KASAN: use-after-free Read in kobject

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in kobject_put kernel	19	C			12	2357d	2488d	11/29	fixed on 2019/03/28 12:00
linux-4.19	KASAN: use-after-free Read in kobject_put	19				1	2080d	2080d	0/1	auto-closed as invalid on 2020/03/31 04:14

R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000006 R13: 00000000004ca8c7 R14: 00000000004e3aa8 R15: 0000000000000005 input: syz1 as /devices/virtual/input/input88 ================================================================== BUG: KASAN: use-after-free in kobject_cleanup lib/kobject.c:630 [inline] BUG: KASAN: use-after-free in kobject_release lib/kobject.c:675 [inline] BUG: KASAN: use-after-free in kref_put include/linux/kref.h:70 [inline] BUG: KASAN: use-after-free in kobject_put.cold+0x2e7/0x2f9 lib/kobject.c:692 Read of size 1 at addr ffff8880549fdd24 by task syz-executor.4/18740 CPU: 1 PID: 18740 Comm: syz-executor.4 Not tainted 4.14.157-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 kobject_cleanup lib/kobject.c:630 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x2e7/0x2f9 lib/kobject.c:692 cdev_put.part.0+0x39/0x50 fs/char_dev.c:374 cdev_put+0x20/0x30 fs/char_dev.c:372 __fput+0x648/0x7a0 fs/file_table.c:214 ____fput+0x16/0x20 fs/file_table.c:244 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a679 RSP: 002b:00007fd4f7e43c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000021 RAX: 0000000000000004 RBX: 0000000000000002 RCX: 000000000045a679 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000000000000b RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd4f7e446d4 R13: 00000000004c0f40 R14: 00000000004d4aa8 R15: 00000000ffffffff SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 Allocated by task 18734: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] evdev_connect+0x76/0x4a0 drivers/input/evdev.c:1383 input_attach_handler+0x154/0x1a0 drivers/input/input.c:1004 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 input_register_device.cold+0xbf/0x202 drivers/input/input.c:2161 uinput_create_device drivers/input/misc/uinput.c:324 [inline] uinput_ioctl_handler.isra.0+0xdc8/0x18a0 drivers/input/misc/uinput.c:839 uinput_ioctl+0x4a/0x60 drivers/input/misc/uinput.c:1010 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=0 sclass=netlink_audit_socket pig=18749 comm=syz-executor.5 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 18765: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 kobject: 'loop3' (ffff8880a4086360): kobject_uevent_env save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 evdev_free+0x5e/0x70 drivers/input/evdev.c:364 device_release+0x7b/0x1a0 drivers/base/core.c:821 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x269/0x2f9 lib/kobject.c:692 cdev_default_release+0x41/0x50 fs/char_dev.c:613 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x269/0x2f9 lib/kobject.c:692 cdev_put.part.0+0x39/0x50 fs/char_dev.c:374 cdev_put fs/char_dev.c:372 [inline] chrdev_open+0x266/0x590 fs/char_dev.c:431 do_dentry_open+0x73b/0xeb0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:891 do_last fs/namei.c:3425 [inline] path_openat+0x8bd/0x3f70 fs/namei.c:3566 do_filp_open+0x18e/0x250 fs/namei.c:3600 do_sys_open+0x2c5/0x430 fs/open.c:1084 SYSC_open fs/open.c:1102 [inline] SyS_open+0x2d/0x40 fs/open.c:1097 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 kobject: 'loop3' (ffff8880a4086360): fill_kobj_path: path = '/devices/virtual/block/loop3' entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880549fd740 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1508 bytes inside of 2048-byte region [ffff8880549fd740, ffff8880549fdf40) The buggy address belongs to the page: page:ffffea0001527f00 count:1 mapcount:0 mapping:ffff8880549fc640 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff8880549fc640 0000000000000000 0000000100000003 raw: ffffea000176e620 ffffea0002a71720 ffff8880aa800c40 0000000000000000 hfsplus: session requires an argument page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880549fdc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880549fdc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880549fdd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880549fdd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880549fde00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== kobject: 'event4' (ffff888084718ff8): kobject_add_internal: parent: 'input88', set: 'devices' hfsplus: unable to parse mount options kobject: 'event4' (ffff888084718ff8): kobject_uevent_env