05 22:03:47 +0300
commitb99acdcbfe3c8394ddd8b8d89d9bae2bbba4a459 (patch)
tree325e9a188b825c56a66b7ba52f07ead2e284e299 /mm/kasan
parent49c6631d3b4f61a7b5bb0453a885a12bfa06ffd8 (diff)
downloadlinux-b99acdcbfe3c8394ddd8b8d89d9bae2bbba4a459.tar.xz
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@arm.com Fixes: 2e903b91479782b7 ("kasan, arm64: implement HW_TAGS runtime") Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Leon Romanovsky <leonro@mellanox.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Naresh Kamboju <naresh.kamboju@linaro.org> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/kasan.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index cc4d9e1d49b1..8c706e7652f2 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -209,7 +209,7 @@ bool check_memory_region(unsigned long addr, size_t size, bool write,
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 */