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selftests/bpf: null checks for rdonly_untrusted_mem should be preserved

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Test case checking that verifier does not assume rdonly_untrusted_mem
values as not null.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250702073620.897517-2-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
This commit is contained in:
Eduard Zingerman 2025-07-02 00:36:20 -07:00 committed by Andrii Nakryiko
parent c3b9faac9b
commit a90f5f7370
1 changed files with 21 additions and 0 deletions
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21
tools/testing/selftests/bpf/progs/mem_rdonly_untrusted.c
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@ -174,4 +174,25 @@ int misaligned_access(void *ctx)
return combine(bpf_rdonly_cast(&global, 0) + 1);
}
__weak int return_one(void)
{
return 1;
}
SEC("socket")
__success
__retval(1)
int null_check(void *ctx)
{
int *p;
p = bpf_rdonly_cast(0, 0);
if (p == 0)
/* make this a function call to avoid compiler
* moving r0 assignment before check.
*/
return return_one();
return 0;
}
char _license[] SEC("license") = "GPL";