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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2013-06-05 15:30:55 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-10 22:23:32 -0700 |
| commit | ed13998c319b050fc9abdb73915859dfdbe1fb38 (patch) | |
| tree | 347c9ba28d34f2ab94823f8d52c0d223e00c036f | |
| parent | 92bb73ea2c434618a68a58a2f3a5c3fd0b660d18 (diff) | |
| download | linux-stable-ed13998c319b050fc9abdb73915859dfdbe1fb38.tar.gz linux-stable-ed13998c319b050fc9abdb73915859dfdbe1fb38.tar.bz2 linux-stable-ed13998c319b050fc9abdb73915859dfdbe1fb38.zip | |
sock_diag: fix filter code sent to userspace
Filters need to be translated to real BPF code for userland, like SO_GETFILTER.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/filter.h | 1 | ||||
| -rw-r--r-- | net/core/filter.c | 2 | ||||
| -rw-r--r-- | net/core/sock_diag.c | 9 |
3 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index c050dcc322a4..f65f5a69db8f 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -46,6 +46,7 @@ extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); extern int sk_detach_filter(struct sock *sk); extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen); extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len); +extern void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to); #ifdef CONFIG_BPF_JIT #include <stdarg.h> diff --git a/net/core/filter.c b/net/core/filter.c index dad2a178f9f8..6438f29ff266 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -778,7 +778,7 @@ int sk_detach_filter(struct sock *sk) } EXPORT_SYMBOL_GPL(sk_detach_filter); -static void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to) +void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to) { static const u16 decodes[] = { [BPF_S_ALU_ADD_K] = BPF_ALU|BPF_ADD|BPF_K, diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c index d5bef0b0f639..a0e9cf6379de 100644 --- a/net/core/sock_diag.c +++ b/net/core/sock_diag.c @@ -73,8 +73,13 @@ int sock_diag_put_filterinfo(struct user_namespace *user_ns, struct sock *sk, goto out; } - if (filter) - memcpy(nla_data(attr), filter->insns, len); + if (filter) { + struct sock_filter *fb = (struct sock_filter *)nla_data(attr); + int i; + + for (i = 0; i < filter->len; i++, fb++) + sk_decode_filter(&filter->insns[i], fb); + } out: rcu_read_unlock(); |