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Wed, 16 Oct 2024 19:21:15 +0000 Received: from fedora.redhat.com (bras-base-toroon4859w-grc-89-184-146-156-41.dsl.bell.ca [184.146.156.41]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a245.dreamhost.com (Postfix) with ESMTPSA id 4XTLRZ6dH3z93; Wed, 16 Oct 2024 12:21:14 -0700 (PDT) From: Siddhesh Poyarekar To: libc-alpha@sourceware.org Cc: carlos@redhat.com Subject: [PATCH 1/2] tst-faccessat.c: Port to libsupport Date: Wed, 16 Oct 2024 15:21:07 -0400 Message-ID: <20241016192108.811046-2-siddhesh@sourceware.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241016192108.811046-1-siddhesh@sourceware.org> References: <20241016192108.811046-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-1171.2 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_SOFTFAIL, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org Use libsupport convenience functions and macros instead of the old test-skeleton. Also add a new xdup() convenience wrapper function. Signed-off-by: Siddhesh Poyarekar --- io/tst-faccessat.c | 219 +++++++++++++-------------------------------- support/Makefile | 1 + support/xdup.c | 30 +++++++ support/xunistd.h | 1 + 4 files changed, 95 insertions(+), 156 deletions(-) create mode 100644 support/xdup.c diff --git a/io/tst-faccessat.c b/io/tst-faccessat.c index b90954e318..609cdddaf7 100644 --- a/io/tst-faccessat.c +++ b/io/tst-faccessat.c @@ -1,6 +1,23 @@ -/* Test for faccessat function. */ - -#include +/* Test for faccessat function. + Copyright (C) 2006-2024 Free Software Foundation, Inc. + Copyright The GNU Toolchain Authors. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include #include #include #include @@ -8,47 +25,19 @@ #include #include +#include +#include +#include +#include #include -static void prepare (void); -#define PREPARE(argc, argv) prepare () - -static int do_test (void); -#define TEST_FUNCTION do_test () - -#include "../test-skeleton.c" - static int dir_fd; static void -prepare (void) +prepare (int argc, char **argv) { - size_t test_dir_len = strlen (test_dir); - static const char dir_name[] = "/tst-faccessat.XXXXXX"; - - size_t dirbuflen = test_dir_len + sizeof (dir_name); - char *dirbuf = malloc (dirbuflen); - if (dirbuf == NULL) - { - puts ("out of memory"); - exit (1); - } - - snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name); - if (mkdtemp (dirbuf) == NULL) - { - puts ("cannot create temporary directory"); - exit (1); - } - - add_temp_file (dirbuf); - - dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY); - if (dir_fd == -1) - { - puts ("cannot open directory"); - exit (1); - } + dir_fd = xopen (support_create_temp_directory ("tst-faccessat."), + O_RDONLY | O_DIRECTORY, 0); } @@ -56,159 +45,77 @@ static int do_test (void) { /* fdopendir takes over the descriptor, make a copy. */ - int dupfd = dup (dir_fd); - if (dupfd == -1) - { - puts ("dup failed"); - return 1; - } - if (lseek (dupfd, 0, SEEK_SET) != 0) - { - puts ("1st lseek failed"); - return 1; - } + int dupfd = xdup (dir_fd); + xlseek (dupfd, 0, SEEK_SET); /* The directory should be empty save the . and .. files. */ - DIR *dir = fdopendir (dupfd); - if (dir == NULL) - { - puts ("fdopendir failed"); - return 1; - } + DIR *dir = xfdopendir (dupfd); + struct dirent64 *d; - while ((d = readdir64 (dir)) != NULL) + while ((d = xreaddir64 (dir)) != NULL) if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0) - { - printf ("temp directory contains file \"%s\"\n", d->d_name); - return 1; - } - closedir (dir); + FAIL_EXIT1 ("temp directory contains file \"%s\"\n", d->d_name); + xclosedir (dir); /* Try to create a file. */ int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666); if (fd == -1) { if (errno == ENOSYS) - { - puts ("*at functions not supported"); - return 0; - } + FAIL_UNSUPPORTED ("*at functions not supported"); - puts ("file creation failed"); - return 1; + FAIL_EXIT1 ("file creation failed"); } xwrite (fd, "hello", 5); puts ("file created"); /* Before closing the file, try using this file descriptor to open another file. This must fail. */ - if (faccessat (fd, "should-not-work", F_OK, AT_EACCESS) != -1) - { - puts ("faccessat using descriptor for normal file worked"); - return 1; - } - if (errno != ENOTDIR) - { - puts ("\ -error for faccessat using descriptor for normal file not ENOTDIR "); - return 1; - } - - close (fd); + TEST_VERIFY_EXIT (faccessat (fd, "should-not-work", F_OK, AT_EACCESS) == -1); + TEST_VERIFY_EXIT (errno == ENOTDIR); - int result = 0; + xclose (fd); - if (faccessat (dir_fd, "some-file", F_OK, AT_EACCESS)) - { - printf ("faccessat F_OK: %m\n"); - result = 1; - } - if (faccessat (dir_fd, "some-file", W_OK, AT_EACCESS)) - { - printf ("faccessat W_OK: %m\n"); - result = 1; - } + TEST_VERIFY (faccessat (dir_fd, "some-file", F_OK, AT_EACCESS) == 0); + TEST_VERIFY (faccessat (dir_fd, "some-file", W_OK, AT_EACCESS) == 0); errno = 0; - if (faccessat (dir_fd, "some-file", X_OK, AT_EACCESS) == 0 - || errno != EACCES) - { - printf ("faccessat X_OK on nonexecutable: %m\n"); - result = 1; - } + TEST_VERIFY (faccessat (dir_fd, "some-file", X_OK, AT_EACCESS) != 0 + && errno == EACCES); if (fchmodat (dir_fd, "some-file", 0400, 0) != 0) - { - printf ("fchownat failed: %m\n"); - return 1; - } + FAIL_EXIT1 ("fchownat failed: %m\n"); - if (faccessat (dir_fd, "some-file", R_OK, AT_EACCESS)) - { - printf ("faccessat R_OK: %m\n"); - result = 1; - } + TEST_VERIFY (faccessat (dir_fd, "some-file", R_OK, AT_EACCESS) == 0); + /* Write would succeed only for EUID root, otherwise this test should + fail. */ errno = 0; - if (faccessat (dir_fd, "some-file", W_OK, AT_EACCESS) == 0 - ? (geteuid () != 0) : (errno != EACCES)) - { - printf ("faccessat W_OK on unwritable file: %m\n"); - result = 1; - } + TEST_VERIFY (faccessat (dir_fd, "some-file", W_OK, AT_EACCESS) == 0 + ? (geteuid () == 0) : (errno == EACCES)); /* Create a file descriptor which is closed again right away. */ - int dir_fd2 = dup (dir_fd); - if (dir_fd2 == -1) - { - puts ("dup failed"); - return 1; - } + int dir_fd2 = xdup (dir_fd); close (dir_fd2); /* With the file descriptor closed the next call must fail. */ - if (faccessat (dir_fd2, "some-file", F_OK, AT_EACCESS) != -1) - { - puts ("faccessat using closed descriptor succeeded"); - return 1; - } - if (errno != EBADF) - { - puts ("faccessat using closed descriptor did not set EBADF"); - return 1; - } + TEST_VERIFY_EXIT (faccessat (dir_fd2, "some-file", F_OK, AT_EACCESS) + == -1); + TEST_VERIFY_EXIT (errno == EBADF); /* Same with a non-existing file. */ - if (faccessat (dir_fd2, "non-existing-file", F_OK, AT_EACCESS) != -1) - { - puts ("2nd faccessat using closed descriptor succeeded"); - return 1; - } - if (errno != EBADF) - { - puts ("2nd faccessat using closed descriptor did not set EBADF"); - return 1; - } + TEST_VERIFY_EXIT (faccessat (dir_fd2, "non-existing-file", F_OK, AT_EACCESS) + == -1); + TEST_VERIFY_EXIT (errno == EBADF); - if (unlinkat (dir_fd, "some-file", 0) != 0) - { - puts ("unlinkat failed"); - result = 1; - } + TEST_VERIFY (unlinkat (dir_fd, "some-file", 0) == 0); - close (dir_fd); + xclose (dir_fd); - fd = faccessat (-1, "some-file", F_OK, AT_EACCESS); - if (fd != -1) - { - puts ("faccessat using -1 descriptor succeeded"); - return 1; - } - if (errno != EBADF) - { - puts ("faccessat using -1 descriptor did not set EBADF"); - return 1; - } + TEST_VERIFY_EXIT (faccessat (-1, "some-file", F_OK, AT_EACCESS) == -1); + TEST_VERIFY_EXIT (errno == EBADF); - return result; + return 0; } +#define PREPARE prepare +#include diff --git a/support/Makefile b/support/Makefile index 84e2419775..099f5ebb9c 100644 --- a/support/Makefile +++ b/support/Makefile @@ -128,6 +128,7 @@ libsupport-routines = \ xcopy_file_range \ xdlfcn \ xdlmopen \ + xdup \ xdup2 \ xfchmod \ xfclose \ diff --git a/support/xdup.c b/support/xdup.c new file mode 100644 index 0000000000..1eab317354 --- /dev/null +++ b/support/xdup.c @@ -0,0 +1,30 @@ +/* dup with error checking. + Copyright The GNU Toolchain Authors. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +int +xdup (int from) +{ + int ret = dup (from); + if (ret < 0) + FAIL_EXIT1 ("dup (%d): %m", from); + + return ret; +} diff --git a/support/xunistd.h b/support/xunistd.h index 204951bce7..0c6d837ac0 100644 --- a/support/xunistd.h +++ b/support/xunistd.h @@ -35,6 +35,7 @@ pid_t xfork (void); pid_t xwaitpid (pid_t, int *status, int flags); void xpipe (int[2]); void xdup2 (int, int); +int xdup (int); int xopen (const char *path, int flags, mode_t); void support_check_stat_fd (const char *name, int fd, int result); void support_check_stat_path (const char *name, const char *path, int result); From patchwork Wed Oct 16 19:21:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 1998189 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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Wed, 16 Oct 2024 12:21:15 -0700 (PDT) From: Siddhesh Poyarekar To: libc-alpha@sourceware.org Cc: carlos@redhat.com Subject: [PATCH 2/2] io: Add setuid tests for faccessat Date: Wed, 16 Oct 2024 15:21:08 -0400 Message-ID: <20241016192108.811046-3-siddhesh@sourceware.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241016192108.811046-1-siddhesh@sourceware.org> References: <20241016192108.811046-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-1171.4 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_SOFTFAIL, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org Add a new test tst-faccessat-setuid that iterates through real and effective UID/GID combination and tests the faccessat() interface for default and AT_EACCESS flags. Signed-off-by: Siddhesh Poyarekar --- io/Makefile | 4 + io/tst-faccessat-setuid.c | 163 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 167 insertions(+) create mode 100644 io/tst-faccessat-setuid.c diff --git a/io/Makefile b/io/Makefile index a8d575e9ce..3ae26a5aa3 100644 --- a/io/Makefile +++ b/io/Makefile @@ -232,6 +232,10 @@ tests := \ tst-utimes \ # tests +xtests := \ + tst-faccessat-setuid \ + #xtests + tests-time64 := \ tst-fcntl-time64 \ tst-fts-time64 \ diff --git a/io/tst-faccessat-setuid.c b/io/tst-faccessat-setuid.c new file mode 100644 index 0000000000..aab0261914 --- /dev/null +++ b/io/tst-faccessat-setuid.c @@ -0,0 +1,163 @@ +/* Smoke test for faccessat with different UID/GID combinations. Needs root + access. + Copyright The GNU Toolchain Authors. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#define SOMEFILE "some-file" + +static int dir_fd; +uid_t users[3]; +gid_t groups[3]; + +struct test_case +{ + int mode; + uid_t uid; + uid_t euid; + gid_t gid; + gid_t egid; + int flags; + bool succeeds; +}; + +static void +run_one_test_child (void *in) +{ + struct test_case *t = (struct test_case *) in; + + printf ("TEST: MODE=%s, UID=%d, EUID=%d, GID=%d, EGID=%d, FLAGS=%s: ", + t->mode == R_OK ? "R_OK" : "W_OK", t->uid, t->euid, t->gid, t->egid, + t->flags ? "AT_EACCESS" : "0"); + + if (setregid (t->gid, t->egid) != 0) + FAIL_EXIT1 ("Could not change group: %m\n"); + if (setreuid (t->uid, t->euid) != 0) + FAIL_EXIT1 ("Could not change user: %m\n"); + + if (faccessat (dir_fd, SOMEFILE, t->mode, t->flags) != 0 && t->succeeds) + FAIL_EXIT1 ("faccessat failed: %m\n"); + + if (!t->succeeds && errno != EACCES) + FAIL_EXIT1 ("Unexpected faccessat failure: %m\n"); + + printf ("OK%s\n", !t->succeeds ? " (FAILED with EACCES)" : ""); +} + +static void +run_one_test (int mode, int u, int eu, int g, int eg, int flags, bool succeeds) +{ + struct test_case t = + {mode, users[u], users[eu], groups[g], groups[eg], flags, succeeds}; + support_isolate_in_subprocess (run_one_test_child, &t); +} + +static int +do_test (void) +{ + + /* We need to start as root. */ + if (getuid () != 0) + FAIL_UNSUPPORTED ("Test needs to be run as root (UID 0)\n"); + + /* Collect 3 distinct users and groups to test with. */ + struct passwd *ent = NULL; + int count = 0; + while ((ent = getpwent ()) != NULL && count < 3) + { + if (ent->pw_uid == 0 || ent->pw_gid == 0) + continue; + + int i = count; + bool skip = false; + while (i > 0) + if (groups[--i] == ent->pw_gid) + skip = true; + + if (skip) + continue; + + users[count] = ent->pw_uid; + groups[count++] = ent->pw_gid; + } + + if (count < 3) + FAIL_UNSUPPORTED ("Not enough users in the system to do this test\n"); + + printf ("Testing with UID/GID:\n"); + while (--count >= 0) + printf (" UID: %d, GID: %d\n", users[count], groups[count]); + printf ("\n"); + + char *tempdir = support_create_temp_directory ("tst-faccessat-setuid."); + dir_fd = xopen (tempdir, O_RDONLY | O_DIRECTORY, 0); + + xfchmod (dir_fd, 0777); + + /* Now, create a file in it, which will be our test case. */ + + int fd = openat (dir_fd, SOMEFILE, O_CREAT|O_RDWR|O_EXCL, 0640); + if (fd == -1) + { + if (errno == ENOSYS) + FAIL_UNSUPPORTED ("*at functions not supported"); + + FAIL_EXIT1 ("file creation failed"); + } + xwrite (fd, "hello", 5); + + if (fchown (fd, users[0], groups[1]) == -1) + FAIL_EXIT1 ("fchown failed: %m\n"); + xclose (fd); + + char *somefile = xasprintf ("%s/" SOMEFILE, tempdir); + add_temp_file (somefile); + + /* Finally, run through the combinations. */ + for (int u = 0; u < 3; u++) + for (int eu = 0; eu < 3; eu++) + for (int g = 0; g < 3; g++) + for (int eg = 0; eg < 3; eg++) + { + run_one_test (R_OK, u, eu, g, eg, 0, u == 0 || g == 1); + run_one_test (W_OK, u, eu, g, eg, 0, u == 0); + run_one_test (R_OK, u, eu, g, eg, AT_EACCESS, eu == 0 || eg == 1); + run_one_test (W_OK, u, eu, g, eg, AT_EACCESS, eu == 0); + } + + xclose (dir_fd); + free (tempdir); + free (somefile); + + return 0; +} +#include