diff options
| author |   Daniel Borkmann <daniel@iogearbox.net> | 2018-12-19 00:27:24 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-12-19 00:30:05 +0100 |
| commit | dd4bfda9cfd1b0b4aad8760fc027cc81e0c6787f (patch) | |
| tree | 70590ac2bacf2a40aec88e06aca9e924e48695ef /tools/testing | |
| parent | bpf: correct slot_type marking logic to allow more stack slot sharing (diff) | |
| parent | bpf: sk_msg, add tests for size field (diff) | |
Merge branch 'bpf-sk-msg-size-member'
John Fastabend says:
====================
This adds a size field to the sk_msg_md data structure used by SK_MSG
programs. Without this in the zerocopy case and in the copy case
where multiple iovs are in use its difficult to know how much data
can be pulled in. The normal method of reading data and data_end
only give the current contiguous buffer. BPF programs can attempt to
pull in extra data but have to guess if it exists. This can result
in multiple "guesses" its much better if we know upfront the size
of the sk_msg.
====================
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/bpf/test_verifier.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index cf242734e2eb..7865b94c02c4 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -1843,10 +1843,20 @@ static struct bpf_test tests[] = { .prog_type = BPF_PROG_TYPE_SK_SKB, }, { - "invalid 64B read of family in SK_MSG", + "valid access size in SK_MSG", + .insns = { + BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, + offsetof(struct sk_msg_md, size)), + BPF_EXIT_INSN(), + }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_SK_MSG, + }, + { + "invalid 64B read of size in SK_MSG", .insns = { BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1, - offsetof(struct sk_msg_md, family)), + offsetof(struct sk_msg_md, size)), BPF_EXIT_INSN(), }, .errstr = "invalid bpf_context access", @@ -1857,7 +1867,7 @@ static struct bpf_test tests[] = { "invalid read past end of SK_MSG", .insns = { BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, - offsetof(struct sk_msg_md, local_port) + 4), + offsetof(struct sk_msg_md, size) + 4), BPF_EXIT_INSN(), }, .errstr = "R0 !read_ok", |