linux-kernel - [PATCH v11 02/12] net/compat.c,linux/filter.h: share compat_sock

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Message-Id: <1330140111-17201-2-git-send-email-wad@chromium.org>
Date:	Fri, 24 Feb 2012 21:21:41 -0600
From:	Will Drewry <wad@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
	kernel-hardening@...ts.openwall.com, netdev@...r.kernel.org,
	x86@...nel.org, arnd@...db.de, davem@...emloft.net, hpa@...or.com,
	mingo@...hat.com, oleg@...hat.com, peterz@...radead.org,
	rdunlap@...otime.net, mcgrathr@...omium.org, tglx@...utronix.de,
	luto@....edu, eparis@...hat.com, serge.hallyn@...onical.com,
	djm@...drot.org, scarybeasts@...il.com, indan@....nu,
	pmoore@...hat.com, akpm@...ux-foundation.org, corbet@....net,
	eric.dumazet@...il.com, markus@...omium.org,
	coreyb@...ux.vnet.ibm.com, keescook@...omium.org,
	Will Drewry <wad@...omium.org>
Subject: [PATCH v11 02/12] net/compat.c,linux/filter.h: share compat_sock_fprog

Any other users of bpf_*_filter that take a struct sock_fprog from
userspace will need to be able to also accept a compat_sock_fprog
if the arch supports compat calls.  This change let's the existing
compat_sock_fprog be shared.

Signed-off-by: Will Drewry <wad@...omium.org>

v11: introduction
---
 include/linux/filter.h |   11 +++++++++++
 net/compat.c           |    8 --------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index bdd02f9..f052f5c 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -10,6 +10,7 @@
 
 #ifdef __KERNEL__
 #include <linux/atomic.h>
+#include <linux/compat.h>
 #endif
 
 /*
@@ -135,6 +136,16 @@ struct sock_fprog {	/* Required for SO_ATTACH_FILTER. */
 
 #ifdef __KERNEL__
 
+#ifdef CONFIG_COMPAT
+/*
+ * A struct sock_filter is architecture independent.
+ */
+struct compat_sock_fprog {
+	u16		len;
+	compat_uptr_t	filter;		/* struct sock_filter * */
+};
+#endif
+
 struct sk_buff;
 struct sock;
 
diff --git a/net/compat.c b/net/compat.c
index 6def90e..c5c61c8 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -326,14 +326,6 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 	__scm_destroy(scm);
 }
 
-/*
- * A struct sock_filter is architecture independent.
- */
-struct compat_sock_fprog {
-	u16		len;
-	compat_uptr_t	filter;		/* struct sock_filter * */
-};
-
 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 				char __user *optval, unsigned int optlen)
 {
-- 
1.7.5.4

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