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ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP

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commit c200e4bb44e80b343c09841e7caaaca0aac5e5fa upstream.

User mode linux is the last user of the PT_DTRACE flag.  Using the flag to indicate
single stepping is a little confusing and worse changing tsk->ptrace without locking
could potentionally cause problems.

So use a thread info flag with a better name instead of flag in tsk->ptrace.

Remove the definition PT_DTRACE as uml is the last user.

Cc: stable@vger.kernel.org
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lkml.kernel.org/r/20220505182645.497868-3-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric W. Biederman
2022-04-26 16:30:17 -05:00
committed by Greg Kroah-Hartman
parent 92fb46536a
commit 6580673b17
6 changed files with 10 additions and 9 deletions
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2
arch/um/kernel/process.c
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@@ -341,7 +341,7 @@ int singlestepping(void * t)
{
struct task_struct *task = t ? t : current;
if (!(task->ptrace & PT_DTRACE))
if (!test_thread_flag(TIF_SINGLESTEP))
return 0;
if (task->thread.singlestep_syscall)