77666 2005-01-12 05:17 0000 Kernel i386 SMP page fault handler privilege escalation (CAN-2005-0001) 2009-05-03 14:07:39 0000 1 1 1 Unclassified Gentoo Security Kernel unspecified All All RESOLVED FIXED http://lists.netsys.com/pipermail/full-disclosure/2005-January/030826.html [linux <2.6.11] P2 major --- 1 koon@gentoo.org security@gentoo.org jaervosz@gentoo.org kerframil@gmail.com kern-sec@gentoo.org tklauser@nuerscht.ch koon@gentoo.org 2005-01-12 05:17:10 0000 Summary : Locally exploitable flaw has been found in the Linux page fault handler code that allows users to gain root privileges if running on multiprocessor machine. See URL for details. koon@gentoo.org 2005-01-12 05:18:20 0000 *** Bug 76818 has been marked as a duplicate of this bug. *** tklauser@nuerscht.ch 2005-01-12 12:15:18 0000 It's fixed in Linus' BitKeeper tree: http://linus.bkbits.net:8080/linux-2.5/cset@1.2360.3.5?nav=index.html|ChangeSet@-1d tklauser@nuerscht.ch 2005-01-12 12:17:23 0000 Created an attachment (id=48335) Patch against 2.6.10 (possibly others) Taken from BitKeeper tklauser@nuerscht.ch 2005-01-12 13:27:21 0000 Marcelo fixed it in 2.4.29-rc2: http://article.gmane.org/gmane.linux.kernel/269997 tklauser@nuerscht.ch 2005-01-13 05:00:02 0000 The patch for 2.4 is also available separately. Description: http://linux.bkbits.net:8080/linux-2.4/cset@1.1571?nav=index.html|ChangeSet@-2d Patch: http://linux.bkbits.net:8080/linux-2.4/gnupatch@41e506aaVw2bDZGKjd-_ojNQi9cf6A tklauser@nuerscht.ch 2005-01-13 05:01:20 0000 Created an attachment (id=48389) Patch against 2.4.29 (possibly others) Taken from Bitkeeper tklauser@nuerscht.ch 2005-01-13 05:18:29 0000 (From update of attachment 48335) The patch does not apply on vanilla 2.6.10 kernels. Seems to work only with 2.6.11-rc? dsd@gentoo.org 2005-01-13 14:09:35 0000 This will be fixed in a new gentoo-dev-sources release that I'm just testing. Here's how I've done it: Had to remove the patch for the RLIMIT memlock dos issue described in bug 77094 Replaced it with Linus's version, http://dev.gentoo.org/~dsd/gentoo-dev-sources/release-10.05/dist/1130_rlimit-memlock-dos.patch Then added our stack fix: http://dev.gentoo.org/~dsd/gentoo-dev-sources/release-10.05/dist/1140_stack-resize.patch Both required a rediff. As already mentioned, I haven't tested this yet. Will get back to you in a bit whether this works ok or not. dsd@gentoo.org 2005-01-13 16:23:30 0000 Having some problems booting up... It might not be this patch causing it, possibly one of the others I have added. Debugging now. tocharian@gentoo.org 2005-01-14 01:11:31 0000 Fixed in ~x86 hardened-dev-sources-2.6.10-r2 dsd@gentoo.org 2005-01-14 13:31:36 0000 The 1130 patch I referenced breaks bootup for myself... random bootup progs get killed with sig11. Investigating... Adam, did you fix this another way? dsd@gentoo.org 2005-01-15 06:10:38 0000 This patch: http://linux.bkbits.net:8080/linux-2.6/cset@1.2273.1.9 alongside 1130 and 1140, solves it for me. plasmaroo@gentoo.org 2005-01-15 14:00:00 0000 Created an attachment (id=48581) 2.6 #77094 Update (Prerequisite) plasmaroo@gentoo.org 2005-01-15 14:01:25 0000 Created an attachment (id=48582) 2.6 Compound Patch plasmaroo@gentoo.org 2005-01-15 14:11:22 0000 Sidenote: For the #77094 patch (attachment #48581) remove the netfilter/ip_conntrack_proto_tcp.c hunk if you are patching for kernels that are < 2.6.10... dsd@gentoo.org 2005-01-17 07:28:28 0000 gentoo-dev-sources is done tocharian@gentoo.org 2005-01-17 16:34:23 0000 ~x86 hardened-sources-2.4.28-r3 patched solar@gentoo.org 2005-01-18 09:39:46 0000 CAN-2005-0001 fixed using attachment #48389 in >= grsec-sources-2.4.28.2.1.0-r1 koon@gentoo.org 2005-03-16 03:16:33 0000 Mass-Ccing kern-sec@gentoo.org to make sure Kernel Security guys know about all of these... plasmaroo@gentoo.org 2005-03-29 05:49:45 0000 All fixed, closing bug. rbu@gentoo.org 2009-05-03 14:07:39 0000 commit fa6e49a2497cb4298d81c0d384c1ade8bcf1f0a3 Author: Linus Torvalds <torvalds@ppc970.osdl.org> Handle two threads both trying to expand their stack simultaneously. commit 7d153fe70c171e9ea8dab7c0461d28651a44385f Author: Linus Torvalds <torvalds@ppc970.osdl.org> Clean up stack growth checks and move them into a common function. commit 092070386eaa3afc8e2375287bec98369736fc48 Author: Chris Wright <chrisw@osdl.org> [PATCH] acct_stack_growth nitpicks 48335 2005-01-12 12:17 0000 Patch against 2.6.10 (possibly others) pagefault-race-fix.patch text/plain IyBUaGlzIGlzIGEgQml0S2VlcGVyIGdlbmVyYXRlZCBkaWZmIC1OcnUgc3R5bGUgcGF0Y2guCiMK IyBDaGFuZ2VTZXQKIyAgIDIwMDUvMDEvMTIgMDg6MDk6MjAtMDg6MDAgdG9ydmFsZHNAcHBjOTcw Lm9zZGwub3JnIAojICAgSGFuZGxlIHR3byB0aHJlYWRzIGJvdGggdHJ5aW5nIHRvIGV4cGFuZCB0 aGVpciBzdGFjayBzaW11bHRhbmVvdXNseS4KIyAgIAojICAgV2UgaGFkIGFsbCB0aGUgbG9ja2lu 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