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Diffstat (limited to 'posix/execvpe.c')
| -rw-r--r-- | posix/execvpe.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/posix/execvpe.c b/posix/execvpe.c deleted file mode 100644 index 4d5be86a00..0000000000 --- a/posix/execvpe.c +++ /dev/null @@ -1,187 +0,0 @@ -/* Copyright (C) 1991-2017 Free Software Foundation, Inc. - 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 - <http://www.gnu.org/licenses/>. */ - -#include <unistd.h> -#include <stdarg.h> -#include <stdbool.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> -#include <paths.h> -#include <confstr.h> -#include <sys/param.h> - -#ifndef PATH_MAX -# ifdef MAXPATHLEN -# define PATH_MAX MAXPATHLEN -# else -# define PATH_MAX 1024 -# endif -#endif - -/* The file is accessible but it is not an executable file. Invoke - the shell to interpret it as a script. */ -static void -maybe_script_execute (const char *file, char *const argv[], char *const envp[]) -{ - ptrdiff_t argc; - for (argc = 0; argv[argc] != NULL; argc++) - { - if (argc == INT_MAX - 1) - { - errno = E2BIG; - return; - } - } - - /* Construct an argument list for the shell based on original arguments: - 1. Empty list (argv = { NULL }, argc = 1 }: new argv will contain 3 - arguments - default shell, script to execute, and ending NULL. - 2. Non empty argument list (argc = { ..., NULL }, argc > 1}: new argv - will contain also the default shell and the script to execute. It - will also skip the script name in arguments and only copy script - arguments. */ - char *new_argv[argc > 1 ? 2 + argc : 3]; - new_argv[0] = (char *) _PATH_BSHELL; - new_argv[1] = (char *) file; - if (argc > 1) - memcpy (new_argv + 2, argv + 1, argc * sizeof(char *)); - else - new_argv[2] = NULL; - - /* Execute the shell. */ - __execve (new_argv[0], new_argv, envp); -} - - -/* Execute FILE, searching in the `PATH' environment variable if it contains - no slashes, with arguments ARGV and environment from ENVP. */ -int -__execvpe (const char *file, char *const argv[], char *const envp[]) -{ - /* We check the simple case first. */ - if (*file == '\0') - { - __set_errno (ENOENT); - return -1; - } - - /* Don't search when it contains a slash. */ - if (strchr (file, '/') != NULL) - { - __execve (file, argv, envp); - - if (errno == ENOEXEC) - maybe_script_execute (file, argv, envp); - - return -1; - } - - const char *path = getenv ("PATH"); - if (!path) - path = CS_PATH; - /* Although GLIBC does not enforce NAME_MAX, we set it as the maximum - size to avoid unbounded stack allocation. Same applies for - PATH_MAX. */ - size_t file_len = __strnlen (file, NAME_MAX) + 1; - size_t path_len = __strnlen (path, PATH_MAX - 1) + 1; - - /* NAME_MAX does not include the terminating null character. */ - if ((file_len - 1 > NAME_MAX) - || !__libc_alloca_cutoff (path_len + file_len + 1)) - { - errno = ENAMETOOLONG; - return -1; - } - - const char *subp; - bool got_eacces = false; - /* The resulting string maximum size would be potentially a entry - in PATH plus '/' (path_len + 1) and then the the resulting file name - plus '\0' (file_len since it already accounts for the '\0'). */ - char buffer[path_len + file_len + 1]; - for (const char *p = path; ; p = subp) - { - subp = __strchrnul (p, ':'); - - /* PATH is larger than PATH_MAX and thus potentially larger than - the stack allocation. */ - if (subp - p >= path_len) - { - /* If there is only one path, bail out. */ - if (*subp == '\0') - break; - /* Otherwise skip to next one. */ - continue; - } - - /* Use the current path entry, plus a '/' if nonempty, plus the file to - execute. */ - char *pend = mempcpy (buffer, p, subp - p); - *pend = '/'; - memcpy (pend + (p < subp), file, file_len); - - __execve (buffer, argv, envp); - - if (errno == ENOEXEC) - /* This has O(P*C) behavior, where P is the length of the path and C - is the argument count. A better strategy would be allocate the - substitute argv and reuse it each time through the loop (so it - behaves as O(P+C) instead. */ - maybe_script_execute (buffer, argv, envp); - - switch (errno) - { - case EACCES: - /* Record that we got a 'Permission denied' error. If we end - up finding no executable we can use, we want to diagnose - that we did find one but were denied access. */ - got_eacces = true; - case ENOENT: - case ESTALE: - case ENOTDIR: - /* Those errors indicate the file is missing or not executable - by us, in which case we want to just try the next path - directory. */ - case ENODEV: - case ETIMEDOUT: - /* Some strange filesystems like AFS return even - stranger error numbers. They cannot reasonably mean - anything else so ignore those, too. */ - break; - - default: - /* Some other error means we found an executable file, but - something went wrong executing it; return the error to our - caller. */ - return -1; - } - - if (*subp++ == '\0') - break; - } - - /* We tried every element and none of them worked. */ - if (got_eacces) - /* At least one failure was due to permissions, so report that - error. */ - __set_errno (EACCES); - - return -1; -} - -weak_alias (__execvpe, execvpe) |