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| author | Daniel Borkmann <daniel@iogearbox.net> | 2019-05-23 16:20:58 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-05-23 16:20:59 +0200 |
| commit | 29c677c86a15fadcf85f072f75d88ce37ceac452 (patch) | |
| tree | f9b0f0dece13fb49d504ce72851404861c6b3849 /kernel | |
| parent | 9efc7794496d531593751a3fb008030d5f9ba87c (diff) | |
| parent | 7c9441066ab53168093c79477aabd575f7c14129 (diff) | |
Merge branch 'bpf-jmp-seq-limit'
Alexei Starovoitov says:
====================
Patch 1 - jmp sequence limit
Patch 2 - improve existing tests
Patch 3 - add pyperf-based realistic bpf program that takes
advantage of higher limit and use it as a stress test
v1->v2: fixed nit in patch 3. added Andrii's acks
====================
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/verifier.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 95f9354495ad..3f8b5443cc67 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -176,7 +176,7 @@ struct bpf_verifier_stack_elem { struct bpf_verifier_stack_elem *next; }; -#define BPF_COMPLEXITY_LIMIT_STACK 1024 +#define BPF_COMPLEXITY_LIMIT_JMP_SEQ 8192 #define BPF_COMPLEXITY_LIMIT_STATES 64 #define BPF_MAP_PTR_UNPRIV 1UL @@ -782,8 +782,9 @@ static struct bpf_verifier_state *push_stack(struct bpf_verifier_env *env, if (err) goto err; elem->st.speculative |= speculative; - if (env->stack_size > BPF_COMPLEXITY_LIMIT_STACK) { - verbose(env, "BPF program is too complex\n"); + if (env->stack_size > BPF_COMPLEXITY_LIMIT_JMP_SEQ) { + verbose(env, "The sequence of %d jumps is too complex.\n", + env->stack_size); goto err; } return &elem->st; |