On Tue, Apr 03, 2018 at 08:02:02PM -0700, syzbot wrote: > 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@xxxxxxxxxxxxxxxx. > > 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 Martijn, this is going to be fixed by https://patchwork.kernel.org/patch/10312345/ ("ANDROID: binder: prevent transactions into own process"), right? The syzbot bug ID in that patch is for a bug that is already closed, so if it's not too late you should use this one. - Eric _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
