From nobody Sun Feb 8 01:58:08 2026 Received: from mail-ed1-f45.google.com (mail-ed1-f45.google.com [209.85.208.45]) (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 820141F7573 for ; Thu, 14 Nov 2024 08:59:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731574779; cv=none; b=r94v5ov987DIgp1NYDApsOB4bhOpFnF/4pXjIcoi1v69JYJK1LzHrnLFtopBE3gnZ0ubiHDbJd+gBHtdWSIOtTv+l5ptqD6bTmFaBugvUkm/bGl0PEAjxT9j2JTW6dtaqt6JXaBpayNHr9rFzn5pR0fRKSAJpfVb8zD0IOKTx2E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731574779; c=relaxed/simple; bh=XycamBY/nYOgqAvwbffcnYn4/Yabq7JhXqCOkrXC1xo=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=kqikarhztBVZE4+rQSh/8nJINcf6c1hTIK8JJHSV8n6OsEUYP0k0n4dEANM6Yk46uZY7SVYDp1DhjG4I2QHMeR4EgsUR9rYDUN1W5vBgVp1IiMpRethkhQbb4ZlQSr0Kygz5LbPy3RBvjiROsHgTd3PNGgQWrkfwGU8BYYlBwhA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=jNbFXWb7; arc=none smtp.client-ip=209.85.208.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="jNbFXWb7" Received: by mail-ed1-f45.google.com with SMTP id 4fb4d7f45d1cf-5cf7aadc8b7so239638a12.1 for ; Thu, 14 Nov 2024 00:59:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1731574776; x=1732179576; darn=vger.kernel.org; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=RFvv3LbF9Kdg9CtKKlONGsxCX12ovGg602Za7rDJdl8=; b=jNbFXWb7jcm+CDw7YVEZz23nl4UM1utKC5g3fqOHWPXKBMO0zc9aZ89LoDGSm9se1r cK2tPrK5YvrJJ6nFOSMXEamgQTC7+6HczQZOAvkwO5O4+dn+tKblhZJtiaKiVOazbgEX xadz47PXFUddSC/bEQWU/uR3dekqmuqZLEpxTgAsZwXdDbXLnYWOJ24DgrVm6+To9Myu y4I3y7TwIkULbdQQRRhtYpExJtqtc8brkAI+NdbgXPHPTyqqUKt9LhfqqWlR2RHKig/x 0Ts2fEP2bKzcTRYZ/0Ist/ixEJR1vw30RHzkbjDq4sqXE9SZ7VimomJpiFIyUUW86IKl grJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731574776; x=1732179576; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=RFvv3LbF9Kdg9CtKKlONGsxCX12ovGg602Za7rDJdl8=; b=KTG3oMBuVIlSMk81wNl3dl14PmIiMexnU9bazI4ZWn8Y7yYX+q7xvgfEqLjwGmNqXx zhiLGseohkUVTj8B0fqJVK97nHjCWT0UBzjfzJGabayn/ZE4Sr8bk1t3T+CQpz2vsBOj mglouMN4bHBZcl20hAIk9IdJjV/VM9gBpE9ht91u1QVYLTfWWWcxUguD8ninuOGVKUsh rGsQxDIK3/IOExzE6lA26S3adi5StQAorp3Wi2wCk8/aUNcCRAoO0Ot1FtkTZTsEBlTM O+uSRi9aIo5Y/aau6XSxwl/YTG5pLPGZMtDreCRC5NUzXuz9TkDLPXH5vblDHAyeu4hl JhNw== X-Forwarded-Encrypted: i=1; AJvYcCUXtcDTMNh65EyhMt+p6zygZ6/qtIGVx5qzykv0+I3+RPFlZKC/hXZsumjQ6k8d8hHVMviO2dxvBb3YAEk=@vger.kernel.org X-Gm-Message-State: AOJu0Yx+Xo3SaP8XO64H0R3d0y1B/KjAwe238NB0WuFXPrDIVeBjQ1HA ZIT8kGbMYHauQMJJPJ2SZtV9kZIuJtSbxT6TliuYgBWoLE5Q1b7/+ZcEEqTWi7o= X-Google-Smtp-Source: AGHT+IERWfaAqNKqw9yYfROoHVQjEmjB8jy1fnYHJoHTg2lYc4YgdDb9SwWLsbU0fU1K76xN3CY0pw== X-Received: by 2002:a05:6402:40d0:b0:5ca:da2:b2ca with SMTP id 4fb4d7f45d1cf-5cf630c4fc0mr5133838a12.19.1731574775753; Thu, 14 Nov 2024 00:59:35 -0800 (PST) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aa20df56b13sm38701066b.76.2024.11.14.00.59.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 00:59:35 -0800 (PST) Date: Thu, 14 Nov 2024 11:59:32 +0300 From: Dan Carpenter To: Muhammad Usama Anjum Cc: Andrew Morton , David Hildenbrand , Matthew Wilcox , Oscar Salvador , Andrii Nakryiko , Ryan Roberts , Peter Xu , =?utf-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= , Andrei Vagin , Arnd Bergmann , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] fs/proc/task_mmu: prevent integer overflow in pagemap_scan_get_args() Message-ID: <39d41335-dd4d-48ed-8a7f-402c57d8ea84@stanley.mountain> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The "arg->vec_len" variable is a u64 that comes from the user at the start of the function. The "arg->vec_len * sizeof(struct page_region))" multiplication can lead to integer wrapping. Use size_mul() to avoid that. Also the size_add/mul() functions work on unsigned long so for 32bit systems we need to ensure that "arg->vec_len" fits in an unsigned long. Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optional= ly clear info about PTEs") Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter Acked-by: Andrei Vagin --- fs/proc/task_mmu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index f57ea9b308bb..38a5a3e9cba2 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2665,8 +2665,10 @@ static int pagemap_scan_get_args(struct pm_scan_arg = *arg, return -EFAULT; if (!arg->vec && arg->vec_len) return -EINVAL; + if (UINT_MAX =3D=3D SIZE_MAX && arg->vec_len > SIZE_MAX) + return -EINVAL; if (arg->vec && !access_ok((void __user *)(long)arg->vec, - arg->vec_len * sizeof(struct page_region))) + size_mul(arg->vec_len, sizeof(struct page_region)))) return -EFAULT; =20 /* Fixup default values */ --=20 2.45.2