================================================================== BUG: KASAN: slab-out-of-bounds in md5_block+0x95/0x8d0 lib/crypto/md5.c:40 Read of size 64 at addr ffff88803dfe04e0 by task syz.1.578/7804 CPU: 3 UID: 0 PID: 7804 Comm: syz.1.578 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 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_slow+0x155/0x320 fs/namei.c:1919 lookup_slow+0x50/0x70 fs/namei.c:1936 walk_component fs/namei.c:2282 [inline] lookup_last fs/namei.c:2789 [inline] path_lookupat+0x5e8/0xc40 fs/namei.c:2813 filename_lookup+0x202/0x590 fs/namei.c:2842 user_path_at+0x3c/0x60 fs/namei.c:3641 __do_sys_pivot_root fs/namespace.c:4786 [inline] __se_sys_pivot_root fs/namespace.c:4774 [inline] __x64_sys_pivot_root+0x170/0x1c0 fs/namespace.c:4774 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: 0033:0x7fa62a59e159 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:00007fa6287d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 00007fa62a826090 RCX: 00007fa62a59e159 RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000200000000040 RBP: 00007fa62a63506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa62a826128 R14: 00007fa62a826090 R15: 00007fffcfc172a8 Allocated by task 7799: 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 ecryptfs_add_new_key_tfm+0xa9/0x590 fs/ecryptfs/crypto.c:1506 ecryptfs_validate_options fs/ecryptfs/main.c:386 [inline] ecryptfs_get_tree+0xd72/0x15b0 fs/ecryptfs/main.c:453 vfs_get_tree+0x92/0x320 fs/super.c:1932 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount fs/namespace.c:3848 [inline] path_mount+0x7d0/0x24c0 fs/namespace.c:4168 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount fs/namespace.c:4374 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4374 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 ffff88803dfe0400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 224 bytes inside of allocated 256-byte region [ffff88803dfe0400, ffff88803dfe0500) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3dfe0 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 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801c042b40 dead000000000100 dead000000000122 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5732, tgid 5732 (syz-executor), ts 49213438685 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:7418 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] __kmalloc_cache_noprof+0x4f4/0x6d0 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ____ip_mc_inc_group+0x40b/0x10d0 net/ipv4/igmp.c:1601 br_ip4_multicast_join_snoopers.isra.0+0x152/0x400 net/bridge/br_multicast.c:4240 br_multicast_join_snoopers+0x8b/0x120 net/bridge/br_multicast.c:4260 br_dev_open+0x112/0x150 net/bridge/br_device.c:174 __dev_open+0x3ad/0x8f0 net/core/dev.c:1724 __dev_change_flags+0x596/0x850 net/core/dev.c:9855 netif_change_flags+0x8d/0x160 net/core/dev.c:9920 do_setlink.isra.0+0x1ac4/0x3e60 net/core/rtnetlink.c:3271 rtnl_changelink net/core/rtnetlink.c:3910 [inline] __rtnl_newlink net/core/rtnetlink.c:4081 [inline] rtnl_newlink+0x13c1/0x2620 net/core/rtnetlink.c:4220 page last free pid 0 tgid 0 ts 49057690218 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 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x5f0/0x1260 kernel/rcu/tree.c:2919 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 Memory state around the buggy address: ffff88803dfe0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803dfe0480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88803dfe0500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88803dfe0580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803dfe0600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================