From patchwork Fri Nov 25 09:50:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?w4Z2YXIgQXJuZmrDtnLDsCBCamFybWFzb24=?= X-Patchwork-Id: 13055694 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 12BE9C4321E for ; Fri, 25 Nov 2022 09:55:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230209AbiKYJzE (ORCPT ); Fri, 25 Nov 2022 04:55:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229847AbiKYJye (ORCPT ); Fri, 25 Nov 2022 04:54:34 -0500 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5196C4842B for ; Fri, 25 Nov 2022 01:51:57 -0800 (PST) Received: by mail-wm1-x333.google.com with SMTP id a11-20020a05600c2d4b00b003cf6f5fd9f1so3012016wmg.2 for ; Fri, 25 Nov 2022 01:51:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=hj43VK7Jg+Uew39T4EakLpqRzJ8BYIYg6M6EY59gC2Y=; b=qL4cy4z3qog64+Iuw3jeyJXoLG9U62197Qgqn4TSmF2feFU3KkXFUIXE2Glw5r6Kmn RZiTxz5BiVbqYHCS1gqqWJYuR0MD8D7pf+7BThohc/LFUEcgMDmstpti07hVZpHScyT2 3XKFPDTVufCmKSF+1aNQzKaNNeB2GyJuzcRxjmnifXf9ozXPE+WsLxITp+6EKvWQwJZT 8pT4h7qOzGdhJUcm2gudrNe4q+X/y6azHelx5sutvPX6BOVaUsQQ6C85IjfkCxk1M+be U5r6sohHi0zPYED1vQsBKbB4ZqkRXBH7hHvZRX2ldCd1EjAYCDytLQquI8okp5+f/sTz DMcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=hj43VK7Jg+Uew39T4EakLpqRzJ8BYIYg6M6EY59gC2Y=; b=F2FcvVmjNZ1iWrJZsvjMwl1jSoYJHPvYPi/P7mUyhyUkHQMMp7078hfamcJLYYsawG 6KtcFf8Xq4Hn6SMVK32Xl/NHxafphAdffw1AIEmYzU2/GdwicsVzk8Lwq2NET7VDUr2h 7KcVV476AJjF6Ey+M85Kp5zJlCd7q6jRdW7FAMiRhmcoxjJa7C9fO2b7XQhyv6NJ2RPR 3vAZm/rCSW1GqQpDpuVL3PIngn1fYSuNki2Tm0x/JrxS+ACDz6pv+8au+aXHaZUEuhXa /NyV8zqZutNV01g7R6HPXWBT9/J/VYVKom5M+cw+p7wCreNgFlJivfJ0gcgA5D1MJvTx ZsZw== X-Gm-Message-State: ANoB5pladJ8LjjkpJ92CEB1vi1LfszTF7xl6nYtXTX3Ro7q8w31spyiK CabP6QtShLdo1dqK0qQWgjq0MFxHN+i3gMbb X-Google-Smtp-Source: AA0mqf7YDEDl5Gie51re8299h2sGbXpJBEuiFSzFeN2mtdFJvpOhYAQwGtLTXxuIuxyeTczEvzLk9g== X-Received: by 2002:a7b:c3c9:0:b0:3cf:5442:bbe with SMTP id t9-20020a7bc3c9000000b003cf54420bbemr30920835wmj.2.1669369889454; Fri, 25 Nov 2022 01:51:29 -0800 (PST) Received: from vm.nix.is (vm.nix.is. [2a01:4f8:120:2468::2]) by smtp.gmail.com with ESMTPSA id z6-20020adfe546000000b0023655e51c33sm3420975wrm.4.2022.11.25.01.51.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Nov 2022 01:51:28 -0800 (PST) From: =?utf-8?b?w4Z2YXIgQXJuZmrDtnLDsCBCamFybWFzb24=?= To: git@vger.kernel.org Cc: Junio C Hamano , Derrick Stolee , Jeff King , Taylor Blau , =?utf-8?q?SZEDER_G=C3=A1bor?= , =?utf-8?b?w4Z2YXIg?= =?utf-8?b?QXJuZmrDtnLDsCBCamFybWFzb24=?= Subject: [PATCH v3 8/9] config API: add "string" version of *_value_multi(), fix segfaults Date: Fri, 25 Nov 2022 10:50:09 +0100 Message-Id: X-Mailer: git-send-email 2.39.0.rc0.955.ge9b241be664 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Fix numerous and mostly long-standing segfaults in consumers of the *_config_*value_multi() API. As discussed in the preceding commit an empty key in the config syntax yields a "NULL" string, which these users would give to strcmp() (or similar), resulting in segfaults. As this change shows, most users users of the *_config_*value_multi() API didn't really want such an an unsafe and low-level API, let's give them something with the safety of git_config_get_string() instead. This fix is similar to what the *_string() functions and others acquired in[1] and [2]. Namely introducing and using a safer "*_get_string_multi()" variant of the low-level "_*value_multi()" function. This fixes segfaults in code introduced in: - d811c8e17c6 (versionsort: support reorder prerelease suffixes, 2015-02-26) - c026557a373 (versioncmp: generalize version sort suffix reordering, 2016-12-08) - a086f921a72 (submodule: decouple url and submodule interest, 2017-03-17) - a6be5e6764a (log: add log.excludeDecoration config option, 2020-04-16) - 92156291ca8 (log: add default decoration filter, 2022-08-05) - 50a044f1e40 (gc: replace config subprocesses with API calls, 2022-09-27) There are now three remaining files using the low-level API: - Two cases in "builtin/submodule--helper.c", where it's used safely to see if any config exists. - One in "builtin/for-each-repo.c", which we'll convert in a subsequent commit. - The "t/helper/test-config.c" code added in [3]. As seen in the preceding commit we need to give the "t/helper/test-config.c" caller these "NULL" entries. We could also alter the underlying git_configset_get_value_multi() function to be "string safe", but doing so would leave no room for other variants of "*_get_value_multi()" that coerce to other types. Such coercion can't be built on the string version, since as we've established "NULL" is a true value in the boolean context, but if we coerced it to "" for use in a list of strings it'll be subsequently coerced to "false" as a boolean. The callback pattern being used here will make it easy to introduce e.g. a "multi" variant which coerces its values to "bool", "int", "path" etc. 1. 40ea4ed9032 (Add config_error_nonbool() helper function, 2008-02-11) 2. 6c47d0e8f39 (config.c: guard config parser from value=NULL, 2008-02-11). 3. 4c715ebb96a (test-config: add tests for the config_set API, 2014-07-28) Signed-off-by: Ævar Arnfjörð Bjarmason --- builtin/gc.c | 6 +++--- builtin/log.c | 4 ++-- config.c | 32 ++++++++++++++++++++++++++++++++ config.h | 19 +++++++++++++++++++ pack-bitmap.c | 2 +- submodule.c | 2 +- t/t4202-log.sh | 8 ++++++-- t/t5310-pack-bitmaps.sh | 8 ++++++-- t/t7004-tag.sh | 9 +++++++-- t/t7413-submodule-is-active.sh | 8 ++++++-- t/t7900-maintenance.sh | 22 +++++++++++++++++----- versioncmp.c | 4 ++-- 12 files changed, 102 insertions(+), 22 deletions(-) diff --git a/builtin/gc.c b/builtin/gc.c index 69503e0a023..2d95c5b29aa 100644 --- a/builtin/gc.c +++ b/builtin/gc.c @@ -1513,7 +1513,7 @@ static int maintenance_register(int argc, const char **argv, const char *prefix) else git_config_set("maintenance.strategy", "incremental"); - if (!git_config_get_value_multi(key, &list)) { + if (!git_config_get_string_multi(key, &list)) { for_each_string_list_item(item, list) { if (!strcmp(maintpath, item->string)) { found = 1; @@ -1581,8 +1581,8 @@ static int maintenance_unregister(int argc, const char **argv, const char *prefi git_configset_add_file(&cs, config_file); } if (!(config_file - ? git_configset_get_value_multi(&cs, key, &list) - : git_config_get_value_multi(key, &list))) { + ? git_configset_get_string_multi(&cs, key, &list) + : git_config_get_string_multi(key, &list))) { for_each_string_list_item(item, list) { if (!strcmp(maintpath, item->string)) { found = 1; diff --git a/builtin/log.c b/builtin/log.c index cc9d92f95da..cd17f311712 100644 --- a/builtin/log.c +++ b/builtin/log.c @@ -184,8 +184,8 @@ static void set_default_decoration_filter(struct decoration_filter *decoration_f struct string_list *include = decoration_filter->include_ref_pattern; const struct string_list *config_exclude; - if (!git_config_get_value_multi("log.excludeDecoration", - &config_exclude)) { + if (!git_config_get_string_multi("log.excludeDecoration", + &config_exclude)) { struct string_list_item *item; for_each_string_list_item(item, config_exclude) string_list_append(decoration_filter->exclude_ref_config_pattern, diff --git a/config.c b/config.c index 0b07045ed8c..9bd43189c02 100644 --- a/config.c +++ b/config.c @@ -2437,6 +2437,25 @@ int git_configset_get_value_multi(struct config_set *cs, const char *key, return 0; } +static int check_multi_string(struct string_list_item *item, void *util) +{ + return item->string ? 0 : config_error_nonbool(util); +} + +int git_configset_get_string_multi(struct config_set *cs, const char *key, + const struct string_list **dest) +{ + int ret; + + if ((ret = git_configset_get_value_multi(cs, key, dest))) + return ret; + if ((ret = for_each_string_list((struct string_list *)*dest, + check_multi_string, (void *)key))) + return ret; + + return 0; +} + int git_configset_get_string(struct config_set *cs, const char *key, char **dest) { const char *value; @@ -2587,6 +2606,13 @@ int repo_config_get_value_multi(struct repository *repo, const char *key, return git_configset_get_value_multi(repo->config, key, dest); } +int repo_config_get_string_multi(struct repository *repo, const char *key, + const struct string_list **dest) +{ + git_config_check_init(repo); + return git_configset_get_string_multi(repo->config, key, dest); +} + int repo_config_get_string(struct repository *repo, const char *key, char **dest) { @@ -2697,6 +2723,12 @@ int git_config_get_value_multi(const char *key, const struct string_list **dest) return repo_config_get_value_multi(the_repository, key, dest); } +int git_config_get_string_multi(const char *key, + const struct string_list **dest) +{ + return repo_config_get_string_multi(the_repository, key, dest); +} + int git_config_get_string(const char *key, char **dest) { return repo_config_get_string(the_repository, key, dest); diff --git a/config.h b/config.h index 7f6ce6f2fb5..3079d60a860 100644 --- a/config.h +++ b/config.h @@ -472,6 +472,19 @@ RESULT_MUST_BE_USED int git_configset_get_value_multi(struct config_set *cs, const char *key, const struct string_list **dest); +/** + * A validation wrapper for git_configset_get_value_multi() which does + * for it what git_configset_get_string() does for + * git_configset_get_value(). + * + * The configuration syntax allows for "[section] key", which will + * give us a NULL entry in the "struct string_list", as opposed to + * "[section] key =" which is the empty string. Most users of the API + * are not prepared to handle NULL in a "struct string_list". + */ +int git_configset_get_string_multi(struct config_set *cs, const char *key, + const struct string_list **dest); + /** * Clears `config_set` structure, removes all saved variable-value pairs. */ @@ -507,6 +520,9 @@ int repo_config_get_value(struct repository *repo, RESULT_MUST_BE_USED int repo_config_get_value_multi(struct repository *repo, const char *key, const struct string_list **dest); +RESULT_MUST_BE_USED +int repo_config_get_string_multi(struct repository *repo, const char *key, + const struct string_list **dest); int repo_config_get_string(struct repository *repo, const char *key, char **dest); int repo_config_get_string_tmp(struct repository *repo, @@ -561,6 +577,9 @@ int git_config_get_value(const char *key, const char **value); RESULT_MUST_BE_USED int git_config_get_value_multi(const char *key, const struct string_list **dest); +RESULT_MUST_BE_USED +int git_config_get_string_multi(const char *key, + const struct string_list **dest); /** * Resets and invalidates the config cache. diff --git a/pack-bitmap.c b/pack-bitmap.c index 81f0c0e016b..dd05ab03ca0 100644 --- a/pack-bitmap.c +++ b/pack-bitmap.c @@ -2303,7 +2303,7 @@ const struct string_list *bitmap_preferred_tips(struct repository *r) { const struct string_list *dest; - if (!repo_config_get_value_multi(r, "pack.preferbitmaptips", &dest)) + if (!repo_config_get_string_multi(r, "pack.preferbitmaptips", &dest)) return dest; return NULL; } diff --git a/submodule.c b/submodule.c index e43c4230ba3..0f6cf864ed9 100644 --- a/submodule.c +++ b/submodule.c @@ -274,7 +274,7 @@ int is_tree_submodule_active(struct repository *repo, free(key); /* submodule.active is set */ - if (!repo_config_get_value_multi(repo, "submodule.active", &sl)) { + if (!repo_config_get_string_multi(repo, "submodule.active", &sl)) { struct pathspec ps; struct strvec args = STRVEC_INIT; const struct string_list_item *item; diff --git a/t/t4202-log.sh b/t/t4202-log.sh index e4f02d8208b..ae73aef922f 100755 --- a/t/t4202-log.sh +++ b/t/t4202-log.sh @@ -835,7 +835,7 @@ test_expect_success 'log.decorate configuration' ' ' -test_expect_failure 'parse log.excludeDecoration with no value' ' +test_expect_success 'parse log.excludeDecoration with no value' ' cp .git/config .git/config.orig && test_when_finished mv .git/config.orig .git/config && @@ -843,7 +843,11 @@ test_expect_failure 'parse log.excludeDecoration with no value' ' [log] excludeDecoration EOF - git log --decorate=short + cat >expect <<-\EOF && + error: missing value for '\''log.excludeDecoration'\'' + EOF + git log --decorate=short 2>actual && + test_cmp expect actual ' test_expect_success 'decorate-refs with glob' ' diff --git a/t/t5310-pack-bitmaps.sh b/t/t5310-pack-bitmaps.sh index 2e65c8139c4..894c750080c 100755 --- a/t/t5310-pack-bitmaps.sh +++ b/t/t5310-pack-bitmaps.sh @@ -404,7 +404,7 @@ test_bitmap_cases () { ) ' - test_expect_failure 'pack.preferBitmapTips' ' + test_expect_success 'pack.preferBitmapTips' ' git init repo && test_when_finished "rm -rf repo" && ( @@ -416,7 +416,11 @@ test_bitmap_cases () { [pack] preferBitmapTips EOF - git repack -adb + cat >expect <<-\EOF && + error: missing value for '\''pack.preferbitmaptips'\'' + EOF + git repack -adb 2>actual && + test_cmp expect actual ) ' diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh index f343551a7d4..f4a31ada79a 100755 --- a/t/t7004-tag.sh +++ b/t/t7004-tag.sh @@ -1843,7 +1843,7 @@ test_expect_success 'invalid sort parameter in configuratoin' ' test_must_fail git tag -l "foo*" ' -test_expect_failure 'version sort handles empty value for versionsort.{prereleaseSuffix,suffix}' ' +test_expect_success 'version sort handles empty value for versionsort.{prereleaseSuffix,suffix}' ' cp .git/config .git/config.orig && test_when_finished mv .git/config.orig .git/config && @@ -1852,7 +1852,12 @@ test_expect_failure 'version sort handles empty value for versionsort.{prereleas prereleaseSuffix suffix EOF - git tag -l --sort=version:refname + cat >expect <<-\EOF && + error: missing value for '\''versionsort.suffix'\'' + error: missing value for '\''versionsort.prereleasesuffix'\'' + EOF + git tag -l --sort=version:refname 2>actual && + test_cmp expect actual ' test_expect_success 'version sort with prerelease reordering' ' diff --git a/t/t7413-submodule-is-active.sh b/t/t7413-submodule-is-active.sh index bfe27e50732..887d181b72e 100755 --- a/t/t7413-submodule-is-active.sh +++ b/t/t7413-submodule-is-active.sh @@ -51,7 +51,7 @@ test_expect_success 'is-active works with submodule..active config' ' test-tool -C super submodule is-active sub1 ' -test_expect_failure 'is-active handles submodule.active config missing a value' ' +test_expect_success 'is-active handles submodule.active config missing a value' ' cp super/.git/config super/.git/config.orig && test_when_finished mv super/.git/config.orig super/.git/config && @@ -60,7 +60,11 @@ test_expect_failure 'is-active handles submodule.active config missing a value' active EOF - test-tool -C super submodule is-active sub1 + cat >expect <<-\EOF && + error: missing value for '\''submodule.active'\'' + EOF + test-tool -C super submodule is-active sub1 2>actual && + test_cmp expect actual ' test_expect_success 'is-active works with basic submodule.active config' ' diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh index 2dbac07be83..487e326b3fa 100755 --- a/t/t7900-maintenance.sh +++ b/t/t7900-maintenance.sh @@ -524,7 +524,7 @@ test_expect_success 'register and unregister' ' git maintenance unregister --config-file ./other --force ' -test_expect_failure 'register with no value for maintenance.repo' ' +test_expect_success 'register with no value for maintenance.repo' ' cp .git/config .git/config.orig && test_when_finished mv .git/config.orig .git/config && @@ -532,10 +532,15 @@ test_expect_failure 'register with no value for maintenance.repo' ' [maintenance] repo EOF - git maintenance register + cat >expect <<-\EOF && + error: missing value for '\''maintenance.repo'\'' + EOF + git maintenance register 2>actual && + test_cmp expect actual && + git config maintenance.repo ' -test_expect_failure 'unregister with no value for maintenance.repo' ' +test_expect_success 'unregister with no value for maintenance.repo' ' cp .git/config .git/config.orig && test_when_finished mv .git/config.orig .git/config && @@ -546,8 +551,15 @@ test_expect_failure 'unregister with no value for maintenance.repo' ' cat >expect <<-\EOF && error: missing value for '\''maintenance.repo'\'' EOF - git maintenance unregister && - git maintenance unregister --force + test_expect_code 128 git maintenance unregister 2>actual.raw && + grep ^error actual.raw >actual && + test_cmp expect actual && + git config maintenance.repo && + + git maintenance unregister --force 2>actual.raw && + grep ^error actual.raw >actual && + test_cmp expect actual && + git config maintenance.repo ' test_expect_success !MINGW 'register and unregister with regex metacharacters' ' diff --git a/versioncmp.c b/versioncmp.c index 60c3a517122..7498da96e0e 100644 --- a/versioncmp.c +++ b/versioncmp.c @@ -164,8 +164,8 @@ int versioncmp(const char *s1, const char *s2) const char *const oldk = "versionsort.prereleasesuffix"; const struct string_list *newl; const struct string_list *oldl; - int new = git_config_get_value_multi(newk, &newl); - int old = git_config_get_value_multi(oldk, &oldl); + int new = git_config_get_string_multi(newk, &newl); + int old = git_config_get_string_multi(oldk, &oldl); if (!new && !old) warning("ignoring %s because %s is set", oldk, newk);