================================================================== 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+0x6e6/0x750 mm/filemap.c:169 Read of size 4 at addr ffff8881baf62488 by task syz-executor.1/24998 CPU: 0 PID: 24998 Comm: syz-executor.1 Tainted: G W 5.4.233-syzkaller-00007-ge7141bb18b62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023 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+0x6e6/0x750 mm/filemap.c:169 __delete_from_page_cache+0xd0/0x600 mm/filemap.c:237 __remove_mapping+0x4a2/0x590 mm/vmscan.c:978 shrink_page_list+0x22f9/0x42c0 mm/vmscan.c:1482 shrink_inactive_list+0x533/0xfe0 mm/vmscan.c:2001 shrink_list mm/vmscan.c:2293 [inline] shrink_node_memcg+0xc42/0x2430 mm/vmscan.c:2623 shrink_node+0x389/0x14a0 mm/vmscan.c:2836 shrink_zones mm/vmscan.c:3053 [inline] do_try_to_free_pages+0x63f/0x12b0 mm/vmscan.c:3111 try_to_free_mem_cgroup_pages+0x3f6/0x9b0 mm/vmscan.c:3412 memory_max_write+0x23a/0x440 mm/memcontrol.c:6220 cgroup_file_write+0x275/0x5f0 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 24546: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 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+0x100/0x2b0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xb4/0x4d0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1079 [inline] __ip_append_data+0x23fc/0x3650 net/ipv4/ip_output.c:1111 ip_append_data+0x12c/0x1a0 net/ipv4/ip_output.c:1330 raw_sendmsg+0x1268/0x1dd0 net/ipv4/raw.c:666 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_sendmmsg+0x3c3/0x700 net/socket.c:2444 __do_sys_sendmmsg net/socket.c:2473 [inline] __se_sys_sendmmsg net/socket.c:2470 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2470 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 24546: 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+0x1b5/0x270 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+0x123/0x370 mm/slub.c:4071 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb net/core/skbuff.c:689 [inline] kfree_skb+0xb8/0x3c0 net/core/skbuff.c:708 kfree_skb_list+0x3d/0x60 net/core/skbuff.c:717 __dev_xmit_skb net/core/dev.c:3455 [inline] __dev_queue_xmit+0x18a1/0x27e0 net/core/dev.c:3756 neigh_hh_output include/net/neighbour.h:509 [inline] neigh_output include/net/neighbour.h:523 [inline] ip_finish_output2+0xb4f/0xfc0 net/ipv4/ip_output.c:236 NF_HOOK_COND include/linux/netfilter.h:297 [inline] ip_output+0x19b/0x3a0 net/ipv4/ip_output.c:440 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb net/ipv4/ip_output.c:1575 [inline] ip_push_pending_frames+0xf3/0x180 net/ipv4/ip_output.c:1595 raw_sendmsg+0x12d7/0x1dd0 net/ipv4/raw.c:672 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_sendmmsg+0x3c3/0x700 net/socket.c:2444 __do_sys_sendmmsg net/socket.c:2473 [inline] __se_sys_sendmmsg net/socket.c:2470 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2470 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 ffff8881baf62400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 136 bytes inside of 512-byte region [ffff8881baf62400, ffff8881baf62600) The buggy address belongs to the page: page:ffffea0006ebd800 refcount:1 mapcount:0 mapping:ffff8881f5c02500 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, 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+0x2d13/0x2d90 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+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x16d/0x2b0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xb4/0x4d0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1079 [inline] __ip_append_data+0x23fc/0x3650 net/ipv4/ip_output.c:1111 ip_append_data+0x12c/0x1a0 net/ipv4/ip_output.c:1330 raw_sendmsg+0x1268/0x1dd0 net/ipv4/raw.c:666 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_sendmmsg+0x3c3/0x700 net/socket.c:2444 __do_sys_sendmmsg net/socket.c:2473 [inline] __se_sys_sendmmsg net/socket.c:2470 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2470 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 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:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 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+0xd9/0x250 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x7a/0x4d0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1079 [inline] __ip_append_data+0x23fc/0x3650 net/ipv4/ip_output.c:1111 ip_append_data+0x12c/0x1a0 net/ipv4/ip_output.c:1330 raw_sendmsg+0x1268/0x1dd0 net/ipv4/raw.c:666 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_sendmmsg+0x3c3/0x700 net/socket.c:2444 Memory state around the buggy address: ffff8881baf62380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881baf62400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881baf62480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881baf62500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881baf62580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.1 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 0 PID: 24998 Comm: syz-executor.1 Tainted: G B W 5.4.233-syzkaller-00007-ge7141bb18b62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 dump_header+0xd5/0x6b0 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+0x329/0x440 mm/memcontrol.c:6227 cgroup_file_write+0x275/0x5f0 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 35496kB, limit 0kB, failcnt 12212 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: anon 14200832 file 22110208 kernel_stack 0 slab 0 sock 0 shmem 22163456 file_mapped 135168 file_dirty 0 file_writeback 0 anon_thp 0 inactive_anon 135168 active_anon 36392960 inactive_file 126976 active_file 118784 unevictable 135168 slab_reclaimable 0 slab_unreclaimable 0 pgfault 1129095 pgmajfault 0 workingset_refault 0 workingset_activate 0 workingset_nodereclaim 0 pgrefill 9129 pgscan 16837 pgsteal 3948 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz1,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor.1,pid=19600,uid=0 Memory cgroup out of memory: Killed process 19600 (syz-executor.1) total-vm:54668kB, anon-rss:4616kB, file-rss:14336kB, shmem-rss:0kB, UID:0 pgtables:88kB oom_score_adj:1000