Commit f2377d4e authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Linus Torvalds

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: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: default avatarAndrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 527f215b
......@@ -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))
......
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