From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f197.google.com (mail-pf1-f197.google.com [209.85.210.197]) (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 8DEC93A9618 for ; Thu, 6 Aug 2026 01:12:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785978756; cv=none; b=CnZ1S31pFVxiv+hoqeb5Q9pcJVyXqMbgzStkxwImLAM1WfOQ+J444lRLVwnaPzjRpx6h096D6oREH1ujgkv34AgR+PNnK5F5JAXNSz4rXs5nFOojislcpO/0G+k8gWEhCi8b1DNs6i/cMVyKijo3s0qPbHDegpp4w85LYFifupI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785978756; c=relaxed/simple; bh=8JO27Ri6DA3uKFxW+PXk1PVmS/7s6WvHUElM3I1QKmI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=q/cSHeDSyKwqgXr+tGfVFnoXr7SmRukIY3KQVniqF5LnS0MEd8yxWuR+3n6dWC+IlyJ5aQRBuaY1I54MpRiyjbVdTGMA0UInIKUXBUf572JW7kZ6ohC8HupiljPTYknjAfqFS3WqMneCOzi7ixGB1bPNlj/SshIM75W4bkPqQyc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=R9ZKNrw9; arc=none smtp.client-ip=209.85.210.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="R9ZKNrw9" Received: by mail-pf1-f197.google.com with SMTP id d2e1a72fcca58-84870e7f498so1776869b3a.3 for ; Wed, 05 Aug 2026 18:12:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785978755; x=1786583555; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=TMQCLZS6DH1nuKj6XZQA4CCWO5WJygqkZvtHLpH3qzU=; b=R9ZKNrw9z9F5/aNL792SR+zsjxkK0cl3bd9T6VuVhvWHDCtd6Ak2tskYHiaC3VhXre 7O1wu8TpzSVcPkAymPio2DiuEZGXSvankeCIeo843/SK29ePLqBmggKSAE/39uI8j7Xb w7VmEV9KHa0gsFtEwGhNLc5aNv7PxfLcoh7aD9hlPrmJKmtPKqi9w1w2S2Gf1v8ZySrT f4Xo7w4GMci7BtG6lxpWzTqT5uThHcS4dD7ArGiKoGHOJ089UXwDonQf2HotE4o9Jaru ARXO+MmUvBcsOKd+znv/wS26nT0E6WuCyMbldfnH2zkndgHgDmMLnn3lZ6gZBAOa9kXC qRMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785978755; x=1786583555; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=TMQCLZS6DH1nuKj6XZQA4CCWO5WJygqkZvtHLpH3qzU=; b=Y1kRQtwqST3LdFnZnQ1Zmjwwv17sefyaOp0sACxQf75w55j1cfL9uGKT8CCoOopbph Zlgk8tRJiI/+W3Q+qKw3xm78jka0jBH0pV9GHcqD6vXFkl+NtFFVZLje0yPljogHVH1h yg+nzYZPJLpIOBKuxNCsafV6VCpk7JKsI4FmvzRNkzbgfrFjqUZ9X7AY+JJCxhjaaoix J4GgEQD/WuCKMjfVJ0Ca0sKBmYxVOop8ls+dVMlvhlccrw5pEc6AhKUTrxvCidI059hQ iJoqdGJmdztkr5IGnjbGL0/c/gGpydWpcH079Q3mD5J/PbfrU7xWHl0QNeH+geWtszb9 pQLw== X-Forwarded-Encrypted: i=1; AHgh+RpZg8eJ9NXgSozJjJiPIkEGs5qjXReReP5dm4ApLY+1r26or37z13KwBzIFf+kKWE6hQga/scNscJBCkkY=@vger.kernel.org X-Gm-Message-State: AOJu0YxOL2DR2kdKKAxt/diSbElXD2ltScWUQ8IxECtkVMJ2QKDiLa/h SfF9O+TgnioGiP2z7gDnvwkwcbZq8w3G1PNqmsnOgPCZRcNWCnzcQDGz9/9wTFmmmTZ4t4Z8Mrz vhUkccBXGXg== X-Received: from pgkg21.prod.google.com ([2002:a63:fa55:0:b0:c7f:cbe1:2d84]) (user=jyescas job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:2e17:b0:847:8f7c:fa10 with SMTP id d2e1a72fcca58-84f2e12d04cmr11046682b3a.35.1785978754627; Wed, 05 Aug 2026 18:12:34 -0700 (PDT) Date: Wed, 5 Aug 2026 18:09:10 -0700 In-Reply-To: <20260806011048.517229-1-jyescas@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260806011048.517229-1-jyescas@google.com> X-Mailer: git-send-email 2.55.0.629.g250fe7f194-goog Message-ID: <20260806011048.517229-10-jyescas@google.com> Subject: [RFC PATCH v2 09/16] mm: Read the nr_pages_allocs value given by user From: Juan Yescas To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , open list , "open list:MEMORY MANAGEMENT - CORE" Cc: jyescas@google.com, android-mm@google.com, ljs@kernel.org, fvdl@google.com, tkjos@google.com, minchan@google.com, dskiba@google.com, open list , "open list:MEMORY MANAGEMENT - CORE" Content-Type: text/plain; charset="UTF-8" This change reads the nr_page_allocs value given by the user and validates that is an unsigned long. If the input is valid, it will allocate an array of nr_page_allocs size. This array will store the allocation ids. These allocation ids will be used to free the allocations. Signed-off-by: Juan Yescas --- Changes in v2: - Free allocs_ids. mm/page_alloc_hogger.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/mm/page_alloc_hogger.c b/mm/page_alloc_hogger.c index ded3f0fc6641..9b1eaf3814e1 100644 --- a/mm/page_alloc_hogger.c +++ b/mm/page_alloc_hogger.c @@ -135,6 +135,21 @@ static struct kmem_cache *page_alloc_cache; static ssize_t req_page_alloc_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { + unsigned long nr_pages_allocs; + unsigned long *allocs_ids; + int ret; + + ret = kstrtoul_from_user(ubuf, cnt, 10, &nr_pages_allocs); + if (ret) + return ret; + + allocs_ids = kmalloc_array(nr_pages_allocs, sizeof(unsigned long), + GFP_KERNEL); + if (!allocs_ids) + return -ENOMEM; + + kfree(allocs_ids); + return cnt; } -- 2.55.0.629.g250fe7f194-goog