From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37B4FC388F7 for ; Tue, 3 Nov 2020 12:25:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5DA1223BF for ; Tue, 3 Nov 2020 12:25:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604406357; bh=KWUmPwundgVkVEk/OQ3Y+wsrUv9fJjCsHAy5ysTmpJw=; h=Subject:To:Cc:From:Date:List-ID:From; b=Xg/Rwns/YpTVyLKTk0z///WetEQq0KQSkDugbJ33UY1LEX61iKMM0SfNCu8er69l0 OnINkLaOmHFPqEUaKcR/1boANTREaCsIK0QXS8gFDJZRCQEWs2M0fgiD8IeSoQF/DX in4FBdcjf0JdbHAz3Vrh7nnegIzZ2N/edwPf7kqM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728214AbgKCMZ4 (ORCPT ); Tue, 3 Nov 2020 07:25:56 -0500 Received: from wforward3-smtp.messagingengine.com ([64.147.123.22]:34397 "EHLO wforward3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728168AbgKCMZ4 (ORCPT ); Tue, 3 Nov 2020 07:25:56 -0500 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailforward.west.internal (Postfix) with ESMTP id CD2BCC57; Tue, 3 Nov 2020 07:25:54 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Tue, 03 Nov 2020 07:25:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=fNk2zb dtg2we3Y4qyeF7X3GsU5cV/4tQsDjDa26kjuE=; b=dNIMENX2U6VgIKd7EUYpxB h1AHgXz5OmLK/BO0t8Dm9n89IXeoY2/tNOPNGqKmnNilALtvfG36yesHXVhoz/Tk 5NGcwpwmGQD30Ub6XkhjsudSzQf0q7uOjynyDOLZo3xVRmocvdcc+PzWt7U08v71 Bos3Kce7O4/ZMwjUjUng/x/xoICDYJoTkjdmTwHLT6lxDFnBEj/EReBK5Lv/AzCN 8aVEKohgMKrcGvXA9yLJsv/BJARhXi4F2mhoPAOr6wQvmRsdxlWcQnSTas799Lut sUSJA+iz1OLl3jRDR4BPGO7glz4jZuZI0JlX86W7RXqIHLx/neESwlYw+vQnoDPw == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedujedruddtfedgfeelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefuvffhfffkgggtgfesthekredttd dtlfenucfhrhhomhepoehgrhgvghhkhheslhhinhhugihfohhunhgurghtihhonhdrohhr gheqnecuggftrfgrthhtvghrnhepleelledvgeefleeltdetgedugeffgffhudffudduke egfeelgeeigeekjefhleevnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghenucfkphep keefrdekiedrjeegrdeigeenucevlhhushhtvghrufhiiigvpedunecurfgrrhgrmhepmh grihhlfhhrohhmpehgrhgvgheskhhrohgrhhdrtghomh X-ME-Proxy: Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) by mail.messagingengine.com (Postfix) with ESMTPA id A105D328005E; Tue, 3 Nov 2020 07:25:53 -0500 (EST) Subject: FAILED: patch "[PATCH] fs/kernel_read_file: Remove FIRMWARE_PREALLOC_BUFFER enum" failed to apply to 4.19-stable tree To: keescook@chromium.org, gregkh@linuxfoundation.org, mcgrof@kernel.org, scott.branden@broadcom.com, zohar@linux.ibm.com Cc: From: Date: Tue, 03 Nov 2020 13:26:40 +0100 Message-ID: <160440640045225@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From c307459b9d1fcb8bbf3ea5a4162979532322ef77 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Fri, 2 Oct 2020 10:38:13 -0700 Subject: [PATCH] fs/kernel_read_file: Remove FIRMWARE_PREALLOC_BUFFER enum FIRMWARE_PREALLOC_BUFFER is a "how", not a "what", and confuses the LSMs that are interested in filtering between types of things. The "how" should be an internal detail made uninteresting to the LSMs. Fixes: a098ecd2fa7d ("firmware: support loading into a pre-allocated buffer") Fixes: fd90bc559bfb ("ima: based on policy verify firmware signatures (pre-allocated buffer)") Fixes: 4f0496d8ffa3 ("ima: based on policy warn about loading firmware (pre-allocated buffer)") Signed-off-by: Kees Cook Reviewed-by: Mimi Zohar Reviewed-by: Luis Chamberlain Acked-by: Scott Branden Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20201002173828.2099543-2-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 63b9714a0154..b0ec2721f55d 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -470,14 +470,12 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv, int i, len; int rc = -ENOENT; char *path; - enum kernel_read_file_id id = READING_FIRMWARE; size_t msize = INT_MAX; void *buffer = NULL; /* Already populated data member means we're loading into a buffer */ if (!decompress && fw_priv->data) { buffer = fw_priv->data; - id = READING_FIRMWARE_PREALLOC_BUFFER; msize = fw_priv->allocated_size; } @@ -501,7 +499,8 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv, /* load firmware files from the mount namespace of init */ rc = kernel_read_file_from_path_initns(path, &buffer, - &size, msize, id); + &size, msize, + READING_FIRMWARE); if (rc) { if (rc != -ENOENT) dev_warn(device, "loading %s failed with error %d\n", diff --git a/fs/exec.c b/fs/exec.c index a91003e28eaa..9233cd50dc4c 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -954,6 +954,7 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size, { loff_t i_size, pos; ssize_t bytes = 0; + void *allocated = NULL; int ret; if (!S_ISREG(file_inode(file)->i_mode) || max_size < 0) @@ -977,8 +978,8 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size, goto out; } - if (id != READING_FIRMWARE_PREALLOC_BUFFER) - *buf = vmalloc(i_size); + if (!*buf) + *buf = allocated = vmalloc(i_size); if (!*buf) { ret = -ENOMEM; goto out; @@ -1007,7 +1008,7 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size, out_free: if (ret < 0) { - if (id != READING_FIRMWARE_PREALLOC_BUFFER) { + if (allocated) { vfree(*buf); *buf = NULL; } diff --git a/include/linux/fs.h b/include/linux/fs.h index 7519ae003a08..7336e22d0c5d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2858,10 +2858,10 @@ static inline void i_readcount_inc(struct inode *inode) #endif extern int do_pipe_flags(int *, int); +/* This is a list of *what* is being read, not *how*. */ #define __kernel_read_file_id(id) \ id(UNKNOWN, unknown) \ id(FIRMWARE, firmware) \ - id(FIRMWARE_PREALLOC_BUFFER, firmware) \ id(FIRMWARE_EFI_EMBEDDED, firmware) \ id(MODULE, kernel-module) \ id(KEXEC_IMAGE, kexec-image) \ diff --git a/kernel/module.c b/kernel/module.c index 1c5cff34d9f2..b2808acac46b 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -4035,7 +4035,7 @@ SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) { struct load_info info = { }; loff_t size; - void *hdr; + void *hdr = NULL; int err; err = may_init_module(); diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index e9cbadade74b..ac02b7632353 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -169,7 +169,7 @@ int __init integrity_add_key(const unsigned int id, const void *data, int __init integrity_load_x509(const unsigned int id, const char *path) { - void *data; + void *data = NULL; loff_t size; int rc; key_perm_t perm; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index e3fcad871861..15a44c5022f7 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -272,7 +272,7 @@ static const struct file_operations ima_ascii_measurements_ops = { static ssize_t ima_read_policy(char *path) { - void *data; + void *data = NULL; char *datap; loff_t size; int rc, pathlen = strlen(path); diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 8a91711ca79b..2f187784c5bc 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -611,19 +611,17 @@ void ima_post_path_mknod(struct dentry *dentry) int ima_read_file(struct file *file, enum kernel_read_file_id read_id) { /* - * READING_FIRMWARE_PREALLOC_BUFFER - * * Do devices using pre-allocated memory run the risk of the * firmware being accessible to the device prior to the completion * of IMA's signature verification any more than when using two - * buffers? + * buffers? It may be desirable to include the buffer address + * in this API and walk all the dma_map_single() mappings to check. */ return 0; } const int read_idmap[READING_MAX_ID] = { [READING_FIRMWARE] = FIRMWARE_CHECK, - [READING_FIRMWARE_PREALLOC_BUFFER] = FIRMWARE_CHECK, [READING_MODULE] = MODULE_CHECK, [READING_KEXEC_IMAGE] = KEXEC_KERNEL_CHECK, [READING_KEXEC_INITRAMFS] = KEXEC_INITRAMFS_CHECK,