================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x99f/0xa80 mm/filemap.c:175 Read of size 4 at addr ffff8881218b9470 by task syz-executor.3/23041 CPU: 0 PID: 23041 Comm: syz-executor.3 Not tainted 5.10.178-syzkaller-00238-g8a30c9beebe8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] cleancache_invalidate_page include/linux/cleancache.h:110 [inline] unaccount_page_cache_page+0x99f/0xa80 mm/filemap.c:175 __delete_from_page_cache+0xd0/0x5d0 mm/filemap.c:243 __remove_mapping+0x567/0x690 mm/vmscan.c:978 shrink_page_list+0x1f38/0x4c60 mm/vmscan.c:1491 shrink_inactive_list+0x591/0x1150 mm/vmscan.c:2048 shrink_list mm/vmscan.c:2267 [inline] shrink_lruvec+0xced/0x3860 mm/vmscan.c:5408 shrink_node_memcgs mm/vmscan.c:5595 [inline] shrink_node+0xdf3/0x1fb0 mm/vmscan.c:5625 shrink_zones mm/vmscan.c:5828 [inline] do_try_to_free_pages+0x67e/0x15e0 mm/vmscan.c:5886 try_to_free_mem_cgroup_pages+0x369/0x830 mm/vmscan.c:6204 try_charge+0x4b8/0x15f0 mm/memcontrol.c:2742 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6847 mem_cgroup_charge include/linux/memcontrol.h:458 [inline] __add_to_page_cache_locked+0x29d/0xba0 mm/filemap.c:854 add_to_page_cache_lru+0x117/0x2c0 mm/filemap.c:948 pagecache_get_page+0x71e/0x950 mm/filemap.c:1859 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3456 ext4_da_write_begin+0x587/0xf60 fs/ext4/inode.c:3065 generic_perform_write+0x2cd/0x570 mm/filemap.c:3506 ext4_buffered_write_iter+0x47d/0x610 fs/ext4/file.c:272 ext4_file_write_iter+0x193/0x1ca0 fs/ext4/file.c:689 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550 dump_emit+0x261/0x3a0 fs/coredump.c:849 dump_user_range+0x71/0x1a0 fs/coredump.c:902 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2287 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811 get_signal+0x102c/0x1410 kernel/signal.c:2768 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] irqentry_exit_to_user_mode+0x55/0x80 kernel/entry/common.c:287 irqentry_exit+0x12/0x60 kernel/entry/common.c:375 exc_general_protection+0x415/0x490 arch/x86/kernel/traps.c:557 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 RIP: 0033:0x7f0e4d468391 Code: c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000020000330 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f0e4d588120 RCX: 00007f0e4d468389 RDX: 0000000020000340 RSI: 0000000020000330 RDI: 0000000080000000 RBP: 00007f0e4d4b3493 R08: 0000000020000480 R09: 0000000020000480 R10: 0000000020000380 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffcabfcb40f R14: 00007f0e4c199300 R15: 0000000000022000 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff8881218b8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 5232 bytes inside of 8192-byte region [ffff8881218b8000, ffff8881218ba000) The buggy address belongs to the page: page:ffffea0004862e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881218bc000 pfn:0x1218b8 head:ffffea0004862e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea0005c0b608 ffff888100040990 ffff888100042a80 raw: ffff8881218bc000 0000000000020000 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 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 21992, ts 768895232342, free_ts 768854977723 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2455 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2461 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4253 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5345 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:143 [inline] __alloc_skb+0xbc/0x510 net/core/skbuff.c:211 alloc_skb include/linux/skbuff.h:1125 [inline] netlink_dump+0x1eb/0xd10 net/netlink/af_netlink.c:2266 netlink_recvmsg+0x69d/0x1160 net/netlink/af_netlink.c:2026 ____sys_recvmsg+0x286/0x530 ___sys_recvmsg+0x1ec/0x690 net/socket.c:2618 do_recvmmsg+0x407/0x920 net/socket.c:2712 __sys_recvmmsg net/socket.c:2791 [inline] __do_sys_recvmmsg net/socket.c:2814 [inline] __se_sys_recvmmsg net/socket.c:2807 [inline] __x64_sys_recvmmsg+0x195/0x240 net/socket.c:2807 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1628 free_the_page+0x76/0x370 mm/page_alloc.c:5406 __free_pages+0x67/0xc0 mm/page_alloc.c:5415 __free_slab+0xcf/0x190 mm/slub.c:1894 free_slab mm/slub.c:1909 [inline] discard_slab mm/slub.c:1915 [inline] unfreeze_partials+0x15e/0x190 mm/slub.c:2410 put_cpu_partial+0xbf/0x180 mm/slub.c:2446 __slab_free+0x2c8/0x3a0 mm/slub.c:3095 do_slab_free mm/slub.c:3191 [inline] ___cache_free+0x111/0x130 mm/slub.c:3210 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960 getname_flags+0xba/0x520 fs/namei.c:141 user_path_at_empty+0x2d/0x50 fs/namei.c:2740 Memory state around the buggy address: ffff8881218b9300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881218b9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881218b9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881218b9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881218b9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================