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lib/util/fstatat.c
65 строк
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Todd C. Miller
Open directories with the O_DIRECTORY flag.
02 окт 2025, 01:10
02 окт 2025, 01:10
7c2c322
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/* * SPDX-License-Identifier: ISC * * Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <config.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <sudo_compat.h> #ifndef HAVE_FSTATAT int sudo_fstatat(int dfd, const char * restrict path, struct stat * restrict sb, int flag) { int odfd, ret = -1; if (dfd == (int)AT_FDCWD) { if (ISSET(flag, AT_SYMLINK_NOFOLLOW)) return lstat(path, sb); else return stat(path, sb); } /* Save cwd (cannot use O_PATH on older Linux kernels). */ if ((odfd = open(".", O_RDONLY|O_DIRECTORY)) == -1) goto done; if (fchdir(dfd) == -1) goto done; if (ISSET(flag, AT_SYMLINK_NOFOLLOW)) ret = lstat(path, sb); else ret = stat(path, sb); /* Restore cwd */ if (fchdir(odfd) == -1) { /* Should not happen */ ret = -1; } done: if (odfd != -1) close(odfd); return ret; } #endif /* HAVE_FSTATAT */