diff options
Diffstat (limited to 'kernel/bpf/verifier.c')
| -rw-r--r-- | kernel/bpf/verifier.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index da285df492fd..6fd36a8ba1a0 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -6232,8 +6232,9 @@ static int propagate_liveness(struct bpf_verifier_env *env, const struct bpf_verifier_state *vstate, struct bpf_verifier_state *vparent) { - int i, frame, err = 0; + struct bpf_reg_state *state_reg, *parent_reg; struct bpf_func_state *state, *parent; + int i, frame, err = 0; if (vparent->curframe != vstate->curframe) { WARN(1, "propagate_live: parent frame %d current frame %d\n", @@ -6243,28 +6244,33 @@ static int propagate_liveness(struct bpf_verifier_env *env, /* Propagate read liveness of registers... */ BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); for (frame = 0; frame <= vstate->curframe; frame++) { + parent = vparent->frame[frame]; + state = vstate->frame[frame]; + parent_reg = parent->regs; + state_reg = state->regs; /* We don't need to worry about FP liveness, it's read-only */ for (i = frame < vstate->curframe ? BPF_REG_6 : 0; i < BPF_REG_FP; i++) { - if (vparent->frame[frame]->regs[i].live & REG_LIVE_READ) + if (parent_reg[i].live & REG_LIVE_READ) continue; - if (vstate->frame[frame]->regs[i].live & REG_LIVE_READ) { - err = mark_reg_read(env, &vstate->frame[frame]->regs[i], - &vparent->frame[frame]->regs[i]); - if (err) - return err; - } + if (!(state_reg[i].live & REG_LIVE_READ)) + continue; + err = mark_reg_read(env, &state_reg[i], &parent_reg[i]); + if (err) + return err; } /* Propagate stack slots. */ - state = vstate->frame[frame]; - parent = vparent->frame[frame]; for (i = 0; i < state->allocated_stack / BPF_REG_SIZE && i < parent->allocated_stack / BPF_REG_SIZE; i++) { - if (parent->stack[i].spilled_ptr.live & REG_LIVE_READ) + parent_reg = &parent->stack[i].spilled_ptr; + state_reg = &state->stack[i].spilled_ptr; + if (parent_reg->live & REG_LIVE_READ) continue; - if (state->stack[i].spilled_ptr.live & REG_LIVE_READ) - mark_reg_read(env, &state->stack[i].spilled_ptr, - &parent->stack[i].spilled_ptr); + if (!(state_reg->live & REG_LIVE_READ)) + continue; + err = mark_reg_read(env, state_reg, parent_reg); + if (err) + return err; } } return err; |