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CVE-2013-4343 net: use-after-free TUNSETIFF (rhbz 1007733 1007741)

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This commit is contained in:
Josh Boyer 2013-09-13 07:38:51 -04:00
parent d3179a38e0
commit 1d47aca0e1
2 changed files with 110 additions and 0 deletions
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9
kernel.spec
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@ -761,6 +761,9 @@ Patch25047: drm-radeon-Disable-writeback-by-default-on-ppc.patch
#CVE-2013-2897 rhbz 1000536 1002600 CVE-2013-2899 rhbz 1000373 1002604
Patch25099: HID-CVE-fixes.patch
#CVE-2013-4343 rhbz 1007733 1007741
Patch25100: tuntap-correctly-handle-error-in-tun_set_iff.patch
Patch25101: fix-arm-neon-xor.patch
# END OF PATCH DEFINITIONS
@ -1486,6 +1489,9 @@ ApplyPatch HID-CVE-fixes.patch
ApplyPatch fix-arm-neon-xor.patch
#CVE-2013-4343 rhbz 1007733 1007741
ApplyPatch tuntap-correctly-handle-error-in-tun_set_iff.patch
# END OF PATCH APPLICATIONS
%endif
@ -2287,6 +2293,9 @@ fi
# ||----w |
# || ||
%changelog
* Fri Sep 13 2013 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2013-4343 net: use-after-free TUNSETIFF (rhbz 1007733 1007741)
* Thu Sep 12 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.12.0-0.rc0.git23.1
- Linux v3.11-9747-gff812d7

101
tuntap-correctly-handle-error-in-tun_set_iff.patch Normal file
View File

@ -0,0 +1,101 @@
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From: Jason Wang <jasowang@redhat.com>
To: davem@davemloft.net, mst@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: wannes.rombouts@epitech.eu, Jason Wang <jasowang@redhat.com>
Subject: [PATCH net V2] tuntap: correctly handle error in tun_set_iff()
Date: Wed, 11 Sep 2013 18:09:48 +0800
Message-Id: <1378894188-8015-1-git-send-email-jasowang@redhat.com>
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Commit c8d68e6be1c3b242f1c598595830890b65cea64a
(tuntap: multiqueue support) only call free_netdev() on error in
tun_set_iff(). This causes several issues:
- memory of tun security were leaked
- use after free since the flow gc timer was not deleted and the tfile
were not detached
This patch solves the above issues.
Reported-by: Wannes Rombouts <wannes.rombouts@epitech.eu>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
- Changes from V1: shift 1 space for label err_free_netdev and keep
commit log under 70 chars per line.
- The patch were needed for stable kernel 3.8+.
---
drivers/net/tun.c | 11 ++++++++---
1 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index a639de8..807815f 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1641,11 +1641,11 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
INIT_LIST_HEAD(&tun->disabled);
err = tun_attach(tun, file, false);
if (err < 0)
- goto err_free_dev;
+ goto err_free_flow;
err = register_netdevice(tun->dev);
if (err < 0)
- goto err_free_dev;
+ goto err_detach;
if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
device_create_file(&tun->dev->dev, &dev_attr_owner) ||
@@ -1689,7 +1689,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
strcpy(ifr->ifr_name, tun->dev->name);
return 0;
- err_free_dev:
+err_detach:
+ tun_detach_all(dev);
+err_free_flow:
+ tun_flow_uninit(tun);
+ security_tun_dev_free_security(tun->security);
+err_free_dev:
free_netdev(dev);
return err;
}
--
1.7.1
--
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