================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 Read of size 8 at addr ffff8880784b9ab0 by task syz-executor.3/5328 CPU: 0 PID: 5328 Comm: syz-executor.3 Tainted: G W 5.17.0-syzkaller-02237-g1bc191051dca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xa5/0x3e0 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:137 tty_release+0x657/0x1200 drivers/tty/tty_io.c:1781 __fput+0x286/0x9f0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xaff/0x2a30 kernel/exit.c:806 do_group_exit+0xd2/0x2f0 kernel/exit.c:936 get_signal+0x4b0/0x28c0 kernel/signal.c:2903 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:149 [inline] exit_to_user_mode_loop kernel/entry/common.c:187 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:222 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:315 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f35549 Code: Unable to access opcode bytes at RIP 0xf7f3551f. RSP: 002b:00000000f7f3067c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000f6f5afa8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f6f5afac RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5309: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:584 [inline] io_arm_poll_handler+0x39d/0x940 fs/io_uring.c:6248 io_queue_sqe_arm_apoll+0x6d/0x430 fs/io_uring.c:7499 __io_queue_sqe fs/io_uring.c:7541 [inline] io_queue_sqe fs/io_uring.c:7568 [inline] io_submit_sqe fs/io_uring.c:7776 [inline] io_submit_sqes+0x7dda/0x9310 fs/io_uring.c:7882 __do_sys_io_uring_enter+0x9f1/0x1520 fs/io_uring.c:10924 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 10: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:215 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3523 [inline] kfree+0xd6/0x4d0 mm/slub.c:4576 io_flush_apoll_cache fs/io_uring.c:10038 [inline] io_ring_ctx_free fs/io_uring.c:10064 [inline] io_ring_exit_work+0x7f7/0x1053 fs/io_uring.c:10244 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880784b9a80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 48 bytes inside of 96-byte region [ffff8880784b9a80, ffff8880784b9ae0) The buggy address belongs to the page: page:ffffea0001e12e40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x784b9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888010c41780 raw: 0000000000000000 0000000000200020 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5309, ts 140946929491, free_ts 134323951413 prep_new_page mm/page_alloc.c:2382 [inline] get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4123 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5349 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2262 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8d0/0xf30 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3269 kmalloc include/linux/slab.h:584 [inline] io_arm_poll_handler+0x39d/0x940 fs/io_uring.c:6248 io_queue_sqe_arm_apoll+0x6d/0x430 fs/io_uring.c:7499 __io_queue_sqe fs/io_uring.c:7541 [inline] io_queue_sqe fs/io_uring.c:7568 [inline] io_submit_sqe fs/io_uring.c:7776 [inline] io_submit_sqes+0x7dda/0x9310 fs/io_uring.c:7882 __do_sys_io_uring_enter+0x9f1/0x1520 fs/io_uring.c:10924 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] free_pcp_prepare+0x548/0xd10 mm/page_alloc.c:1400 free_unref_page_prepare mm/page_alloc.c:3269 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3364 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:380 apply_to_pte_range mm/memory.c:2547 [inline] apply_to_pmd_range mm/memory.c:2591 [inline] apply_to_pud_range mm/memory.c:2627 [inline] apply_to_p4d_range mm/memory.c:2663 [inline] __apply_to_page_range+0x686/0x1030 mm/memory.c:2697 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:490 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1729 _vm_unmap_aliases.part.0+0x3f0/0x500 mm/vmalloc.c:2134 _vm_unmap_aliases mm/vmalloc.c:2108 [inline] vm_unmap_aliases+0x45/0x50 mm/vmalloc.c:2157 change_page_attr_set_clr+0x241/0x500 arch/x86/mm/pat/set_memory.c:1743 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1800 [inline] set_memory_ro+0x78/0xa0 arch/x86/mm/pat/set_memory.c:1946 bpf_jit_binary_lock_ro include/linux/filter.h:889 [inline] bpf_int_jit_compile+0xe92/0x1240 arch/x86/net/bpf_jit_comp.c:2382 bpf_prog_select_runtime+0x46b/0x780 kernel/bpf/core.c:1931 bpf_migrate_filter+0x2dc/0x380 net/core/filter.c:1294 bpf_prepare_filter net/core/filter.c:1342 [inline] bpf_prog_create_from_user+0x51b/0x660 net/core/filter.c:1436 seccomp_prepare_filter kernel/seccomp.c:669 [inline] seccomp_prepare_user_filter kernel/seccomp.c:706 [inline] seccomp_set_mode_filter kernel/seccomp.c:1834 [inline] do_seccomp+0x388/0x2890 kernel/seccomp.c:1954 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 Memory state around the buggy address: ffff8880784b9980: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8880784b9a00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8880784b9a80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8880784b9b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880784b9b80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================