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| author | Jiong Wang <jiong.wang@netronome.com> | 2018-11-08 12:08:42 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-11-09 11:16:31 +0300 |
| commit | e647815a4d3b3be9d85b5750ed0f2947fd78fac7 (patch) | |
| tree | 3f5c73cd81f673cacdd375e1e3f5381b5ce1c296 /include/linux/bpf.h | |
| parent | bce6a14996f991e570d973179b5ff57544efaa9a (diff) | |
| download | linux-e647815a4d3b3be9d85b5750ed0f2947fd78fac7.tar.xz | |
bpf: let verifier to calculate and record max_pkt_offset
In check_packet_access, update max_pkt_offset after the offset has passed
__check_packet_access.
It should be safe to use u32 for max_pkt_offset as explained in code
comment.
Also, when there is tail call, the max_pkt_offset of the called program is
unknown, so conservatively set max_pkt_offset to MAX_PACKET_OFF for such
case.
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/linux/bpf.h')
| -rw-r--r-- | include/linux/bpf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 33014ae73103..b6a296e01f6a 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -293,6 +293,7 @@ struct bpf_prog_aux { atomic_t refcnt; u32 used_map_cnt; u32 max_ctx_offset; + u32 max_pkt_offset; u32 stack_depth; u32 id; u32 func_cnt; |