Messages in this thread | | | Date | Tue, 17 Jul 2018 06:23:02 -0700 | Subject | KMSAN: uninit-value in copy_siginfo_to_user | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 8fc8ecd1c58a kmsan: unpoison regs in arch_uprobe_exception.. git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=1758708f800000 kernel config: https://syzkaller.appspot.com/x/.config?x=9fa436d3ae606638 dashboard link: https://syzkaller.appspot.com/bug?extid=ab504332a376ca03331e compiler: clang version 7.0.0 (trunk 332596) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=170eeed7800000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ab504332a376ca03331e@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 ================================================================== BUG: KMSAN: uninit-value in copy_siginfo_to_user+0x383/0x1270 kernel/signal.c:2870 CPU: 1 PID: 4746 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #103 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686 copy_siginfo_to_user+0x383/0x1270 kernel/signal.c:2870 ptrace_peek_siginfo kernel/ptrace.c:741 [inline] ptrace_request+0x1d6a/0x20e0 kernel/ptrace.c:912 arch_ptrace+0x1f6/0x1230 arch/x86/kernel/ptrace.c:877 __do_sys_ptrace kernel/ptrace.c:1145 [inline] __se_sys_ptrace+0x309/0x850 kernel/ptrace.c:1110 __x64_sys_ptrace+0x11e/0x170 kernel/ptrace.c:1110 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a09 RSP: 002b:00007ffc971089c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 0000000000acf914 RCX: 0000000000455a09 RDX: 0000000000730004 RSI: 0000000000000001 RDI: 0000000000004209 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000558 R14: 00000000006fd0e0 R15: 000000000000b0fe
Local variable description: ----kiov@ptrace_request Variable was created at: ptrace_request+0x194/0x20e0 kernel/ptrace.c:885 arch_ptrace+0x1f6/0x1230 arch/x86/kernel/ptrace.c:877 ==================================================================
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