Messages in this thread | | | Date | Fri, 21 Sep 2018 14:14:03 -0700 | Subject | KMSAN: uninit-value in memcmp (2) | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 74ee2200b89f kmsan: bump .config.example to v4.17-rc3 git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=11bcd7e7800000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ca1e57bafa8ab1f dashboard link: https://syzkaller.appspot.com/bug?extid=d3402c47f680ff24b29c compiler: clang version 7.0.0 (trunk 329391) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=102533c7800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156dab5b800000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d3402c47f680ff24b29c@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KMSAN: uninit-value in memcmp+0x119/0x180 lib/string.c:861 CPU: 0 PID: 38 Comm: kworker/0:1 Not tainted 4.17.0-rc3+ #88 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 memcmp+0x119/0x180 lib/string.c:861 __hw_addr_add_ex net/core/dev_addr_lists.c:61 [inline] __dev_mc_add+0x1fc/0x900 net/core/dev_addr_lists.c:670 dev_mc_add+0x6d/0x80 net/core/dev_addr_lists.c:687 igmp6_group_added+0x2db/0xa00 net/ipv6/mcast.c:662 ipv6_dev_mc_inc+0xe9e/0x1130 net/ipv6/mcast.c:914 addrconf_join_solict net/ipv6/addrconf.c:2103 [inline] addrconf_dad_begin net/ipv6/addrconf.c:3853 [inline] addrconf_dad_work+0x462/0x2a20 net/ipv6/addrconf.c:3979 process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2145 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2279 kthread+0x539/0x720 kernel/kthread.c:239 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:412
Local variable description: ----buf@igmp6_group_added Variable was created at: igmp6_group_added+0x4a/0xa00 net/ipv6/mcast.c:650 ipv6_dev_mc_inc+0xe9e/0x1130 net/ipv6/mcast.c:914 ==================================================================
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