netdev - [PATCH 1/3] netfilter: Fix copy_to_user too small size parametre.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1330593390-19233-1-git-send-email-santoshprasadnayak@gmail.com>
Date:	Thu,  1 Mar 2012 14:46:30 +0530
From:	santosh nayak <santoshprasadnayak@...il.com>
To:	bart.de.schuymer@...dora.be
Cc:	pablo@...filter.org, kaber@...sh.net, shemminger@...tta.com,
	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Santosh Nayak <santoshprasadnayak@...il.com>
Subject: [PATCH 1/3] netfilter: Fix copy_to_user too small size parametre.

From: Santosh Nayak <santoshprasadnayak@...il.com>

While copying to userspace, the size of source is 29byte where as
size parametre is 32 byte.  Its leaking extra-information from
kernel space to user space.
Replace EBT_FUNCTION_MAXNAMELEN by XT_EXTENSION_MAXNAMELEN.

Signed-off-by: Santosh Nayak <santoshprasadnayak@...il.com>
---
 net/bridge/netfilter/ebtables.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 5864cc4..f3fcbd9 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1335,7 +1335,7 @@ static inline int ebt_make_matchname(const struct ebt_entry_match *m,
     const char *base, char __user *ubase)
 {
 	char __user *hlp = ubase + ((char *)m - base);
-	if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN))
+	if (copy_to_user(hlp, m->u.match->name, XT_EXTENSION_MAXNAMELEN))
 		return -EFAULT;
 	return 0;
 }
@@ -1344,7 +1344,7 @@ static inline int ebt_make_watchername(const struct ebt_entry_watcher *w,
     const char *base, char __user *ubase)
 {
 	char __user *hlp = ubase + ((char *)w - base);
-	if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN))
+	if (copy_to_user(hlp , w->u.watcher->name, XT_EXTENSION_MAXNAMELEN))
 		return -EFAULT;
 	return 0;
 }
@@ -1368,7 +1368,7 @@ ebt_make_names(struct ebt_entry *e, const char *base, char __user *ubase)
 	ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
 	if (ret != 0)
 		return ret;
-	if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN))
+	if (copy_to_user(hlp, t->u.target->name, XT_EXTENSION_MAXNAMELEN))
 		return -EFAULT;
 	return 0;
 }
-- 
1.7.4.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html