From patchwork Fri Jul 7 08:34:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 13304569 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80E67EB64DA for ; Fri, 7 Jul 2023 08:35:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229847AbjGGIfK (ORCPT ); Fri, 7 Jul 2023 04:35:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232149AbjGGIfH (ORCPT ); Fri, 7 Jul 2023 04:35:07 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54A4190 for ; Fri, 7 Jul 2023 01:35:06 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id CF835618D6 for ; Fri, 7 Jul 2023 08:35:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F32CC433CB; Fri, 7 Jul 2023 08:35:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688718905; bh=oiYrnd4ySIqldKS+u2X0VFEizpwtcI7ZUrv3YQwVCmw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jj4T9nFVLxY/RWPHxWK+D/1i9CNnq7VSfeXcQg/bClWQIkMqcF09apsK/4lXiea1o NNXIXMHrxepR+Rrc0F6YbVFhVlsT+ew/cufN7THGApcsEtbZXrfFvGwu2KWuSgDJfd jO3vCm73Ccpw/rsAGCHMteFeFCPb+teoXd+oIWoeb8W5wJBt1T6R9WrhzGX27w1073 FJtTnhMwZQqfW/D2re4BjxcW/o5oBILc9ECIuOUjlgS5YtQhjUeCfElP0CZ6HXcC3L Th4iEs12Lu+oML2IMs37gTb+VWB62AcLyhEw6JBMzGMKIAJ8MUiI6qeYt62VHvjqKX jMhNfmh9n5vHg== From: Ard Biesheuvel To: linux-hardening@vger.kernel.org Cc: Ard Biesheuvel , Kees Cook , "Guilherme G. Piccoli" , Eric Biggers Subject: [PATCH v2 2/2] pstore: Replace crypto API compression with zlib_deflate library calls Date: Fri, 7 Jul 2023 10:34:56 +0200 Message-Id: <20230707083456.2501913-3-ardb@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230707083456.2501913-1-ardb@kernel.org> References: <20230707083456.2501913-1-ardb@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=13268; i=ardb@kernel.org; h=from:subject; bh=oiYrnd4ySIqldKS+u2X0VFEizpwtcI7ZUrv3YQwVCmw=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIWX5Of2rzfzH7i73i14eYhX92zx22dIz0bHfnGOmL9fXm h7yVNiwo5SFQYyDQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEwk7gsjw0K7BU9rsy737tsh FHPf9sLNhZ13r4QptjlpBbPn3fxY8IThn+53x/LC6U5NXl/rpt5NMX0eeJ5L3Iy1+PUTbi1l76C LjAA= X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Pstore supports compression using a variety of algorithms exposed by the crypto API. This uses the deprecated comp (as opposed to scomp/acomp) API, and so we should stop using that, and either move to the new API, or switch to a different approach entirely. Given that we only compress ASCII text in pstore, and considering that this happens when the system is likely to be in an unstable state, the flexibility that the complex crypto API provides does not outweigh its impact on the risk that we might encounter additional problems when trying to commit the kernel log contents to the pstore backend. So let's switch [back] to the zlib deflate library API, and remove all the complexity that really has no place in a low-level diagnostic facility. Note that, while more modern compression algorithms have been added to the kernel in recent years, the code size of zlib deflate is substantially smaller than, e.g., zstd, while its performance in terms of compression ratio is better than most for ASCII text, and speed is deemed irrelevant in this context. Note that this means that compressed pstore records may no longer be accessible after a kernel upgrade, but this has never been part of the contract. (The choice of compression algorithm is not stored in the pstore records either) Signed-off-by: Ard Biesheuvel --- fs/pstore/Kconfig | 100 ++------------- fs/pstore/platform.c | 131 +++++++++++++------- 2 files changed, 92 insertions(+), 139 deletions(-) diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig index c49d554cc9ae9f80..3acc38600cd1a2d0 100644 --- a/fs/pstore/Kconfig +++ b/fs/pstore/Kconfig @@ -1,7 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only config PSTORE tristate "Persistent store support" - select CRYPTO if PSTORE_COMPRESS default n help This option enables generic access to platform level @@ -22,99 +21,18 @@ config PSTORE_DEFAULT_KMSG_BYTES Defines default size of pstore kernel log storage. Can be enlarged if needed, not recommended to shrink it. -config PSTORE_DEFLATE_COMPRESS - tristate "DEFLATE (ZLIB) compression" - default y - depends on PSTORE - select CRYPTO_DEFLATE - help - This option enables DEFLATE (also known as ZLIB) compression - algorithm support. - -config PSTORE_LZO_COMPRESS - tristate "LZO compression" - depends on PSTORE - select CRYPTO_LZO - help - This option enables LZO compression algorithm support. - -config PSTORE_LZ4_COMPRESS - tristate "LZ4 compression" - depends on PSTORE - select CRYPTO_LZ4 - help - This option enables LZ4 compression algorithm support. - -config PSTORE_LZ4HC_COMPRESS - tristate "LZ4HC compression" - depends on PSTORE - select CRYPTO_LZ4HC - help - This option enables LZ4HC (high compression) mode algorithm. - -config PSTORE_842_COMPRESS - bool "842 compression" - depends on PSTORE - select CRYPTO_842 - help - This option enables 842 compression algorithm support. - -config PSTORE_ZSTD_COMPRESS - bool "zstd compression" - depends on PSTORE - select CRYPTO_ZSTD - help - This option enables zstd compression algorithm support. - config PSTORE_COMPRESS - def_bool y + bool "Pstore compression (deflate)" depends on PSTORE - depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \ - PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \ - PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS - -choice - prompt "Default pstore compression algorithm" - depends on PSTORE_COMPRESS + select ZLIB_INFLATE + select ZLIB_DEFLATE + default y help - This option chooses the default active compression algorithm. - This change be changed at boot with "pstore.compress=..." on - the kernel command line. - - Currently, pstore has support for 6 compression algorithms: - deflate, lzo, lz4, lz4hc, 842 and zstd. - - The default compression algorithm is deflate. - - config PSTORE_DEFLATE_COMPRESS_DEFAULT - bool "deflate" if PSTORE_DEFLATE_COMPRESS - - config PSTORE_LZO_COMPRESS_DEFAULT - bool "lzo" if PSTORE_LZO_COMPRESS - - config PSTORE_LZ4_COMPRESS_DEFAULT - bool "lz4" if PSTORE_LZ4_COMPRESS - - config PSTORE_LZ4HC_COMPRESS_DEFAULT - bool "lz4hc" if PSTORE_LZ4HC_COMPRESS - - config PSTORE_842_COMPRESS_DEFAULT - bool "842" if PSTORE_842_COMPRESS - - config PSTORE_ZSTD_COMPRESS_DEFAULT - bool "zstd" if PSTORE_ZSTD_COMPRESS - -endchoice - -config PSTORE_COMPRESS_DEFAULT - string - depends on PSTORE_COMPRESS - default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT - default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT - default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT - default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT - default "842" if PSTORE_842_COMPRESS_DEFAULT - default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT + Whether pstore records should be compressed before being written to + the backing store. This is implemented using the zlib 'deflate' + algorithm, using the library implementation instead of using the full + blown crypto API. This reduces the risk of secondary oopses or other + problems while pstore is recording panic metadata. config PSTORE_CONSOLE bool "Log kernel console messages" diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 52d7b438c4882a43..9a0db551e8af67fa 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -16,13 +16,14 @@ #include #include #include -#include #include #include #include #include #include +#include #include +#include #include "internal.h" @@ -71,12 +72,22 @@ static char *backend; module_param(backend, charp, 0444); MODULE_PARM_DESC(backend, "specific backend to use"); -static char *compress = -#ifdef CONFIG_PSTORE_COMPRESS_DEFAULT - CONFIG_PSTORE_COMPRESS_DEFAULT; -#else - NULL; -#endif +/* + * pstore no longer implements compression via the crypto API, and only + * supports zlib deflate compression implemented using the zlib library + * interface. This removes additional complexity which is hard to justify for a + * diagnostic facility that has to operate in conditions where the system may + * have become unstable. Zlib deflate is comparatively small in terms of code + * size, and compresses ASCII text as well as any other compression algorithm + * available in the kernel. In terms of compression speed, deflate is not the + * best performer but for recording the log output on a kernel panic, this is + * not considered critical. + * + * The only remaining arguments supported by the compress= module parameter are + * 'deflate' and 'none'. To retain compatibility with existing installations, + * all other values are logged and replaced with 'deflate'. + */ +static char *compress = "deflate"; module_param(compress, charp, 0444); MODULE_PARM_DESC(compress, "compression to use"); @@ -85,8 +96,7 @@ unsigned long kmsg_bytes = CONFIG_PSTORE_DEFAULT_KMSG_BYTES; module_param(kmsg_bytes, ulong, 0444); MODULE_PARM_DESC(kmsg_bytes, "amount of kernel log to snapshot (in bytes)"); -/* Compression parameters */ -static struct crypto_comp *tfm; +static void *compress_workspace; static char *big_oops_buf; @@ -156,36 +166,49 @@ static bool pstore_cannot_block_path(enum kmsg_dump_reason reason) static int pstore_compress(const void *in, void *out, unsigned int inlen, unsigned int outlen) { + struct z_stream_s zstream = { + .next_in = in, + .avail_in = inlen, + .next_out = out, + .avail_out = outlen, + .workspace = compress_workspace, + }; int ret; if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS)) return -EINVAL; - ret = crypto_comp_compress(tfm, in, inlen, out, &outlen); - if (ret) { - pr_err("crypto_comp_compress failed, ret = %d!\n", ret); - return ret; - } + ret = zlib_deflateInit2(&zstream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, + -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY); + if (ret != Z_OK) + return -EINVAL; - return outlen; + ret = zlib_deflate(&zstream, Z_FINISH); + if (ret != Z_STREAM_END) + return -EINVAL; + + ret = zlib_deflateEnd(&zstream); + if (ret != Z_OK) + pr_warn_once("zlib_deflateEnd() failed: %d\n", ret); + + return zstream.total_out; } static void allocate_buf_for_compression(void) { - struct crypto_comp *ctx; char *buf; - /* Skip if not built-in or compression backend not selected yet. */ - if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS) || !compress) + /* Skip if not built-in or compression disabled. */ + if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS) || !compress || + !strcmp(compress, "none")) { + compress = NULL; return; + } - /* Skip if no pstore backend yet or compression init already done. */ - if (!psinfo || tfm) - return; - - if (!crypto_has_comp(compress, 0, 0)) { - pr_err("Unknown compression: %s\n", compress); - return; + if (strcmp(compress, "deflate")) { + pr_err("Unsupported compression '%s', falling back to deflate\n", + compress); + compress = "deflate"; } /* Worst-case compression should never be more than uncompressed. */ @@ -196,16 +219,15 @@ static void allocate_buf_for_compression(void) return; } - ctx = crypto_alloc_comp(compress, 0, 0); - if (IS_ERR_OR_NULL(ctx)) { + compress_workspace = + vmalloc(zlib_deflate_workspacesize(MAX_WBITS, DEF_MEM_LEVEL)); + if (!compress_workspace) { + pr_err("Failed to allocate zlib deflate workspace\n"); kfree(buf); - pr_err("crypto_alloc_comp('%s') failed: %ld\n", compress, - PTR_ERR(ctx)); return; } /* A non-NULL big_oops_buf indicates compression is available. */ - tfm = ctx; big_oops_buf = buf; pr_info("Using crash dump compression: %s\n", compress); @@ -213,10 +235,7 @@ static void allocate_buf_for_compression(void) static void free_buf_for_compression(void) { - if (IS_ENABLED(CONFIG_PSTORE_COMPRESS) && tfm) { - crypto_free_comp(tfm); - tfm = NULL; - } + vfree(compress_workspace); kfree(big_oops_buf); big_oops_buf = NULL; } @@ -527,7 +546,8 @@ void pstore_unregister(struct pstore_info *psi) } EXPORT_SYMBOL_GPL(pstore_unregister); -static void decompress_record(struct pstore_record *record) +static void decompress_record(struct pstore_record *record, + struct z_stream_s *zstream) { int ret; int unzipped_len; @@ -548,21 +568,32 @@ static void decompress_record(struct pstore_record *record) return; } + ret = zlib_inflateReset(zstream); + if (ret != Z_OK) { + pr_err("zlib_inflateReset() failed, ret = %d!\n", ret); + return; + } + /* Allocate enough space to hold max decompression and ECC. */ workspace = kmalloc(psinfo->bufsize + record->ecc_notice_size, GFP_KERNEL); if (!workspace) return; - /* After decompression "unzipped_len" is almost certainly smaller. */ - ret = crypto_comp_decompress(tfm, record->buf, record->size, - workspace, &unzipped_len); - if (ret) { - pr_err("crypto_comp_decompress failed, ret = %d!\n", ret); + zstream->next_in = record->buf; + zstream->avail_in = record->size; + zstream->next_out = workspace; + zstream->avail_out = psinfo->bufsize; + + ret = zlib_inflate(zstream, Z_FINISH); + if (ret != Z_STREAM_END) { + pr_err("zlib_inflate() failed, ret = %d!\n", ret); kfree(workspace); return; } + unzipped_len = zstream->total_out; + /* Append ECC notice to decompressed buffer. */ memcpy(workspace + unzipped_len, record->buf + record->size, record->ecc_notice_size); @@ -592,10 +623,17 @@ void pstore_get_backend_records(struct pstore_info *psi, { int failed = 0; unsigned int stop_loop = 65536; + struct z_stream_s zstream; if (!psi || !root) return; + if (IS_ENABLED(CONFIG_PSTORE_COMPRESS) && compress) { + zstream.workspace = kvmalloc(zlib_inflate_workspacesize(), + GFP_KERNEL); + zlib_inflateInit2(&zstream, -DEF_WBITS); + } + mutex_lock(&psi->read_mutex); if (psi->open && psi->open(psi)) goto out; @@ -624,7 +662,7 @@ void pstore_get_backend_records(struct pstore_info *psi, break; } - decompress_record(record); + decompress_record(record, &zstream); rc = pstore_mkfile(root, record); if (rc) { /* pstore_mkfile() did not take record, so free it. */ @@ -639,6 +677,10 @@ void pstore_get_backend_records(struct pstore_info *psi, psi->close(psi); out: mutex_unlock(&psi->read_mutex); + kvfree(zstream.workspace); + + if (zlib_inflateEnd(&zstream) != Z_OK) + pr_warn("zlib_inflateEnd() failed\n"); if (failed) pr_warn("failed to create %d record(s) from '%s'\n", @@ -667,13 +709,6 @@ static int __init pstore_init(void) { int ret; - /* - * Check if any pstore backends registered earlier but did not - * initialize compression because crypto was not ready. If so, - * initialize compression now. - */ - allocate_buf_for_compression(); - ret = pstore_init_fs(); if (ret) free_buf_for_compression();