From patchwork Thu Dec 13 19:43:56 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Steadmon X-Patchwork-Id: 10729707 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0281814E2 for ; Thu, 13 Dec 2018 19:44:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E90192C013 for ; Thu, 13 Dec 2018 19:44:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DCD3E2C086; Thu, 13 Dec 2018 19:44:07 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5933F2C013 for ; Thu, 13 Dec 2018 19:44:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729056AbeLMToG (ORCPT ); Thu, 13 Dec 2018 14:44:06 -0500 Received: from mail-yb1-f201.google.com ([209.85.219.201]:46163 "EHLO mail-yb1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728102AbeLMToF (ORCPT ); Thu, 13 Dec 2018 14:44:05 -0500 Received: by mail-yb1-f201.google.com with SMTP id c76so1672239ybf.13 for ; Thu, 13 Dec 2018 11:44:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=deF6YYtyZuaoJgFfRZj/QsQTuQgrUsxLt3Jc+6Yi1r4=; b=hnj3RNIDYbvyDxYJM8XSvqtCgmrAFP7D2F6OIABX6kBDFL6XHdW9pdKNdiX7neJloF ReWXEvJPqBSabZQX/zJu67UY9yjTil4zqYe3jC+KQst/X0vq+Xip4LTquVhD3NoLTsXU tqtBIAHCIxMjS9SfME8xyXIPidKqXRs4dl2VJ7lvdXh7o4jjgg9IM65ldWGDfNAI5QfB ZwMGqnQHMC6iMHhvAEZqmiSyZ0HueZPA4p4MDFPStX1IhS93ilR4HiyObPInfAczDvi3 PeqzHpa4Do/NUum3pheBsaRgRK5SkCnSKlmsIK8a1dIUm5fLfMW2I6enlxeUgrcWR7wM QU3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=deF6YYtyZuaoJgFfRZj/QsQTuQgrUsxLt3Jc+6Yi1r4=; b=QlF5/u42rNmLUeaYVtDiNiK7Hr+aJfMVrQiFZL2R+ZozKoSlq859dJ1uj+/YFj/Gxe F9VoHBhmFUdYQH+c25EctnNcTWu8ncsjap9r++0Rh3SiruoDbpayFU/GYb/aImrMv8sV V4bNO5i8UBiQxf8JQJ3S3TqenuV7LT+3bTX2U/2Io9TUHo+Ff29AlExwYrkBS2Bw5P5I 98tdT8Ubkio/LlVky5Z4eWf0YEbM9NV/Y/QUUW2jnYTtj81MKmogwIF4W4cHhSo3w6ZX cXmP6Mmin3kuObBzz02Y7MEc69uHpvQI9DwAaOueeK1C8NvUaRpgOT8CtkFWRBtI9AED ecsg== X-Gm-Message-State: AA+aEWbQUC3ixx/KzoJrU/LNRPQgrp1rQWbvuPMgcgWIuaSdnDAQvV8u xPfvEgExET7SUYbYMYLk5VgUubtZY04qaBtUOCtw8BtCPWQtBUvbDIwrdxBRJfJxbkjTek8bTZX UlLlhhbMqfKq9tHx5XWUIQ5z80bv6PTfDyrVZY6Ckc+tk4rni8Km4hd5oqDnbgjo= X-Google-Smtp-Source: AFSGD/Xz46f7oynWe9yUKIBlnj4GH8DpYz3x2lrWp46/JYWGJXh04TYJsMASdP5YWUD6Jkwu4vCR7uQ429x7cQ== X-Received: by 2002:a25:72c3:: with SMTP id n186-v6mr76440ybc.48.1544730245121; Thu, 13 Dec 2018 11:44:05 -0800 (PST) Date: Thu, 13 Dec 2018 11:43:56 -0800 In-Reply-To: Message-Id: <0b57ecbe1b6c72d95311ba1bb30ea1ed9fd7e3e5.1544729841.git.steadmon@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.20.0.rc2.403.gdbc3b29805-goog Subject: [PATCH v4 1/3] commit-graph, fuzz: Add fuzzer for commit-graph From: Josh Steadmon To: git@vger.kernel.org Cc: gitster@pobox.com, stolee@gmail.com, avarab@gmail.com, peff@peff.net, szeder.dev@gmail.com Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Breaks load_commit_graph_one() into a new function, parse_commit_graph(). The latter function operates on arbitrary buffers, which makes it suitable as a fuzzing target. Since parse_commit_graph() is only called by load_commit_graph_one() (and the fuzzer described below), we omit error messages that would be duplicated by the caller. Adds fuzz-commit-graph.c, which provides a fuzzing entry point compatible with libFuzzer (and possibly other fuzzing engines). Signed-off-by: Josh Steadmon --- .gitignore | 1 + Makefile | 1 + commit-graph.c | 53 ++++++++++++++++++++++++++++++--------------- commit-graph.h | 3 +++ fuzz-commit-graph.c | 16 ++++++++++++++ 5 files changed, 57 insertions(+), 17 deletions(-) create mode 100644 fuzz-commit-graph.c diff --git a/.gitignore b/.gitignore index 0d77ea5894..8bcf153ed9 100644 --- a/.gitignore +++ b/.gitignore @@ -1,3 +1,4 @@ +/fuzz-commit-graph /fuzz_corpora /fuzz-pack-headers /fuzz-pack-idx diff --git a/Makefile b/Makefile index 1a44c811aa..6b72f37c29 100644 --- a/Makefile +++ b/Makefile @@ -684,6 +684,7 @@ SCRIPTS = $(SCRIPT_SH_INS) \ ETAGS_TARGET = TAGS +FUZZ_OBJS += fuzz-commit-graph.o FUZZ_OBJS += fuzz-pack-headers.o FUZZ_OBJS += fuzz-pack-idx.o diff --git a/commit-graph.c b/commit-graph.c index 40c855f185..07dd410f3c 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -84,16 +84,10 @@ static int commit_graph_compatible(struct repository *r) struct commit_graph *load_commit_graph_one(const char *graph_file) { void *graph_map; - const unsigned char *data, *chunk_lookup; size_t graph_size; struct stat st; - uint32_t i; - struct commit_graph *graph; + struct commit_graph *ret; int fd = git_open(graph_file); - uint64_t last_chunk_offset; - uint32_t last_chunk_id; - uint32_t graph_signature; - unsigned char graph_version, hash_version; if (fd < 0) return NULL; @@ -108,27 +102,55 @@ struct commit_graph *load_commit_graph_one(const char *graph_file) die(_("graph file %s is too small"), graph_file); } graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0); + ret = parse_commit_graph(graph_map, fd, graph_size); + + if (!ret) { + munmap(graph_map, graph_size); + close(fd); + exit(1); + } + + return ret; +} + +struct commit_graph *parse_commit_graph(void *graph_map, int fd, + size_t graph_size) +{ + const unsigned char *data, *chunk_lookup; + uint32_t i; + struct commit_graph *graph; + uint64_t last_chunk_offset; + uint32_t last_chunk_id; + uint32_t graph_signature; + unsigned char graph_version, hash_version; + + if (!graph_map) + return NULL; + + if (graph_size < GRAPH_MIN_SIZE) + return NULL; + data = (const unsigned char *)graph_map; graph_signature = get_be32(data); if (graph_signature != GRAPH_SIGNATURE) { error(_("graph signature %X does not match signature %X"), graph_signature, GRAPH_SIGNATURE); - goto cleanup_fail; + return NULL; } graph_version = *(unsigned char*)(data + 4); if (graph_version != GRAPH_VERSION) { error(_("graph version %X does not match version %X"), graph_version, GRAPH_VERSION); - goto cleanup_fail; + return NULL; } hash_version = *(unsigned char*)(data + 5); if (hash_version != GRAPH_OID_VERSION) { error(_("hash version %X does not match version %X"), hash_version, GRAPH_OID_VERSION); - goto cleanup_fail; + return NULL; } graph = alloc_commit_graph(); @@ -152,7 +174,8 @@ struct commit_graph *load_commit_graph_one(const char *graph_file) if (chunk_offset > graph_size - GIT_MAX_RAWSZ) { error(_("improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32), (uint32_t)chunk_offset); - goto cleanup_fail; + free(graph); + return NULL; } switch (chunk_id) { @@ -187,7 +210,8 @@ struct commit_graph *load_commit_graph_one(const char *graph_file) if (chunk_repeated) { error(_("chunk id %08x appears multiple times"), chunk_id); - goto cleanup_fail; + free(graph); + return NULL; } if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP) @@ -201,11 +225,6 @@ struct commit_graph *load_commit_graph_one(const char *graph_file) } return graph; - -cleanup_fail: - munmap(graph_map, graph_size); - close(fd); - exit(1); } static void prepare_commit_graph_one(struct repository *r, const char *obj_dir) diff --git a/commit-graph.h b/commit-graph.h index 9db40b4d3a..813e7c19f1 100644 --- a/commit-graph.h +++ b/commit-graph.h @@ -54,6 +54,9 @@ struct commit_graph { struct commit_graph *load_commit_graph_one(const char *graph_file); +struct commit_graph *parse_commit_graph(void *graph_map, int fd, + size_t graph_size); + /* * Return 1 if and only if the repository has a commit-graph * file and generation numbers are computed in that file. diff --git a/fuzz-commit-graph.c b/fuzz-commit-graph.c new file mode 100644 index 0000000000..cf790c9d04 --- /dev/null +++ b/fuzz-commit-graph.c @@ -0,0 +1,16 @@ +#include "commit-graph.h" + +struct commit_graph *parse_commit_graph(void *graph_map, int fd, + size_t graph_size); + +int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size); + +int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) +{ + struct commit_graph *g; + + g = parse_commit_graph((void *)data, -1, size); + free(g); + + return 0; +} From patchwork Thu Dec 13 19:43:57 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Steadmon X-Patchwork-Id: 10729709 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CBBFD13AF for ; Thu, 13 Dec 2018 19:44:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BD48C2C013 for ; Thu, 13 Dec 2018 19:44:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B10FB2C086; Thu, 13 Dec 2018 19:44:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4E7392C013 for ; 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A simple bounds check in parse_commit_graph() prevents this. Signed-off-by: Josh Steadmon --- commit-graph.c | 14 ++++++++++++-- t/t5318-commit-graph.sh | 16 +++++++++++++--- 2 files changed, 25 insertions(+), 5 deletions(-) diff --git a/commit-graph.c b/commit-graph.c index 07dd410f3c..836d65a1d3 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -165,10 +165,20 @@ struct commit_graph *parse_commit_graph(void *graph_map, int fd, last_chunk_offset = 8; chunk_lookup = data + 8; for (i = 0; i < graph->num_chunks; i++) { - uint32_t chunk_id = get_be32(chunk_lookup + 0); - uint64_t chunk_offset = get_be64(chunk_lookup + 4); + uint32_t chunk_id; + uint64_t chunk_offset; int chunk_repeated = 0; + if (data + graph_size - chunk_lookup < + GRAPH_CHUNKLOOKUP_WIDTH) { + error(_("chunk lookup table entry missing; graph file may be incomplete")); + free(graph); + return NULL; + } + + chunk_id = get_be32(chunk_lookup + 0); + chunk_offset = get_be64(chunk_lookup + 4); + chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; if (chunk_offset > graph_size - GIT_MAX_RAWSZ) { diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh index 5fe21db99f..a1b5a75882 100755 --- a/t/t5318-commit-graph.sh +++ b/t/t5318-commit-graph.sh @@ -366,21 +366,26 @@ GRAPH_OCTOPUS_DATA_OFFSET=$(($GRAPH_COMMIT_DATA_OFFSET + \ GRAPH_BYTE_OCTOPUS=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4)) GRAPH_BYTE_FOOTER=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4 * $NUM_OCTOPUS_EDGES)) -# usage: corrupt_graph_and_verify +# usage: corrupt_graph_and_verify [] # Manipulates the commit-graph file at the position -# by inserting the data, then runs 'git commit-graph verify' +# by inserting the data, optionally zeroing the file +# starting at , then runs 'git commit-graph verify' # and places the output in the file 'err'. Test 'err' for # the given string. corrupt_graph_and_verify() { pos=$1 data="${2:-\0}" grepstr=$3 + orig_size=$(wc -c < $objdir/info/commit-graph) && + zero_pos=${4:-${orig_size}} && cd "$TRASH_DIRECTORY/full" && test_when_finished mv commit-graph-backup $objdir/info/commit-graph && cp $objdir/info/commit-graph commit-graph-backup && printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc && + dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=0 && + dd if=/dev/zero of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=$(($orig_size - $zero_pos)) && test_must_fail git commit-graph verify 2>test_err && - grep -v "^+" test_err >err + grep -v "^+" test_err >err && test_i18ngrep "$grepstr" err } @@ -484,6 +489,11 @@ test_expect_success 'detect invalid checksum hash' ' "incorrect checksum" ' +test_expect_success 'detect incorrect chunk count' ' + corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\377" \ + "chunk lookup table entry missing" $GRAPH_CHUNK_LOOKUP_OFFSET +' + test_expect_success 'git fsck (checks commit-graph)' ' cd "$TRASH_DIRECTORY/full" && git fsck && From patchwork Thu Dec 13 19:43:58 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Steadmon X-Patchwork-Id: 10729711 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1017F14E2 for ; Thu, 13 Dec 2018 19:44:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 02BAA2C013 for ; Thu, 13 Dec 2018 19:44:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EB3942C086; Thu, 13 Dec 2018 19:44:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A49932C013 for ; 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=uQ1jhi5AKwgWEkWw7YolYoka7re7J8A0znSfqW0qjMc=; b=Q5YWd0imS5dnuWkz+SvdgCUvYfO4yfbvzTrWXpO5aWm7nMYJbMRy0kS8wvu+KrJPta pe/VlgXYcSXxt2f+TeT6uzXwY2MlfblIKRPY0j2hKkkLZGxGn2aq5oZX5BtiNS4/+H0l 4S/dSy1NDjzT+K1X4Ir9qBGeMIDZzsigGogR6eV1nciU5mbJlBxalnvfw7mgFlOlmsmy N4kKhbObOk1NOjlqt78xzltsJ73eFe+gJaKMGR313LTmP6i+wWtO5juXGtIORmThxiK/ oAD8O1JTVVN+uZsRc3VK0jLp5fpj1Kp8x8yfISO83Pr20u34jQsFWedBc4BitcSmcqGl ksyg== X-Gm-Message-State: AA+aEWaUIUHJiuMqbLCyrxmNg30vhSpqEJuxuzJ1FCl1BIT4RlGjJwwH 3afH+LkWeqSSml/uGoJIvbkikwJWsPvEElVLPsCY5Gm3LX2fls19uRAfweezeYmnoG1u4ciJtI8 Lw9eq2y0FQtlz+f7A/W4cFkZ8p3vJNl76hS3y6d2yPiyJUYRZJg2Z5oUwyKnPMCY= X-Google-Smtp-Source: AFSGD/UFmkKOpidldAsE0CEhlvs4peU27i+Qk0lng/8eQk6045XCNz93BA5TkpZS1zFrGRNHt8MALS8bRPxqYg== X-Received: by 2002:a9d:66d9:: with SMTP id t25mr69339otm.59.1544730250090; Thu, 13 Dec 2018 11:44:10 -0800 (PST) Date: Thu, 13 Dec 2018 11:43:58 -0800 In-Reply-To: Message-Id: <21101b961ac602be766b6947143cf80d322e36c2.1544729841.git.steadmon@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.20.0.rc2.403.gdbc3b29805-goog Subject: [PATCH v4 3/3] Makefile: correct example fuzz build From: Josh Steadmon To: git@vger.kernel.org Cc: gitster@pobox.com, stolee@gmail.com, avarab@gmail.com, peff@peff.net, szeder.dev@gmail.com Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Josh Steadmon --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 6b72f37c29..bbcfc2bc9f 100644 --- a/Makefile +++ b/Makefile @@ -3104,7 +3104,7 @@ cover_db_html: cover_db # An example command to build against libFuzzer from LLVM 4.0.0: # # make CC=clang CXX=clang++ \ -# FUZZ_CXXFLAGS="-fsanitize-coverage=trace-pc-guard -fsanitize=address" \ +# CFLAGS="-fsanitize-coverage=trace-pc-guard -fsanitize=address" \ # LIB_FUZZING_ENGINE=/usr/lib/llvm-4.0/lib/libFuzzer.a \ # fuzz-all #