KASAN: use-after-free Read in binder_release_work

From: syzbot
Date: Tue Apr 03 2018 - 23:02:23 EST

Next message: Xidong Wang: "[PATCH 1/1] mtd:nand:fix memory leak"
Previous message: syzbot: "WARNING in hfs_bnode_create"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot hit the following crash on upstream commit
f2d285669aae656dfeafa0bf25e86bbbc5d22329 (Tue Apr 3 17:45:39 2018 +0000)
Merge tag 'pm-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=0cf1f1aa154f56ff2e8d

So far this crash happened 4 times on upstream.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4827186146050048
syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6025869373997056
Raw console output: https://syzkaller.appspot.com/x/log.txt?id=4772918563176448
Kernel config: https://syzkaller.appspot.com/x/.config?id=686016073509112605
compiler: gcc (GCC) 7.1.1 20170620

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0cf1f1aa154f56ff2e8d@xxxxxxxxxxxxxxxxxxxxxxxxx
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.

binder: 4616:4618 transaction failed 29189/-3, size 0-0 line 2963
binder: release 4616:4618 transaction 114 in, still active
binder: send failed reply for transaction 114 to 4616:4618
binder: 4620:4621 ioctl 400448c8 20000200 returned -22
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0x144/0x150 lib/list_debug.c:54
Read of size 8 at addr ffff8801d39a4210 by task kworker/1:2/1891

CPU: 1 PID: 1891 Comm: kworker/1:2 Not tainted 4.16.0+ #378
binder: release 4620:4621 transaction 118 out, still active
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events binder_deferred_func
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1a7/0x27d lib/dump_stack.c:53
binder: release 4620:4621 transaction 117 in, still active
print_address_description+0x73/0x250 mm/kasan/report.c:256
binder: undelivered TRANSACTION_COMPLETE
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report+0x23c/0x360 mm/kasan/report.c:412
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
binder: BINDER_SET_CONTEXT_MGR already set
__list_del_entry_valid+0x144/0x150 lib/list_debug.c:54
binder: 4620:4622 ioctl 40046207 0 returned -16
__list_del_entry include/linux/list.h:117 [inline]
list_del_init include/linux/list.h:159 [inline]
binder_dequeue_work_head_ilocked drivers/android/binder.c:893 [inline]
binder_dequeue_work_head drivers/android/binder.c:913 [inline]
binder_release_work+0x163/0x4b0 drivers/android/binder.c:4191
binder: 4620:4621 ioctl c0306201 20004000 returned -14
binder: 4620:4621 ioctl 400448c8 20000200 returned -22
binder_thread_release+0x4e1/0x730 drivers/android/binder.c:4396
binder_alloc: binder_alloc_mmap_handler: 4620 2000c000-2000e000 already mapped failed -16
binder_deferred_release drivers/android/binder.c:4939 [inline]
binder_deferred_func+0x4f4/0x1350 drivers/android/binder.c:5022
binder_alloc: 4620: binder_alloc_buf, no vma
binder: 4620:4623 transaction failed 29189/-3, size 0-0 line 2963
process_one_work+0xc97/0x1c40 kernel/workqueue.c:2113
binder_alloc: 4620: binder_alloc_buf, no vma
binder: 4620:4621 transaction failed 29189/-3, size 0-0 line 2963
binder: release 4620:4622 transaction 118 in, still active
binder: release 4620:4622 transaction 117 out, still active
worker_thread+0x1c3/0x1380 kernel/workqueue.c:2247
binder: send failed reply for transaction 118, target dead
binder: send failed reply for transaction 117, target dead
binder: BINDER_SET_CONTEXT_MGR already set
binder: 4624:4625 ioctl 40046207 0 returned -16
kthread+0x33c/0x400 kernel/kthread.c:238
binder: 4624:4625 ioctl 400448c8 20000200 returned -22
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411

binder_alloc: 4620: binder_alloc_buf, no vma
Allocated by task 4618:
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
binder: 4624:4626 transaction failed 29189/-3, size 0-0 line 2963
kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3608
kmalloc include/linux/slab.h:512 [inline]
kzalloc include/linux/slab.h:701 [inline]
binder_transaction+0x13d2/0x8200 drivers/android/binder.c:2900
binder_thread_write+0xcf1/0x38b0 drivers/android/binder.c:3513
binder_ioctl_write_read.isra.39+0x261/0xcb0 drivers/android/binder.c:4451
binder_ioctl+0xb72/0x1417 drivers/android/binder.c:4591
binder: undelivered TRANSACTION_ERROR: 29189
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
ksys_ioctl+0x94/0xb0 fs/ioctl.c:701
SYSC_ioctl fs/ioctl.c:708 [inline]
SyS_ioctl+0x24/0x30 fs/ioctl.c:706
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
binder: 4624:4626 ioctl c0306201 20004000 returned -14

Freed by task 1891:
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
__kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
__cache_free mm/slab.c:3486 [inline]
kfree+0xd9/0x260 mm/slab.c:3801
binder: BINDER_SET_CONTEXT_MGR already set
binder_free_transaction+0x6a/0xa0 drivers/android/binder.c:1966
binder_send_failed_reply+0x1c9/0x380 drivers/android/binder.c:2005
binder_thread_release+0x4cc/0x730 drivers/android/binder.c:4395
binder_deferred_release drivers/android/binder.c:4939 [inline]
binder_deferred_func+0x4f4/0x1350 drivers/android/binder.c:5022
process_one_work+0xc97/0x1c40 kernel/workqueue.c:2113
worker_thread+0x1c3/0x1380 kernel/workqueue.c:2247
kthread+0x33c/0x400 kernel/kthread.c:238
binder: 4624:4627 ioctl 40046207 0 returned -16
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411

The buggy address belongs to the object at ffff8801d39a4200
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 16 bytes inside of
192-byte region [ffff8801d39a4200, ffff8801d39a42c0)
The buggy address belongs to the page:
page:ffffea00074e6900 count:1 mapcount:0 mapping:ffff8801d39a4000 index:0x0
binder: 4624:4626 ioctl 400448c8 20000200 returned -22
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d39a4000 0000000000000000 0000000100000010
raw: ffffea000738fbe0 ffffea00074e6a60 ffff8801dac00040 0000000000000000
page dumped because: kasan: bad access detected

binder_alloc: binder_alloc_mmap_handler: 4624 2000c000-2000e000 already mapped failed -16
Memory state around the buggy address:
ffff8801d39a4100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8801d39a4180: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc

ffff8801d39a4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

^
ffff8801d39a4280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
binder_alloc: 4620: binder_alloc_buf, no vma
ffff8801d39a4300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@xxxxxxxxxxxxxxxxx

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.

Next message: Xidong Wang: "[PATCH 1/1] mtd:nand:fix memory leak"
Previous message: syzbot: "WARNING in hfs_bnode_create"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]