random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in pdu_read+0x90/0xd0 net/9p/protocol.c:59 Read of size 42743 at addr ffff8801c280866d by task syz-executor517/4529 CPU: 1 PID: 4529 Comm: syz-executor517 Not tainted 4.18.0-rc4+ #138 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] pdu_read+0x90/0xd0 net/9p/protocol.c:59 p9pdu_vreadf net/9p/protocol.c:162 [inline] p9pdu_readf+0x579/0x2170 net/9p/protocol.c:536 p9_client_version net/9p/client.c:986 [inline] p9_client_create+0xde0/0x16c9 net/9p/client.c:1069 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4408d9 Code: e8 8c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 3b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffde2c51d28 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004408d9 RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000020000380 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000008180 R13: 0000000000401e30 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4529: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] p9_fcall_alloc+0x1e/0x90 net/9p/client.c:236 p9_tag_alloc net/9p/client.c:306 [inline] p9_client_prepare_req.part.8+0x754/0xcd0 net/9p/client.c:722 p9_client_prepare_req net/9p/client.c:757 [inline] p9_client_rpc+0x1bd/0x1400 net/9p/client.c:757 p9_client_version net/9p/client.c:976 [inline] p9_client_create+0xd09/0x16c9 net/9p/client.c:1069 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8801c2808640 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 45 bytes inside of 16384-byte region [ffff8801c2808640, ffff8801c280c640) The buggy address belongs to the page: page:ffffea00070a0200 count:1 mapcount:0 mapping:ffff8801da802200 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0007071408 ffff8801da801c48 ffff8801da802200 raw: 0000000000000000 ffff8801c2808640 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c280a500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c280a580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c280a600: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff8801c280a680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c280a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================