Set umask to 0x077 instead of the default. This prevents non-root user

from reading crashinfo output, which could contain some sensitive
information.

Reviewed by:	jhb
MFC after:	1 week

usr.sbin/crashinfo/crashinfo.sh

@@ -147,6 +147,8 @@ fi
 
 echo "Writing crash summary to $FILE."
 
+umask 077
+
 # Simulate uname
 ostype=$(echo -e printf '"%s", ostype' | gdb -x /dev/stdin -batch $KERNEL)
 osrelease=$(echo -e printf '"%s", osrelease' | gdb -x /dev/stdin -batch $KERNEL)