diff options
| author | Toke Høiland-Jørgensen | 2022-01-07 23:11:13 +0100 |
|---|---|---|
| committer | Alexei Starovoitov | 2022-01-11 09:44:06 -0800 |
| commit | 382778edc8262b7535f00523e9eb22edba1b9816 (patch) | |
| tree | 5c20588a75ee236ddb87ff426cf198c11cf37b9f /net | |
| parent | 1e9d74660d4df625b0889e77018f9e94727ceacd (diff) | |
xdp: check prog type before updating BPF link
The bpf_xdp_link_update() function didn't check the program type before
updating the program, which made it possible to install any program type as
an XDP program, which is obviously not good. Syzbot managed to trigger this
by swapping in an LWT program on the XDP hook which would crash in a helper
call.
Fix this by adding a check and bailing out if the types don't match.
Fixes: 026a4c28e1db ("bpf, xdp: Implement LINK_UPDATE for BPF XDP link")
Reported-by: syzbot+983941aa85af6ded1fd9@syzkaller.appspotmail.com
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20220107221115.326171-1-toke@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 84a0d9542fe9..1baab07820f6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -8981,6 +8981,12 @@ static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, goto out_unlock; } old_prog = link->prog; + if (old_prog->type != new_prog->type || + old_prog->expected_attach_type != new_prog->expected_attach_type) { + err = -EINVAL; + goto out_unlock; + } + if (old_prog == new_prog) { /* no-op, don't disturb drivers */ bpf_prog_put(new_prog); |