syz.0.55: attempt to access beyond end of device loop0: rw=524288, sector=8, nr_sectors = 16 limit=16 syz.0.55: attempt to access beyond end of device loop0: rw=524288, sector=16, nr_sectors = 40 limit=16 ================================================================== BUG: KASAN: slab-use-after-free in memcpy_to_page include/linux/highmem.h:427 [inline] BUG: KASAN: slab-use-after-free in z_erofs_transform_plain+0x38c/0x460 fs/erofs/decompressor.c:346 Read of size 4096 at addr ffff8880754d9000 by task syz.0.55/6029 CPU: 1 PID: 6029 Comm: syz.0.55 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: 0033:0x7fd8bb39c819 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:00007fd8bc2be028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fd8bb615fa0 RCX: 00007fd8bb39c819 RDX: 0000000000080000 RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007fd8bb432c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd8bb616038 R14: 00007fd8bb615fa0 R15: 00007fff7491e568 Allocated by task 5957: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] push_stack+0x90/0x500 kernel/bpf/verifier.c:2050 sanitize_speculative_path+0x2b/0x1e0 kernel/bpf/verifier.c:12268 check_cond_jmp_op+0xbb2/0x2680 kernel/bpf/verifier.c:14616 do_check+0x6746/0xdbf0 kernel/bpf/verifier.c:17366 do_check_common+0xadb/0x13e0 kernel/bpf/verifier.c:19712 do_check_main kernel/bpf/verifier.c:19775 [inline] bpf_check+0x658e/0xeba0 kernel/bpf/verifier.c:20443 bpf_prog_load+0x1163/0x1670 kernel/bpf/syscall.c:2753 __sys_bpf+0x5ba/0x890 kernel/bpf/syscall.c:5477 __do_sys_bpf kernel/bpf/syscall.c:5581 [inline] __se_sys_bpf kernel/bpf/syscall.c:5579 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579 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 Freed by task 5957: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843 pop_stack kernel/bpf/verifier.c:2036 [inline] do_check_common+0xbf5/0x13e0 kernel/bpf/verifier.c:19721 do_check_main kernel/bpf/verifier.c:19775 [inline] bpf_check+0x658e/0xeba0 kernel/bpf/verifier.c:20443 bpf_prog_load+0x1163/0x1670 kernel/bpf/syscall.c:2753 __sys_bpf+0x5ba/0x890 kernel/bpf/syscall.c:5477 __do_sys_bpf kernel/bpf/syscall.c:5581 [inline] __se_sys_bpf kernel/bpf/syscall.c:5579 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579 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 ffff8880754d9000 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of freed 192-byte region [ffff8880754d9000, ffff8880754d90c0) The buggy address belongs to the physical page: page:ffffea0001d53640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x754d9 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c41a00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 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 5957, tgid 5955 (syz.2.38), ts 99840159993, free_ts 94018298401 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] __kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] push_stack+0x90/0x500 kernel/bpf/verifier.c:2050 sanitize_speculative_path+0x2b/0x1e0 kernel/bpf/verifier.c:12268 check_cond_jmp_op+0xbb2/0x2680 kernel/bpf/verifier.c:14616 do_check+0x6746/0xdbf0 kernel/bpf/verifier.c:17366 do_check_common+0xadb/0x13e0 kernel/bpf/verifier.c:19712 do_check_main kernel/bpf/verifier.c:19775 [inline] bpf_check+0x658e/0xeba0 kernel/bpf/verifier.c:20443 bpf_prog_load+0x1163/0x1670 kernel/bpf/syscall.c:2753 __sys_bpf+0x5ba/0x890 kernel/bpf/syscall.c:5477 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 __slab_free+0x35a/0x400 mm/slub.c:3736 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 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] __kmem_cache_alloc_node+0x13a/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa4/0x230 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x282/0x560 security/tomoyo/file.c:822 security_inode_getattr+0xd3/0x120 security/security.c:2154 vfs_getattr fs/stat.c:173 [inline] vfs_fstat fs/stat.c:198 [inline] __do_sys_newfstat fs/stat.c:473 [inline] __se_sys_newfstat fs/stat.c:470 [inline] __x64_sys_newfstat+0x12c/0x250 fs/stat.c:470 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 Memory state around the buggy address: ffff8880754d8f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880754d8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880754d9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880754d9080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880754d9100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================