From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f68.google.com (mail-wm1-f68.google.com [209.85.128.68]) (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 6368A329C7A for ; Tue, 23 Dec 2025 12:11:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.68 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766491870; cv=none; b=iuTudHXZDXxi3+926fH05FDdyaQj4bOMkaMvbCMWkuwS8Iq6wO2FZliGqsllXbiM6lW6KIwY8AtGmqZSNLFjqsDAYYkXqV1l/cMURtmfKqnUwfM0gQJeF7qem5aVCYOtk4mrzs757+ggp20dks0Hxo7Szk2bygl4igEBm4dwQgQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766491870; c=relaxed/simple; bh=LBZbirKjMcmopBpuSPX0NMZdd5FQ/yKjOijYhvNcls0=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=SZy2zZxsuA7cLbP+CX6/GPkftA8yOJTDds4ORJyo/SF7+/EsdcNKwIYYnhuvpHyJ89Dy8459QHMk7KscNPPFbihamizzdSf9/lFXeTd9Iu+LohByi3LicsLJ6WOb20SeG1cS5ckNiXXOBH7dzyY+L1/DN2vfCDweaIWyGOEGn2E= 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=DlPWO9Qx; arc=none smtp.client-ip=209.85.128.68 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="DlPWO9Qx" Received: by mail-wm1-f68.google.com with SMTP id 5b1f17b1804b1-4779aa4f928so48194295e9.1 for ; Tue, 23 Dec 2025 04:11:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1766491867; x=1767096667; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=u/wET59k4s2dAKSrBriEQvD/zKuN/8Hb0OllkRrq6ng=; b=DlPWO9QxQDsFwGqXyl6//2CPXP37yxoHpQ0N6tbe6YuhshVln7j2GHSdTOlcNvVA5l pfKCQ1eFyeg2I+CpswEUFfc+tLVVNJe71KLCpxX1cLWYxovUfhJGi13DmquvnqEp7u/Z mOUiKgBlK902YaolcA+qsp/m/JvuLORct66Y09dMEz1EVWDHKr4GRACMd80eMg/6TXL/ x4okTI+4MjwFnkKKROKtEkT+vIqb3Ff1rIkvyYxtm7RJM2Se5sOHA7g1/vdtgVrPYj0s QWAiLK4DaMsTgc/9DUWTF99tBy9xLzYPIlXu3TGl6pkimIjNVTLgJNrnnezGDnmiP0/u bD8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766491867; x=1767096667; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=u/wET59k4s2dAKSrBriEQvD/zKuN/8Hb0OllkRrq6ng=; b=qvVLZL9gaH2w64Og2kE4YFGu8thPp3KgxcbO0YK0M/kL6+F9rJt1t1Uy/H3hTF9mMz JoaVo+fVNvlZ74lwT6GHsQXAvMkStg30UXilZiNJ2ozcpPLCY94U12Rhc3tIUgLHLwdP E/Wg42XX/J5EQr8rPY0dhdAXAsvgUr9aN6I9xw1eqeJ7ZCdysSxstkQrloSxUDaDL/v9 LVE0oLaW4vu6dOxzUBCiB54OmErmX1F8v5ZLeul7RAvR/K2AqyCsRV9uNXjFZq3Cja37 Igf0zU3cUjqRWubMV00Cr16PHhIkYewwQhGDpzT83+YG5ilNkUgtGSp6srwrCQfiHSFh ucdQ== X-Forwarded-Encrypted: i=1; AJvYcCWEPQb06eCEXdmShOVuZLZ3kTG0uEOQhTPDVcULtjpZ2M9UeX9PAv3n9mLi3nvkyXSMLcbzph7f0Lb70lk=@vger.kernel.org X-Gm-Message-State: AOJu0YxjamFwnLon9Iqa2AT448482TrlbVsQteEgN1XY3zcLGX08bnCg +DeuhRcPpVJFUaeun4VA7oRg5rJOw8uJdDHiPFWT72FUNlhcNKCFWUXa X-Gm-Gg: AY/fxX4q9PegCUfi6zel46aXyjpN3BKRxG3kMUtfouTryCurbeweMMB4YugOhFsFRNL 5Q9Pqhl0RfOR+HnziPuGVv/dz3AoNBof9EejVDCq3HjR4JrMM6CeKGEaaDIvJIr/JNCdAtBGlzX CoE8KaMh2j5QxgTSDpnG2sF3iF+LvoGY47frhzWCaeLJS6T3vBTG37ZVnVP+pzqNRQpxaanm64n Dwws6fXS8mS4JAbrj9MJH6YoMd7shSeKkdy8JlF32vIixUSzlR53nfafGo5Ue+D8PW6uxbr2MXB tcNijhDVnlRaFwEIsIj6img9QKeLA6/WHMsuK63Y8ek+hvPWQnZKwyO3c9wPjhauGnwD4pwCkJ3 9tCK0pib2vqIqpjCThiyhabGwn0SfiZSaVFcrNUM87bZ6F1TlPgIgfA2/6bNw6q9QDYFTe4lQ1p i4f8kCUoW3wd9IETlfyFrZbngfDKYYOXW4gQfwu+gjlMm5MtqCgbE= X-Google-Smtp-Source: AGHT+IFpoVFVoGdds3xWS4nCVuXAsQ9kuPwMMvakRoZvNm0Y5y6VuK7Us5eEf+GT7UsIy7axfy9yIg== X-Received: by 2002:a05:600c:4e49:b0:471:13dd:bae7 with SMTP id 5b1f17b1804b1-47d195911b8mr125877655e9.30.1766491866369; Tue, 23 Dec 2025 04:11:06 -0800 (PST) Received: from pumpkin (host-2-103-239-165.as13285.net. [2.103.239.165]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47d193e329asm239696985e9.15.2025.12.23.04.11.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Dec 2025 04:11:05 -0800 (PST) Date: Tue, 23 Dec 2025 12:11:04 +0000 From: David Laight To: Li Wang Cc: Andrew Morton , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, David Hildenbrand , Mark Brown , Shuah Khan , Waiman Long Subject: Re: [PATCH v3 1/3] selftests/mm/write_to_hugetlbfs: parse -s as size_t Message-ID: <20251223121104.6614c1e3@pumpkin> In-Reply-To: References: <20251221122639.3168038-1-liwang@redhat.com> <20251221122639.3168038-2-liwang@redhat.com> <20251221221052.3b769fc2@pumpkin> <20251222094828.2783d9e5@pumpkin> <20251222180509.b12684e112195ac3f7ee9389@linux-foundation.org> <20251223084035.67ba1b76@pumpkin> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 23 Dec 2025 17:29:38 +0800 Li Wang wrote: > David Laight wrote: > > > What was wrong with atoi() ? > > As the patch summary described, write_to_hugetlbfs previously parsed -s via > atoi() into an int, which can overflow and print negative sizes. This > problem was > found on our kernel-64k platform and > > #./charge_reserved_hugetlb.sh -cgroup-v2 > # ----------------------------------------- > ... > # nr hugepages = 10 > # writing cgroup limit: 5368709120 > # writing reseravation limit: 5368709120 > ... > # Writing to this path: /mnt/huge/test > # Writing this size: -1610612736 <-------- So the problem was that atoi() doesn't let you specify valid values over 2GB. That isn't how I read the patch summary. It read as though you were worried about detecting invalid input. David