From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8FC7D3D0921; Fri, 20 Mar 2026 22:41:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774046465; cv=none; b=hS4Zcgfj9ABwF1K+n4MHHM3GzBWB7ykkjs1RGB53BY85sd5iWRNn6jgn3DoRd9MMuHaDMDhYji4YSN/K2Y+VqMDTpGrvHrWx4P8CI7dZ8H0soG6YJUI4P/HXo4DYd8SB5ilBxCuPDQeA4s9T/bd3YCNsbeyqf3wlDiAcmp24S5M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774046465; c=relaxed/simple; bh=8qR80FHVrw1W7dNRTWXARimuDYTsH7/Z1DNv6yL8KUI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fmZGr6edWGtqZz0Xl77txGw6bZPoUNJqFF9CKtRZEcfdlnuOeQoCeF+/72oCgU2eX0MC9Nlj44Y3EyonxMChmQ3F31JWn0olGksZUbqTVmbIvBXomLg7PW6/lOW1Q8ehgHyhkhw6UxK1YD8eBYxhYtC7rgjmN7OsiRmhrtQiitM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y5lVmyuB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Y5lVmyuB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BA36C4CEF7; Fri, 20 Mar 2026 22:41:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774046465; bh=8qR80FHVrw1W7dNRTWXARimuDYTsH7/Z1DNv6yL8KUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y5lVmyuBl/YHtF0SUASv3ZsIQ1natPUk22znSNUOoj9GyIsqTvNjDfuA4n6b+bsdY 0IktpYP0BWJT+oAlqd91mH+ucfqkC0/or3yrh+9mqekZCcnZ68PC+3+GOlR+kG/Gqk qR3lrrIWipYfuWAhUod8000ikrQiwAYZOzekjarGe48HdLKV5DVaWMA5C5CGo49xdA LZZnpmr2iLBxtmHqo8tPDQrQ9okPRHfMxpwhKc1UaJ49bwA70Zc8q8d7EItWlI2LcM BcStZ6sq6rzSZ540KpAs0bxeFgzoEwLwBn4HNb9lYff6pOhtpLKVcI0Nxiz30+Upqb ALlXbBOZOjIoA== From: "Lorenzo Stoakes (Oracle)" To: Andrew Morton Cc: Jonathan Corbet , Clemens Ladisch , Arnd Bergmann , Greg Kroah-Hartman , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Alexander Shishkin , Maxime Coquelin , Alexandre Torgue , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Bodo Stroesser , "Martin K . Petersen" , David Howells , Marc Dionne , Alexander Viro , Christian Brauner , Jan Kara , David Hildenbrand , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, linux-staging@lists.linux.dev, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-afs@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Ryan Roberts Subject: [PATCH v4 21/21] mm: on remap assert that input range within the proposed VMA Date: Fri, 20 Mar 2026 22:39:47 +0000 Message-ID: <0fc1092f4b74f3f673a58e4e3942dc83f336dd85.1774045440.git.ljs@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Now we have range_in_vma_desc(), update remap_pfn_range_prepare() to check whether the input range in contained within the specified VMA, so we can fail at prepare time if an invalid range is specified. This covers the I/O remap mmap actions also which ultimately call into this function, and other mmap action types either already span the full VMA or check this already. Reviewed-by: Suren Baghdasaryan Signed-off-by: Lorenzo Stoakes (Oracle) --- mm/memory.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index 53ef8ef3d04a..68cc592ff0ba 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3142,6 +3142,9 @@ int remap_pfn_range_prepare(struct vm_area_desc *desc) const bool is_cow = vma_desc_is_cow_mapping(desc); int err; + if (!range_in_vma_desc(desc, start, end)) + return -EFAULT; + err = get_remap_pgoff(is_cow, start, end, desc->start, desc->end, pfn, &desc->pgoff); if (err) -- 2.53.0