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authorAlexei Starovoitov <ast@plumgrid.com>2014-10-20 14:54:57 -0700
committerDavid S. Miller <davem@davemloft.net>2014-10-21 21:43:46 -0400
commit32bf08a6257b9c7380dcd040af3c0858eee3ef05 (patch)
treeb5928993937cb9bc095f6c3e0393eb63f6471308 /samples
parent78fd1d0ab072d4d9b5f0b7c14a1516665170b565 (diff)
downloadkernel-32bf08a6257b9c7380dcd040af3c0858eee3ef05.tar.gz
bpf: fix bug in eBPF verifier
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: f1bca824dabb ("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>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/test_verifier.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/samples/bpf/test_verifier.c b/samples/bpf/test_verifier.c
index f44ef11f65a7..eb4bec0ad8af 100644
--- a/samples/bpf/test_verifier.c
+++ b/samples/bpf/test_verifier.c
@@ -209,6 +209,17 @@ static struct bpf_test tests[] = {
.result = REJECT,
},
{
+ "program doesn't init R0 before exit in all branches",
+ .insns = {
+ BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 1),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 2),
+ BPF_EXIT_INSN(),
+ },
+ .errstr = "R0 !read_ok",
+ .result = REJECT,
+ },
+ {
"stack out of bounds",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, 8, 0),