================================================================== BUG: KASAN: slab-out-of-bounds in dbgfs_rm_context mm/damon/dbgfs.c:928 [inline] BUG: KASAN: slab-out-of-bounds in dbgfs_rm_context_write+0x303/0x4b0 mm/damon/dbgfs.c:971 Write of size 8 at addr ffff8880213bb1a8 by task syz-executor.1/18285 CPU: 1 PID: 18285 Comm: syz-executor.1 Not tainted 6.1.0-rc2-syzkaller-00070-g4dc12f37a8e9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 dbgfs_rm_context mm/damon/dbgfs.c:928 [inline] dbgfs_rm_context_write+0x303/0x4b0 mm/damon/dbgfs.c:971 full_proxy_write+0x10c/0x1c0 fs/debugfs/file.c:236 vfs_write+0x303/0xc50 fs/read_write.c:582 ksys_write+0x177/0x2a0 fs/read_write.c:637 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+0x63/0xcd RIP: 0033:0x7f936ce8b5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f936dcc7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f936cfabf80 RCX: 00007f936ce8b5a9 RDX: 000000000000fe6c RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007f936cee67b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe5189c96f R14: 00007f936dcc7300 R15: 0000000000022000 Allocated by task 18285: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xaf/0x1a0 mm/slab_common.c:968 kmalloc_array include/linux/slab.h:628 [inline] dbgfs_rm_context mm/damon/dbgfs.c:908 [inline] dbgfs_rm_context_write+0x22e/0x4b0 mm/damon/dbgfs.c:971 full_proxy_write+0x10c/0x1c0 fs/debugfs/file.c:236 vfs_write+0x303/0xc50 fs/read_write.c:582 ksys_write+0x177/0x2a0 fs/read_write.c:637 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+0x63/0xcd The buggy address belongs to the object at ffff8880213bb180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 40 bytes inside of 64-byte region [ffff8880213bb180, ffff8880213bb1c0) The buggy address belongs to the physical page: page:ffffea000084eec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x213bb flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00004bb100 dead000000000002 ffff888012041640 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 8419, tgid 8419 (syz-executor.1), ts 1692172114092, free_ts 1692161303154 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4287 __alloc_pages+0x259/0x560 mm/page_alloc.c:5554 alloc_slab_page+0x70/0xf0 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc+0x9e/0x1a0 mm/slab_common.c:968 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:712 [inline] lsm_task_alloc security/security.c:617 [inline] security_task_alloc+0x3f/0x140 security/security.c:1657 copy_process+0x17e5/0x4000 kernel/fork.c:2235 kernel_clone+0x21b/0x620 kernel/fork.c:2671 __do_sys_clone kernel/fork.c:2812 [inline] __se_sys_clone kernel/fork.c:2796 [inline] __x64_sys_clone+0x228/0x290 kernel/fork.c:2796 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+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3528 release_pages+0x232a/0x25c0 mm/swap.c:1055 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:256 [inline] tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:263 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:363 exit_mmap+0x275/0x630 mm/mmap.c:3098 __mmput+0x114/0x3b0 kernel/fork.c:1185 exit_mm+0x1f5/0x2d0 kernel/exit.c:516 do_exit+0x5e7/0x2070 kernel/exit.c:807 do_group_exit+0x1fd/0x2b0 kernel/exit.c:950 get_signal+0x16ec/0x17b0 kernel/signal.c:2858 arch_do_signal_or_restart+0x7b/0x730 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x74/0x150 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff8880213bb080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880213bb100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880213bb180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880213bb200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880213bb280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================