================================================================== BUG: KASAN: double-free or invalid-free in security_tun_dev_free_security+0x3e/0x70 security/security.c:2342 CPU: 1 PID: 23288 Comm: syz-executor.5 Not tainted 5.16.0-rc3-syzkaller #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+0x8d/0x2ed mm/kasan/report.c:247 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:372 ____kasan_slab_free mm/kasan/common.c:346 [inline] __kasan_slab_free+0xf6/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x10d/0x2c0 mm/slab.c:3802 security_tun_dev_free_security+0x3e/0x70 security/security.c:2342 tun_free_netdev+0xdc/0x140 drivers/net/tun.c:2215 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:10630 __tun_chr_ioctl.isra.0+0x9a1/0x4230 drivers/net/tun.c:3302 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fd05b448ae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd05a3be188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd05b55bf60 RCX: 00007fd05b448ae9 RDX: 00000000200000c0 RSI: 00000000400454ca RDI: 0000000000000005 RBP: 00007fd05b4a2ff7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffebda7d03f R14: 00007fd05a3be300 R15: 0000000000022000 Allocated by task 23288: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3575 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] selinux_tun_dev_alloc_security+0x43/0x180 security/selinux/hooks.c:5594 security_tun_dev_alloc_security+0x40/0x90 security/security.c:2336 __tun_chr_ioctl.isra.0+0x27e6/0x4230 drivers/net/tun.c:2727 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 23288: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x10d/0x2c0 mm/slab.c:3802 security_tun_dev_free_security+0x3e/0x70 security/security.c:2342 __tun_chr_ioctl.isra.0+0x2cbf/0x4230 drivers/net/tun.c:2782 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880131b8200 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8880131b8200, ffff8880131b8220) The buggy address belongs to the page: page:ffffea00004c6e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880131b8fc1 pfn:0x131b8 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007cdbc8 ffffea00004c7708 ffff888010c40100 raw: ffff8880131b8fc1 ffff8880131b8000 000000010000003f 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 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 1, ts 2362036661, free_ts 2296501946 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x470 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] __do_kmalloc mm/slab.c:3700 [inline] __kmalloc+0x3b3/0x4d0 mm/slab.c:3711 acpi_ns_internalize_name drivers/acpi/acpica/nsutils.c:331 [inline] acpi_ns_internalize_name+0xf2/0x1a1 drivers/acpi/acpica/nsutils.c:312 acpi_ns_get_node_unlocked drivers/acpi/acpica/nsutils.c:666 [inline] acpi_ns_get_node_unlocked+0x1d8/0x278 drivers/acpi/acpica/nsutils.c:635 acpi_ns_get_node+0x4b/0x6a drivers/acpi/acpica/nsutils.c:726 acpi_get_handle+0x129/0x211 drivers/acpi/acpica/nsxfname.c:98 acpi_has_method+0x6e/0xb0 drivers/acpi/utils.c:553 acpi_device_setup_files+0x2fe/0x680 drivers/acpi/device_sysfs.c:571 __acpi_device_add+0x59d/0xc10 drivers/acpi/scan.c:728 acpi_add_single_object+0x95e/0x1aa0 drivers/acpi/scan.c:1823 acpi_bus_check_add+0x1ad/0x5d0 drivers/acpi/scan.c:2052 acpi_ns_walk_namespace+0x23d/0x41f drivers/acpi/acpica/nswalk.c:237 acpi_walk_namespace drivers/acpi/acpica/nsxfeval.c:606 [inline] acpi_walk_namespace+0xee/0x127 drivers/acpi/acpica/nsxfeval.c:554 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 slab_destroy mm/slab.c:1627 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1647 cache_flusharray mm/slab.c:3418 [inline] ___cache_free+0x4cc/0x610 mm/slab.c:3480 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x4e/0x110 mm/kasan/quarantine.c:165 kasan_quarantine_remove_cache+0xd2/0xf0 mm/kasan/quarantine.c:338 kmem_cache_shrink+0x9/0x20 mm/slab_common.c:530 acpi_os_purge_cache+0x11/0x20 drivers/acpi/osl.c:1663 acpi_purge_cached_objects+0x37/0xd0 drivers/acpi/acpica/utxface.c:237 acpi_initialize_objects+0x2b/0x95 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init drivers/acpi/bus.c:1236 [inline] acpi_init+0x1cd/0x971 drivers/acpi/bus.c:1323 do_one_initcall+0x103/0x650 init/main.c:1297 do_initcall_level init/main.c:1370 [inline] do_initcalls init/main.c:1386 [inline] do_basic_setup init/main.c:1405 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1610 kernel_init+0x1a/0x1d0 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff8880131b8100: 05 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc ffff8880131b8180: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc >ffff8880131b8200: fa fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc ^ ffff8880131b8280: 00 00 01 fc fc fc fc fc 00 00 01 fc fc fc fc fc ffff8880131b8300: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc ==================================================================