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authorDaniel Borkmann <daniel@iogearbox.net>2017-06-11 00:50:41 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-11 01:05:45 +0200
commitd25da6caa2a1d6644360c40d7c5fd7c057551360 (patch)
tree4a44563771a6f4cd9704d34d840f8c02c86c22da /kernel/bpf/verifier.c
parentbpf: avoid excessive stack usage for perf_sample_data (diff)
downloadlinux-d25da6caa2a1d6644360c40d7c5fd7c057551360.tar.xz
linux-d25da6caa2a1d6644360c40d7c5fd7c057551360.zip
bpf: don't check spilled reg state for non-STACK_SPILLed type slots
spilled_regs[] state is only used for stack slots of type STACK_SPILL, never for STACK_MISC. Right now, in states_equal(), even if we have old and current stack state of type STACK_MISC, we compare spilled_regs[] for that particular offset. Just skip these like we do everywhere else. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--kernel/bpf/verifier.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 14ccb0759fa4..d031b3b0752e 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2828,6 +2828,8 @@ static bool states_equal(struct bpf_verifier_env *env,
return false;
if (i % BPF_REG_SIZE)
continue;
+ if (old->stack_slot_type[i] != STACK_SPILL)
+ continue;
if (memcmp(&old->spilled_regs[i / BPF_REG_SIZE],
&cur->spilled_regs[i / BPF_REG_SIZE],
sizeof(old->spilled_regs[0])))