Messages in this thread | | | Date | Mon, 23 Apr 2018 01:23:01 -0700 | Subject | KMSAN: uninit-value in strnlen | From | syzbot <> |
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Hello,
syzbot hit the following crash on https://github.com/google/kmsan.git/master commit a7f95e9c8a95e9fbb388c3999b61a17667cd3bbe (Sat Apr 21 13:50:22 2018 +0000) kmsan: disable assembly checksums syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=cd06c321e7147d03a65e
So far this crash happened 5 times on https://github.com/google/kmsan.git/master. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5785171018121216 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5117671628603392 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6310764688179200 Kernel config: https://syzkaller.appspot.com/x/.config?id=328654897048964367 compiler: clang version 7.0.0 (trunk 329391)
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+cd06c321e7147d03a65e@syzkaller.appspotmail.com 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.
================================================================== BUG: KMSAN: uninit-value in strnlen+0xc4/0x110 lib/string.c:499 CPU: 1 PID: 4507 Comm: syzkaller579712 Not tainted 4.16.0+ #85 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+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 strnlen+0xc4/0x110 lib/string.c:499 dev_name_hash net/core/dev.c:209 [inline] dev_get_by_name_rcu net/core/dev.c:764 [inline] dev_get_by_name+0x6e/0x350 net/core/dev.c:791 pppoe_connect+0xcb7/0x2360 drivers/net/ppp/pppoe.c:665 SYSC_connect+0x41a/0x510 net/socket.c:1639 SyS_connect+0x54/0x80 net/socket.c:1620 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x43fcf9 RSP: 002b:00007ffca4bd4978 EFLAGS: 00000213 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9 RDX: 0000000000000007 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401620 R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000
Local variable description: ----address@SYSC_connect Variable was created at: SYSC_connect+0x6f/0x510 net/socket.c:1622 SyS_connect+0x54/0x80 net/socket.c:1620 ==================================================================
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