bianbu-repo-mirror/bianbu-linux-6.6
1
0
Fork 0
mirror of https://gitee.com/bianbu-linux/linux-6.6 synced 2025-04-24 14:07:52 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

selftests/bpf: Test allowing NULL buffer in dynptr slice

Browse source 
bpf_dynptr_slice(_rw) no longer requires a buffer for verification. If the
buffer is needed, but not present, the function will return NULL.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Link: https://lore.kernel.org/r/20230506013134.2492210-3-drosen@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Rosenberg 2023-05-05 18:31:31 -07:00 • committed by Alexei Starovoitov
parent 3bda08b636
commit 1ce33b6c84
2 changed files with 18 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
tools/testing/selftests/bpf/prog_tests/dynptr.c
View file

@ -26,6 +26,7 @@ static struct {
{"test_dynptr_is_null", SETUP_SYSCALL_SLEEP}, {"test_dynptr_is_null", SETUP_SYSCALL_SLEEP},
{"test_dynptr_is_rdonly", SETUP_SKB_PROG}, {"test_dynptr_is_rdonly", SETUP_SKB_PROG},
{"test_dynptr_clone", SETUP_SKB_PROG}, {"test_dynptr_clone", SETUP_SKB_PROG},
{"test_dynptr_skb_no_buff", SETUP_SKB_PROG},
}; };
static void verify_success(const char *prog_name, enum test_setup_type setup_type) static void verify_success(const char *prog_name, enum test_setup_type setup_type)

17
tools/testing/selftests/bpf/progs/dynptr_success.c
View file

@ -505,3 +505,20 @@ int test_dynptr_clone(struct __sk_buff *skb)
return 0; return 0;
} }
SEC("?cgroup_skb/egress")
int test_dynptr_skb_no_buff(struct __sk_buff *skb)
{
struct bpf_dynptr ptr;
__u64 *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, 1);
return !!data;
}