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Commit ed13998c authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

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: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 92bb73ea

include/linux/filter.h

+1 −0
Original line number Diff line number Diff line
@@ -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>

net/core/filter.c

+1 −1
Original line number Diff line number Diff line
@@ -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,

net/core/sock_diag.c

+7 −2
Original line number Diff line number Diff line
@@ -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();