================================================================== 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 ffff8881e3a20488 by task syz-executor.0/11571 CPU: 0 PID: 11571 Comm: syz-executor.0 Not tainted 5.4.265-syzkaller-00039-gc84a70203fff #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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 try_charge+0x50e/0x1510 mm/memcontrol.c:2616 mem_cgroup_try_charge+0x2bd/0x400 mm/memcontrol.c:6586 __add_to_page_cache_locked+0x23d/0xb10 mm/filemap.c:865 add_to_page_cache_lru+0x117/0x2c0 mm/filemap.c:962 pagecache_get_page+0x50a/0x750 mm/filemap.c:1840 grab_cache_page_write_begin+0x51/0x90 mm/filemap.c:3400 ext4_da_write_begin+0x58d/0xfe0 fs/ext4/inode.c:3144 generic_perform_write+0x2c7/0x560 mm/filemap.c:3450 __generic_file_write_iter+0x224/0x530 mm/filemap.c:3579 ext4_file_write_iter+0x499/0x10e0 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1983 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5d3/0x750 fs/read_write.c:496 __kernel_write+0x10f/0x350 fs/read_write.c:515 dump_emit+0x213/0x350 fs/coredump.c:838 elf_core_dump+0x3e1b/0x4740 fs/binfmt_elf.c:2352 do_coredump+0x20fb/0x2f00 fs/coredump.c:801 get_signal+0xd83/0x1440 kernel/signal.c:2729 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 ret_from_intr+0x1c/0x1c Allocated by task 10981: 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] pskb_expand_head+0x10c/0x10b0 net/core/skbuff.c:1647 netif_receive_generic_xdp net/core/dev.c:4281 [inline] do_xdp_generic+0x35e/0x1520 net/core/dev.c:4399 __netif_receive_skb_core+0x147f/0x37e0 net/core/dev.c:4790 __netif_receive_skb_one_core net/core/dev.c:4962 [inline] __netif_receive_skb+0x11c/0x530 net/core/dev.c:5078 process_backlog+0x34f/0x680 net/core/dev.c:5913 napi_poll net/core/dev.c:6359 [inline] net_rx_action+0x53f/0x1160 net/core/dev.c:6427 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 Freed by task 10981: 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 netif_receive_generic_xdp net/core/dev.c:4357 [inline] do_xdp_generic+0xd47/0x1520 net/core/dev.c:4399 __netif_receive_skb_core+0x147f/0x37e0 net/core/dev.c:4790 __netif_receive_skb_one_core net/core/dev.c:4962 [inline] __netif_receive_skb+0x11c/0x530 net/core/dev.c:5078 process_backlog+0x34f/0x680 net/core/dev.c:5913 napi_poll net/core/dev.c:6359 [inline] net_rx_action+0x53f/0x1160 net/core/dev.c:6427 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881e3a20000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881e3a20000, ffff8881e3a20800) The buggy address belongs to the page: page:ffffea00078e8800 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 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+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 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:2055 _do_fork+0x197/0x900 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538 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_zalloc include/linux/slab.h:680 [inline] __alloc_file+0x26/0x310 fs/file_table.c:101 alloc_empty_file+0x92/0x180 fs/file_table.c:151 path_openat+0x103/0x3480 fs/namei.c:3623 do_filp_open+0x20b/0x450 fs/namei.c:3664 do_sys_open+0x39c/0x810 fs/open.c:1113 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 Memory state around the buggy address: ffff8881e3a20380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e3a20400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e3a20480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e3a20500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e3a20580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================