================================================================== BUG: KASAN: slab-out-of-bounds in md5_block+0x95/0x8d0 lib/crypto/md5.c:40 Read of size 64 at addr ffff888036eb58e0 by task syz.1.18/5921 CPU: 1 UID: 0 PID: 5921 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0x1 __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:186 [inline] kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105 md5_block+0x95/0x8d0 lib/crypto/md5.c:40 md5_blocks lib/crypto/md5.c:126 [inline] md5_update+0xf7/0x210 lib/crypto/md5.c:161 md5+0xc7/0x120 lib/crypto/md5.c:202 ecryptfs_write_tag_70_packet+0x880/0x1410 fs/ecryptfs/keystore.c:741 ecryptfs_encrypt_filename fs/ecryptfs/crypto.c:1378 [inline] ecryptfs_encrypt_and_encode_filename+0x428/0xa60 fs/ecryptfs/crypto.c:1789 ecryptfs_lookup+0x1f7/0x830 fs/ecryptfs/inode.c:402 lookup_one_qstr_excl+0x1cd/0x250 fs/namei.c:1810 __start_dirop fs/namei.c:2920 [inline] start_dirop fs/namei.c:2942 [inline] filename_create+0x1cf/0x400 fs/namei.c:5092 filename_mkdirat+0xb9/0x5e0 fs/namei.c:5436 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat fs/namei.c:5461 [inline] __x64_sys_mkdirat+0x89/0xc0 fs/namei.c:5461 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f10c439e159 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:00007f10c52de028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f10c4625fa0 RCX: 00007f10c439e159 RDX: 343806076c12c449 RSI: 0000200000000240 RDI: 0000000000000004 RBP: 00007f10c443506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f10c4626038 R14: 00007f10c4625fa0 R15: 00007ffdfb8c0538 Allocated by task 5921: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kmalloc_flags_noprof+0x370/0x8e0 mm/slub.c:5602 _kmalloc_flags_noprof mm/slab.h:55 [inline] __alloc_empty_sheaf mm/slub.c:2822 [inline] alloc_empty_sheaf mm/slub.c:2842 [inline] __pcs_replace_empty_main+0x3fa/0x650 mm/slub.c:4769 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] kmem_cache_alloc_noprof+0x4c4/0x6a0 mm/slub.c:5010 key_alloc+0x3c5/0x1310 security/keys/key.c:277 keyring_alloc+0x44/0xc0 security/keys/keyring.c:528 install_session_keyring_to_cred+0x190/0x230 security/keys/process_keys.c:330 join_session_keyring+0x1bc/0x350 security/keys/process_keys.c:851 lookup_user_key+0xbf9/0x1300 security/keys/process_keys.c:674 __do_sys_add_key+0x2a6/0x460 security/keys/keyctl.c:126 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888036eb5800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 224 bytes inside of allocated 256-byte region [ffff888036eb5800, ffff888036eb5900) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36eb4 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801c042b40 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801c042b40 dead000000000122 0000000000000000 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5907, tgid 5907 (syz-executor), ts 50898554976 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0x67c/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] _kmalloc_array_noprof include/linux/slab.h:1211 [inline] security_inode_init_security+0x113/0x370 security/security.c:1347 shmem_symlink+0x163/0xbf0 mm/shmem.c:4071 vfs_symlink fs/namei.c:5794 [inline] vfs_symlink+0x178/0x4d0 fs/namei.c:5773 filename_symlinkat+0x2a6/0x560 fs/namei.c:5819 __do_sys_symlinkat fs/namei.c:5839 [inline] __se_sys_symlinkat fs/namei.c:5834 [inline] __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5834 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5729 tgid 5729 ts 50867300565 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5010 alloc_filename fs/namei.c:147 [inline] do_getname+0x35/0x390 fs/namei.c:187 getname_flags fs/namei.c:230 [inline] getname include/linux/fs.h:2557 [inline] class_filename_constructor include/linux/fs.h:2584 [inline] __do_sys_mkdirat fs/namei.c:5463 [inline] __se_sys_mkdirat fs/namei.c:5461 [inline] __x64_sys_mkdirat+0x78/0xc0 fs/namei.c:5461 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888036eb5800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888036eb5880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888036eb5900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888036eb5980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888036eb5a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================