================================================================== 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 ffff8881af54f488 by task syz-executor.5/31695 CPU: 1 PID: 31695 Comm: syz-executor.5 Not tainted 5.4.233-syzkaller-00032-g21086923c1e6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 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 30712: 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 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xbd/0x3e0 net/core/sock.c:1618 sk_alloc+0x30/0x3a0 net/core/sock.c:1676 __netlink_create net/netlink/af_netlink.c:638 [inline] netlink_create+0x3e3/0x630 net/netlink/af_netlink.c:701 __sock_create+0x3cb/0x7a0 net/socket.c:1408 sock_create net/socket.c:1459 [inline] __sys_socket+0x132/0x370 net/socket.c:1501 __do_sys_socket net/socket.c:1510 [inline] __se_sys_socket net/socket.c:1508 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1508 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 27013: 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 sk_prot_free net/core/sock.c:1659 [inline] __sk_destruct+0x5b7/0x5e0 net/core/sock.c:1745 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167 rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387 __do_softirq+0x22e/0x630 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881af54f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881af54f000, ffff8881af54f800) The buggy address belongs to the page: page:ffffea0006bd5200 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881af54a000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea00078be408 ffffea0007853008 ffff8881f5c0c000 raw: ffff8881af54a000 0000000000080005 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) 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_track_caller+0x168/0x290 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 rtnl_configure_link net/core/rtnetlink.c:2915 [inline] __rtnl_newlink net/core/rtnetlink.c:3249 [inline] rtnl_newlink+0x19e2/0x2010 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 page_owner free stack trace missing Memory state around the buggy address: ffff8881af54f380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881af54f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881af54f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881af54f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881af54f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.5 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 1 PID: 31695 Comm: syz-executor.5 Tainted: G B 5.4.233-syzkaller-00032-g21086923c1e6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 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 8816kB, limit 0kB, failcnt 8 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: anon 114688 file 9027584 kernel_stack 0 slab 0 sock 102400 shmem 8577024 file_mapped 270336 file_dirty 0 file_writeback 0 anon_thp 0 inactive_anon 8245248 active_anon 270336 inactive_file 12288 active_file 430080 unevictable 0 slab_reclaimable 0 slab_unreclaimable 0 pgfault 3860505 pgmajfault 0 workingset_refault 0 workingset_activate 0 workingset_nodereclaim 0 pgrefill 1914 pgscan 1983 pgsteal 152 pgactivate 1782 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz5,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor.1,pid=311,uid=0 Memory cgroup out of memory: Killed process 311 (syz-executor.1) total-vm:48516kB, anon-rss:472kB, file-rss:15180kB, shmem-rss:4kB, UID:0 pgtables:88kB oom_score_adj:0