KASAN: use-after-free Write in _free_event
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syzbot
Jul 9, 2018, 1:52:03 AM7/9/18
to ac...@kernel.org, alexander...@linux.intel.com, jo...@redhat.com, linux-...@vger.kernel.org, mi...@redhat.com, namh...@kernel.org, pet...@infradead.org, syzkall...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: b2d44d145d2a Merge tag '4.18-rc3-smb3fixes' of git://git.s..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=178cf50c400000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86
dashboard link: https://syzkaller.appspot.com/bug?extid=a24c397a29ad22d86c98
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a24c39...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in atomic_dec_and_test
include/asm-generic/atomic-instrumented.h:222 [inline]
BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95
[inline]
BUG: KASAN: use-after-free in _free_event+0x48d/0x1440
kernel/events/core.c:4451
Write of size 4 at addr ffff8801999ee2a0 by task syz-executor2/19286
CPU: 1 PID: 19286 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #136
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
check_memory_region_inline mm/kasan/kasan.c:260 [inline]
check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
atomic_dec_and_test include/asm-generic/atomic-instrumented.h:222 [inline]
put_task_struct include/linux/sched/task.h:95 [inline]
_free_event+0x48d/0x1440 kernel/events/core.c:4451
free_event+0xb4/0x180 kernel/events/core.c:4472
perf_event_release_kernel+0x7d5/0x1050 kernel/events/core.c:4633
perf_release+0x37/0x50 kernel/events/core.c:4647
__fput+0x355/0x8b0 fs/file_table.c:209
____fput+0x15/0x20 fs/file_table.c:243
task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x1b08/0x2750 kernel/exit.c:865
do_group_exit+0x177/0x440 kernel/exit.c:968
get_signal+0x88e/0x1970 kernel/signal.c:2468
do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2e0/0x370 arch/x86/entry/common.c:162
prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197
retint_user+0x8/0x18
RIP: 0033: (null)
Code: Bad RIP value.
RSP: 002b:0000000020000048 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f62934726d4 RCX: 0000000000455e29
RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000020000080 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bbc2c R14: 00000000004c8f48 R15: 0000000000000000
Allocated by task 19280:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644
alloc_task_struct_node kernel/fork.c:157 [inline]
dup_task_struct kernel/fork.c:779 [inline]
copy_process.part.39+0x16b5/0x7220 kernel/fork.c:1641
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 19280:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
free_task_struct kernel/fork.c:162 [inline]
free_task+0x16e/0x1f0 kernel/fork.c:390
copy_process.part.39+0x15c9/0x7220 kernel/fork.c:2034
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8801999ee280
which belongs to the cache task_struct(81:syz2) of size 5952
The buggy address is located 32 bytes inside of
5952-byte region [ffff8801999ee280, ffff8801999ef9c0)
The buggy address belongs to the page:
page:ffffea0006667b80 count:1 mapcount:0 mapping:ffff8801b0bb6300 index:0x0
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00071a0888 ffff8801ab65ce48 ffff8801b0bb6300
raw: 0000000000000000 ffff8801999ee280 0000000100000001 ffff8801acaa4000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801acaa4000
Memory state around the buggy address:
ffff8801999ee180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801999ee200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801999ee280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8801999ee300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801999ee380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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#bug-status-tracking for how to communicate with
syzbot.
syzbot found the following crash on:
HEAD commit: b2d44d145d2a Merge tag '4.18-rc3-smb3fixes' of git://git.s..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=178cf50c400000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86
dashboard link: https://syzkaller.appspot.com/bug?extid=a24c397a29ad22d86c98
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a24c39...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in atomic_dec_and_test
include/asm-generic/atomic-instrumented.h:222 [inline]
BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95
[inline]
BUG: KASAN: use-after-free in _free_event+0x48d/0x1440
kernel/events/core.c:4451
Write of size 4 at addr ffff8801999ee2a0 by task syz-executor2/19286
CPU: 1 PID: 19286 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #136
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
check_memory_region_inline mm/kasan/kasan.c:260 [inline]
check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
atomic_dec_and_test include/asm-generic/atomic-instrumented.h:222 [inline]
put_task_struct include/linux/sched/task.h:95 [inline]
_free_event+0x48d/0x1440 kernel/events/core.c:4451
free_event+0xb4/0x180 kernel/events/core.c:4472
perf_event_release_kernel+0x7d5/0x1050 kernel/events/core.c:4633
perf_release+0x37/0x50 kernel/events/core.c:4647
__fput+0x355/0x8b0 fs/file_table.c:209
____fput+0x15/0x20 fs/file_table.c:243
task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x1b08/0x2750 kernel/exit.c:865
do_group_exit+0x177/0x440 kernel/exit.c:968
get_signal+0x88e/0x1970 kernel/signal.c:2468
do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2e0/0x370 arch/x86/entry/common.c:162
prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197
retint_user+0x8/0x18
RIP: 0033: (null)
Code: Bad RIP value.
RSP: 002b:0000000020000048 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f62934726d4 RCX: 0000000000455e29
RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000020000080 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bbc2c R14: 00000000004c8f48 R15: 0000000000000000
Allocated by task 19280:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644
alloc_task_struct_node kernel/fork.c:157 [inline]
dup_task_struct kernel/fork.c:779 [inline]
copy_process.part.39+0x16b5/0x7220 kernel/fork.c:1641
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 19280:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
free_task_struct kernel/fork.c:162 [inline]
free_task+0x16e/0x1f0 kernel/fork.c:390
copy_process.part.39+0x15c9/0x7220 kernel/fork.c:2034
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8801999ee280
which belongs to the cache task_struct(81:syz2) of size 5952
The buggy address is located 32 bytes inside of
5952-byte region [ffff8801999ee280, ffff8801999ef9c0)
The buggy address belongs to the page:
page:ffffea0006667b80 count:1 mapcount:0 mapping:ffff8801b0bb6300 index:0x0
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00071a0888 ffff8801ab65ce48 ffff8801b0bb6300
raw: 0000000000000000 ffff8801999ee280 0000000100000001 ffff8801acaa4000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801acaa4000
Memory state around the buggy address:
ffff8801999ee180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801999ee200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801999ee280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8801999ee300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801999ee380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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#bug-status-tracking for how to communicate with
syzbot.
Alexander Shishkin
Jul 9, 2018, 6:11:15 AM7/9/18
to syzbot, ac...@kernel.org, jo...@redhat.com, linux-...@vger.kernel.org, mi...@redhat.com, namh...@kernel.org, pet...@infradead.org, syzkall...@googlegroups.com
syzbot <syzbot+a24c39...@syzkaller.appspotmail.com> writes:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: b2d44d145d2a Merge tag '4.18-rc3-smb3fixes' of git://git.s..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=178cf50c400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86
> dashboard link: https://syzkaller.appspot.com/bug?extid=a24c397a29ad22d86c98
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
Is there a chance of getting a reproducer for this one?
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: b2d44d145d2a Merge tag '4.18-rc3-smb3fixes' of git://git.s..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=178cf50c400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86
> dashboard link: https://syzkaller.appspot.com/bug?extid=a24c397a29ad22d86c98
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
Thanks,
--
Alex
Dmitry Vyukov
Jul 9, 2018, 7:02:43 AM7/9/18
to Alexander Shishkin, syzbot, Arnaldo Carvalho de Melo, jo...@redhat.com, LKML, Ingo Molnar, Namhyung Kim, Peter Zijlstra, syzkaller-bugs
time. What's the chance in this case I don't know. Since it happened
only once so far, probably not too high.
But there seems to be a good hint in the KASAN report: task was freed
right inside of fork/copy_process, probably some error happened, but
it seems to have been registered in some global list already and
perf_release discovered it there. Does it make sense? Was it
registered? What should have been prevented the task alive at the time
of access?
syzbot
Jul 9, 2018, 10:16:02 PM7/9/18
to ac...@kernel.org, alexander...@linux.intel.com, dvy...@google.com, jo...@redhat.com, linux-...@vger.kernel.org, mi...@redhat.com, namh...@kernel.org, pet...@infradead.org, syzkall...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 092150a25cb7 Merge branch 'for-linus' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16627cc2400000
kernel config: https://syzkaller.appspot.com/x/.config?x=25856fac4e580aa7
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16dd4968400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a24c39...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in atomic_dec_and_test
include/asm-generic/atomic-instrumented.h:222 [inline]
BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95
[inline]
BUG: KASAN: use-after-free in _free_event+0x48d/0x1440
kernel/events/core.c:4451
Write of size 4 at addr ffff8801ab6360e0 by task syz-executor205/5237
CPU: 1 PID: 5237 Comm: syz-executor205 Not tainted 4.18.0-rc4+ #139
RAX: 0000000000000000 RBX: 00000000006dbc24 RCX: 0000000000445d89
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000006dbc20
R13: 0030656c69662f2e R14: 0000004000008912 R15: 0000000000000006
Allocated by task 5236:
which belongs to the cache task_struct of size 5952
raw: 0000000000000000 ffff8801ab6360c0 0000000100000001 0000000000000000
ffff8801ab636000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801ab636080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff8801ab636100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801ab636180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
HEAD commit: 092150a25cb7 Merge branch 'for-linus' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16627cc2400000
kernel config: https://syzkaller.appspot.com/x/.config?x=25856fac4e580aa7
dashboard link: https://syzkaller.appspot.com/bug?extid=a24c397a29ad22d86c98
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=14d45afc400000
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16dd4968400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a24c39...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in atomic_dec_and_test
include/asm-generic/atomic-instrumented.h:222 [inline]
BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95
[inline]
BUG: KASAN: use-after-free in _free_event+0x48d/0x1440
kernel/events/core.c:4451
CPU: 1 PID: 5237 Comm: syz-executor205 Not tainted 4.18.0-rc4+ #139
RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000020000080 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000006dbc20
R13: 0030656c69662f2e R14: 0000004000008912 R15: 0000000000000006
Allocated by task 5236:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644
alloc_task_struct_node kernel/fork.c:157 [inline]
dup_task_struct kernel/fork.c:779 [inline]
copy_process.part.39+0x16b5/0x7220 kernel/fork.c:1641
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 5236:
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644
alloc_task_struct_node kernel/fork.c:157 [inline]
dup_task_struct kernel/fork.c:779 [inline]
copy_process.part.39+0x16b5/0x7220 kernel/fork.c:1641
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
free_task_struct kernel/fork.c:162 [inline]
free_task+0x16e/0x1f0 kernel/fork.c:390
copy_process.part.39+0x15c9/0x7220 kernel/fork.c:2034
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8801ab6360c0
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
free_task_struct kernel/fork.c:162 [inline]
free_task+0x16e/0x1f0 kernel/fork.c:390
copy_process.part.39+0x15c9/0x7220 kernel/fork.c:2034
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
which belongs to the cache task_struct of size 5952
The buggy address is located 32 bytes inside of
5952-byte region [ffff8801ab6360c0, ffff8801ab637800)
The buggy address belongs to the page:
page:ffffea0006ad8d80 count:1 mapcount:0 mapping:ffff8801da94b200 index:0x0
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea0006ad9008 ffffea00075f5888 ffff8801da94b200
flags: 0x2fffc0000008100(slab|head)
raw: 0000000000000000 ffff8801ab6360c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801ab635f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801ab636000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801ab636080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff8801ab636100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801ab636180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Xie XiuQi
Feb 16, 2019, 5:43:55 AM2/16/19
to Alexander Shishkin, syzbot, ac...@kernel.org, jo...@redhat.com, linux-...@vger.kernel.org, mi...@redhat.com, namh...@kernel.org, pet...@infradead.org, syzkall...@googlegroups.com, Cheng Jian, Li Bin, wangxuefeng, Xie XiuQi
Hi everyone,
I meet this bug two times, does anyone has idea to fix this issue ? (See attachments)
==================================================================
BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline]
Write of size 4 at addr ffff8883780cd0a0 by task syz-executor0/9553
CPU: 3 PID: 9553 Comm: syz-executor0 Not tainted 4.19.18-514.55.6.9.x86_64+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
print_address_description+0x79/0x330 mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report+0x18a/0x2e0 mm/kasan/report.c:412
atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline]
put_task_struct include/linux/sched/task.h:95 [inline]
_free_event+0x2c4/0xfe0 kernel/events/core.c:4452
free_event+0x41/0xa0 kernel/events/core.c:4473
perf_event_release_kernel+0x43b/0xc70 kernel/events/core.c:4634
perf_release+0x33/0x40 kernel/events/core.c:4648
__fput+0x27f/0x7f0 fs/file_table.c:278
task_work_run+0x136/0x1b0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x850/0x2b90 kernel/exit.c:867
do_group_exit+0x106/0x2f0 kernel/exit.c:970
get_signal+0x62b/0x1740 kernel/signal.c:2513
do_signal+0x94/0x16a0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x108/0x1d0 arch/x86/entry/common.c:162
prepare_exit_to_usermode+0x27b/0x2f0 arch/x86/entry/common.c:197
retint_user+0x8/0x18
RIP: 0033:0x4021b7
Code: Bad RIP value.
RSP: 002b:00007fa7cb40cb30 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000462589
RDX: 00007fa7cb40cb40 RSI: ffffffffffffffb8 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000004bc4cd R14: 00000000006f4c70 R15: 00000000ffffffff
Allocated by task 9552:
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xa0/0xd0 mm/kasan/kasan.c:553
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc_node mm/slub.c:2706 [inline]
kmem_cache_alloc_node+0xe3/0x2e0 mm/slub.c:2742
alloc_task_struct_node kernel/fork.c:157 [inline]
dup_task_struct kernel/fork.c:802 [inline]
copy_process.part.26+0x1a98/0x6c70 kernel/fork.c:1707
copy_process kernel/fork.c:1664 [inline]
_do_fork+0x1c6/0xe60 kernel/fork.c:2175
do_syscall_64+0xc8/0x580 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 9552:
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x12e/0x180 mm/kasan/kasan.c:521
slab_free_hook mm/slub.c:1371 [inline]
slab_free_freelist_hook mm/slub.c:1398 [inline]
slab_free mm/slub.c:2953 [inline]
kmem_cache_free+0xbd/0x320 mm/slub.c:2969
copy_process.part.26+0x18d9/0x6c70 kernel/fork.c:2107
copy_process kernel/fork.c:1664 [inline]
_do_fork+0x1c6/0xe60 kernel/fork.c:2175
do_syscall_64+0xc8/0x580 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8883780cd080
which belongs to the cache task_struct of size 9992
flags: 0x2fffff80008100(slab|head)
raw: 002fffff80008100 dead000000000100 dead000000000200 ffff888107d07a00
raw: 0000000000000000 0000000080030003 00000001ffffffff 0000000000000000
ffff8883780cd000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8883780cd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8883780cd100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8883780cd180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
> .
>
--
Thanks,
Xie XiuQi
I meet this bug two times, does anyone has idea to fix this issue ? (See attachments)
==================================================================
BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline]
BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95 [inline]
BUG: KASAN: use-after-free in _free_event+0x2c4/0xfe0 kernel/events/core.c:4452
Write of size 4 at addr ffff8883780cd0a0 by task syz-executor0/9553
CPU: 3 PID: 9553 Comm: syz-executor0 Not tainted 4.19.18-514.55.6.9.x86_64+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
__dump_stack lib/dump_stack.c:77 [inline]
print_address_description+0x79/0x330 mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report+0x18a/0x2e0 mm/kasan/report.c:412
atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline]
put_task_struct include/linux/sched/task.h:95 [inline]
_free_event+0x2c4/0xfe0 kernel/events/core.c:4452
free_event+0x41/0xa0 kernel/events/core.c:4473
perf_event_release_kernel+0x43b/0xc70 kernel/events/core.c:4634
perf_release+0x33/0x40 kernel/events/core.c:4648
__fput+0x27f/0x7f0 fs/file_table.c:278
task_work_run+0x136/0x1b0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x850/0x2b90 kernel/exit.c:867
do_group_exit+0x106/0x2f0 kernel/exit.c:970
get_signal+0x62b/0x1740 kernel/signal.c:2513
do_signal+0x94/0x16a0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x108/0x1d0 arch/x86/entry/common.c:162
prepare_exit_to_usermode+0x27b/0x2f0 arch/x86/entry/common.c:197
retint_user+0x8/0x18
RIP: 0033:0x4021b7
Code: Bad RIP value.
RSP: 002b:00007fa7cb40cb30 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000462589
RDX: 00007fa7cb40cb40 RSI: ffffffffffffffb8 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000004bc4cd R14: 00000000006f4c70 R15: 00000000ffffffff
Allocated by task 9552:
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xa0/0xd0 mm/kasan/kasan.c:553
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc_node mm/slub.c:2706 [inline]
kmem_cache_alloc_node+0xe3/0x2e0 mm/slub.c:2742
alloc_task_struct_node kernel/fork.c:157 [inline]
dup_task_struct kernel/fork.c:802 [inline]
copy_process.part.26+0x1a98/0x6c70 kernel/fork.c:1707
copy_process kernel/fork.c:1664 [inline]
_do_fork+0x1c6/0xe60 kernel/fork.c:2175
do_syscall_64+0xc8/0x580 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 9552:
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x12e/0x180 mm/kasan/kasan.c:521
slab_free_hook mm/slub.c:1371 [inline]
slab_free_freelist_hook mm/slub.c:1398 [inline]
slab_free mm/slub.c:2953 [inline]
kmem_cache_free+0xbd/0x320 mm/slub.c:2969
copy_process.part.26+0x18d9/0x6c70 kernel/fork.c:2107
copy_process kernel/fork.c:1664 [inline]
_do_fork+0x1c6/0xe60 kernel/fork.c:2175
do_syscall_64+0xc8/0x580 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8883780cd080
which belongs to the cache task_struct of size 9992
The buggy address is located 32 bytes inside of
9992-byte region [ffff8883780cd080, ffff8883780cf788)
The buggy address belongs to the page:
page:ffffea000de03200 count:1 mapcount:0 mapping:ffff888107d07a00 index:0x0 compound_mapcount: 0
flags: 0x2fffff80008100(slab|head)
raw: 002fffff80008100 dead000000000100 dead000000000200 ffff888107d07a00
raw: 0000000000000000 0000000080030003 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8883780ccf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8883780cd000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8883780cd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8883780cd100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8883780cd180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
>
--
Thanks,
Xie XiuQi
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