linux-kernel - Re: [tip:x86/mm] x86, mm: Set first MB as RW+NX

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Message-ID: <20100612130032.GA11516@elte.hu>
Date:	Sat, 12 Jun 2010 15:00:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Siarhei Liakh <sliakh.lkml@...il.com>
Cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
	hpa@...ux.intel.com, jiang@...ncsu.edu
Subject: Re: [tip:x86/mm] x86, mm: Set first MB as RW+NX


FYI, the NX commits in tip:x86/mm have triggered a new boot crash in -tip 
testing (x86, 32-bit):

[    1.176004] calling  pci_arch_init+0x0/0x54 @ 1
[    1.185812] kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
[    1.188000] BUG: unable to handle kernel paging request at c00fbfcb
[    1.188000] IP: [<c00fbfcb>] 0xc00fbfcb
[    1.188000] *pdpt = 0000000001d99001 *pde = 000000000240a067 *pte = 80000000000fb163 
[    1.188000] Oops: 0011 [#1] SMP 
[    1.188000] last sysfs file: 
[    1.188000] Modules linked in:
[    1.188000] 
[    1.188000] Pid: 1, comm: swapper Not tainted 2.6.35-rc3-tip-00975-gb7201cb-dirty #8395 A8N-E/System Product Name
[    1.188000] EIP: 0060:[<c00fbfcb>] EFLAGS: 00010046 CPU: 1
[    1.188000] EIP is at 0xc00fbfcb
[    1.188000] EAX: 0000b101 EBX: 000f0000 ECX: f6838000 EDX: 00000001
[    1.188000] ESI: 000f21d0 EDI: c1ceddd4 EBP: f6821fa8 ESP: f6821f7a
[    1.188000]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[    1.188000] Process swapper (pid: 1, ti=f6821000 task=f6838000 task.ti=f6821000)
[    1.188000] Stack:
[    1.188000]  c00f2411 c00f21e1 c2210006 0060c1d4 3fab0000 0202c10a b1010000 335f0000
[    1.188000] <0> 00015f32 00000000 00020000 1fb40000 c055f682 5ffcc1d4 1fd04655 103af682
[    1.188000] <0> c036c100 0000c1d4 f6940000 0002c1d6 00020000 1fe40000 73a1f682 0000c1d1
[    1.188000] Call Trace:
[    1.188000] Code: ef 66 58 66 5a c3 e8 42 ff cb 00 00 00 00 00 00 66 51 0a ff 75 11 c0 ed 03 80 fd 1f 77 05 80 fd 00 73 04 66 59 f9 c3 66 59 f8 c3 <b1> 05 90 90 c3 b3 28 b7 08 c3 00 00 00 00 00 00 00 00 00 00 00 
[    1.188000] EIP: [<c00fbfcb>] 0xc00fbfcb SS:ESP 0068:f6821f7a
[    1.188000] CR2: 00000000c00fbfcb
[    1.188000] ---[ end trace 5a5d197966b56a2e ]---

Config and full bootlog attached. I've excluded them from tip:master for now.

Thanks,

	Ingo

View attachment "config" of type "text/plain" (78289 bytes)

View attachment "crash.log" of type "text/plain" (31166 bytes)