Commit 87f76d3a authored Jan 30, 2007 by bibo,mao Committed by Tony Luck Feb 05, 2007

[IA64] find thread for user rbs address

I encountered one problem when running ptrace test case the situation
is this: traced process's syscall parameter needs to be accessed, but
for sys_clone system call with clone_flag (CLONE_VFORK | CLONE_VM |
SIGCHLD) parameter. This syscall's parameter accessing result is wrong.

The reason is that vforked child process mm point is the same, but
tgid is different. Without this patch find_thread_for_addr will return
vforked process if vforked process is also stopped, but not the thread
which calls vfork syscall.

Signed-off-by: Tony Luck <tony.luck@intel.com>

parent ae0af3e3

arch/ia64/kernel/ptrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -607,7 +607,7 @@ find_thread_for_addr (struct task_struct *child, unsigned long addr)
		*/
		list_for_each_safe(this, next, &current->children) {
		p = list_entry(this, struct task_struct, sibling);
		if (p->mm != mm)
		if (p->tgid != child->tgid)
		continue;
		if (thread_matches(p, addr)) {
		child = p;