Messages in this thread | | | Date | Thu, 26 Oct 2017 10:58:47 -0700 | From | Tejun Heo <> | Subject | Re: KASAN: use-after-free Read in get_work_pool |
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Hello,
On Thu, Oct 26, 2017 at 09:35:44AM -0700, syzbot wrote: > BUG: KASAN: use-after-free in __read_once_size > include/linux/compiler.h:276 [inline] > BUG: KASAN: use-after-free in atomic64_read > arch/x86/include/asm/atomic64_64.h:21 [inline] > BUG: KASAN: use-after-free in atomic_long_read > include/asm-generic/atomic-long.h:44 [inline] > BUG: KASAN: use-after-free in get_work_pool+0x1c2/0x1e0 > kernel/workqueue.c:709 > Read of size 8 at addr ffff8801cc58c378 by task syz-executor5/21326 > > CPU: 1 PID: 21326 Comm: syz-executor5 Not tainted 4.13.0+ #43 > Hardware name: Google Google Compute Engine/Google Compute Engine, > BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:52 > print_address_description+0x73/0x250 mm/kasan/report.c:252 > kasan_report_error mm/kasan/report.c:351 [inline] > kasan_report+0x24e/0x340 mm/kasan/report.c:409 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 > __read_once_size include/linux/compiler.h:276 [inline] > atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline] > atomic_long_read include/asm-generic/atomic-long.h:44 [inline] > get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:709 > __queue_work+0x235/0x1150 kernel/workqueue.c:1401 > queue_work_on+0x16a/0x1c0 kernel/workqueue.c:1486 > queue_work include/linux/workqueue.h:489 [inline] > strp_check_rcv+0x25/0x30 net/strparser/strparser.c:553 > kcm_attach net/kcm/kcmsock.c:1439 [inline] > kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline] > kcm_ioctl+0x826/0x1610 net/kcm/kcmsock.c:1695 > sock_do_ioctl+0x65/0xb0 net/socket.c:961 > sock_ioctl+0x2c2/0x440 net/socket.c:1058 > vfs_ioctl fs/ioctl.c:45 [inline] > do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 > SYSC_ioctl fs/ioctl.c:700 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 > entry_SYSCALL_64_fastpath+0x1f/0xbe
Looks like kcm is trying to reuse a work item whose last workqueue has been destroyed without re-initing it. A work item needs to be reinit'd.
Thanks.
-- tejun
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