非root不能gdb attach的限制
Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
从ubuntu10.10开始,除非进程B是进程A的子进程,或者进程A为root运行,否则进程A不能调试进程B。这样一来增加了进程的安全。这个安全限制是默认的,但是可以通过修改配置文件来达到任意进程A可以调试进程B的目的。
修改前(/etc/sysctl.d/10-ptrace.conf):
kernel.yama.ptrace_scope = 1
修改后:
kernel.yama.ptrace_scope = 0