The patch titled
Clone flag CLONE_PARENT_TIDPTR leaves invalid results in memory
has been removed from the -mm tree. Its filename was
clone-flag-clone_parent_tidptr-leaves-invalid-results-in-memory.patch
This patch was dropped because it is obsolete
------------------------------------------------------
Subject: Clone flag CLONE_PARENT_TIDPTR leaves invalid results in memory
From: Daniel Jacobowitz <[EMAIL PROTECTED]>
Fix http://bugzilla.kernel.org/show_bug.cgi?id=7210
Do not implement CLONE_PARENT_SETTID until we know that clone will succeed.
If we do it too early NPTL's data structures temporarily reference a
non-existant TID.
Signed-off-by: Daniel Jacobowitz <[EMAIL PROTECTED]>
Cc: "Eric W. Biederman" <[EMAIL PROTECTED]>
Acked-by: Roland McGrath <[EMAIL PROTECTED]>
Cc: Oleg Nesterov <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
kernel/fork.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff -puN
kernel/fork.c~clone-flag-clone_parent_tidptr-leaves-invalid-results-in-memory
kernel/fork.c
---
a/kernel/fork.c~clone-flag-clone_parent_tidptr-leaves-invalid-results-in-memory
+++ a/kernel/fork.c
@@ -1041,11 +1041,6 @@ static struct task_struct *copy_process(
delayacct_tsk_init(p); /* Must remain after dup_task_struct() */
copy_flags(clone_flags, p);
p->pid = pid_nr(pid);
- retval = -EFAULT;
- if (clone_flags & CLONE_PARENT_SETTID)
- if (put_user(p->pid, parent_tidptr))
- goto bad_fork_cleanup_delays_binfmt;
-
INIT_LIST_HEAD(&p->children);
INIT_LIST_HEAD(&p->sibling);
p->vfork_done = NULL;
@@ -1286,6 +1281,14 @@ static struct task_struct *copy_process(
total_forks++;
spin_unlock(¤t->sighand->siglock);
write_unlock_irq(&tasklist_lock);
+
+ /*
+ * Now that we know the fork has succeeded, record the new
+ * TID. It's too late to back out if this fails.
+ */
+ if (clone_flags & CLONE_PARENT_SETTID)
+ put_user(p->pid, parent_tidptr);
+
proc_fork_connector(p);
return p;
@@ -1316,7 +1319,6 @@ bad_fork_cleanup_policy:
bad_fork_cleanup_cpuset:
#endif
cpuset_exit(p);
-bad_fork_cleanup_delays_binfmt:
delayacct_tsk_free(p);
if (p->binfmt)
module_put(p->binfmt->module);
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
clone-flag-clone_parent_tidptr-leaves-invalid-results-in-memory.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html