From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ralf Baechle Subject: [PATCH 1/4] NET: AX.25: Check ioctl arguments to avoid overflows further down the road. Date: Thu, 24 Nov 2011 16:12:59 +0000 Message-ID: <1d2adcd4eadb1f42926734cca5886dfad258aeb6.1322214950.git.ralf@linux-mips.org> References: Cc: netdev@vger.kernel.org, linux-hams@vger.kernel.org, Xi Wang , Joerg Reuter , Alan Cox , Thomas Osterried To: "David S. Miller" Return-path: Received: from h5.dl5rb.org.uk ([81.2.74.5]:52585 "EHLO linux-mips.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754595Ab1KYLJ4 (ORCPT ); Fri, 25 Nov 2011 06:09:56 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: Very large, nonsenical arguments or use in very extreme conditions could result in integer overflows. Check ioctls arguments to avoid such overflows and return -EINVAL for too large arguments. To allow the use of AX.25 for even the most extreme setup (think packet radio to the Phase 5E mars probe) we make no further attempt to clamp the argument range. Originally reported by Fan Long and a first patch was sent by Xi Wang . Signed-off-by: Ralf Baechle Cc: Xi Wang Cc: Joerg Reuter Cc: Alan Cox Cc: Thomas Osterried --- net/ax25/af_ax25.c | 17 +++++++++++------ 1 files changed, 11 insertions(+), 6 deletions(-) diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index e7c69f4..b863c18 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -402,14 +402,14 @@ static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) break; case AX25_T1: - if (ax25_ctl.arg < 1) + if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) goto einval_put; ax25->rtt = (ax25_ctl.arg * HZ) / 2; ax25->t1 = ax25_ctl.arg * HZ; break; case AX25_T2: - if (ax25_ctl.arg < 1) + if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ) goto einval_put; ax25->t2 = ax25_ctl.arg * HZ; break; @@ -422,10 +422,15 @@ static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) break; case AX25_T3: + if (ax25_ctl.arg > ULONG_MAX / HZ) + goto einval_put; ax25->t3 = ax25_ctl.arg * HZ; break; case AX25_IDLE: + if (ax25_ctl.arg > ULONG_MAX / (60 * HZ)) + goto einval_put; + ax25->idle = ax25_ctl.arg * 60 * HZ; break; @@ -571,7 +576,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname, break; case AX25_T1: - if (opt < 1) { + if (opt < 1 || opt > ULONG_MAX / HZ) { res = -EINVAL; break; } @@ -580,7 +585,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname, break; case AX25_T2: - if (opt < 1) { + if (opt < 1 || opt > ULONG_MAX / HZ) { res = -EINVAL; break; } @@ -596,7 +601,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname, break; case AX25_T3: - if (opt < 1) { + if (opt < 1 || opt > ULONG_MAX / HZ) { res = -EINVAL; break; } @@ -604,7 +609,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname, break; case AX25_IDLE: - if (opt < 0) { + if (opt < 0 || opt > ULONG_MAX / (60 * HZ)) { res = -EINVAL; break; } -- 1.7.4.4