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static task_t *copy_process(unsigned long clone_flags,unsigned long stack_start,struct pt_regs *regs,unsigned long stack_size,int __user *parent_tidptr,int __user *child_tidptr,int pid)
{
int retval;
struct task_struct *p = NULL;
if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
return ERR_PTR(-EINVAL);
if ((clone_flags & CLONE_THREAD) && !(clone_flags & CLONE_SIGHAND))
return ERR_PTR(-EINVAL);
if ((clone_flags & CLONE_SIGHAND) && !(clone_flags & CLONE_VM))
return ERR_PTR(-EINVAL);
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¶øµÚ¶þÐе±CLONE_THREAD±»ÉèÖã¬Í¬Ê±CLONE_SIGHANDÓÖ±»ÇåÁãµÄʱºòÊDz»¿ÉÒԵģ¬ÒòΪͬһÏß³Ì×éÖеÄÇáÁ¿¼¶½ø³Ì±ØÐë¹²ÏíÐźÅ
CLONE_SIGHAND±êÖ¾±»ÉèÖã¬CLONE_VM±»ÇåÁãÒ²²»¿ÉÒÔ£¬ÒòΪ¹²ÏíÐźŴ¦Àí³ÌÐòµÄÇáÁ¿¼¶½ø³ÌÒ²±ØÐë¹²ÏíÄÚ´æÃèÊö·û
retval = security_task_create(clone_flags);£¯£¯Ö´Ðи½¼ÓµÄ°²È«¼ì²é
if (retval)
goto fork_out;
retval = -ENOMEM;
p = dup_task_struct(current);£¯£¯Îª×Ó½ø³Ì»ñÈ¡½ø³ÌÃèÊö·û
if (!p)
&nb
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