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bpf: fix bug in eBPF verifier

Browse source 
while comparing for verifier state equivalency the comparison
was missing a check for uninitialized register.
Make sure it does so and add a testcase.

Fixes: f1bca824da ("bpf: add search pruning optimization to verifier")
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2014-10-20 14:54:57 -07:00 • committed by David S. Miller
commit 32bf08a625
2 changed files with 13 additions and 1 deletions
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3
kernel/bpf/verifier.c
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@ -1409,7 +1409,8 @@ static bool states_equal(struct verifier_state *old, struct verifier_state *cur)
if (memcmp(&old->regs[i], &cur->regs[i],
sizeof(old->regs[0])) != 0) {
if (old->regs[i].type == NOT_INIT ||
old->regs[i].type == UNKNOWN_VALUE)
(old->regs[i].type == UNKNOWN_VALUE &&
cur->regs[i].type != NOT_INIT))
continue;
return false;
}