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tun: use socket locks for sk_{attach,detatch}_filter

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This reverts commit 5a5abb1fa3 ("tun, bpf: fix suspicious RCU usage
in tun_{attach, detach}_filter") and replaces it to use lock_sock around
sk_{attach,detach}_filter. The checks inside filter.c are updated with
lockdep_sock_is_held to check for proper socket locks.

It keeps the code cleaner by ensuring that only one lock governs the
socket filter instead of two independent locks.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa
2016-04-05 17:10:16 +02:00
committed by David S. Miller
parent 1e1d04e678
commit 8ced425ee6
3 changed files with 22 additions and 31 deletions
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4
include/linux/filter.h
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@@ -465,14 +465,10 @@ int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
void bpf_prog_destroy(struct bpf_prog *fp);
int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
int __sk_attach_filter(struct sock_fprog *fprog, struct sock *sk,
bool locked);
int sk_attach_bpf(u32 ufd, struct sock *sk);
int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
int sk_detach_filter(struct sock *sk);
int __sk_detach_filter(struct sock *sk, bool locked);
int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
unsigned int len);