syz.2.223: attempt to access beyond end of device loop2: rw=524288, sector=8, nr_sectors = 16 limit=16 syz.2.223: attempt to access beyond end of device loop2: rw=524288, sector=16, nr_sectors = 40 limit=16 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_to_page include/linux/highmem.h:427 [inline] BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x38c/0x460 fs/erofs/decompressor.c:346 Read of size 4096 at addr ffff88803122d000 by task syz.2.223/6410 CPU: 1 PID: 6410 Comm: syz.2.223 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x241/0x290 mm/kasan/generic.c:187 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 memcpy_to_page include/linux/highmem.h:427 [inline] z_erofs_transform_plain+0x38c/0x460 fs/erofs/decompressor.c:346 z_erofs_decompress_pcluster fs/erofs/zdata.c:1296 [inline] z_erofs_decompress_queue+0x1780/0x26f0 fs/erofs/zdata.c:1377 z_erofs_runqueue+0x1a4e/0x1bf0 fs/erofs/zdata.c:1778 z_erofs_read_folio+0x323/0x5c0 fs/erofs/zdata.c:1863 filemap_read_folio+0x172/0x760 mm/filemap.c:2420 filemap_update_page mm/filemap.c:2504 [inline] filemap_get_pages+0x13c7/0x1e90 mm/filemap.c:2618 filemap_read+0x402/0xf00 mm/filemap.c:2690 __kernel_read+0x2f3/0x710 fs/read_write.c:428 integrity_kernel_read+0x8a/0xd0 security/integrity/iint.c:221 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x91d/0x1910 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x4d4/0xa20 security/integrity/ima/ima_api.c:290 process_measurement+0x128e/0x1d70 security/integrity/ima/ima_main.c:370 ima_file_check+0xcc/0x110 security/integrity/ima/ima_main.c:568 do_open fs/namei.c:3642 [inline] path_openat+0x28b7/0x3230 fs/namei.c:3797 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_sys_openat2+0x134/0x1d0 fs/open.c:1421 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1447 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fbb8b19c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbb8bf76028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbb8b416180 RCX: 00007fbb8b19c819 RDX: 0000000000080000 RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007fbb8b232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbb8b416218 R14: 00007fbb8b416180 R15: 00007ffe29d650f8 Allocated by task 5121: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519 kmem_cache_zalloc include/linux/slab.h:711 [inline] lsm_file_alloc security/security.c:613 [inline] security_file_alloc+0x34/0x120 security/security.c:2604 init_file+0x94/0x1f0 fs/file_table.c:161 alloc_empty_file+0xb7/0x1d0 fs/file_table.c:210 path_openat+0x113/0x3230 fs/namei.c:3783 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_open_execat+0x14c/0x410 fs/exec.c:924 open_exec+0x40/0x60 fs/exec.c:955 load_elf_binary+0x19e8/0x2860 fs/binfmt_elf.c:924 search_binary_handler fs/exec.c:1775 [inline] exec_binprm fs/exec.c:1817 [inline] bprm_execve+0xb08/0x1700 fs/exec.c:1892 do_execveat_common+0x51b/0x6c0 fs/exec.c:1998 do_execve fs/exec.c:2072 [inline] __do_sys_execve fs/exec.c:2148 [inline] __se_sys_execve fs/exec.c:2143 [inline] __x64_sys_execve+0x92/0xa0 fs/exec.c:2143 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88803122d000 which belongs to the cache lsm_file_cache of size 88 The buggy address is located 0 bytes inside of allocated 88-byte region [ffff88803122d000, ffff88803122d058) The buggy address belongs to the physical page: page:ffffea0000c48b40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3122d anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888019e4d280 ffffea00009783c0 dead000000000005 raw: 0000000000000000 0000000000220022 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5121, tgid 5121 (start-stop-daem), ts 29174644937, free_ts 27865598142 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581 prep_new_page mm/page_alloc.c:1588 [inline] get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500 alloc_slab_page+0x5d/0x160 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x1b3/0x2d0 mm/slub.c:3519 kmem_cache_zalloc include/linux/slab.h:711 [inline] lsm_file_alloc security/security.c:613 [inline] security_file_alloc+0x34/0x120 security/security.c:2604 init_file+0x94/0x1f0 fs/file_table.c:161 alloc_empty_file+0xb7/0x1d0 fs/file_table.c:210 path_openat+0x113/0x3230 fs/namei.c:3783 do_filp_open+0x1f5/0x430 fs/namei.c:3824 do_open_execat+0x14c/0x410 fs/exec.c:924 open_exec+0x40/0x60 fs/exec.c:955 load_elf_binary+0x19e8/0x2860 fs/binfmt_elf.c:924 search_binary_handler fs/exec.c:1775 [inline] exec_binprm fs/exec.c:1817 [inline] bprm_execve+0xb08/0x1700 fs/exec.c:1892 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1181 [inline] free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458 kasan_depopulate_vmalloc_pte+0x75/0x90 mm/kasan/shadow.c:427 apply_to_pte_range mm/memory.c:2604 [inline] apply_to_pmd_range mm/memory.c:2648 [inline] apply_to_pud_range mm/memory.c:2684 [inline] apply_to_p4d_range mm/memory.c:2720 [inline] __apply_to_page_range+0x860/0xdd0 mm/memory.c:2756 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:544 __purge_vmap_area_lazy+0xfa7/0x1af0 mm/vmalloc.c:1778 _vm_unmap_aliases+0x743/0x7e0 mm/vmalloc.c:2331 change_page_attr_set_clr+0x337/0x9f0 arch/x86/mm/pat/set_memory.c:1878 change_page_attr_set arch/x86/mm/pat/set_memory.c:1919 [inline] set_memory_nx+0xd7/0x110 arch/x86/mm/pat/set_memory.c:2112 free_init_pages arch/x86/mm/init.c:933 [inline] free_kernel_image_pages arch/x86/mm/init.c:952 [inline] free_initmem+0x92/0xd0 arch/x86/mm/init.c:979 kernel_init+0x31/0x1c0 init/main.c:1464 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Memory state around the buggy address: ffff88803122cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803122cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88803122d000: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fa ^ ffff88803122d080: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ffff88803122d100: fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb ==================================================================