================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_add_negative include/asm-generic/atomic-instrumented.h:556 [inline] BUG: KASAN: use-after-free in get_ucounts kernel/ucount.c:152 [inline] BUG: KASAN: use-after-free in get_ucounts kernel/ucount.c:150 [inline] BUG: KASAN: use-after-free in alloc_ucounts+0x19b/0x5b0 kernel/ucount.c:188 Write of size 4 at addr ffff88802bfedc1c by task syz-executor.5/7512 CPU: 0 PID: 7512 Comm: syz-executor.5 Not tainted 5.14.0-rc2-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:105 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_add_negative include/asm-generic/atomic-instrumented.h:556 [inline] get_ucounts kernel/ucount.c:152 [inline] get_ucounts kernel/ucount.c:150 [inline] alloc_ucounts+0x19b/0x5b0 kernel/ucount.c:188 set_cred_ucounts+0x171/0x3a0 kernel/cred.c:684 __sys_setuid+0x285/0x400 kernel/sys.c:623 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: 0033:0x4665e9 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:00007fe4d6729188 EFLAGS: 00000246 ORIG_RAX: 0000000000000069 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000ffffff RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffea28663f R14: 00007fe4d6729300 R15: 0000000000022000 Allocated by task 7498: kasan_save_stack+0x1b/0x40 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+0x98/0xc0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x1e4/0x480 mm/slab.c:3575 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_ucounts+0x23d/0x5b0 kernel/ucount.c:169 set_cred_ucounts+0x171/0x3a0 kernel/cred.c:684 __sys_setuid+0x285/0x400 kernel/sys.c:623 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 7512: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xcd/0x100 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x106/0x2c0 mm/slab.c:3803 put_ucounts kernel/ucount.c:200 [inline] put_ucounts+0x117/0x150 kernel/ucount.c:192 put_cred_rcu+0x27a/0x520 kernel/cred.c:124 rcu_do_batch kernel/rcu/tree.c:2550 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435 kobject_uevent_env+0xf8f/0x1650 lib/kobject_uevent.c:618 kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208 uevent_store+0x20/0x50 drivers/base/core.c:2370 dev_attr_store+0x50/0x80 drivers/base/core.c:2071 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 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 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] addr_event.part.0+0x31c/0x4d0 drivers/infiniband/core/roce_gid_mgmt.c:853 addr_event drivers/infiniband/core/roce_gid_mgmt.c:824 [inline] inet6addr_event+0x13e/0x1b0 drivers/infiniband/core/roce_gid_mgmt.c:883 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:217 addrconf_ifdown.isra.0+0xa58/0x15b0 net/ipv6/addrconf.c:3821 addrconf_notify+0x606/0x2400 net/ipv6/addrconf.c:3631 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2122 call_netdevice_notifiers_extack net/core/dev.c:2134 [inline] call_netdevice_notifiers net/core/dev.c:2148 [inline] dev_close_many+0x2ff/0x620 net/core/dev.c:1723 unregister_netdevice_many+0x3ff/0x1790 net/core/dev.c:11052 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11605 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88802bfedc00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 28 bytes inside of 192-byte region [ffff88802bfedc00, ffff88802bfedcc0) The buggy address belongs to the page: page:ffffea0000affb40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bfed flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007548c8 ffffea0000a82a48 ffff888010840000 raw: 0000000000000000 ffff88802bfed000 0000000100000010 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 0x242040(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 1, ts 17170806825, free_ts 0 prep_new_page mm/page_alloc.c:2433 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4166 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5388 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 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+0x3d5/0x4d0 mm/slab.c:3711 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_commit_ok+0x1e/0x90 security/tomoyo/memory.c:76 tomoyo_update_domain+0x5de/0x850 security/tomoyo/domain.c:139 tomoyo_update_mkdev_acl+0x148/0x220 security/tomoyo/file.c:477 tomoyo_write_file+0x3a4/0x7f0 security/tomoyo/file.c:1040 tomoyo_write_domain2+0x116/0x1d0 security/tomoyo/common.c:1152 tomoyo_add_entry security/tomoyo/common.c:2042 [inline] tomoyo_supervisor+0xbc9/0xf00 security/tomoyo/common.c:2103 tomoyo_audit_mkdev_log security/tomoyo/file.c:197 [inline] tomoyo_mkdev_perm+0x3a7/0x510 security/tomoyo/file.c:885 tomoyo_path_mknod+0x12c/0x190 security/tomoyo/tomoyo.c:229 security_path_mknod+0xf9/0x170 security/security.c:1131 init_mknod+0x1cf/0x2ba fs/init.c:158 create_dev init/do_mounts.h:20 [inline] mount_root+0x173/0x1f5 init/do_mounts.c:551 page_owner free stack trace missing Memory state around the buggy address: ffff88802bfedb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802bfedb80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88802bfedc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802bfedc80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802bfedd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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