From patchwork Mon Oct 7 14:49:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13824845 X-Patchwork-Delegate: rostedt@goodmis.org 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 26B901D416B; Mon, 7 Oct 2024 14:50:10 +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=1728312612; cv=none; b=S3g0Q8lL85z6qn/S5adNZzQeUbkw14fe48CrSifhEmav0sGpOWklCWb7x6aKX9RgSJeUsySg2kJENB/dH6n3OzXVtrfD9nLV64IxlQF2+5CiynUUtCoQQFwvkdA5dX2crqJsaXYG9UrQLsWqOrg6gvUGCJ2gluVDW5gFQ8O0UzM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728312612; c=relaxed/simple; bh=ABhttoS6oXw2j+hmHjcdgyTovB2nFehBatzjdciJ3nM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=DfEKtkFOeBSo3+iUi0hmrSUBxL+HvDcEabbJ8aGf8lUR4+yYhTTUFX3Sc8w/3AL23XAu7Uz/AsyMgPos95sCKI7nOHUBaGCeei4U6jAzqTGjh/6zTvIEFahQUGmvRFJLDDlFmgE3nO7IG40EIEtCTaee6LrihoHXn/cOwLQ8kfQ= 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=YsAqLCUJ; 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="YsAqLCUJ" Received: by mail-pg1-f177.google.com with SMTP id 41be03b00d2f7-7c1324be8easo3993383a12.1; Mon, 07 Oct 2024 07:50:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728312610; x=1728917410; 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=mIIMsSPqVp5AusgTbRbdrgF3qEr8ccJBENe3BbQ0UBw=; b=YsAqLCUJNB0+8zHwcXeK0Y/hsPEhokIF6a+zjLuaOSj0POs9HPco39Qqyt+l4Ib3cr CALIfUwRrmeSxTJxzpSzc7bSje3ZSZrpJQjFEJSHSVciK7q653ERsyi8zBJnKgY3cuzJ S8OBt1iXcBHe3SyFM7i2lj+hD1GH37h3i1tZzEcMyepaoP/ZGByWCdc9N32AdXHThIZj kmPYo27+9RoZ6Q1RRVMpBAQG+GGccywlJqY1qSq8dBub1OL+yyrKMlCnQ2HBl+sAK8JG 2AdUYUjZtg7/Glni5539xEueO3GNciL6EaGeoLk4/IqM2ZbpioDOBtIZDd50Jz99ZssZ oYTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728312610; x=1728917410; 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=mIIMsSPqVp5AusgTbRbdrgF3qEr8ccJBENe3BbQ0UBw=; b=l1GSSSIFdBo2uhjCHaWkNEDOeLkd/iDgDap52o2Q4UhqQANfedeYVryIFcTIE+Oa1T vABtuD9eOq7bPJgvz6jWowdqvWolQHf4YRy7hEoauEDxf77fXminoklJg8QwJuW/mxaQ DFdCy3Z5ZzI+8b/u7Z6hVWxuAY46lVvVFD7hx2ygGp0mby7Kkcm2fff4upXTWHdf4i/4 01IleleIalj1p7uYb71jGba8tC/LpZwMr0eCxb1YH6u5Ggo9EN34Zlc0JBU0gK3s9Sbz +hAmbGDdy6WahrDWd/344VfnqoP0S9HGH/JYPkGOYWKUXNVdrsE+00Iwp+BZmPRenJHA 0bDQ== X-Forwarded-Encrypted: i=1; AJvYcCUbqIfrLaFXnMtslCc8OEAIx+YDAaNnG+xDe0+hT9+JJp44LFe5XNhBfc20VqMGkqrttszRYWto@vger.kernel.org, AJvYcCUm4afV1S3HnXotvQxLTzQJihV4gpVBSqreZNLhEHFcLZIJ6Mt7Nwb9AE7s4If0jvEW2Zw4WBv1Ml+g4w+pvQ==@vger.kernel.org, AJvYcCVZmNUeD58kxZqrbJGr9hC9j4RCx5p31HHS3jVheEWdNk8swgU8yL3H3K4ZwZzBHmUw2MPdiA==@vger.kernel.org, AJvYcCWId/ql8tgjp82Hpfzk84x4PtuJapU6T7j0coF57Z6DcJxpfHDg92RVo6LBUQLVAOCCcQ6l5J51mtgx4NhZh2KeToTf@vger.kernel.org, AJvYcCWRLMIElpnt9CZukVlI8w+VDQOSXKPT6g65feEFgvtzBdlUT0H5Pw9ixu5+pSoyALeq2eIAmGQMn6Dv7WJPBH/5VO/+3dv9@vger.kernel.org, AJvYcCXIqx9jAYQKUSBfT8eClrTUWrluMfL76IFPTpRVcJntUSwB5yHlDVAogqdKcwb3VAOPqsCR@vger.kernel.org, AJvYcCXYt8QsrtnCuqB8AMjdxlDtElzxTZMSHj7DkUNAe9Rf0PFViVTjyF7USEvgCvQ0Am9A39gsSeKitg==@vger.kernel.org X-Gm-Message-State: AOJu0YwK99sFou/N6cOz7cSa/ZaiTXSPGYRwKNSOod3OvMu2K1glzXzI 3XCwBfPVOQgge2ZLCYGP3N1Ey9HNjWBoViibKvjOE7+kUQzy3FNiNjPFJWCQ8Vs= X-Google-Smtp-Source: AGHT+IH1T8Z0gS8IM4ef+l7Ymhr8kCvYXDO1WRSDOYONvg5988rUz94lZcz2t9FfyyE+YN0pNKr/oQ== X-Received: by 2002:a05:6a21:9204:b0:1d4:fafb:845d with SMTP id adf61e73a8af0-1d6e02b14a1mr18448839637.2.1728312610165; Mon, 07 Oct 2024 07:50:10 -0700 (PDT) Received: from localhost.localdomain ([223.104.210.43]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71df0d7cf82sm4466432b3a.200.2024.10.07.07.49.57 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Oct 2024 07:50:09 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org, keescook@chromium.org, alx@kernel.org, justinstitt@google.com, 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 , Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Ondrej Mosnacek Subject: [PATCH v9 3/7] security: Replace memcpy() with get_task_comm() Date: Mon, 7 Oct 2024 22:49:07 +0800 Message-Id: <20241007144911.27693-4-laoar.shao@gmail.com> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20241007144911.27693-1-laoar.shao@gmail.com> References: <20241007144911.27693-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Quoted from Linus [0]: selinux never wanted a lock, and never wanted any kind of *consistent* result, it just wanted a *stable* result. Using get_task_comm() to read the task comm ensures that the name is always NUL-terminated, regardless of the source string. This approach also facilitates future extensions to the task comm. Signed-off-by: Yafang Shao LINK: https://lore.kernel.org/all/CAHk-=wivfrF0_zvf+oj6==Sh=-npJooP8chLPEfaFV0oNYTTBA@mail.gmail.com/ [0] Acked-by: Paul Moore Cc: James Morris Cc: "Serge E. Hallyn" Cc: Stephen Smalley Cc: Ondrej Mosnacek --- security/lsm_audit.c | 4 ++-- security/selinux/selinuxfs.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/security/lsm_audit.c b/security/lsm_audit.c index 849e832719e2..9a8352972086 100644 --- a/security/lsm_audit.c +++ b/security/lsm_audit.c @@ -207,7 +207,7 @@ static void dump_common_audit_data(struct audit_buffer *ab, BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2); audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); - audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm))); + audit_log_untrustedstring(ab, get_task_comm(comm, current)); switch (a->type) { case LSM_AUDIT_DATA_NONE: @@ -302,7 +302,7 @@ static void dump_common_audit_data(struct audit_buffer *ab, char comm[sizeof(tsk->comm)]; audit_log_format(ab, " opid=%d ocomm=", pid); audit_log_untrustedstring(ab, - memcpy(comm, tsk->comm, sizeof(comm))); + get_task_comm(comm, tsk)); } } break; diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index e172f182b65c..c9b05be27ddb 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -708,7 +708,7 @@ static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, if (new_value) { char comm[sizeof(current->comm)]; - memcpy(comm, current->comm, sizeof(comm)); + strscpy(comm, current->comm); pr_err("SELinux: %s (%d) set checkreqprot to 1. This is no longer supported.\n", comm, current->pid); }