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lib/util/openat.c
58 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) 2015, 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 <fcntl.h> #include <unistd.h> #include <sudo_compat.h> #ifndef HAVE_OPENAT int sudo_openat(int dfd, const char *path, int flags, mode_t mode) { int fd, odfd; if (dfd == AT_FDCWD) return open(path, flags, mode); /* Save cwd (cannot use O_PATH on older Linux kernels). */ if ((odfd = open(".", O_RDONLY|O_DIRECTORY)) == -1) return -1; if (fchdir(dfd) == -1) { close(odfd); return -1; } fd = open(path, flags, mode); /* Restore cwd */ if (fchdir(odfd) == -1) { /* Should not happen */ if (fd != -1) { close(fd); fd = -1; } } close(odfd); return fd; } #endif /* HAVE_OPENAT */