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-rw-r--r--kernel/ptrace.c39
1 files changed, 21 insertions, 18 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 4e0f0ec..b0f8da8 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -148,12 +148,16 @@ int ptrace_may_attach(struct task_struct *task)
int ptrace_attach(struct task_struct *task)
{
int retval;
- task_lock(task);
+
retval = -EPERM;
if (task->pid <= 1)
- goto bad;
+ goto out;
if (task->tgid == current->tgid)
- goto bad;
+ goto out;
+
+ write_lock_irq(&tasklist_lock);
+ task_lock(task);
+
/* the same process cannot be attached many times */
if (task->ptrace & PT_PTRACED)
goto bad;
@@ -166,17 +170,15 @@ int ptrace_attach(struct task_struct *task)
? PT_ATTACHED : 0);
if (capable(CAP_SYS_PTRACE))
task->ptrace |= PT_PTRACE_CAP;
- task_unlock(task);
- write_lock_irq(&tasklist_lock);
__ptrace_link(task, current);
- write_unlock_irq(&tasklist_lock);
force_sig_specific(SIGSTOP, task);
- return 0;
bad:
+ write_unlock_irq(&tasklist_lock);
task_unlock(task);
+out:
return retval;
}
@@ -417,21 +419,22 @@ int ptrace_request(struct task_struct *child, long request,
*/
int ptrace_traceme(void)
{
- int ret;
+ int ret = -EPERM;
/*
* Are we already being traced?
*/
- if (current->ptrace & PT_PTRACED)
- return -EPERM;
- ret = security_ptrace(current->parent, current);
- if (ret)
- return -EPERM;
- /*
- * Set the ptrace bit in the process ptrace flags.
- */
- current->ptrace |= PT_PTRACED;
- return 0;
+ task_lock(current);
+ if (!(current->ptrace & PT_PTRACED)) {
+ ret = security_ptrace(current->parent, current);
+ /*
+ * Set the ptrace bit in the process ptrace flags.
+ */
+ if (!ret)
+ current->ptrace |= PT_PTRACED;
+ }
+ task_unlock(current);
+ return ret;
}
/**