From patchwork Fri Jun 21 02:29:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13706690 Received: from mail-oi1-f170.google.com (mail-oi1-f170.google.com [209.85.167.170]) (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 5728D84A5B; Fri, 21 Jun 2024 02:31:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718937081; cv=none; b=T3of2x7ot+AwRzNhO1pD8yjYw6lgaPeQwlPQIJ562p5/KCoh+LLv6EUN1aQuSt9foZJ2pRmcFM/TqCIqOGeWI7NDu/rqqA2NDx/qJB6U99YWt6/I+IH0VP/dZW/ZqXx7Z7+hL9SXwOr0slxhQptSnwjiuNHhm1Yb/rC10bQQMIU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718937081; c=relaxed/simple; bh=a+jRmBNObp02hqUJFQx9ZHvGN1Vdde7wossr4Oq8bKQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=FCfmAe7Q1WhYZR3VWDZmvg+THc7zLFFgeMnXY3o5Fz9QSk1UBnAL9YPy0DGDxaSxxoxpJRdzez40ukCy/H/ho99cRvI8oYWT3l/CUwjkLSqkRFJdymMkX7Mk1gXvtHJw4cD4fvpCOZAm739HGnowtQLR0Mt70JLydWqk3eX4Fy0= 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=g4fzS+ip; arc=none smtp.client-ip=209.85.167.170 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="g4fzS+ip" Received: by mail-oi1-f170.google.com with SMTP id 5614622812f47-3d22378c59eso888231b6e.1; Thu, 20 Jun 2024 19:31:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718937079; x=1719541879; 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=c7QH8g7nY2INvVrL4NU75ftNhN6FL7HL04IiCAjwJmE=; b=g4fzS+ip8eAN8OoA0sPVgfMtS7X5NeNZXUhNbWRvFHwhjkRKrexnp1qgMKHNtdsHbH NeirQBqwFa3exmtAvTiLoXAtrlohcFFXtXPqrVWXGQvv6IX0shoipdOzpYNh13EBaCez wUBlP7bSP4xSckBrgTSJLBB62/dVWYBjpRRpmR4urucFao9R3i5tWfPMB7+2mMBc8Ulc sTbO2jKNgcNlo/L3I9rh8LLZAQ9caSMi8GDDyTQu+lLrFQWpjlgG5d2+ODNzmRWuYroc ZJveNvIp2CPqNuTGD67Ofyhhfqs6ed7PV3SkeBxH9SV8ciCYmY7R91tjK85kDW/5G0Wt xNZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718937079; x=1719541879; 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=c7QH8g7nY2INvVrL4NU75ftNhN6FL7HL04IiCAjwJmE=; b=N96F1KLEnILGPQ5Ze3sGWuQLvbTrxnTivpYMiKeO0kfE0ki2UvvxiujAt7lzmXbmSD DVdYd+EivuLPtxSZWBRrsInXGxskQt0LsI9A/dguiWZtyCNbo5auEeJwfokytcyaMPim K1oV7nRPTjuEZPGLRs+bzEiQh+GGLW+Ba6qZpSDXmV1yMPEAT31oITDcWCeLuuOMMnF0 Z0Svs5FhWje5JafPb2UOwQFGq6BbA7Vn2k8v+69NhQjsV++q6VvKfnW1x7XnnsqTm0+I IozcV1CoTETnfxj8ntsSg9Is8tbOfC4OMDqCAq+LBSoGBWaMMWjEjdkV52qwlhgC/cOb wDfQ== X-Forwarded-Encrypted: i=1; AJvYcCUBSfjLL70f/YsZ/Y/RS3VXiGjmlxMVWSCrRHSR3pfMy+5Ki+V5bKBbgucD+Vd0JgZjqBl7i8gP/8o+H8RezhpShlqzh8eMio4Kwrl2M7RoHWkKlsP8cWp+/1koYNCfm0GKnJ8yWe0f64ND2xK2mJ+FPPqqFbRZPvK43Iyt24YAFHs2NmYt9jZznpxVZg9j5bNlkqVAmk7BIiith+2ThHV1plVkehQUaZbIMn1kYYCKVvrhOj7Ez0rJOYkLhYxfeln3G8KVg7+Zdb/QAsi7i4EAOw94MeDytSFFMo591zcxAysZZrmsL4GjVR6c7JXrUSnfzGZXhg== X-Gm-Message-State: AOJu0YyBQ2X/WfdqGuTbPXGDBDmIvMmGX1Zuj4e94Wq8Z44ohzzOEQhL SHgJ0jVsKIHV6L2Po/z74nvPH5WoxlLBg+tJe8l5Jv+Rv3jI4etw5an2Ka79 X-Google-Smtp-Source: AGHT+IED/biJ/4HZ3XKtIPvcAUdQBx9cm4PcU9a703LBYQtgmllriwsa8W5+N5BARKh/qYuDuJagiw== X-Received: by 2002:a05:6808:f07:b0:3d2:21a7:8629 with SMTP id 5614622812f47-3d51bac4b56mr7794777b6e.41.1718937079354; Thu, 20 Jun 2024 19:31:19 -0700 (PDT) Received: from localhost.localdomain ([39.144.105.24]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-706511944d2sm332488b3a.70.2024.06.20.19.31.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 20 Jun 2024 19:31:18 -0700 (PDT) From: Yafang Shao To: torvalds@linux-foundation.org Cc: ebiederm@xmission.com, alexei.starovoitov@gmail.com, rostedt@goodmis.org, catalin.marinas@arm.com, akpm@linux-foundation.org, 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 , Quentin Monnet Subject: [PATCH v3 04/11] bpftool: Ensure task comm is always NUL-terminated Date: Fri, 21 Jun 2024 10:29:52 +0800 Message-Id: <20240621022959.9124-5-laoar.shao@gmail.com> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20240621022959.9124-1-laoar.shao@gmail.com> References: <20240621022959.9124-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Let's explicitly ensure the destination string is NUL-terminated. This way, it won't be affected by changes to the source string. Signed-off-by: Yafang Shao Reviewed-by: Quentin Monnet --- tools/bpf/bpftool/pids.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/bpf/bpftool/pids.c b/tools/bpf/bpftool/pids.c index 9b898571b49e..23f488cf1740 100644 --- a/tools/bpf/bpftool/pids.c +++ b/tools/bpf/bpftool/pids.c @@ -54,6 +54,7 @@ static void add_ref(struct hashmap *map, struct pid_iter_entry *e) ref = &refs->refs[refs->ref_cnt]; ref->pid = e->pid; memcpy(ref->comm, e->comm, sizeof(ref->comm)); + ref->comm[sizeof(ref->comm) - 1] = '\0'; refs->ref_cnt++; return; @@ -77,6 +78,7 @@ static void add_ref(struct hashmap *map, struct pid_iter_entry *e) ref = &refs->refs[0]; ref->pid = e->pid; memcpy(ref->comm, e->comm, sizeof(ref->comm)); + ref->comm[sizeof(ref->comm) - 1] = '\0'; refs->ref_cnt = 1; refs->has_bpf_cookie = e->has_bpf_cookie; refs->bpf_cookie = e->bpf_cookie;