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SubjectRe: [patch] ptrace-fix-2.5.33-A1

i've attached a combined patch of your two patches, against BK-curr. Looks
good to me, and since it passed your more complex ptrace tests ...

Ingo

--- linux/kernel/exit.c.orig Fri Sep 6 00:55:02 2002
+++ linux/kernel/exit.c Fri Sep 6 00:57:58 2002
@@ -66,6 +66,11 @@
atomic_dec(&p->user->processes);
security_ops->task_free_security(p);
free_uid(p->user);
+ if (unlikely(p->ptrace)) {
+ write_lock_irq(&tasklist_lock);
+ __ptrace_unlink(p);
+ write_unlock_irq(&tasklist_lock);
+ }
BUG_ON(!list_empty(&p->ptrace_list) || !list_empty(&p->ptrace_children));
unhash_process(p);

@@ -427,7 +432,7 @@
* There are only two places where our children can be:
*
* - in our child list
- * - in the global ptrace list
+ * - in our ptraced child list
*
* Search them and reparent children.
*/
@@ -442,14 +447,22 @@
read_unlock(&tasklist_lock);
}

-static inline void zap_thread(task_t *p, task_t *father)
+static inline void zap_thread(task_t *p, task_t *father, int traced)
{
- ptrace_unlink(p);
- list_del_init(&p->sibling);
- p->ptrace = 0;
+ /* If we were tracing the thread, release it; otherwise preserve the
+ ptrace links. */
+ if (unlikely(traced)) {
+ task_t *trace_task = p->parent;
+ __ptrace_unlink(p);
+ p->ptrace = 1;
+ __ptrace_link(p, trace_task);
+ } else {
+ p->ptrace = 0;
+ list_del_init(&p->sibling);
+ p->parent = p->real_parent;
+ list_add_tail(&p->sibling, &p->parent->children);
+ }

- p->parent = p->real_parent;
- list_add_tail(&p->sibling, &p->parent->children);
if (p->state == TASK_ZOMBIE && p->exit_signal != -1)
do_notify_parent(p, p->exit_signal);
/*
@@ -540,11 +553,11 @@

zap_again:
list_for_each_safe(_p, _n, &current->children)
- zap_thread(list_entry(_p,struct task_struct,sibling), current);
+ zap_thread(list_entry(_p,struct task_struct,sibling), current, 0);
list_for_each_safe(_p, _n, &current->ptrace_children)
- zap_thread(list_entry(_p,struct task_struct,ptrace_list), current);
+ zap_thread(list_entry(_p,struct task_struct,ptrace_list), current, 1);
/*
- * reparent_thread might drop the tasklist lock, thus we could
+ * zap_thread might drop the tasklist lock, thus we could
* have new children queued back from the ptrace list into the
* child list:
*/
@@ -715,7 +728,7 @@
retval = p->pid;
if (p->real_parent != p->parent) {
write_lock_irq(&tasklist_lock);
- ptrace_unlink(p);
+ __ptrace_unlink(p);
do_notify_parent(p, SIGCHLD);
write_unlock_irq(&tasklist_lock);
} else
--- linux/kernel/ptrace.c.orig Fri Sep 6 00:58:13 2002
+++ linux/kernel/ptrace.c Fri Sep 6 00:58:24 2002
@@ -29,7 +29,7 @@
if (!list_empty(&child->ptrace_list))
BUG();
if (child->parent == new_parent)
- BUG();
+ return;
list_add(&child->ptrace_list, &child->parent->ptrace_children);
REMOVE_LINKS(child);
child->parent = new_parent;
-
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