================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline] BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541 Write of size 8 at addr ffff8881eb46f1c8 by task syz-executor.0/1552 CPU: 0 PID: 1552 Comm: syz-executor.0 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 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 hlist_add_head include/linux/list.h:814 [inline] enqueue_timer+0xb7/0x300 kernel/time/timer.c:541 __internal_add_timer kernel/time/timer.c:554 [inline] internal_add_timer+0x240/0x430 kernel/time/timer.c:604 __mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x879/0xbe0 kernel/time/timer.c:1817 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:538 [inline] smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:__list_add include/linux/list.h:63 [inline] RIP: 0010:list_add include/linux/list.h:79 [inline] RIP: 0010:link_va mm/vmalloc.c:538 [inline] RIP: 0010:insert_vmap_area+0x20a/0x2c0 mm/vmalloc.c:662 Code: 4d 8b 3e 4c 89 e7 4c 89 f6 4c 89 fa e8 ff 8b a2 00 84 c0 74 73 e8 86 58 d5 ff 49 8d 6f 08 48 89 e8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 ef e8 fc 3d 05 00 4c 89 65 00 4c 89 e0 48 c1 e8 03 42 RSP: 0018:ffff8881defdf078 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1103e6382de RBX: 1ffff1103e638259 RCX: 0000000000040000 RDX: ffffc9000194a000 RSI: 0000000000005c84 RDI: 0000000000005c85 RBP: ffff8881f31c16f0 R08: dffffc0000000000 R09: ffff8881ea7609d8 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881ea7609e8 R13: dffffc0000000000 R14: ffff8881f31c12c8 R15: ffff8881f31c16e8 alloc_vmap_area+0x191b/0x1ac0 mm/vmalloc.c:1120 __get_vm_area_node+0x1c7/0x310 mm/vmalloc.c:2066 __vmalloc_node_range+0xee/0x710 mm/vmalloc.c:2494 __vmalloc_node mm/vmalloc.c:2554 [inline] __vmalloc_node_flags mm/vmalloc.c:2568 [inline] vzalloc+0x70/0x80 mm/vmalloc.c:2613 bpf_check+0x17e/0xb340 kernel/bpf/verifier.c:9568 bpf_prog_load kernel/bpf/syscall.c:1724 [inline] __do_sys_bpf kernel/bpf/syscall.c:2891 [inline] __se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f70062650a9 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:00007f70055df0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f700639bf80 RCX: 00007f70062650a9 RDX: 0000000000000080 RSI: 0000000020000600 RDI: 0000000000000005 RBP: 00007f70062d4074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f700639bf80 R15: 00007ffee377d7b8 The buggy address belongs to the page: page:ffffea0007ad1bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 0000000000000000 ffffea0007ad1bc8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Unmovable, gfp_mask 0x146dc0(GFP_USER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP|__GFP_ZERO) 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:4893 __alloc_pages include/linux/gfp.h:503 [inline] __alloc_pages_node include/linux/gfp.h:516 [inline] alloc_pages_node include/linux/gfp.h:530 [inline] kmalloc_order mm/slab_common.c:1342 [inline] kmalloc_order_trace+0x2a/0x100 mm/slab_common.c:1358 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:761 [inline] kvzalloc include/linux/mm.h:769 [inline] alloc_netdev_mqs+0x85/0xc70 net/core/dev.c:9610 tun_set_iff+0x51f/0xdc0 drivers/net/tun.c:2888 __tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3182 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47 ksys_ioctl fs/ioctl.c:742 [inline] __do_sys_ioctl fs/ioctl.c:749 [inline] __se_sys_ioctl fs/ioctl.c:747 [inline] __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747 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:4955 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4961 device_release+0x6b/0x190 drivers/base/core.c:1776 kobject_cleanup lib/kobject.c:716 [inline] kobject_release lib/kobject.c:747 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e6/0x2f0 lib/kobject.c:764 netdev_run_todo+0xc44/0xdf0 net/core/dev.c:9469 tun_detach drivers/net/tun.c:766 [inline] tun_chr_close+0xc1/0x130 drivers/net/tun.c:3558 __fput+0x262/0x680 fs/file_table.c:281 task_work_run+0x140/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x190/0x1a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881eb46f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881eb46f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881eb46f180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881eb46f200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881eb46f280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 10 Comm: ksoftirqd/0 Tainted: G B 5.4.274-syzkaller-00002-g6f97bd951d82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline] RIP: 0010:__run_timers+0x7b0/0xbe0 kernel/time/timer.c:1817 Code: 89 e7 e8 83 4e 3f 00 4d 89 2c 24 4d 85 ed 74 2e e8 e5 68 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 52 4e 3f 00 4d 89 65 00 eb 05 e8 b7 RSP: 0018:ffff8881f5ddfba0 EFLAGS: 00010802 RAX: 1bd5a00000000025 RBX: 1ffff1103d68de39 RCX: dffffc0000000000 RDX: 0000000080000101 RSI: 0000000000000008 RDI: ffff8881eb46f1c8 RBP: ffff8881f5ddfd08 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881f5ddfc60 R13: dead00000000012a R14: 1ffff1103d68de38 R15: ffff8881eb46f1c8 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000005e0e000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:603 smpboot_thread_fn+0x545/0x930 kernel/smpboot.c:165 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Modules linked in: ---[ end trace 182ae82e7d4f3a57 ]--- RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1482 [inline] RIP: 0010:__run_timers+0x7b0/0xbe0 kernel/time/timer.c:1817 Code: 89 e7 e8 83 4e 3f 00 4d 89 2c 24 4d 85 ed 74 2e e8 e5 68 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 52 4e 3f 00 4d 89 65 00 eb 05 e8 b7 RSP: 0018:ffff8881f5ddfba0 EFLAGS: 00010802 RAX: 1bd5a00000000025 RBX: 1ffff1103d68de39 RCX: dffffc0000000000 RDX: 0000000080000101 RSI: 0000000000000008 RDI: ffff8881eb46f1c8 RBP: ffff8881f5ddfd08 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881f5ddfc60 R13: dead00000000012a R14: 1ffff1103d68de38 R15: ffff8881eb46f1c8 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000005e0e000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 4d 8b 3e mov (%r14),%r15 3: 4c 89 e7 mov %r12,%rdi 6: 4c 89 f6 mov %r14,%rsi 9: 4c 89 fa mov %r15,%rdx c: e8 ff 8b a2 00 call 0xa28c10 11: 84 c0 test %al,%al 13: 74 73 je 0x88 15: e8 86 58 d5 ff call 0xffd558a0 1a: 49 8d 6f 08 lea 0x8(%r15),%rbp 1e: 48 89 e8 mov %rbp,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 48 89 ef mov %rbp,%rdi 2f: e8 fc 3d 05 00 call 0x53e30 34: 4c 89 65 00 mov %r12,0x0(%rbp) 38: 4c 89 e0 mov %r12,%rax 3b: 48 c1 e8 03 shr $0x3,%rax 3f: 42 rex.X