Hello,
syzkaller hit the following crash on
c92a9a461dff6140c539c61e457aa97df29517d6
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
audit: type=1400 audit(1515790631.378:9): avc: denied { sys_chroot } for
pid=3510 comm="syzkaller602893" capability=18
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
permissive=1
BUG: unable to handle kernel paging request at ffffed004e875e33
IP: bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
IP: memory_is_nonzero mm/kasan/kasan.c:184 [inline]
IP: memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
IP: memory_is_poisoned mm/kasan/kasan.c:241 [inline]
IP: check_memory_region_inline mm/kasan/kasan.c:257 [inline]
IP: check_memory_region+0x61/0x190 mm/kasan/kasan.c:267
PGD 21ffee067 P4D 21ffee067 PUD 21ffec067 PMD 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3510 Comm: syzkaller602893 Not tainted 4.15.0-rc7+ #259
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline]
RIP: 0010:check_memory_region+0x61/0x190 mm/kasan/kasan.c:267
RSP: 0018:ffff8801bfa77770 EFLAGS: 00010202
RAX: ffffed004e875e33 RBX: ffff8802743af19b RCX: ffffffff817deb1c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8802743af198
RBP: ffff8801bfa77780 R08: 1ffff1004e875e33 R09: ffffed004e875e33
R10: 0000000000000001 R11: ffffed004e875e33 R12: ffffed004e875e34
R13: ffff8802743af198 R14: ffff8801bfc9f000 R15: ffff8801c135a680
FS: 0000000001a1d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed004e875e33 CR3: 00000001bfe22003 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
memcpy+0x23/0x50 mm/kasan/kasan.c:302
memcpy include/linux/string.h:344 [inline]
map_lookup_elem+0x4dc/0xbd0 kernel/bpf/syscall.c:584
SYSC_bpf kernel/bpf/syscall.c:1711 [inline]
SyS_bpf+0x922/0x4400 kernel/bpf/syscall.c:1685
entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x440ac9
RSP: 002b:00000000007dff68 EFLAGS: 00000203 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440ac9
RDX: 0000000000000018 RSI: 0000000020eed000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004022a0
R13: 0000000000402330 R14: 0000000000000000 R15: 0000000000000000
Code: 89 f8 49 c1 e8 03 49 89 db 49 c1 eb 03 4d 01 cb 4d 01 c1 4d 8d 63 01
4c 89 c8 4d 89 e2 4d 29 ca 49 83 fa 10 7f 3d 4d 85 d2 74 33 <41> 80 39 00
75 21 48 b8 01 00 00 00 00 fc ff df 4d 01 d1 49 01
RIP: bytes_is_nonzero mm/kasan/kasan.c:166 [inline] RSP: ffff8801bfa77770
RIP: memory_is_nonzero mm/kasan/kasan.c:184 [inline] RSP: ffff8801bfa77770
RIP: memory_is_poisoned_n mm/kasan/kasan.c:210 [inline] RSP:
ffff8801bfa77770
RIP: memory_is_poisoned mm/kasan/kasan.c:241 [inline] RSP: ffff8801bfa77770
RIP: check_memory_region_inline mm/kasan/kasan.c:257 [inline] RSP:
ffff8801bfa77770
RIP: check_memory_region+0x61/0x190 mm/kasan/kasan.c:267 RSP:
ffff8801bfa77770
CR2: ffffed004e875e33
---[ end trace 769bd3705f3abe78 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to [email protected].
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
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If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
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Note: all commands must start from beginning of the line in the email body.
On Fri, Jan 12, 2018 at 11:58 PM, syzbot
<[email protected]> wrote:
> Hello,
>
> syzkaller hit the following crash on
> c92a9a461dff6140c539c61e457aa97df29517d6
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
Daniel, is it the same bug that was fixed by "bpf, array: fix overflow
in max_entries and undefined behavior in index_mask"?
> audit: type=1400 audit(1515790631.378:9): avc: denied { sys_chroot } for
> pid=3510 comm="syzkaller602893" capability=18
> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
> permissive=1
> BUG: unable to handle kernel paging request at ffffed004e875e33
> IP: bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
> IP: memory_is_nonzero mm/kasan/kasan.c:184 [inline]
> IP: memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
> IP: memory_is_poisoned mm/kasan/kasan.c:241 [inline]
> IP: check_memory_region_inline mm/kasan/kasan.c:257 [inline]
> IP: check_memory_region+0x61/0x190 mm/kasan/kasan.c:267
> PGD 21ffee067 P4D 21ffee067 PUD 21ffec067 PMD 0
> Oops: 0000 [#1] SMP KASAN
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Modules linked in:
> CPU: 0 PID: 3510 Comm: syzkaller602893 Not tainted 4.15.0-rc7+ #259
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
> RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline]
> RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
> RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline]
> RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline]
> RIP: 0010:check_memory_region+0x61/0x190 mm/kasan/kasan.c:267
> RSP: 0018:ffff8801bfa77770 EFLAGS: 00010202
> RAX: ffffed004e875e33 RBX: ffff8802743af19b RCX: ffffffff817deb1c
> RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8802743af198
> RBP: ffff8801bfa77780 R08: 1ffff1004e875e33 R09: ffffed004e875e33
> R10: 0000000000000001 R11: ffffed004e875e33 R12: ffffed004e875e34
> R13: ffff8802743af198 R14: ffff8801bfc9f000 R15: ffff8801c135a680
> FS: 0000000001a1d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffed004e875e33 CR3: 00000001bfe22003 CR4: 00000000001606f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> memcpy+0x23/0x50 mm/kasan/kasan.c:302
> memcpy include/linux/string.h:344 [inline]
> map_lookup_elem+0x4dc/0xbd0 kernel/bpf/syscall.c:584
> SYSC_bpf kernel/bpf/syscall.c:1711 [inline]
> SyS_bpf+0x922/0x4400 kernel/bpf/syscall.c:1685
> entry_SYSCALL_64_fastpath+0x23/0x9a
> RIP: 0033:0x440ac9
> RSP: 002b:00000000007dff68 EFLAGS: 00000203 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440ac9
> RDX: 0000000000000018 RSI: 0000000020eed000 RDI: 0000000000000001
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004022a0
> R13: 0000000000402330 R14: 0000000000000000 R15: 0000000000000000
> Code: 89 f8 49 c1 e8 03 49 89 db 49 c1 eb 03 4d 01 cb 4d 01 c1 4d 8d 63 01
> 4c 89 c8 4d 89 e2 4d 29 ca 49 83 fa 10 7f 3d 4d 85 d2 74 33 <41> 80 39 00 75
> 21 48 b8 01 00 00 00 00 fc ff df 4d 01 d1 49 01
> RIP: bytes_is_nonzero mm/kasan/kasan.c:166 [inline] RSP: ffff8801bfa77770
> RIP: memory_is_nonzero mm/kasan/kasan.c:184 [inline] RSP: ffff8801bfa77770
> RIP: memory_is_poisoned_n mm/kasan/kasan.c:210 [inline] RSP:
> ffff8801bfa77770
> RIP: memory_is_poisoned mm/kasan/kasan.c:241 [inline] RSP: ffff8801bfa77770
> RIP: check_memory_region_inline mm/kasan/kasan.c:257 [inline] RSP:
> ffff8801bfa77770
> RIP: check_memory_region+0x61/0x190 mm/kasan/kasan.c:267 RSP:
> ffff8801bfa77770
> CR2: ffffed004e875e33
> ---[ end trace 769bd3705f3abe78 ]---
> Kernel panic - not syncing: Fatal exception
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to [email protected].
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
> #syz test: git://repo/address.git branch
> and provide the patch inline or as an attachment.
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
>
> --
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On 01/13/2018 08:29 AM, Dmitry Vyukov wrote:
> On Fri, Jan 12, 2018 at 11:58 PM, syzbot
> <[email protected]> wrote:
>> Hello,
>>
>> syzkaller hit the following crash on
>> c92a9a461dff6140c539c61e457aa97df29517d6
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>> C reproducer is attached
>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> for information about syzkaller reproducers
>>
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: [email protected]
>> It will help syzbot understand when the bug is fixed. See footer for
>> details.
>> If you forward the report, please keep this part and the footer.
>
>
> Daniel, is it the same bug that was fixed by "bpf, array: fix overflow
> in max_entries and undefined behavior in index_mask"?
And also here, fixed by:
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=bbeb6e4323dad9b5e0ee9f60c223dd532e2403b1
>> audit: type=1400 audit(1515790631.378:9): avc: denied { sys_chroot } for
>> pid=3510 comm="syzkaller602893" capability=18
>> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
>> tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
>> permissive=1
>> BUG: unable to handle kernel paging request at ffffed004e875e33
>> IP: bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
>> IP: memory_is_nonzero mm/kasan/kasan.c:184 [inline]
>> IP: memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
>> IP: memory_is_poisoned mm/kasan/kasan.c:241 [inline]
>> IP: check_memory_region_inline mm/kasan/kasan.c:257 [inline]
>> IP: check_memory_region+0x61/0x190 mm/kasan/kasan.c:267
>> PGD 21ffee067 P4D 21ffee067 PUD 21ffec067 PMD 0
>> Oops: 0000 [#1] SMP KASAN
>> Dumping ftrace buffer:
>> (ftrace buffer empty)
>> Modules linked in:
>> CPU: 0 PID: 3510 Comm: syzkaller602893 Not tainted 4.15.0-rc7+ #259
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
>> RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline]
>> RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
>> RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline]
>> RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline]
>> RIP: 0010:check_memory_region+0x61/0x190 mm/kasan/kasan.c:267
>> RSP: 0018:ffff8801bfa77770 EFLAGS: 00010202
>> RAX: ffffed004e875e33 RBX: ffff8802743af19b RCX: ffffffff817deb1c
>> RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8802743af198
>> RBP: ffff8801bfa77780 R08: 1ffff1004e875e33 R09: ffffed004e875e33
>> R10: 0000000000000001 R11: ffffed004e875e33 R12: ffffed004e875e34
>> R13: ffff8802743af198 R14: ffff8801bfc9f000 R15: ffff8801c135a680
>> FS: 0000000001a1d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: ffffed004e875e33 CR3: 00000001bfe22003 CR4: 00000000001606f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> memcpy+0x23/0x50 mm/kasan/kasan.c:302
>> memcpy include/linux/string.h:344 [inline]
>> map_lookup_elem+0x4dc/0xbd0 kernel/bpf/syscall.c:584
>> SYSC_bpf kernel/bpf/syscall.c:1711 [inline]
>> SyS_bpf+0x922/0x4400 kernel/bpf/syscall.c:1685
>> entry_SYSCALL_64_fastpath+0x23/0x9a
>> RIP: 0033:0x440ac9
>> RSP: 002b:00000000007dff68 EFLAGS: 00000203 ORIG_RAX: 0000000000000141
>> RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440ac9
>> RDX: 0000000000000018 RSI: 0000000020eed000 RDI: 0000000000000001
>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004022a0
>> R13: 0000000000402330 R14: 0000000000000000 R15: 0000000000000000
>> Code: 89 f8 49 c1 e8 03 49 89 db 49 c1 eb 03 4d 01 cb 4d 01 c1 4d 8d 63 01
>> 4c 89 c8 4d 89 e2 4d 29 ca 49 83 fa 10 7f 3d 4d 85 d2 74 33 <41> 80 39 00 75
>> 21 48 b8 01 00 00 00 00 fc ff df 4d 01 d1 49 01
>> RIP: bytes_is_nonzero mm/kasan/kasan.c:166 [inline] RSP: ffff8801bfa77770
>> RIP: memory_is_nonzero mm/kasan/kasan.c:184 [inline] RSP: ffff8801bfa77770
>> RIP: memory_is_poisoned_n mm/kasan/kasan.c:210 [inline] RSP:
>> ffff8801bfa77770
>> RIP: memory_is_poisoned mm/kasan/kasan.c:241 [inline] RSP: ffff8801bfa77770
>> RIP: check_memory_region_inline mm/kasan/kasan.c:257 [inline] RSP:
>> ffff8801bfa77770
>> RIP: check_memory_region+0x61/0x190 mm/kasan/kasan.c:267 RSP:
>> ffff8801bfa77770
>> CR2: ffffed004e875e33
>> ---[ end trace 769bd3705f3abe78 ]---
>> Kernel panic - not syncing: Fatal exception
>> Dumping ftrace buffer:
>> (ftrace buffer empty)
>> Kernel Offset: disabled
>> Rebooting in 86400 seconds..
>>
>>
>> ---
>> This bug is generated by a dumb bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for details.
>> Direct all questions to [email protected].
>>
>> syzbot will keep track of this bug report.
>> If you forgot to add the Reported-by tag, once the fix for this bug is
>> merged
>> into any tree, please reply to this email with:
>> #syz fix: exact-commit-title
>> If you want to test a patch for this bug, please reply with:
>> #syz test: git://repo/address.git branch
>> and provide the patch inline or as an attachment.
>> To mark this as a duplicate of another syzbot report, please reply with:
>> #syz dup: exact-subject-of-another-report
>> If it's a one-off invalid bug report, please reply with:
>> #syz invalid
>> Note: if the crash happens again, it will cause creation of a new bug
>> report.
>> Note: all commands must start from beginning of the line in the email body.
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "syzkaller-bugs" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to [email protected].
>> To view this discussion on the web visit
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>> For more options, visit https://groups.google.com/d/optout.
On Sun, Jan 14, 2018 at 01:22:13AM +0100, Daniel Borkmann wrote:
> On 01/13/2018 08:29 AM, Dmitry Vyukov wrote:
> > On Fri, Jan 12, 2018 at 11:58 PM, syzbot
> > <[email protected]> wrote:
> >> Hello,
> >>
> >> syzkaller hit the following crash on
> >> c92a9a461dff6140c539c61e457aa97df29517d6
> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> >> compiler: gcc (GCC) 7.1.1 20170620
> >> .config is attached
> >> Raw console output is attached.
> >> C reproducer is attached
> >> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> >> for information about syzkaller reproducers
> >>
> >>
> >> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> >> Reported-by: [email protected]
> >> It will help syzbot understand when the bug is fixed. See footer for
> >> details.
> >> If you forward the report, please keep this part and the footer.
> >
> >
> > Daniel, is it the same bug that was fixed by "bpf, array: fix overflow
> > in max_entries and undefined behavior in index_mask"?
>
> And also here, fixed by:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=bbeb6e4323dad9b5e0ee9f60c223dd532e2403b1
>
Thanks Daniel, this crash is no longer occurring and I verified that commit
bbeb6e4323da fixed it, so let's allow syzbot to close this report too:
#syz fix: bpf, array: fix overflow in max_entries and undefined behavior in index_mask
- Eric