================================================================== 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 ffff8881ed18f488 by task syz-executor.0/8665 CPU: 1 PID: 8665 Comm: syz-executor.0 Tainted: G W 5.4.242-syzkaller-00065-g10e0626a3202 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 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_high_write+0x176/0x260 mm/memcontrol.c:6177 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 492: 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 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:759 [inline] kvmalloc_array include/linux/mm.h:777 [inline] alloc_fdtable+0xcb/0x240 fs/file.c:115 dup_fd+0x718/0xaa0 fs/file.c:310 copy_files+0xe1/0x1f0 kernel/fork.c:1477 copy_process+0x11e3/0x3230 kernel/fork.c:2032 _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 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 8064: 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 __free_fdtable fs/file.c:31 [inline] put_files_struct+0x291/0x330 fs/file.c:420 do_exit+0xc78/0x2bc0 kernel/exit.c:854 do_group_exit+0x138/0x300 kernel/exit.c:982 get_signal+0xdb1/0x1440 kernel/signal.c:2735 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881ed18f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881ed18f000, ffff8881ed18f800) The buggy address belongs to the page: page:ffffea0007b46200 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881ed18a000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea00077ef008 ffffea0006a47008 ffff8881f5c0c000 raw: ffff8881ed18a000 0000000000080002 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+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+0x19b/0x2e0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:759 [inline] xt_alloc_table_info+0x39/0xa0 net/netfilter/x_tables.c:1172 do_replace net/ipv6/netfilter/ip6_tables.c:1143 [inline] do_ip6t_set_ctl+0x299/0x600 net/ipv6/netfilter/ip6_tables.c:1684 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x28f/0x2b0 net/netfilter/nf_sockopt.c:115 __sys_setsockopt+0x4b4/0x840 net/socket.c:2074 __do_sys_setsockopt net/socket.c:2090 [inline] __se_sys_setsockopt net/socket.c:2087 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2087 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 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_thread_stack kernel/fork.c:299 [inline] release_task_stack kernel/fork.c:439 [inline] put_task_stack+0x212/0x260 kernel/fork.c:450 finish_task_switch+0x24a/0x590 kernel/sched/core.c:3479 context_switch kernel/sched/core.c:3611 [inline] __schedule+0xb0d/0x1320 kernel/sched/core.c:4307 schedule+0x12c/0x1d0 kernel/sched/core.c:4375 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4434 __mutex_lock_common kernel/locking/mutex.c:1050 [inline] __mutex_lock+0x7e5/0x1060 kernel/locking/mutex.c:1114 mutex_lock_killable+0xd8/0x110 kernel/locking/mutex.c:1348 lo_open+0x18/0xc0 drivers/block/loop.c:1899 __blkdev_get+0x3c8/0x1160 fs/block_dev.c:1581 blkdev_get+0x2de/0x3a0 fs/block_dev.c:1714 do_dentry_open+0x961/0x1120 fs/open.c:796 do_last fs/namei.c:3495 [inline] path_openat+0x2992/0x3480 fs/namei.c:3614 do_filp_open+0x20b/0x450 fs/namei.c:3644 do_sys_open+0x39c/0x810 fs/open.c:1113 Memory state around the buggy address: ffff8881ed18f380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ed18f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881ed18f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ed18f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ed18f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================