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[IA64] find thread for user rbs address

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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>
This commit is contained in:
bibo,mao 2007-01-30 11:02:19 +08:00 committed by Tony Luck
parent ae0af3e346
commit 87f76d3aaf
1 changed files with 1 additions and 1 deletions
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2
arch/ia64/kernel/ptrace.c
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@ -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;