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sock, diag: fix panic in sock_diag_put_filterinfo

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diag socket's sock_diag_put_filterinfo() dumps classic BPF programs
upon request to user space (ss -0 -b). However, native eBPF programs
attached to sockets (SO_ATTACH_BPF) cannot be dumped with this method:

Their orig_prog is always NULL. However, sock_diag_put_filterinfo()
unconditionally tries to access its filter length resp. wants to copy
the filter insns from there. Internal cBPF to eBPF transformations
attached to sockets don't have this issue, as orig_prog state is kept.

It's currently only used by packet sockets. If we would want to add
native eBPF support in the future, this needs to be done through
a different attribute than PACKET_DIAG_FILTER to not confuse possible
user space disassemblers that work on diag data.

Fixes: 89aa075832 ("net: sock: allow eBPF programs to be attached to sockets")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-09-02 14:00:36 +02:00 committed by David S. Miller
parent 20a17bf6c0
commit b382c08656
1 changed files with 3 additions and 0 deletions
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3
net/core/sock_diag.c
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@ -90,6 +90,9 @@ int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
goto out; goto out;
fprog = filter->prog->orig_prog; fprog = filter->prog->orig_prog;
if (!fprog)
goto out;
flen = bpf_classic_proglen(fprog); flen = bpf_classic_proglen(fprog);
attr = nla_reserve(skb, attrtype, flen); attr = nla_reserve(skb, attrtype, flen);