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ptrace: Always take siglock in ptrace_resume

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Make code analysis simpler and future changes easier by
always taking siglock in ptrace_resume.

Tested-by: Kees Cook <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman committed 2022-05-11 14:36:30 -05:00
1 parent 2500ad1c7f
commit 5b4197cb28
1 file changed
+2 -11
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kernel/ptrace.c
+2 -11
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@@ -837,8 +837,6 @@ static long ptrace_get_rseq_configuration(struct task_struct *task,
static int ptrace_resume(struct task_struct *child, long request,
unsigned long data)
{
bool need_siglock;
if (!valid_signal(data))
return -EIO;
@@ -874,18 +872,11 @@ static int ptrace_resume(struct task_struct *child, long request,
* Note that we need siglock even if ->exit_code == data and/or this
* status was not reported yet, the new status must not be cleared by
* wait_task_stopped() after resume.
*
* If data == 0 we do not care if wait_task_stopped() reports the old
* status and clears the code too; this can't race with the tracee, it
* takes siglock after resume.
*/
need_siglock = data && !thread_group_empty(current);
if (need_siglock)
spin_lock_irq(&child->sighand->siglock);
spin_lock_irq(&child->sighand->siglock);
child->exit_code = data;
wake_up_state(child, __TASK_TRACED);
if (need_siglock)
spin_unlock_irq(&child->sighand->siglock);
spin_unlock_irq(&child->sighand->siglock);
return 0;
}