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Date: Wed, 1 Aug 2012 08:56:28 -0700 From: Peter Moody <pmoody@...gle.com> To: linux-kernel@...r.kernel.org Cc: Kees Cook <keescook@...gle.com>, mszeredi@...e.cz, viro@...iv.linux.org.uk, Eric Paris <eparis@...hat.com> Subject: Re: Oops in audit_copy_inode This time with a cleaner Oops: Pid: 2643, comm: cc1 Not tainted 3.5.0-rc6-at17+ #33 LENOVO 4291AK7/4291AK7 RIP: 0010:[<ffffffff810cec30>] [<ffffffff810cec30>] audit_copy_inode+0x10/0x90 RSP: 0018:ffff8801f88dfc58 EFLAGS: 00010282 RAX: ffff8801fb320000 RBX: ffff8801f887c508 RCX: 000000000000c7e8 RDX: 0000000000000000 RSI: ffff8801f3f1d970 RDI: ffff8801f887c508 RBP: ffff8801f88dfc88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8801f3f1d970 R13: ffff8801f887c4a8 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fd6b9473700(0000) GS:ffff880215200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000040 CR3: 000000020f6a3000 CR4: 00000000000407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process cc1 (pid: 2643, threadinfo ffff8801f88de000, task ffff8801fb320000) Stack: ffffffff8161c6fe ffff8801f887c508 ffff8801f3f1d970 ffff8801f887c4a8 ffff8801f887c508 ffff8801f3f1d970 ffff8801f88dfcf8 ffffffff810d237c ffffffff810d22bb 0000000000000000 ffff8801f3f1d970 ffff8801f4575e40 Call Trace: [<ffffffff8161c6fe>] ? mutex_unlock+0xe/0x10 [<ffffffff810d237c>] __audit_inode+0x13c/0x2a0 [<ffffffff810d22bb>] ? __audit_inode+0x7b/0x2a0 [<ffffffff8117b44c>] do_last+0x7ac/0xa90 [<ffffffff8117cad9>] path_openat+0xd9/0x410 [<ffffffff81087f2d>] ? sched_clock_cpu+0xbd/0x110 [<ffffffff8101a7a3>] ? native_sched_clock+0x13/0x80 [<ffffffff8101a819>] ? sched_clock+0x9/0x10 [<ffffffff8117cf32>] do_filp_open+0x42/0xa0 [<ffffffff8161ed9b>] ? _raw_spin_unlock+0x2b/0x40 [<ffffffff8118a2c2>] ? alloc_fd+0xd2/0x120 [<ffffffff8116c2f8>] do_sys_open+0xf8/0x1d0 [<ffffffff810d1a8c>] ? __audit_syscall_entry+0xcc/0x310 [<ffffffff8116c3f1>] sys_open+0x21/0x30 [<ffffffff81627529>] system_call_fastpath+0x16/0x1b Code: 00 00 c7 45 cc 1f 00 00 00 e9 2c ff ff ff 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 53 48 83 ec 20 66 66 66 66 90 <48> 8b 42 40 49 89 f4 48 8d 77 34 48 89 fb 48 89 47 18 48 8b 42 RIP [<ffffffff810cec30>] audit_copy_inode+0x10/0x90 RSP <ffff8801f88dfc58> CR2: 0000000000000040 ---[ end trace bcccee9a00e71a3b ]--- On Tue, Jul 31, 2012 at 4:02 PM, Peter Moody <pmoody@...gle.com> wrote: > I seem to have a reliable oops from 3.5.0-rc6 from Linus's tree. I've > bisected it down to, I think, the following commit: > > 7157486541bffc0dfec912e21ae639b029dae3d3 > > The Oops: > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.471368] Pid: 2643, comm: > cc1 Not tainted 3.5.0-rc6-at17+ #33 LENOVO 4291AK7/4291AK7 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.472342] RIP: > 0010:[<ffffffff810cec30>] [<ffffffff810cec30>] > audit_copy_inode+0x10/0x90 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.473300] RSP: > 0018:ffff8801f88dfc58 EFLAGS: 00010282 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.474253] RAX: > ffff8801fb320000 RBX: ffff8801f887c508 RCX: 000000000000c7e8 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.475210] RDX: > 0000000000000000 RSI: ffff8801f3f1d970 RDI: ffff8801f887c508 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.476172] RBP: > ffff8801f88dfc88 R08: 0000000000000000 R09: 0000000000000000 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.477138] R10: > 0000000000000001 R11: 0000000000000000 R12: ffff8801f3f1d970 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.478236] R13: > ffff8801f887c4a8 R14: 0000000000000000 R15: 0000000000000000 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.479218] FS: > 00007fd6b9473700(0000) GS:ffff880215200000(0000) > knlGS:0000000000000000 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.480182] CS: 0010 DS: 0000 > ES: 0000 CR0: 0000000080050033 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.481143] CR2: > 0000000000000040 CR3: 000000020f6a3000 CR4: 00000000000407e0 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.482142] DR0: > 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.483121] DR3: > 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.484094] Process cc1 (pid: > 2643, threadinfo ffff8801f88de000, task ffff8801fb320000) > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.485070] Stack: > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.486030] ffffffff8161c6fe > ffff8801f887c508 ffff8801f3f1d970 ffff8801f887c4a8 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.487011] ffff8801f887c508 > ffff8801f3f1d970 ffff8801f88dfcf8 ffffffff810d237c > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.487995] ffffffff810d22bb > 0000000000000000 ffff8801f3f1d970 ffff8801f4575e40 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.488981] Call Trace: > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.489957] > [<ffffffff8161c6fe>] ? mutex_unlock+0xe/0x10 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.490934] > [<ffffffff810d237c>] __audit_inode+0x13c/0x2a0 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.491927] > [<ffffffff810d22bb>] ? __audit_inode+0x7b/0x2a0 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.492916] > [<ffffffff8117b44c>] do_last+0x7ac/0xa90 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.493883] > [<ffffffff8117cad9>] path_openat+0xd9/0x410 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.494852] > [<ffffffff81087f2d>] ? sched_clock_cpu+0xbd/0x110 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.495817] > [<ffffffff8101a7a3>] ? native_sched_clock+0x13/0x80 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.496774] > [<ffffffff8101a819>] ? sched_clock+0x9/0x10 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.497721] > [<ffffffff8117cf32>] do_filp_open+0x42/0xa0 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.498663] > [<ffffffff8161ed9b>] ? _raw_spin_unlock+0x2b/0x40 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.499609] > [<ffffffff8118a2c2>] ? alloc_fd+0xd2/0x120 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.500579] > [<ffffffff8116c2f8>] do_sys_open+0xf8/0x1d0 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.501514] > [<ffffffff810d1a8c>] ? __audit_syscall_entry+0xcc/0x310 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.502471] > [<ffffffff8116c3f1>] sys_open+0x21/0x30 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.503384] > [<ffffffff81627529>] system_call_fastpath+0x16/0x1b > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.504275] Code: 00 00 c7 45 > cc 1f 00 00 00 e9 2c ff ff ff 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 > 55 48 89 e5 41 54 53 48 83 ec 20 66 66 66 66 90 <48> 8b 42 40 49 89 f4 > 48 8d 77 34 48 89 fb 48 89 47 18 48 8b 42 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.506188] RIP > [<ffffffff810cec30>] audit_copy_inode+0x10/0x90 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.507108] RSP <ffff8801f88dfc58> > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.508021] CR2: 0000000000000040 > Jul 31 15:32:11 pmoody-x220 kernel: [ 108.516307] ---[ end trace > bcccee9a00e71a3b ]--- > > I can generate this oops by doing the following: > > sudo /etc/init.d/auditd start ; sudo auditctl -D ; sudo auditctl -a > exit,always -F arch=b64 -S chmod -k oops ; gcc hello.c > > The macro expansion in hello.c seems to be important. > > Other bits of likely pertinent information: Running Ubuntu. > auditd/auditctl version 1.7.13-1ubuntu2 (ancient..), gcc version > 4.4.3. > > Please let me know if there's anything else I can provide (but please > cc me, I'm not subscribed to lkml). > > Cheers, > peter > > -- > Peter Moody Google > Security Engineer pgp:0xC3410038 -- Peter Moody Google 1.650.253.7306 Security Engineer pgp:0xC3410038 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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