CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f7c RIP = 0x0000000000000408 RFLAGS=0x00000046 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0050:0000000000002810 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:347 [inline] BUG: KASAN: slab-out-of-bounds in pdu_read+0x8a/0xc0 net/9p/protocol.c:64 Read of size 12140 at addr ffff88804996222d by task syz-executor.2/8556 CPU: 0 PID: 8556 Comm: syz-executor.2 Not tainted 4.14.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] pdu_read+0x8a/0xc0 net/9p/protocol.c:64 p9pdu_vreadf net/9p/protocol.c:167 [inline] p9pdu_readf+0x379/0x1790 net/9p/protocol.c:540 p9_client_version net/9p/client.c:990 [inline] p9_client_create+0xa1f/0x10f0 net/9p/client.c:1088 v9fs_session_init+0x1dc/0x1620 fs/9p/v9fs.c:422 IPVS: ftp: loaded support on port[0] = 21 v9fs_mount+0x79/0x850 fs/9p/vfs_super.c:135 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007fa4d68cac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa4d68cb6d4 RCX: 000000000045c889 RDX: 0000000020000180 RSI: 0000000020000500 RDI: 0000000000000000 RBP: 000000000076bf00 R08: 0000000020000700 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000074c R14: 00000000004ca0ed R15: 000000000076bf0c Allocated by task 8556: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7c0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] p9_fcall_alloc+0x19/0x90 net/9p/client.c:242 p9_tag_alloc net/9p/client.c:312 [inline] p9_client_prepare_req.part.0+0x72f/0xa90 net/9p/client.c:728 p9_client_prepare_req net/9p/client.c:718 [inline] p9_client_rpc+0x170/0x1180 net/9p/client.c:763 p9_client_version net/9p/client.c:980 [inline] p9_client_create+0x997/0x10f0 net/9p/client.c:1088 v9fs_session_init+0x1dc/0x1620 fs/9p/v9fs.c:422 v9fs_mount+0x79/0x850 fs/9p/vfs_super.c:135 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff888049962200 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 45 bytes inside of 16384-byte region [ffff888049962200, ffff888049966200) The buggy address belongs to the page: page:ffffea0001265800 count:1 mapcount:0 mapping:ffff888049962200 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888049962200 0000000000000000 0000000100000001 raw: ffffea0001267a20 ffffea0001266420 ffff88812fe55200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888049964100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888049964180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888049964200: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888049964280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888049964300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== CS: sel=0x0000, attr=0x08081, limit=0x00000000, base=0x0000000000000000 DS: sel=0x0000, attr=0x10000, limit=0x00100000, base=0x0000000000000000 minix_free_inode: bit 1 already cleared SS: sel=0x0000, attr=0x08085, limit=0x00000000, base=0x0000000000000000 ES: sel=0x0003, attr=0x10000, limit=0x00000000, base=0x0000000000000000 FS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1586895964.019:26): pid=8567 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="file0" dev="sda1" ino=15839 res=0 minix_free_inode: bit 1 already cleared MINIX-fs: mounting unchecked file system, running fsck is recommended GS: sel=0x0000, attr=0x10000, limit=0x00003000, base=0x0000000000000000 GDTR: limit=0x00000000, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x10000, limit=0x00000002, base=0x0000000000000000 IDTR: limit=0x00000000, base=0x0000000000000000 TR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 jfs: Unrecognized mount option "integraty" or missing value EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff8116f8df RSP = 0xffff888049e4f9b0 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f1858a73700 GSBase=ffff8880aea00000 TRBase=fffffe0000003000 GDTBase=fffffe0000001000 IDTBase=fffffe0000000000 CR0=0000000080050033 CR3=00000000938b0000 CR4=00000000001426f0 Sysenter RSP=fffffe0000002200 CS:RIP=0010:ffffffff866018a0 EFER = 0x0000000000000d01 PAT = 0x0407050600070106 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000ea EntryControls=0000d1ff ExitControls=002fefff ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000001 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffff8f97940339 EPT pointer = 0x000000009308d01e Virtual processor ID = 0x0001