* general protection fault in tss_update_io_bitmap
@ 2019-11-21 1:55 syzbot
2019-11-21 11:01 ` Borislav Petkov
0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2019-11-21 1:55 UTC (permalink / raw)
To: adobriyan, ak, bigeasy, bp, fenghua.yu, frederic, hpa, keescook,
kernelfans, len.brown, linux-kernel, longman, luto, mingo,
peterz, rafael.j.wysocki, riel, syzkaller-bugs, tglx, tim.c.chen,
tonywwang-oc, wang.yi59, x86
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 <tglx@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+81e6ff9d4cdb05fd4f5e@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 syzkaller@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
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: general protection fault in tss_update_io_bitmap
2019-11-21 1:55 general protection fault in tss_update_io_bitmap syzbot
@ 2019-11-21 11:01 ` Borislav Petkov
2019-11-21 17:36 ` Kees Cook
0 siblings, 1 reply; 5+ messages in thread
From: Borislav Petkov @ 2019-11-21 11:01 UTC (permalink / raw)
To: syzbot
Cc: adobriyan, ak, bigeasy, fenghua.yu, frederic, hpa, keescook,
kernelfans, len.brown, linux-kernel, longman, luto, mingo,
peterz, rafael.j.wysocki, riel, syzkaller-bugs, tglx, tim.c.chen,
tonywwang-oc, wang.yi59, x86
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 <tglx@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
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: general protection fault in tss_update_io_bitmap
2019-11-21 11:01 ` Borislav Petkov
@ 2019-11-21 17:36 ` Kees Cook
2019-11-21 20:19 ` syzbot
2019-11-22 9:30 ` Borislav Petkov
0 siblings, 2 replies; 5+ messages in thread
From: Kees Cook @ 2019-11-21 17:36 UTC (permalink / raw)
To: syzbot
Cc: Borislav Petkov, adobriyan, ak, bigeasy, fenghua.yu, frederic,
hpa, kernelfans, len.brown, linux-kernel, longman, luto, mingo,
peterz, rafael.j.wysocki, riel, syzkaller-bugs, tglx, tim.c.chen,
tonywwang-oc, wang.yi59, x86
On Thu, Nov 21, 2019 at 12:01:15PM +0100, Borislav Petkov wrote:
> 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 <tglx@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
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
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: general protection fault in tss_update_io_bitmap
2019-11-21 17:36 ` Kees Cook
@ 2019-11-21 20:19 ` syzbot
2019-11-22 9:30 ` Borislav Petkov
1 sibling, 0 replies; 5+ messages in thread
From: syzbot @ 2019-11-21 20:19 UTC (permalink / raw)
To: adobriyan, ak, bigeasy, bp, fenghua.yu, frederic, hpa, keescook,
kernelfans, len.brown, linux-kernel, longman, luto, mingo,
peterz, rafael.j.wysocki, riel, syzkaller-bugs, tglx, tim.c.chen,
tonywwang-oc, wang.yi59, x86
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger
crash:
Reported-and-tested-by:
syzbot+81e6ff9d4cdb05fd4f5e@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.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: general protection fault in tss_update_io_bitmap
2019-11-21 17:36 ` Kees Cook
2019-11-21 20:19 ` syzbot
@ 2019-11-22 9:30 ` Borislav Petkov
1 sibling, 0 replies; 5+ messages in thread
From: Borislav Petkov @ 2019-11-22 9:30 UTC (permalink / raw)
To: Kees Cook
Cc: syzbot, adobriyan, ak, bigeasy, fenghua.yu, frederic, hpa,
kernelfans, len.brown, linux-kernel, longman, luto, mingo,
peterz, rafael.j.wysocki, riel, syzkaller-bugs, tglx, tim.c.chen,
tonywwang-oc, wang.yi59, x86
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.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
^ permalink raw reply [flat|nested] 5+ messages in thread
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2019-11-21 1:55 general protection fault in tss_update_io_bitmap syzbot
2019-11-21 11:01 ` Borislav Petkov
2019-11-21 17:36 ` Kees Cook
2019-11-21 20:19 ` syzbot
2019-11-22 9:30 ` Borislav Petkov
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