================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:108 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x639/0x6b0 mm/filemap.c:169 Read of size 4 at addr ffff8881e0a41488 by task syz-executor.2/18319 CPU: 1 PID: 18319 Comm: syz-executor.2 Not tainted 5.4.233-syzkaller-00019-gd5ed2ca98e48 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 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 cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] cleancache_invalidate_page include/linux/cleancache.h:108 [inline] unaccount_page_cache_page+0x639/0x6b0 mm/filemap.c:169 __delete_from_page_cache+0xc3/0x510 mm/filemap.c:237 __remove_mapping+0x46e/0x550 mm/vmscan.c:978 shrink_page_list+0x2467/0x3e70 mm/vmscan.c:1482 shrink_inactive_list+0x4f6/0xfd0 mm/vmscan.c:2001 shrink_list mm/vmscan.c:2293 [inline] shrink_node_memcg+0xc42/0x2430 mm/vmscan.c:2623 shrink_node+0x396/0x12b0 mm/vmscan.c:2836 shrink_zones mm/vmscan.c:3053 [inline] do_try_to_free_pages+0x625/0x1280 mm/vmscan.c:3111 try_to_free_mem_cgroup_pages+0x3f6/0x9b0 mm/vmscan.c:3412 memory_max_write+0x235/0x3c0 mm/memcontrol.c:6220 cgroup_file_write+0x275/0x5c0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 18117: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x130/0x1d0 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] __kmalloc_track_caller+0xfb/0x290 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] pskb_expand_head+0x10d/0x1060 net/core/skbuff.c:1647 netlink_trim+0x198/0x230 net/netlink/af_netlink.c:1303 netlink_broadcast_filtered+0x62/0x1280 net/netlink/af_netlink.c:1508 netlink_broadcast net/netlink/af_netlink.c:1553 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2552 __dev_notify_flags+0xe3/0x510 net/core/dev.c:7959 dev_change_flags+0xe7/0x190 net/core/dev.c:8001 do_setlink+0xc4c/0x3b70 net/core/rtnetlink.c:2520 rtnl_group_changelink net/core/rtnetlink.c:3010 [inline] __rtnl_newlink net/core/rtnetlink.c:3168 [inline] rtnl_newlink+0x10fb/0x2010 net/core/rtnetlink.c:3289 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5262 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2509 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1347 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1943 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2287 ___sys_sendmsg net/socket.c:2341 [inline] __sys_sendmsg+0x28b/0x380 net/socket.c:2387 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 18117: 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+0x178/0x230 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] kfree+0xeb/0x320 mm/slub.c:4071 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb net/core/skbuff.c:689 [inline] consume_skb+0xa5/0x2a0 net/core/skbuff.c:849 netlink_broadcast_filtered+0x115f/0x1280 net/netlink/af_netlink.c:1531 netlink_broadcast net/netlink/af_netlink.c:1553 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2552 __dev_notify_flags+0xe3/0x510 net/core/dev.c:7959 dev_change_flags+0xe7/0x190 net/core/dev.c:8001 do_setlink+0xc4c/0x3b70 net/core/rtnetlink.c:2520 rtnl_group_changelink net/core/rtnetlink.c:3010 [inline] __rtnl_newlink net/core/rtnetlink.c:3168 [inline] rtnl_newlink+0x10fb/0x2010 net/core/rtnetlink.c:3289 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5262 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2509 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1347 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1943 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2287 ___sys_sendmsg net/socket.c:2341 [inline] __sys_sendmsg+0x28b/0x380 net/socket.c:2387 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 ffff8881e0a41000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881e0a41000, ffff8881e0a41800) The buggy address belongs to the page: page:ffffea0007829000 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5c0c000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) 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+0x2ce8/0x2d70 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+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x196/0x2b0 mm/slub.c:3909 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:690 [inline] ops_init+0x86/0x4a0 net/core/net_namespace.c:128 setup_net+0x214/0x990 net/core/net_namespace.c:345 copy_net_ns+0x30f/0x510 net/core/net_namespace.c:486 create_new_namespaces+0x47a/0x570 kernel/nsproxy.c:103 copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161 copy_process+0x12da/0x3230 kernel/fork.c:2047 _do_fork+0x197/0x900 kernel/fork.c:2396 __do_sys_clone kernel/fork.c:2554 [inline] __se_sys_clone kernel/fork.c:2535 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2535 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+0x83d/0x940 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 __slab_free+0x33e/0x350 mm/slub.c:3012 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1d0 mm/kasan/common.c:507 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+0xd0/0x220 mm/slub.c:2842 kmem_cache_zalloc include/linux/slab.h:680 [inline] locks_alloc_lock fs/locks.c:346 [inline] flock_make_lock fs/locks.c:487 [inline] __do_sys_flock fs/locks.c:2234 [inline] __se_sys_flock+0x15a/0x5a0 fs/locks.c:2215 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881e0a41380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e0a41400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e0a41480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e0a41500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e0a41580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.2 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=0 CPU: 1 PID: 18319 Comm: syz-executor.2 Tainted: G B 5.4.233-syzkaller-00019-gd5ed2ca98e48 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 dump_header+0xd5/0x670 mm/oom_kill.c:460 oom_kill_process+0xeb/0x2c0 mm/oom_kill.c:974 out_of_memory+0x5e1/0x890 mm/oom_kill.c:1111 mem_cgroup_out_of_memory+0x211/0x270 mm/memcontrol.c:1611 memory_max_write+0x331/0x3c0 mm/memcontrol.c:6227 cgroup_file_write+0x275/0x5c0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 memory: usage 14956kB, limit 0kB, failcnt 919 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: anon 4849664 file 10334208 kernel_stack 0 slab 0 sock 77824 shmem 10301440 file_mapped 135168 file_dirty 135168 file_writeback 0 anon_thp 0 inactive_anon 2162688 active_anon 13246464 inactive_file 135168 active_file 135168 unevictable 0 slab_reclaimable 0 slab_unreclaimable 0 pgfault 491898 pgmajfault 33 workingset_refault 0 workingset_activate 0 workingset_nodereclaim 0 pgrefill 169 pgscan 171 pgsteal 77 pgactivate 99 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz2,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz-executor.0,pid=18295,uid=0 Memory cgroup out of memory: Killed process 18295 (syz-executor.0) total-vm:186896kB, anon-rss:4564kB, file-rss:14336kB, shmem-rss:0kB, UID:0 pgtables:100kB oom_score_adj:1000 syz-executor.2 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=0 CPU: 1 PID: 18319 Comm: syz-executor.2 Tainted: G B 5.4.233-syzkaller-00019-gd5ed2ca98e48 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 dump_header+0xd5/0x670 mm/oom_kill.c:460 oom_kill_process+0xeb/0x2c0 mm/oom_kill.c:974 out_of_memory+0x5e1/0x890 mm/oom_kill.c:1111 mem_cgroup_out_of_memory+0x211/0x270 mm/memcontrol.c:1611 memory_max_write+0x331/0x3c0 mm/memcontrol.c:6227 cgroup_file_write+0x275/0x5c0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 memory: usage 10736kB, limit 0kB, failcnt 935 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: anon 557056 file 10334208 kernel_stack 0 slab 0 sock 77824 shmem 10301440 file_mapped 135168 file_dirty 135168 file_writeback 0 anon_thp 0 inactive_anon 2162688 active_anon 8921088 inactive_file 135168 active_file 135168 unevictable 0 slab_reclaimable 0 slab_unreclaimable 0 pgfault 491898 pgmajfault 33 workingset_refault 0 workingset_activate 0 workingset_nodereclaim 0 pgrefill 169 pgscan 171 pgsteal 77 pgactivate 99 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz2,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz-executor.0,pid=7699,uid=0 Memory cgroup out of memory: Killed process 7699 (syz-executor.0) total-vm:48516kB, anon-rss:472kB, file-rss:15316kB, shmem-rss:64kB, UID:0 pgtables:80kB oom_score_adj:0