general protection fault in tss_update_io_bitmap

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syzbot

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Nov 20, 2019, 8:55:10 PM11/20/19
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Hello,

syzbot found the following crash on:

HEAD commit: 5d1131b4 Add linux-next specific files for 20191119
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=177979d2e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b60c562d89e5a8df
dashboard link: https://syzkaller.appspot.com/bug?extid=81e6ff9d4cdb05fd4f5e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1549ed8ce00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17f91012e00000

The bug was bisected to:

commit 111e7b15cf10f6e973ccf537c70c66a5de539060
Author: Thomas Gleixner <tg...@linutronix.de>
Date: Tue Nov 12 20:40:33 2019 +0000

x86/ioperm: Extend IOPL config to control ioperm() as well

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10490e86e00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=12490e86e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=14490e86e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+81e6ff...@syzkaller.appspotmail.com
Fixes: 111e7b15cf10 ("x86/ioperm: Extend IOPL config to control ioperm() as
well")

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8968 Comm: syz-executor566 Not tainted
5.4.0-rc8-next-20191119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:tss_update_io_bitmap+0x138/0x590 arch/x86/kernel/process.c:395
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9e 03 00 00 4c 89
ea 4c 8b 73 68 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f
85 72 03 00 00 4d 3b 75 00 0f 85 35 02 00 00 48 8d
RSP: 0018:ffff8880a4effe80 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ae80a000 RCX: ffffffff812a3228
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880ae80a068
RBP: ffff8880a4efff10 R08: 1ffff110126f5020 R09: ffffed10126f5021
R10: ffffed10126f5020 R11: ffff8880937a8107 R12: 1ffff110149dffd2
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000001e8f880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffff01c2038 CR3: 0000000099c07000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
prepare_exit_to_usermode arch/x86/entry/common.c:201 [inline]
syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
do_syscall_64+0x685/0x790 arch/x86/entry/common.c:304
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4400f9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffff000a2d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ac
RAX: 0000000000000000 RBX: 00000000004002c8 RCX: 00000000004400f9
RDX: 0000000000400a20 RSI: 0000000000000012 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401980
R13: 0000000000401a10 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 6bbd68071a8b58ba ]---
RIP: 0010:tss_update_io_bitmap+0x138/0x590 arch/x86/kernel/process.c:395
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9e 03 00 00 4c 89
ea 4c 8b 73 68 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f
85 72 03 00 00 4d 3b 75 00 0f 85 35 02 00 00 48 8d
RSP: 0018:ffff8880a4effe80 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ae80a000 RCX: ffffffff812a3228
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880ae80a068
RBP: ffff8880a4efff10 R08: 1ffff110126f5020 R09: ffffed10126f5021
R10: ffffed10126f5020 R11: ffff8880937a8107 R12: 1ffff110149dffd2
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000001e8f880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffff01c2038 CR3: 0000000099c07000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

Borislav Petkov

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Nov 21, 2019, 6:01:20 AM11/21/19
to syzbot, adob...@gmail.com, a...@linux.intel.com, big...@linutronix.de, fengh...@intel.com, fred...@kernel.org, h...@zytor.com, kees...@chromium.org, kerne...@gmail.com, len....@intel.com, linux-...@vger.kernel.org, lon...@redhat.com, lu...@kernel.org, mi...@redhat.com, pet...@infradead.org, rafael.j...@intel.com, ri...@surriel.com, syzkall...@googlegroups.com, tg...@linutronix.de, tim.c...@linux.intel.com, tonyww...@zhaoxin.com, wang...@zte.com.cn, x...@kernel.org
On Wed, Nov 20, 2019 at 05:55:09PM -0800, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 5d1131b4 Add linux-next specific files for 20191119
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=177979d2e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b60c562d89e5a8df
> dashboard link: https://syzkaller.appspot.com/bug?extid=81e6ff9d4cdb05fd4f5e
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1549ed8ce00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17f91012e00000
>
> The bug was bisected to:
>
> commit 111e7b15cf10f6e973ccf537c70c66a5de539060
> Author: Thomas Gleixner <tg...@linutronix.de>
> Date: Tue Nov 12 20:40:33 2019 +0000
>
> x86/ioperm: Extend IOPL config to control ioperm() as well
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10490e86e00000
> final crash: https://syzkaller.appspot.com/x/report.txt?x=12490e86e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14490e86e00000

Try this:

https://git.kernel.org/tip/e3cb0c7102f04c83bf1a7cb1d052e92749310b46

Thx.

--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Kees Cook

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Nov 21, 2019, 12:36:17 PM11/21/19
to syzbot, Borislav Petkov, adob...@gmail.com, a...@linux.intel.com, big...@linutronix.de, fengh...@intel.com, fred...@kernel.org, h...@zytor.com, kerne...@gmail.com, len....@intel.com, linux-...@vger.kernel.org, lon...@redhat.com, lu...@kernel.org, mi...@redhat.com, pet...@infradead.org, rafael.j...@intel.com, ri...@surriel.com, syzkall...@googlegroups.com, tg...@linutronix.de, tim.c...@linux.intel.com, tonyww...@zhaoxin.com, wang...@zte.com.cn, x...@kernel.org
Rewording so syzbot can see it (https://goo.gl/tpsmEJ#testing-patches) ...

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git e3cb0c7102f04c83bf1a7cb1d052e92749310b46

--
Kees Cook

syzbot

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Nov 21, 2019, 3:19:02 PM11/21/19
to adob...@gmail.com, a...@linux.intel.com, big...@linutronix.de, b...@alien8.de, fengh...@intel.com, fred...@kernel.org, h...@zytor.com, kees...@chromium.org, kerne...@gmail.com, len....@intel.com, linux-...@vger.kernel.org, lon...@redhat.com, lu...@kernel.org, mi...@redhat.com, pet...@infradead.org, rafael.j...@intel.com, ri...@surriel.com, syzkall...@googlegroups.com, tg...@linutronix.de, tim.c...@linux.intel.com, tonyww...@zhaoxin.com, wang...@zte.com.cn, x...@kernel.org
Hello,

syzbot has tested the proposed patch and the reproducer did not trigger
crash:

Reported-and-tested-by:
syzbot+81e6ff...@syzkaller.appspotmail.com

Tested on:

commit: e3cb0c71 x86/ioperm: Fix use of deprecated config option
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
kernel config: https://syzkaller.appspot.com/x/.config?x=1fc51b2845bfe6fc
dashboard link: https://syzkaller.appspot.com/bug?extid=81e6ff9d4cdb05fd4f5e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Note: testing is done by a robot and is best-effort only.

Borislav Petkov

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Nov 22, 2019, 4:30:57 AM11/22/19
to Kees Cook, syzbot, adob...@gmail.com, a...@linux.intel.com, big...@linutronix.de, fengh...@intel.com, fred...@kernel.org, h...@zytor.com, kerne...@gmail.com, len....@intel.com, linux-...@vger.kernel.org, lon...@redhat.com, lu...@kernel.org, mi...@redhat.com, pet...@infradead.org, rafael.j...@intel.com, ri...@surriel.com, syzkall...@googlegroups.com, tg...@linutronix.de, tim.c...@linux.intel.com, tonyww...@zhaoxin.com, wang...@zte.com.cn, x...@kernel.org
On Thu, Nov 21, 2019 at 09:36:14AM -0800, Kees Cook wrote:
> Rewording so syzbot can see it (https://goo.gl/tpsmEJ#testing-patches) ...

Thanks, /me bookmarks.

Eric Biggers

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Nov 27, 2019, 12:50:58 AM11/27/19
to syzbot, syzkall...@googlegroups.com
#syz fix: x86/ioperm: Fix use of deprecated config option
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