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bpf: harden sockmap program attach to ensure correct map type

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When attaching a program to sockmap we need to check map type
is correct.

Fixes: 174a79ff95 ("bpf: sockmap with sk redirect support")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2017-08-28 07:11:43 -07:00 • committed by David S. Miller
parent ed85054d34
commit 81374aaa26
3 changed files with 33 additions and 4 deletions
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3
kernel/bpf/sockmap.c
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@ -794,6 +794,9 @@ int sock_map_attach_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type)
struct bpf_stab *stab = container_of(map, struct bpf_stab, map);
struct bpf_prog *orig;
if (unlikely(map->map_type != BPF_MAP_TYPE_SOCKMAP))
return -EINVAL;
switch (type) {
case BPF_SK_SKB_STREAM_PARSER:
orig = xchg(&stab->bpf_parse, prog);