================================================================== BUG: KASAN: slab-use-after-free in __do_sys_io_cancel fs/aio.c:2207 [inline] BUG: KASAN: slab-use-after-free in __se_sys_io_cancel fs/aio.c:2174 [inline] BUG: KASAN: slab-use-after-free in __x64_sys_io_cancel+0x40d/0x4a0 fs/aio.c:2174 Read of size 4 at addr ffff888113a58160 by task syz-executor.0/9056 CPU: 2 PID: 9056 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 __do_sys_io_cancel fs/aio.c:2207 [inline] __se_sys_io_cancel fs/aio.c:2174 [inline] __x64_sys_io_cancel+0x40d/0x4a0 fs/aio.c:2174 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f742aa7dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f742b8370c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d2 RAX: ffffffffffffffda RBX: 00007f742ababf80 RCX: 00007f742aa7dda9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 00007f742b816000 RBP: 00007f742aaca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f742ababf80 R15: 00007ffc912873f8 Allocated by task 9056: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x123/0x1df0 fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit fs/aio.c:2083 [inline] __x64_sys_io_submit+0x1c3/0x360 fs/aio.c:2083 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 23: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x129/0x360 mm/slub.c:4363 iocb_destroy fs/aio.c:1112 [inline] iocb_put fs/aio.c:1212 [inline] iocb_put fs/aio.c:1208 [inline] aio_poll_complete_work+0x6b8/0xb70 fs/aio.c:1767 process_one_work+0x889/0x15e0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:551 insert_work+0x38/0x230 kernel/workqueue.c:1653 __queue_work+0x62e/0x11d0 kernel/workqueue.c:1802 queue_work_on+0xf4/0x120 kernel/workqueue.c:1837 queue_work include/linux/workqueue.h:548 [inline] schedule_work include/linux/workqueue.h:609 [inline] aio_poll_cancel fs/aio.c:1779 [inline] aio_poll_cancel+0x1c2/0x230 fs/aio.c:1771 __do_sys_io_cancel fs/aio.c:2196 [inline] __se_sys_io_cancel fs/aio.c:2174 [inline] __x64_sys_io_cancel+0x1c2/0x4a0 fs/aio.c:2174 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff888113a58140 which belongs to the cache aio_kiocb of size 216 The buggy address is located 32 bytes inside of freed 216-byte region [ffff888113a58140, ffff888113a58218) The buggy address belongs to the physical page: page:ffffea00044e9600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888113a58000 pfn:0x113a58 head:ffffea00044e9600 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000840(slab|head|node=1|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 057ff00000000840 ffff888018ec7900 dead000000000122 0000000000000000 raw: ffff888113a58000 0000000080190018 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 19314, tgid 19302 (syz-executor.1), ts 368393660816, free_ts 368390894667 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc+0x2ed/0x320 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x123/0x1df0 fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit fs/aio.c:2083 [inline] __x64_sys_io_submit+0x1c3/0x360 fs/aio.c:2083 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 5163 tgid 5162 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 mm_free_pgd kernel/fork.c:801 [inline] __mmdrop+0xd7/0x480 kernel/fork.c:917 mmdrop include/linux/sched/mm.h:54 [inline] mmdrop_sched include/linux/sched/mm.h:82 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:109 [inline] finish_task_switch.isra.0+0x7ac/0xcb0 kernel/sched/core.c:5299 context_switch kernel/sched/core.c:5403 [inline] __schedule+0xf1a/0x5c60 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xe9/0x280 kernel/sched/core.c:6817 futex_wait_queue+0xfe/0x1f0 kernel/futex/waitwake.c:370 __futex_wait+0x292/0x3c0 kernel/futex/waitwake.c:669 futex_wait+0xea/0x390 kernel/futex/waitwake.c:697 do_futex+0x22b/0x350 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex kernel/futex/syscalls.c:160 [inline] __x64_sys_futex+0x1e1/0x4c0 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff888113a58000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113a58080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc >ffff888113a58100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff888113a58180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113a58200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================