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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2015-11-06 03:50:48 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 04:34:48 +0100 |
| commit | f2377d4eaab2aabe1938b3974b5b94f5ba4c7ead (patch) | |
| tree | db9db1fe308091e9c6063aaa3cf46673b2c244fb | |
| parent | mm/kasan: MODULE_VADDR is not available on all archs (diff) | |
| download | linux-f2377d4eaab2aabe1938b3974b5b94f5ba4c7ead.tar.xz linux-f2377d4eaab2aabe1938b3974b5b94f5ba4c7ead.zip | |
mm/kasan: don't use kasan shadow pointer in generic functions
We can't use generic functions like print_hex_dump to access kasan shadow
region. This require us to setup another kasan shadow region for the
address passed (kasan shadow address). Some architectures won't be able
to do that. Hence make a copy of the shadow region row and pass that to
generic functions.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/kasan/report.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/kasan/report.c b/mm/kasan/report.c index d269f2087faf..c5367089703c 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -164,14 +164,20 @@ static void print_shadow_for_address(const void *addr) for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_ROWS_AROUND_ADDR; i++) { const void *kaddr = kasan_shadow_to_mem(shadow_row); char buffer[4 + (BITS_PER_LONG/8)*2]; + char shadow_buf[SHADOW_BYTES_PER_ROW]; snprintf(buffer, sizeof(buffer), (i == 0) ? ">%p: " : " %p: ", kaddr); - + /* + * We should not pass a shadow pointer to generic + * function, because generic functions may try to + * access kasan mapping for the passed address. + */ kasan_disable_current(); + memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW); print_hex_dump(KERN_ERR, buffer, DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1, - shadow_row, SHADOW_BYTES_PER_ROW, 0); + shadow_buf, SHADOW_BYTES_PER_ROW, 0); kasan_enable_current(); if (row_is_guilty(shadow_row, shadow)) |