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bpf: Fix verifier log for async callback return values

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The verifier, as part of check_return_code(), verifies that async
callbacks such as from e.g. timers, will return 0. It does this by
correctly checking that R0->var_off is in tnum_const(0), which
effectively checks that it's in a range of 0. If this condition fails,
however, it prints an error message which says that the value should
have been in (0x0; 0x1). This results in possibly confusing output such
as the following in which an async callback returns 1:

  At async callback the register R0 has value (0x1; 0x0) should have been in (0x0; 0x1)

The fix is easy -- we should just pass the tnum_const(0) as the correct
range to verbose_invalid_scalar(), which will then print the following:

  At async callback the register R0 has value (0x1; 0x0) should have been in (0x0; 0x0)

Fixes: bfc6bb74e4 ("bpf: Implement verifier support for validation of async callbacks.")
Signed-off-by: David Vernet <void@manifault.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20231009161414.235829-1-void@manifault.com
This commit is contained in:
David Vernet 2023-10-09 11:14:13 -05:00 committed by Daniel Borkmann
parent a12bbb3ccc
commit 829955981c
1 changed files with 3 additions and 3 deletions
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6
kernel/bpf/verifier.c
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@ -14479,7 +14479,7 @@ static int check_return_code(struct bpf_verifier_env *env)
struct tnum enforce_attach_type_range = tnum_unknown;
const struct bpf_prog *prog = env->prog;
struct bpf_reg_state *reg;
struct tnum range = tnum_range(0, 1);
struct tnum range = tnum_range(0, 1), const_0 = tnum_const(0);
enum bpf_prog_type prog_type = resolve_prog_type(env->prog);
int err;
struct bpf_func_state *frame = env->cur_state->frame[0];
@ -14527,8 +14527,8 @@ static int check_return_code(struct bpf_verifier_env *env)
return -EINVAL;
}
if (!tnum_in(tnum_const(0), reg->var_off)) {
verbose_invalid_scalar(env, reg, &range, "async callback", "R0");
if (!tnum_in(const_0, reg->var_off)) {
verbose_invalid_scalar(env, reg, &const_0, "async callback", "R0");
return -EINVAL;
}
return 0;