linux-kernel - [PATCH v2 06/12] ptrace: Reimplement PTRACE

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Date:   Fri, 29 Apr 2022 16:48:31 -0500
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     rjw@...ysocki.net, Oleg Nesterov <oleg@...hat.com>,
        mingo@...nel.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, mgorman@...e.de,
        bigeasy@...utronix.de, Will Deacon <will@...nel.org>,
        tj@...nel.org, linux-pm@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org, Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, linux-ia64@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        stable@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH v2 06/12] ptrace: Reimplement PTRACE_KILL by always sending SIGKILL

Call send_sig_info in PTRACE_KILL instead of ptrace_resume.  Calling
ptrace_resume is not safe to call if the task has not been stopped
with ptrace_freeze_traced.

Cc: stable@...r.kernel.org
Reported-by: Al Viro <viro@...iv.linux.org.uk>
Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 kernel/ptrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index ccc4b465775b..43da5764b6f3 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -1238,7 +1238,7 @@ int ptrace_request(struct task_struct *child, long request,
 	case PTRACE_KILL:
 		if (child->exit_state)	/* already dead */
 			return 0;
-		return ptrace_resume(child, request, SIGKILL);
+		return send_sig_info(SIGKILL, SEND_SIG_NOINFO, child);
 
 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
 	case PTRACE_GETREGSET:
-- 
2.35.3