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selftests: bpf: fix test_kfunc_dynptr_param

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As verifier now assumes that all kfuncs only takes trusted pointer
arguments, passing 0 (NULL) to a kfunc that doesn't mark the argument as
__nullable or __opt will be rejected with a failure message of: Possibly
NULL pointer passed to trusted arg<n>

Pass a non-null value to the kfunc to test the expected failure mode.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260102180038.2708325-9-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Puranjay Mohan 2026-01-02 10:00:34 -08:00 committed by Alexei Starovoitov
parent 03cc77b10e
commit 230b0118e4
1 changed files with 2 additions and 3 deletions
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5
tools/testing/selftests/bpf/progs/test_kfunc_dynptr_param.c
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@ -48,10 +48,9 @@ SEC("?lsm.s/bpf")
__failure __msg("arg#0 expected pointer to stack or const struct bpf_dynptr")
int BPF_PROG(not_ptr_to_stack, int cmd, union bpf_attr *attr, unsigned int size, bool kernel)
{
unsigned long val = 0;
static struct bpf_dynptr val;
return bpf_verify_pkcs7_signature((struct bpf_dynptr *)val,
(struct bpf_dynptr *)val, NULL);
return bpf_verify_pkcs7_signature(&val, &val, NULL);
}
SEC("lsm.s/bpf")