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| author | Daniel Borkmann <daniel@iogearbox.net> | 2016-10-20 18:13:53 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-20 21:39:06 +0300 |
| commit | 0d906b1e8d4002cdd59590fec630f4e75023e288 (patch) | |
| tree | bf8e18e99469f584989b847b7f8e0101ed7913f5 | |
| parent | fcd91dd449867c6bfe56a81cabba76b829fd05cd (diff) | |
| download | linux-0d906b1e8d4002cdd59590fec630f4e75023e288.tar.xz | |
bpf, test: fix ld_abs + vlan push/pop stress test
After commit 636c2628086e ("net: skbuff: Remove errornous length
validation in skb_vlan_pop()") mentioned test case stopped working,
throwing a -12 (ENOMEM) return code. The issue however is not due to
636c2628086e, but rather due to a buggy test case that got uncovered
from the change in behaviour in 636c2628086e.
The data_size of that test case for the skb was set to 1. In the
bpf_fill_ld_abs_vlan_push_pop() handler bpf insns are generated that
loop with: reading skb data, pushing 68 tags, reading skb data,
popping 68 tags, reading skb data, etc, in order to force a skb
expansion and thus trigger that JITs recache skb->data. Problem is
that initial data_size is too small.
While before 636c2628086e, the test silently bailed out due to the
skb->len < VLAN_ETH_HLEN check with returning 0, and now throwing an
error from failing skb_ensure_writable(). Set at least minimum of
ETH_HLEN as an initial length so that on first push of data, equivalent
pop will succeed.
Fixes: 4d9c5c53ac99 ("test_bpf: add bpf_skb_vlan_push/pop() tests")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | lib/test_bpf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c index 94346b4d8984..0362da0b66c3 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -4831,7 +4831,7 @@ static struct bpf_test tests[] = { { }, INTERNAL, { 0x34 }, - { { 1, 0xbef } }, + { { ETH_HLEN, 0xbef } }, .fill_helper = bpf_fill_ld_abs_vlan_push_pop, }, /* |