================================================================== 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+0x6d8/0x750 mm/filemap.c:163 Read of size 4 at addr ffff888113744470 by task syz-executor.3/22035 CPU: 0 PID: 22035 Comm: syz-executor.3 Not tainted 5.15.141-syzkaller-00899-g28e3f5851a99 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __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+0x6d8/0x750 mm/filemap.c:163 __delete_from_page_cache+0xc6/0x5b0 mm/filemap.c:231 __remove_mapping+0x566/0x690 mm/vmscan.c:1200 shrink_page_list+0x2723/0x5c50 mm/vmscan.c:1797 shrink_inactive_list mm/vmscan.c:2304 [inline] shrink_list mm/vmscan.c:2549 [inline] shrink_lruvec+0x17ec/0x4580 mm/vmscan.c:5752 shrink_node_memcgs mm/vmscan.c:5944 [inline] shrink_node+0x1077/0x24e0 mm/vmscan.c:5974 shrink_zones mm/vmscan.c:6177 [inline] do_try_to_free_pages+0x5b6/0x1570 mm/vmscan.c:6235 try_to_free_mem_cgroup_pages+0x36c/0x850 mm/vmscan.c:6549 try_charge_memcg+0x48f/0x1550 mm/memcontrol.c:2686 try_charge mm/memcontrol.c:2811 [inline] charge_memcg+0x6b/0x1a0 mm/memcontrol.c:6814 __mem_cgroup_charge+0x37/0x130 mm/memcontrol.c:6850 mem_cgroup_charge include/linux/memcontrol.h:715 [inline] wp_page_copy+0x377/0x1b00 mm/memory.c:3207 do_wp_page+0x6fa/0xb60 handle_pte_fault+0x72e/0x2340 mm/memory.c:4858 do_handle_mm_fault+0x1fed/0x2330 mm/memory.c:5240 do_user_addr_fault arch/x86/mm/fault.c:1365 [inline] handle_page_fault arch/x86/mm/fault.c:1549 [inline] exc_page_fault+0x26f/0x830 arch/x86/mm/fault.c:1605 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0033:0x7f40ede5db80 Code: 89 1c 24 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 84 00 00 00 00 00 41 89 c5 e9 7f fe ff ff 0f 1f 84 00 00 00 00 00 <43> 89 2c 8e e9 a5 fe ff ff 0f 1f 80 00 00 00 00 48 39 c3 74 99 48 RSP: 002b:00007ffe634fe7e0 EFLAGS: 00010246 RAX: 0000000081b93611 RBX: 00007f40edfc1018 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000018151 RBP: 0000000081b93611 R08: 0000001b30720000 R09: 0000000000001611 R10: 0000000081b93615 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f40edfb5000 R15: ffffffff81b93f7b Allocated by task 32126: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 getname_flags+0xba/0x520 fs/namei.c:138 user_path_at_empty+0x2d/0x1a0 fs/namei.c:2852 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xfd/0x720 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0xc8/0x760 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 32126: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3519 [inline] kmem_cache_free+0x116/0x2e0 mm/slub.c:3535 putname fs/namei.c:270 [inline] user_path_at_empty+0x14e/0x1a0 fs/namei.c:2855 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xfd/0x720 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0xc8/0x760 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888113744400 which belongs to the cache names_cache of size 4096 The buggy address is located 112 bytes inside of 4096-byte region [ffff888113744400, ffff888113745400) The buggy address belongs to the page: page:ffffea00044dd000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113740 head:ffffea00044dd000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881001bfb00 raw: 0000000000000000 0000000000070007 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), pid 32126, ts 2673111336505, free_ts 2673036343276 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2604 prep_new_page+0x1b/0x110 mm/page_alloc.c:2610 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4484 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5776 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3253 getname_flags+0xba/0x520 fs/namei.c:138 user_path_at_empty+0x2d/0x1a0 fs/namei.c:2852 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xfd/0x720 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0xc8/0x760 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1471 [inline] free_pcp_prepare mm/page_alloc.c:1543 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3533 free_unref_page+0xe8/0x750 mm/page_alloc.c:3615 free_the_page mm/page_alloc.c:804 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5852 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3388 do_slab_free mm/slub.c:3507 [inline] ___cache_free+0x109/0x120 mm/slub.c:3526 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 kmem_cache_zalloc include/linux/slab.h:723 [inline] alloc_buffer_head+0x26/0x110 fs/buffer.c:3311 alloc_page_buffers+0x192/0x390 fs/buffer.c:832 Memory state around the buggy address: ffff888113744300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888113744380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888113744400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113744480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113744500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================