On Fri, Jan 19, 2018 at 06:58:01AM -0800, syzbot wrote: > Hello, > > syzbot hit the following crash on linux-next commit > b625c1ff82272e26c76570d3c7123419ec345b20 > > So far this crash happened 5 times on linux-next, mmots. > C reproducer is attached. > syzkaller reproducer is attached. > Raw console output is attached. > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+e2d6cfb305e9f3911dea@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > device syz0 entered promiscuous mode > ------------[ cut here ]------------ > Bad or missing usercopy whitelist? Kernel memory exposure attempt detected > from SLAB object 'skbuff_head_cache' (offset 64, size 16)! > WARNING: CPU: 0 PID: 3663 at mm/usercopy.c:81 usercopy_warn+0xdb/0x100 > mm/usercopy.c:76 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 3663 Comm: syzkaller694156 Not tainted 4.15.0-rc7-next-20180115+ > #97 > 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+0x194/0x257 lib/dump_stack.c:53 > panic+0x1e4/0x41c kernel/panic.c:183 > __warn+0x1dc/0x200 kernel/panic.c:547 > report_bug+0x211/0x2d0 lib/bug.c:184 > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 > fixup_bug arch/x86/kernel/traps.c:247 [inline] > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 > invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1085 > RIP: 0010:usercopy_warn+0xdb/0x100 mm/usercopy.c:76 > RSP: 0018:ffff8801d99df548 EFLAGS: 00010282 > RAX: dffffc0000000008 RBX: ffffffff865cf19f RCX: ffffffff815aba6e > RDX: 0000000000000000 RSI: 1ffff1003b33be2e RDI: 1ffff1003b33be64 > RBP: ffff8801d99df5a0 R08: 0000000000000000 R09: 0000000000000000 > R10: 00000000000003e6 R11: 0000000000000000 R12: ffffffff86200d00 > R13: ffffffff85d2cfc0 R14: 0000000000000040 R15: 0000000000000010 > __check_heap_object+0x89/0xc0 mm/slab.c:4426 > check_heap_object mm/usercopy.c:236 [inline] > __check_object_size+0x272/0x530 mm/usercopy.c:259 > check_object_size include/linux/thread_info.h:112 [inline] > check_copy_size include/linux/thread_info.h:143 [inline] > copy_to_user include/linux/uaccess.h:154 [inline] > put_cmsg+0x233/0x3f0 net/core/scm.c:242 > sock_recv_errqueue+0x200/0x3e0 net/core/sock.c:2913 > packet_recvmsg+0xb2e/0x17a0 net/packet/af_packet.c:3296 > sock_recvmsg_nosec net/socket.c:803 [inline] > sock_recvmsg+0xc9/0x110 net/socket.c:810 > ___sys_recvmsg+0x2a4/0x640 net/socket.c:2179 > __sys_recvmmsg+0x2a9/0xaf0 net/socket.c:2287 > SYSC_recvmmsg net/socket.c:2368 [inline] > SyS_recvmmsg+0xc4/0x160 net/socket.c:2352 > entry_SYSCALL_64_fastpath+0x29/0xa0 > RIP: 0033:0x444339 > RSP: 002b:00007ffdb359d7d8 EFLAGS: 00000203 ORIG_RAX: 000000000000012b > RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444339 > RDX: 0000000000000001 RSI: 0000000020ef7fc4 RDI: 0000000000000005 > RBP: 00000000006ce018 R08: 0000000020000000 R09: 0000000000000001 > R10: 0000000000002000 R11: 0000000000000203 R12: 0000000000402020 > R13: 00000000004020b0 R14: 0000000000000000 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. Kees, has this been fixed yet? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
