================================================================== 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+0x30b/0x310 fs/aio.c:2174 Read of size 4 at addr ffff8880784372a0 by task syz-executor.0/3332 CPU: 0 PID: 3332 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xf8/0x260 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 __do_sys_io_cancel fs/aio.c:2207 [inline] __se_sys_io_cancel+0x30b/0x310 fs/aio.c:2174 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fb9a0a7dda9 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:00007fb9a18240c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d2 RAX: ffffffffffffffda RBX: 00007fb9a0babf80 RCX: 00007fb9a0a7dda9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 00007fb9a17c9000 RBP: 00007fb9a0aca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb9a0babf80 R15: 00007ffeac9d98c8 Allocated by task 3332: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:314 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:340 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+0x15a/0x390 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x12e/0x1600 fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit+0x11c/0x330 fs/aio.c:2083 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 386: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:643 poison_slab_object+0xee/0x1a0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 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+0x136/0x330 mm/slub.c:4363 aio_poll_complete_work+0x418/0x620 fs/aio.c:1767 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x7e9/0xfd0 kernel/workqueue.c:2706 worker_thread+0x868/0xca0 kernel/workqueue.c:2787 kthread+0x267/0x2c0 kernel/kthread.c:388 ret_from_fork+0x32/0x60 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+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xae/0x100 mm/kasan/generic.c:589 insert_work+0x38/0x230 kernel/workqueue.c:1653 __queue_work+0x81f/0xa70 kernel/workqueue.c:1802 queue_work_on+0xf7/0x1a0 kernel/workqueue.c:1837 queue_work include/linux/workqueue.h:548 [inline] schedule_work include/linux/workqueue.h:609 [inline] aio_poll_cancel+0x98/0x150 fs/aio.c:1779 __do_sys_io_cancel fs/aio.c:2196 [inline] __se_sys_io_cancel+0xee/0x310 fs/aio.c:2174 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff888078437280 which belongs to the cache aio_kiocb of size 216 The buggy address is located 32 bytes inside of freed 216-byte region [ffff888078437280, ffff888078437358) The buggy address belongs to the physical page: page:ffffea0001e10dc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78437 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff88800e307a00 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3328, tgid 3327 (syz-executor.0), ts 57133622713, free_ts 56505551396 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x345c/0x3600 mm/page_alloc.c:3311 __alloc_pages+0x255/0x650 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+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x70/0x270 mm/slub.c:2407 ___slab_alloc+0xa79/0x10b0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc+0x235/0x390 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x12e/0x1600 fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit+0x11c/0x330 fs/aio.c:2083 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 3264 tgid 3264 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+0x896/0x9b0 mm/page_alloc.c:2346 free_unref_page_list+0x54e/0x7f0 mm/page_alloc.c:2532 release_pages+0x194b/0x1b10 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x273/0x3d0 mm/mmu_gather.c:300 tlb_finish_mmu+0xb6/0x1c0 mm/mmu_gather.c:392 exit_mmap+0x431/0xa40 mm/mmap.c:3292 __mmput+0x9b/0x2d0 kernel/fork.c:1343 exit_mm+0x113/0x1b0 kernel/exit.c:569 do_exit+0x7e2/0x2430 kernel/exit.c:858 do_group_exit+0x1b9/0x280 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1029 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff888078437180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078437200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888078437280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078437300: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff888078437380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================