loop0: detected capacity change from 0 to 64 overlay: filesystem on ./bus not supported ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline] BUG: KASAN: slab-out-of-bounds in hfs_bnode_read fs/hfs/bnode.c:35 [inline] BUG: KASAN: slab-out-of-bounds in hfs_bnode_read_key+0x314/0x450 fs/hfs/bnode.c:70 Write of size 94 at addr ffff88803f926280 by task syz.0.0/5112 CPU: 0 UID: 0 PID: 5112 Comm: syz.0.0 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 memcpy_from_page include/linux/highmem.h:423 [inline] hfs_bnode_read fs/hfs/bnode.c:35 [inline] hfs_bnode_read_key+0x314/0x450 fs/hfs/bnode.c:70 hfs_brec_insert+0x7f3/0xbd0 fs/hfs/brec.c:159 hfs_cat_create+0x41d/0xa50 fs/hfs/catalog.c:118 hfs_create+0x66/0xe0 fs/hfs/dir.c:202 vfs_create+0x23c/0x3d0 fs/namei.c:3294 do_mknodat+0x447/0x5b0 fs/namei.c:4185 __do_sys_mknodat fs/namei.c:4213 [inline] __se_sys_mknodat fs/namei.c:4210 [inline] __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4210 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f07d277dff9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f07d34a3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000103 RAX: ffffffffffffffda RBX: 00007f07d2935f80 RCX: 00007f07d277dff9 RDX: 0000000000000000 RSI: 0000000020001600 RDI: 0000000000000004 RBP: 00007f07d27f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f07d2935f80 R15: 00007fff6af059a8 Allocated by task 5112: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4265 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] hfs_find_init+0x90/0x1f0 fs/hfs/bfind.c:21 hfs_cat_create+0x182/0xa50 fs/hfs/catalog.c:96 hfs_create+0x66/0xe0 fs/hfs/dir.c:202 vfs_create+0x23c/0x3d0 fs/namei.c:3294 do_mknodat+0x447/0x5b0 fs/namei.c:4185 __do_sys_mknodat fs/namei.c:4213 [inline] __se_sys_mknodat fs/namei.c:4210 [inline] __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4210 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803f926280 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of allocated 78-byte region [ffff88803f926280, ffff88803f9262ce) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3f926 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff88801ac41280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080200020 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5112, tgid 5111 (syz.0.0), ts 73791627531, free_ts 73642082058 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2413 allocate_slab+0x5a/0x2f0 mm/slub.c:2579 new_slab mm/slub.c:2632 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819 __slab_alloc+0x58/0xa0 mm/slub.c:3909 __slab_alloc_node mm/slub.c:3962 [inline] slab_alloc_node mm/slub.c:4123 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x25a/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] hfs_find_init+0x90/0x1f0 fs/hfs/bfind.c:21 hfs_lookup+0x12c/0x2f0 fs/hfs/dir.c:28 lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633 filename_create+0x297/0x540 fs/namei.c:4027 do_mkdirat+0xbd/0x3a0 fs/namei.c:4272 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 page last free pid 5112 tgid 5111 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 tlb_batch_list_free mm/mmu_gather.c:159 [inline] tlb_finish_mmu+0x11f/0x200 mm/mmu_gather.c:468 vms_clear_ptes+0x437/0x530 mm/vma.c:1096 vms_complete_munmap_vmas+0x208/0x910 mm/vma.c:1140 do_vmi_align_munmap+0x613/0x730 mm/vma.c:1349 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1397 __vm_munmap+0x24c/0x480 mm/mmap.c:1600 __do_sys_munmap mm/mmap.c:1617 [inline] __se_sys_munmap mm/mmap.c:1614 [inline] __x64_sys_munmap+0x68/0x80 mm/mmap.c:1614 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803f926180: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88803f926200: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88803f926280: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc ^ ffff88803f926300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803f926380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================