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bpf: widening for callback iterators

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Callbacks are similar to open coded iterators, so add imprecise
widening logic for callback body processing. This makes callback based
loops behave identically to open coded iterators, e.g. allowing to
verify programs like below:

  struct ctx { u32 i; };
  int cb(u32 idx, struct ctx* ctx)
  {
          ++ctx->i;
          return 0;
  }
  ...
  struct ctx ctx = { .i = 0 };
  bpf_loop(100, cb, &ctx, 0);
  ...

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20231121020701.26440-9-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-11-21 04:06:58 +02:00 committed by Alexei Starovoitov
parent 958465e217
commit cafe2c2150
1 changed files with 22 additions and 2 deletions
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24
kernel/bpf/verifier.c
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@ -9799,9 +9799,10 @@ static bool in_rbtree_lock_required_cb(struct bpf_verifier_env *env)
static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
{
struct bpf_verifier_state *state = env->cur_state;
struct bpf_verifier_state *state = env->cur_state, *prev_st;
struct bpf_func_state *caller, *callee;
struct bpf_reg_state *r0;
bool in_callback_fn;
int err;
callee = state->frame[state->curframe];
@ -9856,7 +9857,8 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
* there function call logic would reschedule callback visit. If iteration
* converges is_state_visited() would prune that visit eventually.
*/
if (callee->in_callback_fn)
in_callback_fn = callee->in_callback_fn;
if (in_callback_fn)
*insn_idx = callee->callsite;
else
*insn_idx = callee->callsite + 1;
@ -9871,6 +9873,24 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
* bpf_throw, this will be done by copy_verifier_state for extra frames. */
free_func_state(callee);
state->frame[state->curframe--] = NULL;
/* for callbacks widen imprecise scalars to make programs like below verify:
*
* struct ctx { int i; }
* void cb(int idx, struct ctx *ctx) { ctx->i++; ... }
* ...
* struct ctx = { .i = 0; }
* bpf_loop(100, cb, &ctx, 0);
*
* This is similar to what is done in process_iter_next_call() for open
* coded iterators.
*/
prev_st = in_callback_fn ? find_prev_entry(env, state, *insn_idx) : NULL;
if (prev_st) {
err = widen_imprecise_scalars(env, prev_st, state);
if (err)
return err;
}
return 0;
}