================================================================== BUG: KASAN: slab-out-of-bounds in ecryptfs_verify_auth_tok_from_key+0x3b7/0x400 fs/ecryptfs/keystore.c:465 Read of size 2 at addr ffff88802c771998 by task syz.1.574/8267 CPU: 2 UID: 0 PID: 8267 Comm: syz.1.574 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __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 ecryptfs_verify_auth_tok_from_key+0x3b7/0x400 fs/ecryptfs/keystore.c:465 ecryptfs_keyring_auth_tok_for_sig+0x9e/0x1f0 fs/ecryptfs/keystore.c:1606 ecryptfs_init_global_auth_toks fs/ecryptfs/main.c:194 [inline] ecryptfs_validate_options fs/ecryptfs/main.c:420 [inline] ecryptfs_get_tree+0x584/0x1580 fs/ecryptfs/main.c:453 vfs_get_tree+0x92/0x320 fs/super.c:1943 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount fs/namespace.c:3986 [inline] path_mount+0x7d0/0x2850 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount fs/namespace.c:4542 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4542 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: 0033:0x7fe179b9f559 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:00007fe17aace028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe179e25fa0 RCX: 00007fe179b9f559 RDX: 0000200000000900 RSI: 00002000000008c0 RDI: 0000200000000880 RBP: 00007fe179c36b20 R08: 0000200000000940 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe179e26038 R14: 00007fe179e25fa0 R15: 00007fff4593fbc8 Allocated by task 8267: 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:5531 [inline] __kmalloc_noprof+0x32f/0x840 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] user_preparse+0x9b/0x1c0 security/keys/user_defined.c:67 __key_create_or_update+0x3f6/0xe10 security/keys/key.c:861 key_create_or_update+0x42/0x60 security/keys/key.c:1028 __do_sys_add_key+0x2e8/0x460 security/keys/keyctl.c:134 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 ffff88802c771980 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 24 bytes inside of allocated 25-byte region [ffff88802c771980, ffff88802c771999) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c771 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801d442780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000400040 00000000f5000000 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1332, tgid 1332 (kworker/u33:9), ts 7485123482 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x2f6/0x3190 mm/page_alloc.c:5429 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab mm/slub.c:3499 [inline] new_slab+0xb1/0x6d0 mm/slub.c:3550 refill_objects+0xe3/0x410 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __kmalloc_cache_noprof+0x4ef/0x6d0 mm/slub.c:5676 _kmalloc_noprof include/linux/slab.h:991 [inline] slab_free_hook mm/slub.c:2732 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x40f/0x6c0 mm/slub.c:6757 file_free fs/file_table.c:104 [inline] __fput_deferred+0x3e9/0x4a0 fs/file_table.c:568 fput_close+0x118/0x250 fs/file_table.c:630 path_openat+0xd4c/0x23f0 fs/namei.c:5019 do_file_open+0x20e/0x430 fs/namei.c:5039 do_open_execat+0xd1/0x360 fs/exec.c:786 alloc_bprm+0x2d/0x9d0 fs/exec.c:1514 class_bprm_constructor fs/exec.c:1579 [inline] kernel_execve+0x8f/0x3a0 fs/exec.c:1976 call_usermodehelper_exec_async+0x239/0x4b0 kernel/umh.c:107 page_owner free stack trace missing Memory state around the buggy address: ffff88802c771880: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ffff88802c771900: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc >ffff88802c771980: 00 00 00 01 fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88802c771a00: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ffff88802c771a80: 00 00 00 00 fc fc fc fc 00 00 00 05 fc fc fc fc ==================================================================