From patchwork Mon Oct 7 14:49:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13824854 Received: from mail-pg1-f173.google.com (mail-pg1-f173.google.com [209.85.215.173]) (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 7FD6F1D7E41; Mon, 7 Oct 2024 14:50:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728312622; cv=none; b=so38UZGRv5DIzwogrfKiiHudY34C1HfNQg73ZgvUpLp/sCMsU290FXswynbyd+pYXKfcoDfakB6KZ5xO8RL1j3O8+dEsRhJneKj4YMu46G3quEr8i+gLXzmTRUHWIgRbCPRkapQzhDo/a+QWBu1nxZhZTY5UsAZfCd6j8gwBJ4g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728312622; c=relaxed/simple; bh=56ESQtaoBbBqZU/saKgTljkr5U/isylgWUhSQpUUDZM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HROxTGOvOkyHIy/10GeBZJ0dtayDd8XpI1TzTNL6dZ61xxhCiDvJp0vYa1vJs+7sFZ7kajpYVDAo3CfnaEYAIjstMwen3kE+pwsELLV4nGaM4J9gDE2ey4XyJ7GcCMDgpNgSQA96pQbHHz9IoD9qpkACnUkzq4n2024ZRFV/lTs= 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=gtrYdtMm; arc=none smtp.client-ip=209.85.215.173 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="gtrYdtMm" Received: by mail-pg1-f173.google.com with SMTP id 41be03b00d2f7-7ea12e0dc7aso576568a12.3; Mon, 07 Oct 2024 07:50:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728312620; x=1728917420; 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=gtrYdtMmh/ZUka/K778EFWlj2oajBLeN5R3sTnWsm3+KDYj4IIWrBLE0R127i71/IP 3zqnXMpjt0DenzY0GShXCwPJq89pqN2Zu2PQ8il11RJZSnMOuE3zDaXePMzqYd+LtrCa tv++6lZKFWEt0CKqAg02dI/Bh4L1o56bmc/6IS6c21S3Uztk7JJwH41Ask8e/S7NAPn4 BzSmJZeWVs5js36ffwMESJXzXbAkikQSeYEI0Gdyy6ca3JfDwD8umLYQFGfptQj8JuOP 5b94tZsg+mvgTbe5KgsQ++yrXfVfx3RLtFto+p484iMN3fCDePnoBLHs+b07vzrE8mqi Sxcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728312620; x=1728917420; 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=c00UglUVN1bEeYAH6kmwIHNyKVBLlnPfS6m3sy0zUYuR7LzF8NhY3sEWhvqn1wPZrd ympy6hXHUwSjpc0oSVpC73mLORYkwWf3z5oYd8VEO1Zd31OP2NK/+XPvx39NtiyZZWcM /2p+G9GwmAxDFhMy4Et8kxso+BvNvM/6XqHgDkpfTST8u8LVZEOIckXR9rRR9FwPEFuH DsVFLErLMxNJzOcsDJXoPEC/I66a+P38uJJpreoXOUrQQMwWPK5rwh8IAUmtywp2s96r qEy5iTZ5rucb+G0aJM/j8Nm+jbSSbkX4/32G7ArhGTOW2WR4ayxWlHJJTzHPca+N5Swg PLUA== X-Forwarded-Encrypted: i=1; AJvYcCUGaKKnr2Qm/j7nzbnEMXKxEcTF4e0ki5pJ09ALhHxFn/wVXdCxBCutsAeJcR7zSefgncMnDjbqMVvd4OzoLA==@vger.kernel.org, AJvYcCUm1x//w0AD1/4hTiUHuZZDkjhSK+NQmE1eqQ+mGwHhqGGp3z31SJzsgrovvvWVkd1fUgKC@vger.kernel.org, AJvYcCV+QKgnbaYh2vjNUPoljvJsBWxSZNBqAJ1neTXcQkAnyGtYsvcrcX9dXjLMntyUVswQPYwom42nvjv5dUj2KFGS2s3ghZ8h@vger.kernel.org, AJvYcCVyxY17vbnEA8U7/EHQ7wy6UT/a6r3j+Vc8W7W28R7WdaiAja+YyIGBbAJ5jBPzrhK402asnmbKig==@vger.kernel.org, AJvYcCWDIpMiO3r5LdswIszRErk54zUCs71qBzevZ83pjkdnmAbZd1Kx/WNCEQbTWLo79TuyMSJrughqhpkKFwoqUJaIbNtV@vger.kernel.org, AJvYcCWROuQ+ZrdRatouGdD07Isua7I40/w10wQvMUPZddFobXv2z+rA7t6kLKBPI6qg7lNnWy9zQ0Ta@vger.kernel.org, AJvYcCWoQWRfmJ34/Qyj+AjvaN7AFRQwZTwZa+QUOagyoiLEml6oRGi2vQbCcenFwux/5sGu6UqOZw==@vger.kernel.org X-Gm-Message-State: AOJu0Yw52il1YnzVR68dSgGWUPPiPfOZSgWFX7uHtZ2oNHUoZ5Q6lhJ8 ihwAG/Cv86KutR09ZiqOIAaWb7dE7y+W6l1k+JLAFesOWVgSApiH X-Google-Smtp-Source: AGHT+IGdJ8333QIHr9VJupVLpNtoPXxXbiV/WsIALKPyiyHXyFn3qrINZ3iUgrsX4T7ZKXd0XBWepw== X-Received: by 2002:a05:6a21:9201:b0:1d5:1729:35ec with SMTP id adf61e73a8af0-1d6dfa27a24mr21138343637.7.1728312619784; Mon, 07 Oct 2024 07:50:19 -0700 (PDT) Received: from localhost.localdomain ([223.104.210.43]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71df0d7cf82sm4466432b3a.200.2024.10.07.07.50.10 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Oct 2024 07:50:19 -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 , Quentin Monnet Subject: [PATCH v9 4/7] bpftool: Ensure task comm is always NUL-terminated Date: Mon, 7 Oct 2024 22:49:08 +0800 Message-Id: <20241007144911.27693-5-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-security-module@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;