From patchwork Mon Aug 12 02:29:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13760028 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (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 4593381E; Mon, 12 Aug 2024 02:30:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723429860; cv=none; b=TrlfioQk2QXDi8ZFFf9uOl0sPahKnML1sspaFPnKAfmhnE/O4cDqj+ySDBZyyNLnxLZwSi9KSN6KKopo8xlFWb57to0i2Sl6lu0iqfXzH9lkk3PQb/Zz8efEBpd4B57gDk+99e4lRKmYwxBwg8slB10vGKga1IbygVS6IAgtkCo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723429860; c=relaxed/simple; bh=56ESQtaoBbBqZU/saKgTljkr5U/isylgWUhSQpUUDZM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=I3wVDjbBpyQH81tAvDfKTCrydZkWhU1GxL4VUfdML/l1KCIVf1WprbK7/eIzV3Dz9e6h8kL9IphuMiUqQM1JRwnd1w0YPDiC+bU87lD2K/PMn/CJNnQMOlK3Ol7qv6bRiIcDIlfMxG/s192KvgpkpwlxAZ27X+ncs9MAJj57ybQ= 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=lkhJrdke; arc=none smtp.client-ip=209.85.214.176 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="lkhJrdke" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-1fc5549788eso35532125ad.1; Sun, 11 Aug 2024 19:30:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1723429858; x=1724034658; 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=QQdkC9XISn7BWPlTE5/iE7aUj/L2jeLonKoaBsbNpS0=; b=lkhJrdke0FaFrel8b3Eq4wirXXx9WWd6Nsbc3heR8IjNIpnvn2d5DivG6L61VSAAKe fUT1rY1JSueyP5JhTYnkY0XHXK3XGmL35bLM38PWSqabiQ1LQh+uBBPaY4En/I9fadTz V5oC1KGvI5j25X5+YkXlFcF2MtTbFWgUdcSp9//BqlXJE/SjUH25CenLeahjQTWskpWQ +V2TayO18+JFg0iBdxj+3wWe4vdfR3Q9Udf2BkZawUxeCEXkuoVStsrTHN3TJJ9X5310 e0lEw9DhX1C9Y0iI01JWFzUCVUCqARrl+Wnorv0PoKi73QzNtQivWV1yaum4H/daGhIP unsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723429858; x=1724034658; 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=QQdkC9XISn7BWPlTE5/iE7aUj/L2jeLonKoaBsbNpS0=; b=iD2CQKz5sqhpR0zSM40lXr8QaN7iSaHuVP8yqD2blZLyovWiwVXilA5d8pUoGkc81g Kf5+33K6l676RkUkz0jwRP7OpHCBhL80PvrDXUixAs3Z2MswdHs/wxJ+/M4x5jRUYZNX NA63bLZaemuVbwAf+hkDB3HBs5EuLB8pUONMkd9bVA9w5cOt95Tu0UJCo0c73dxJASs2 hbLxlLmS8tn+YctMHAc8e3/UhTv9I2YD8kPBIlJ8185nehYT585pNFX4qRQsLV1uKtQ8 leyQtMYQdrarhlnhB0Bpgh2SEq8/CI4b7s0v8LchogFBbIHeG7jPo+2KTqJ4wDgiXTKW DoIA== X-Forwarded-Encrypted: i=1; AJvYcCVqqnQ+Hmel69ZHmB85LqUzhKyuaujXK6iSYJFZY9yL4xHvYO8YIOAOk4Y8OiUTeI3kuq/EkYUBCQkcKj8005GtBofInegZjSiyFWVl96CEJMdskuAwCypeXAmI5u6A3wkQbvtiYDYMdDReDzlTkxDg2ImAi+JCfdmoF8HADcD6B01Lw0lES4NBkWST/9IYppwuejux1mRuILKuY/aOd6EKNj83p5eFpy7YpyX1lQ81UhGmXiqGyAl94e6QW8Imtk0LDPe7RX0LcstyDD1rLNC3FKXJjzxwqammlyD54bxZMEn4N7ZEaNBxhcfjPPELuMjF4S1vBw== X-Gm-Message-State: AOJu0YzxQ7vO2hY7ZRIunl4WLNK7CPIqhVAB1bOaTzWjcsvAmPHptD3C qw3EAuQ/v9+1w9EIgXtZeFLaLL1bwWIpx2aKvjH7ueA/2rPZkq5S X-Google-Smtp-Source: AGHT+IEa9lv8MoV6zk/9zF8wCzjKsRZm15PR0yRidIjcflgd8FgwO2+8+6fP26BlJQqb1WyA3rzQJQ== X-Received: by 2002:a17:902:f54b:b0:1fd:d7cd:ee53 with SMTP id d9443c01a7336-200ae540e2fmr93875475ad.28.1723429858561; Sun, 11 Aug 2024 19:30:58 -0700 (PDT) Received: from localhost.localdomain ([39.144.39.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-200bb9fed69sm27884765ad.188.2024.08.11.19.30.52 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 11 Aug 2024 19:30:58 -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 , Quentin Monnet Subject: [PATCH v6 4/9] bpftool: Ensure task comm is always NUL-terminated Date: Mon, 12 Aug 2024 10:29:28 +0800 Message-Id: <20240812022933.69850-5-laoar.shao@gmail.com> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20240812022933.69850-1-laoar.shao@gmail.com> References: <20240812022933.69850-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net 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;