diff options
| author | Song Liu <song@kernel.org> | 2023-11-07 05:57:23 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-11-10 04:07:38 +0100 |
| commit | 74523c06ae20b83c5508a98af62393ac34913362 (patch) | |
| tree | fed41c7eb41d0ded5f654e08fc939648363ddae9 /kernel/trace | |
| parent | bpf, lpm: Fix check prefixlen before walking trie (diff) | |
| download | linux-74523c06ae20b83c5508a98af62393ac34913362.tar.xz linux-74523c06ae20b83c5508a98af62393ac34913362.zip | |
bpf: Add __bpf_dynptr_data* for in kernel use
Different types of bpf dynptr have different internal data storage.
Specifically, SKB and XDP type of dynptr may have non-continuous data.
Therefore, it is not always safe to directly access dynptr->data.
Add __bpf_dynptr_data and __bpf_dynptr_data_rw to replace direct access to
dynptr->data.
Update bpf_verify_pkcs7_signature to use __bpf_dynptr_data instead of
dynptr->data.
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://lore.kernel.org/bpf/20231107045725.2278852-2-song@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 84e8a0f6e4e0..f0b8b7c29126 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1376,6 +1376,8 @@ __bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr_kern *data_ptr, struct bpf_dynptr_kern *sig_ptr, struct bpf_key *trusted_keyring) { + const void *data, *sig; + u32 data_len, sig_len; int ret; if (trusted_keyring->has_ref) { @@ -1392,10 +1394,12 @@ __bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr_kern *data_ptr, return ret; } - return verify_pkcs7_signature(data_ptr->data, - __bpf_dynptr_size(data_ptr), - sig_ptr->data, - __bpf_dynptr_size(sig_ptr), + data_len = __bpf_dynptr_size(data_ptr); + data = __bpf_dynptr_data(data_ptr, data_len); + sig_len = __bpf_dynptr_size(sig_ptr); + sig = __bpf_dynptr_data(sig_ptr, sig_len); + + return verify_pkcs7_signature(data, data_len, sig, sig_len, trusted_keyring->key, VERIFYING_UNSPECIFIED_SIGNATURE, NULL, NULL); |