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>

diff --git a/include/linux/filter.h b/include/linux/filter.h
index c050dcc322a43e2264bdaf49b3667a0b2e63c6ab..f65f5a69db8f8b93a4c85862748c0904350af576 100644 (file)
--- 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 dad2a178f9f8a477488f091962c5e771d1d117b3..6438f29ff26650b240be40d7d80953dc28f13cb0 100644 (file)
--- 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 d5bef0b0f63968bdfc906921bcc99522154750cc..a0e9cf6379de3eac8ac1182c3be73e8d140b4a1b 100644 (file)
--- 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();