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bpf: disable 'optimize bpf_tail_call' for now 

The feature 'optimize-bpf_tail_call' result in kernel crash, therefore
disable it for now.

Signed-off-by: Menglong Dong <imagedong@tencent.com>
This commit is contained in:
Menglong Dong 2022-08-01 10:14:33 +08:00
parent 0d0688e57e
commit df683b6d5c
1 changed files with 0 additions and 21 deletions
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21
kernel/bpf/verifier.c
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@ -10541,27 +10541,6 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
insn->code = BPF_JMP | BPF_TAIL_CALL;
aux = &env->insn_aux_data[i + delta];
if (env->bpf_capable && !expect_blinding &&
prog->jit_requested &&
!bpf_map_key_poisoned(aux) &&
!bpf_map_ptr_poisoned(aux) &&
!bpf_map_ptr_unpriv(aux)) {
struct bpf_jit_poke_descriptor desc = {
.reason = BPF_POKE_REASON_TAIL_CALL,
.tail_call.map = BPF_MAP_PTR(aux->map_ptr_state),
.tail_call.key = bpf_map_key_immediate(aux),
};
ret = bpf_jit_add_poke_descriptor(prog, &desc);
if (ret < 0) {
verbose(env, "adding tail call poke descriptor failed\n");
return ret;
}
insn->imm = ret + 1;
continue;
}
if (!bpf_map_ptr_unpriv(aux))
continue;