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bpf: extract same_callsites() as utility function

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Extract same_callsites() from clean_live_states() as a utility function.
This function would be used by the next patch in the set.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20231024000917.12153-3-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-10-24 03:09:12 +03:00 committed by Alexei Starovoitov
parent 3c4e420cb6
commit 4c97259abc
1 changed files with 15 additions and 5 deletions
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20
kernel/bpf/verifier.c
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@ -1830,6 +1830,20 @@ static struct bpf_verifier_state_list **explored_state(struct bpf_verifier_env *
return &env->explored_states[(idx ^ state->callsite) % state_htab_size(env)];
}
static bool same_callsites(struct bpf_verifier_state *a, struct bpf_verifier_state *b)
{
int fr;
if (a->curframe != b->curframe)
return false;
for (fr = a->curframe; fr >= 0; fr--)
if (a->frame[fr]->callsite != b->frame[fr]->callsite)
return false;
return true;
}
static void update_branch_counts(struct bpf_verifier_env *env, struct bpf_verifier_state *st)
{
while (st) {
@ -15909,18 +15923,14 @@ static void clean_live_states(struct bpf_verifier_env *env, int insn,
struct bpf_verifier_state *cur)
{
struct bpf_verifier_state_list *sl;
int i;
sl = *explored_state(env, insn);
while (sl) {
if (sl->state.branches)
goto next;
if (sl->state.insn_idx != insn ||
sl->state.curframe != cur->curframe)
!same_callsites(&sl->state, cur))
goto next;
for (i = 0; i <= cur->curframe; i++)
if (sl->state.frame[i]->callsite != cur->frame[i]->callsite)
goto next;
clean_verifier_state(env, &sl->state);
next:
sl = sl->next;