diff mbox

ipv4: Fix ip_getsockopt for IP_PKTOPTIONS

Message ID 1312672850-13676-1-git-send-email-dbaluta@ixiacom.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Daniel Baluta Aug. 6, 2011, 11:20 p.m. UTC 
IP_PKTOPTIONS is broken for 32-bit applications running
in COMPAT mode on 64-bit kernels.

This happens because msghdr's msg_flags field is always
set to zero. When running in COMPAT mode this should be
set to MSG_CMSG_COMPAT instead.

Signed-off-by: Tiberiu Szocs-Mihai <tszocs@ixiacom.com>
Signed-off-by: Daniel Baluta <dbaluta@ixiacom.com>
---
 net/ipv4/ip_sockglue.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

Comments

David Miller Aug. 8, 2011, 5:31 a.m. UTC | #1 
From: Daniel Baluta <dbaluta@ixiacom.com>
Date: Sun,  7 Aug 2011 02:20:50 +0300

> IP_PKTOPTIONS is broken for 32-bit applications running
> in COMPAT mode on 64-bit kernels.
> 
> This happens because msghdr's msg_flags field is always
> set to zero. When running in COMPAT mode this should be
> set to MSG_CMSG_COMPAT instead.
> 
> Signed-off-by: Tiberiu Szocs-Mihai <tszocs@ixiacom.com>
> Signed-off-by: Daniel Baluta <dbaluta@ixiacom.com>

Applied, thanks.
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diff mbox

Patch

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index ab0c9ef..c77f5a8 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1067,7 +1067,7 @@  EXPORT_SYMBOL(compat_ip_setsockopt);
  */
 
 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, int __user *optlen)
+			    char __user *optval, int __user *optlen, unsigned flags)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	int val;
@@ -1240,7 +1240,7 @@  static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 
 		msg.msg_control = optval;
 		msg.msg_controllen = len;
-		msg.msg_flags = 0;
+		msg.msg_flags = flags;
 
 		if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
 			struct in_pktinfo info;
@@ -1294,7 +1294,7 @@  int ip_getsockopt(struct sock *sk, int level,
 {
 	int err;
 
-	err = do_ip_getsockopt(sk, level, optname, optval, optlen);
+	err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */
 	if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
@@ -1327,7 +1327,8 @@  int compat_ip_getsockopt(struct sock *sk, int level, int optname,
 		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
 			ip_getsockopt);
 
-	err = do_ip_getsockopt(sk, level, optname, optval, optlen);
+	err = do_ip_getsockopt(sk, level, optname, optval, optlen, 
+		MSG_CMSG_COMPAT);
 
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */