From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-m16.yeah.net (mail-m16.yeah.net [220.197.32.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4CE8F394EBD for ; Mon, 8 Jun 2026 08:43:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.32.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780908191; cv=none; b=L18pXTqY+bb6p7u1IZED42fFWVzap6kIGVoSzyv3AIHT/DewfCjY577adfXjZUgLIlXCL4KQkVWIp+a9eVNU+lYu7DWSqhX3UuSdl1g3Q5G9wCQIbiVbxHY/xKyZgTSQSOl3nSE3nnuCW2uZDyELXIHk0fN7d6k/7tOzCJucYRo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780908191; c=relaxed/simple; bh=RQlenSubY9phlUwrqB/tSh+JxXPS2TimyUfYH1dBdBo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=DU4ET1HQWuX+DYHPDWlhyt0vE64bz/raeFIzNwhU2jdYsw1jYQLsOLG7KAlQtnr3IuStBO2w9xiVjco77dHSkBbzCa8dLl4xXOpokDh6ecArp44oTAkIox4VL7oj6A2yRL+pw4qwFH12Z6dj6yAKwHk0j7T01KkFOSCuuvO70r0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yeah.net; spf=pass smtp.mailfrom=yeah.net; dkim=pass (1024-bit key) header.d=yeah.net header.i=@yeah.net header.b=XEIK4IJc; arc=none smtp.client-ip=220.197.32.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yeah.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yeah.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=yeah.net header.i=@yeah.net header.b="XEIK4IJc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yeah.net; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; bh=/5w5tmENBF0BOa1OabHGmblzw3lw/xq2l3XiIb81OeM=; b=XEIK4IJc9AbmKKpOlcqjPfOSMS04uLb4s3iqjPwEa8XlLBsIgBT2RNuu9aTKhG bx16PAqZ9Jm3G+izvaTuxzP8xpxLrVm9dnjsiujOwORplGTUtXbKJC/GPasZ0+ym wfZ5mvqAbKG5Elx7W+9PK/yV1NZgLSdATQQvxU5Fzlcl4= Received: from zhang.. (unknown []) by gzsmtp2 (Coremail) with UTF8SMTPSA id Ms8vCgD3f_sjgCZqDg0GAA--.10877S4; Mon, 08 Jun 2026 16:41:12 +0800 (CST) From: Ziran Zhang To: Ingo Molnar , Peter Zijlstra Cc: Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , linux-kernel@vger.kernel.org, Ziran Zhang Subject: [PATCH] sched/core: Replace sprintf() with scnprintf() in init_idle() Date: Mon, 8 Jun 2026 16:40:32 +0800 Message-ID: <20260608084032.6883-1-zhangcoder@yeah.net> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CM-TRANSID:Ms8vCgD3f_sjgCZqDg0GAA--.10877S4 X-Coremail-Antispam: 1Uf129KBjvdXoW7GF48tFWrWF4ruFy3Gr1xZrb_yoWDCFc_ua 47Gr1kKw1DGryIyr45Xa4Sya4IqayYvFWF9w45ArZrA3ykGwsxGan5JFyrJr48Grs7ZFy5 ArZ0qF1kJr1UWjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7xR_UUUUUUUUU== X-CM-SenderInfo: x2kd0wpfrgv2o61htxgoqh3/1tbiIghOD2omgChVkQAA3L The kernel documentation notes that sprintf() is deprecated and unsafe. Replace the deprecated sprintf() with the bounded scnprintf() when formatting the idle task's comm. This prevents a potential buffer overflow if INIT_TASK_COMM or the CPU number ever grow beyond the remaining space in the 16‑byte comm field. Signed-off-by: Ziran Zhang --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index a2f86807f..215b241af 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8302,7 +8302,7 @@ void __init init_idle(struct task_struct *idle, int cpu) idle->sched_class = &idle_sched_class; ftrace_graph_init_idle_task(idle, cpu); vtime_init_idle(idle, cpu); - sprintf(idle->comm, "%s/%d", INIT_TASK_COMM, cpu); + scnprintf(idle->comm, sizeof(idle->comm), "%s/%d", INIT_TASK_COMM, cpu); } int cpuset_cpumask_can_shrink(const struct cpumask *cur, -- 2.43.0