diff options
| author | Eduard Zingerman <eddyz87@gmail.com> | 2025-09-18 19:18:36 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-09-19 09:27:22 -0700 |
| commit | 12a23f93a50dad7f820ca4326c7e289e7e13fb9f (patch) | |
| tree | 7f1476cbe41a1a850517cb89c28ec6c21485d28b /kernel | |
| parent | 6cd21eb9adc924237a6f398a7f6c9f3da251df71 (diff) | |
bpf: remove redundant REG_LIVE_READ check in stacksafe()
stacksafe() is called in exact == NOT_EXACT mode only for states that
had been porcessed by clean_verifier_states(). The latter replaces
dead stack spills with a series of STACK_INVALID masks. Such masks are
already handled by stacksafe().
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250918-callchain-sensitive-liveness-v3-3-c3cd27bacc60@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/verifier.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 64186ea0839b..74a96a0d6c8a 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -18785,13 +18785,6 @@ static bool stacksafe(struct bpf_verifier_env *env, struct bpf_func_state *old, cur->stack[spi].slot_type[i % BPF_REG_SIZE])) return false; - if (!(old->stack[spi].spilled_ptr.live & REG_LIVE_READ) - && exact == NOT_EXACT) { - i += BPF_REG_SIZE - 1; - /* explored state didn't use this */ - continue; - } - if (old->stack[spi].slot_type[i % BPF_REG_SIZE] == STACK_INVALID) continue; |