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Subject[PATCH] CRED: ptrace_attach() should use the target process's mutex
Date
ptrace_attach() should use the target process's mutex when attaching to it,
not the current (tracer) process's mutex.

Signed-off-by: David Howells <dhowells@redhat.com>
---
kernel/ptrace.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 893a099..2ee343a 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -174,7 +174,7 @@ int ptrace_attach(struct task_struct *task)
/* Protect exec's credential calculations against our interference;
* SUID, SGID and LSM creds get determined differently under ptrace.
*/
- retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+ retval = mutex_lock_interruptible(&task->cred_exec_mutex);
if (retval < 0)
goto out;

@@ -218,7 +218,7 @@ repeat:
bad:
write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task);
- mutex_unlock(&current->cred_exec_mutex);
+ mutex_unlock(&task->cred_exec_mutex);
out:
return retval;
}


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