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selftests/bpf: Accept mem from dynptr in helper funcs

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This ensures that buffers retrieved from dynptr_data are allowed to be
passed in to helpers that take mem, like bpf_strncmp

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Link: https://lore.kernel.org/r/20230506013134.2492210-6-drosen@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Rosenberg 2023-05-05 18:31:34 -07:00 • committed by Alexei Starovoitov
parent 2012c867c8
commit 798e48fc28
2 changed files with 22 additions and 0 deletions
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1
tools/testing/selftests/bpf/prog_tests/dynptr.c
View file

@ -27,6 +27,7 @@ static struct {
{"test_dynptr_is_rdonly", SETUP_SKB_PROG},
{"test_dynptr_clone", SETUP_SKB_PROG},
{"test_dynptr_skb_no_buff", SETUP_SKB_PROG},
{"test_dynptr_skb_strcmp", SETUP_SKB_PROG},
};
static void verify_success(const char *prog_name, enum test_setup_type setup_type)

21
tools/testing/selftests/bpf/progs/dynptr_success.c
View file

@ -522,3 +522,24 @@ int test_dynptr_skb_no_buff(struct __sk_buff *skb)
return !!data;
}
SEC("?cgroup_skb/egress")
int test_dynptr_skb_strcmp(struct __sk_buff *skb)
{
struct bpf_dynptr ptr;
char *data;
if (bpf_dynptr_from_skb(skb, 0, &ptr)) {
err = 1;
return 1;
}
/* This may return NULL. SKB may require a buffer */
data = bpf_dynptr_slice(&ptr, 0, NULL, 10);
if (data) {
bpf_strncmp(data, 10, "foo");
return 1;
}
return 1;
}