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bpf: teach refsafe() to take into account ID remapping

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states_equal() check performs ID mapping between old and new states to
establish a 1-to-1 correspondence between IDs, even if their absolute
numberic values across two equivalent states differ. This is important
both for correctness and to avoid unnecessary work when two states are
equivalent.

With recent changes we partially fixed this logic by maintaining ID map
across all function frames. This patch also makes refsafe() check take
into account (and maintain) ID map, making states_equal() behavior more
optimal and correct.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20221223054921.958283-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2022-12-22 21:49:15 -08:00 committed by Alexei Starovoitov
parent cfca00767f
commit e8f55fcf77
1 changed files with 12 additions and 4 deletions

16
kernel/bpf/verifier.c

@ -13223,12 +13223,20 @@ static bool stacksafe(struct bpf_verifier_env *env, struct bpf_func_state *old,
return true;
}
static bool refsafe(struct bpf_func_state *old, struct bpf_func_state *cur)
static bool refsafe(struct bpf_func_state *old, struct bpf_func_state *cur,
struct bpf_id_pair *idmap)
{
int i;
if (old->acquired_refs != cur->acquired_refs)
return false;
return !memcmp(old->refs, cur->refs,
sizeof(*old->refs) * old->acquired_refs);
for (i = 0; i < old->acquired_refs; i++) {
if (!check_ids(old->refs[i].id, cur->refs[i].id, idmap))
return false;
}
return true;
}
/* compare two verifier states
@ -13270,7 +13278,7 @@ static bool func_states_equal(struct bpf_verifier_env *env, struct bpf_func_stat
if (!stacksafe(env, old, cur, env->idmap_scratch))
return false;
if (!refsafe(old, cur))
if (!refsafe(old, cur, env->idmap_scratch))
return false;
return true;