bpf: fix possible spectre-v1 in find_and_alloc_map()

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It's possible for userspace to control attr->map_type. Sanitize it when
using it as an array index to prevent an out-of-bounds value being used
under speculation.

Found by smatch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: netdev@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

...

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Mark Rutland 2018-05-03 17:04:59 +01:00 • committed by Daniel Borkmann

parent a8d7aa17bb

commit 9ef09e35e5

1 changed files with 6 additions and 3 deletions

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kernel/bpf/syscall.c

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