From patchwork Mon Jul 29 02:37:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13744293 X-Patchwork-Delegate: paul@paul-moore.com Received: from mail-pg1-f177.google.com (mail-pg1-f177.google.com [209.85.215.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C19C78C83; Mon, 29 Jul 2024 02:47:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722221276; cv=none; b=H9B+TFmq0mGl6L0DEEnLar69qh3bKgCqiNd4FaZIyZXwDpgdgxk1FBKvGP2dKVLMuPaG5TIgWMM+q9mLOXVH37kzitPHRzrWznBMXxlzcOE4Sq1zfuiASexEB5RUTiHRE2HR3c3zhz+hhQoyAMVdr+FPrlxGDVvNTGKUQPQRFCY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722221276; c=relaxed/simple; bh=wcSkD7vIjfQlJo/ird14KPUKFpdk4Q6HJbv4EbwFBc8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=EbNtBNOdhWOl4QgWFo7UiHiIKrA364Wz91abg1+LdZbFanGVzas7D1LGD42LHYnKNTuCgBGOYkZJ5E4A/RNOcTH257zjVTb8uqmAja2/zm/vOhVnk3KpwBUY70FFXOLDybaZxsCSgo0e+0d+3xRFQb2kBH+MeSDvjYKBirwxoJI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=IJ7YE85K; arc=none smtp.client-ip=209.85.215.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IJ7YE85K" Received: by mail-pg1-f177.google.com with SMTP id 41be03b00d2f7-7aa7703cf08so2048307a12.2; Sun, 28 Jul 2024 19:47:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1722221275; x=1722826075; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=YS5JkKLpH7rBBlezu3RsuBopuhXkHEJwrCmaySM0BwQ=; b=IJ7YE85K7ldec4vIjDqt67I2IJry7BrRpdi3g7OB4CTkq77VxGZJzl73+ma1D75XoC rwU4d1f6apJbFzc1CwWqHtkOOm3TNB0JYKY59P6KFwsrhO9ZBORRYmdmWaplfm4YlFEG TVH6+gosJIvhEI1PMMhwjDBHsi5m7bL1sInVzjAM05Aw3HqcO2pYmm8OtmOkctCmKDo7 vUvjpgVl7vMDQsqiM7PMb7RQz8BDk4Y7oemlF8Xs0XPZzyyOXfXvvxNU7i2G21hhqeSB druu0hR4OSmwZ4+eYLxTPCoV1yrxPJXoYZN9U1I+s8A1QNrlJFgOB0+bn4gsPjT6QUFE TSHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722221275; x=1722826075; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=YS5JkKLpH7rBBlezu3RsuBopuhXkHEJwrCmaySM0BwQ=; b=jrjRGdWraAyNLpIRHM+KRWJDt0eoxoq2mmq0j07ozzGUd+s6kH1IxS/UhJ6j1LOLlI D1SgLXCo+9Em2omrj8iXw8+iNYozrCA7ZPbYlFSXG0FB8nv5JTLvZ3PEZzGpY/XLpLEm ASDxUUBunUuxn2lZQueNYCNtYt3Jax3GbjVJ4kSmA15e5NngMs8NSPGjF5c+QXGA7Iuv 5BLnV2ZxNlVOgOIHyYLvk16vIiFT7NLjC+hGQvm+ALNjhysFCZcQvKnT/0kisLukG3x8 GbNVvtHO7fBqHCsLMna2aDeeWgotqdzE92EPv40X7n35LrOZcZLucnbQz//yv1BoIsid qD3A== X-Forwarded-Encrypted: i=1; AJvYcCVvsO17+tK6yBr3S7tkcpMFvTaOQB4dK8oq8h8cyKctgzB5PJKEQi/wQOXX7TbMoRCQhMNSfjDhBnotFL2/KkbKDtRBDxoT/xXrzQvpC0EiNVvNdvawJO83vKJCv0wL6dz5GImy1piGPrg3T9WUl1jgKHOIdh0IznmM9tJd5d+Rq2kLhakGCFApo9DBxn4RWSeBbnbdhbZgEU2ePl6tBLuh720YVzl10c2vXC0fBKY/53nDr07F4REcs2H2xuT0TSH0mtvFWNTa2G//B+pBCreEE54RbkldjNDQXjuaTvIb1XniyTzoLwbsLigXN9GSaY3A7TTpAQ== X-Gm-Message-State: AOJu0YwdwES9oZ+NyQifquIOjpCFuNfCsrkPuzUBXzJNuCht+shnq6I+ 08k5JLNfS3KwynpVbZ0afeaATl4h/2K9d/F70mnOapNf9SPhAULF X-Google-Smtp-Source: AGHT+IGXxWNnJLIJ5uPecbp6KsT2OOK8/ZuVg1FUEXn71WfglTXG9UPP1KLmHGuFVJ6pD1f6J8wciA== X-Received: by 2002:a17:90a:e00f:b0:2c9:7aa6:e15d with SMTP id 98e67ed59e1d1-2cf7e1fac4fmr7206984a91.20.1722221274655; Sun, 28 Jul 2024 19:47:54 -0700 (PDT) Received: from localhost.localdomain ([223.104.210.31]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2cf28c55a38sm7332247a91.10.2024.07.28.19.47.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 28 Jul 2024 19:47:54 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org, ebiederm@xmission.com, alexei.starovoitov@gmail.com, rostedt@goodmis.org, catalin.marinas@arm.com, penguin-kernel@i-love.sakura.ne.jp, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, audit@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Yafang Shao , "David S. Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni Subject: [PATCH v4 10/11] net: Replace strcpy() with __get_task_comm() Date: Mon, 29 Jul 2024 10:37:18 +0800 Message-Id: <20240729023719.1933-11-laoar.shao@gmail.com> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20240729023719.1933-1-laoar.shao@gmail.com> References: <20240729023719.1933-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 To prevent errors from occurring when the src string is longer than the dst string in strcpy(), we should use __get_task_comm() instead. This approach also facilitates future extensions to the task comm. Signed-off-by: Yafang Shao Cc: "David S. Miller" Cc: David Ahern Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni --- net/ipv6/ndisc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 254b192c5705..10d8e8c6ca02 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1942,7 +1942,7 @@ static void ndisc_warn_deprecated_sysctl(const struct ctl_table *ctl, static char warncomm[TASK_COMM_LEN]; static int warned; if (strcmp(warncomm, current->comm) && warned < 5) { - strcpy(warncomm, current->comm); + __get_task_comm(warncomm, TASK_COMM_LEN, current); pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n", warncomm, func, dev_name, ctl->procname,