do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 ================================================================== BUG: KASAN: use-after-free in io_queue_sqe fs/io_uring.c:2523 [inline] BUG: KASAN: use-after-free in io_queue_link_head+0x323/0x3d0 fs/io_uring.c:2538 Read of size 8 at addr ffff8881dbadc7d0 by task syz-executor.0/417 CPU: 0 PID: 417 Comm: syz-executor.0 Not tainted 5.4.265-syzkaller-04832-g4d7b888b5774 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 io_queue_sqe fs/io_uring.c:2523 [inline] io_queue_link_head+0x323/0x3d0 fs/io_uring.c:2538 io_ring_submit fs/io_uring.c:2980 [inline] __do_sys_io_uring_enter fs/io_uring.c:3761 [inline] __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3722 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 417: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 io_get_req+0x110/0x580 fs/io_uring.c:661 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2588 io_ring_submit fs/io_uring.c:2976 [inline] __do_sys_io_uring_enter fs/io_uring.c:3761 [inline] __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3722 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 417: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096 io_queue_sqe fs/io_uring.c:2522 [inline] io_queue_link_head+0x30d/0x3d0 fs/io_uring.c:2538 io_ring_submit fs/io_uring.c:2980 [inline] __do_sys_io_uring_enter fs/io_uring.c:3761 [inline] __se_sys_io_uring_enter+0xc35/0x2030 fs/io_uring.c:3722 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881dbadc780 which belongs to the cache io_kiocb of size 264 The buggy address is located 80 bytes inside of 264-byte region [ffff8881dbadc780, ffff8881dbadc888) The buggy address belongs to the page: page:ffffea00076eb700 refcount:1 mapcount:0 mapping:ffff8881f0f25900 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0f25900 raw: 0000000000000000 0000000080150015 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x109/0x250 mm/slub.c:2842 io_get_req+0x110/0x580 fs/io_uring.c:661 io_submit_sqe+0x84/0xe90 fs/io_uring.c:2588 io_ring_submit fs/io_uring.c:2976 [inline] __do_sys_io_uring_enter fs/io_uring.c:3761 [inline] __se_sys_io_uring_enter+0x8e8/0x2030 fs/io_uring.c:3722 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages mm/page_alloc.c:4959 [inline] free_pages+0xf6/0x1b0 mm/page_alloc.c:4967 stack_depot_save+0x42b/0x480 lib/stackdepot.c:300 save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x1d9/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0xdc/0x260 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] selinux_sk_alloc_security+0x71/0x190 security/selinux/hooks.c:5213 security_sk_alloc+0x6d/0xa0 security/security.c:2091 sk_prot_alloc+0x14c/0x3e0 net/core/sock.c:1625 sk_alloc+0x35/0x2f0 net/core/sock.c:1680 unix_create1+0x8e/0x5a0 net/unix/af_unix.c:802 unix_create+0x12c/0x1b0 net/unix/af_unix.c:863 __sock_create+0x3cb/0x7a0 net/socket.c:1425 io_uring_get_fd fs/io_uring.c:3850 [inline] io_uring_create fs/io_uring.c:3960 [inline] io_uring_setup fs/io_uring.c:3993 [inline] __do_sys_io_uring_setup fs/io_uring.c:4006 [inline] __se_sys_io_uring_setup+0x1a94/0x2450 fs/io_uring.c:4003 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881dbadc680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881dbadc700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881dbadc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881dbadc800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881dbadc880: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================