/* * Copyright (c) 2014 Google, Inc. * * Licensed under the terms of the GNU GPL License version 2 * * Selftests for execveat(2). */ #define _GNU_SOURCE /* to get O_PATH, AT_EMPTY_PATH */#include <sys/sendfile.h>#include <sys/stat.h>#include <sys/syscall.h>#include <sys/types.h>#include <sys/wait.h>#include <errno.h>#include <fcntl.h>#include <limits.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h> static char longpath[2 * PATH_MAX] = "";static char *envp[] = { "IN_TEST=yes", NULL, NULL };static char *argv[] = { "execveat", "99", NULL }; static int execveat_(int fd, const char *path, char **argv, char **envp, int flags){#ifdef __NR_execveat return syscall(__NR_execveat, fd, path, argv, envp, flags);#else errno = ENOSYS; return -1;#endif} #define check_execveat_fail(fd, path, flags, errno) \ _check_execveat_fail(fd, path, flags, errno, #errno)static int _check_execveat_fail(int fd, const char *path, int flags, int expected_errno, const char *errno_str){ int rc; errno = 0; printf("Check failure of execveat(%d, '%s', %d) with %s... ", fd, path?:"(null)", flags, errno_str); rc = execveat_(fd, path, argv, envp, flags); if (rc > 0) { printf("[FAIL] (unexpected success from execveat(2))\n"); return 1; } if (errno != expected_errno) { printf("[FAIL] (expected errno %d (%s) not %d (%s)\n", expected_errno, strerror(expected_errno), errno, strerror(errno)); return 1; } printf("[OK]\n"); return 0;} static int check_execveat_invoked_rc(int fd, const char *path, int flags, int expected_rc, int expected_rc2){ int status; int rc; pid_t child; int pathlen = path ? strlen(path) : 0; if (pathlen > 40) printf("Check success of execveat(%d, '%.20s...%s', %d)... ", fd, path, (path + pathlen - 20), flags); else printf("Check success of execveat(%d, '%s', %d)... ", fd, path?:"(null)", flags); child = fork(); if (child < 0) { printf("[FAIL] (fork() failed)\n"); return 1; } if (child == 0) { /* Child: do execveat(). */ rc = execveat_(fd, path, argv, envp, flags); printf("[FAIL]: execveat() failed, rc=%d errno=%d (%s)\n", rc, errno, strerror(errno)); exit(1); /* should not reach here */ } /* Parent: wait for & check child's exit status. */ rc = waitpid(child, &status, 0); if (rc != child) { printf("[FAIL] (waitpid(%d,...) returned %d)\n", child, rc); return 1; } if (!WIFEXITED(status)) { printf("[FAIL] (child %d did not exit cleanly, status=%08x)\n", child, status); return 1; } if ((WEXITSTATUS(status) != expected_rc) && (WEXITSTATUS(status) != expected_rc2)) { printf("[FAIL] (child %d exited with %d not %d nor %d)\n", child, WEXITSTATUS(status), expected_rc, expected_rc2); return 1; } printf("[OK]\n"); return 0;} static int check_execveat(int fd, const char *path, int flags){ return check_execveat_invoked_rc(fd, path, flags, 99, 99);} static char *concat(const char *left, const char *right){ char *result = malloc(strlen(left) + strlen(right) + 1); strcpy(result, left); strcat(result, right); return result;} static int open_or_die(const char *filename, int flags){ int fd = open(filename, flags); if (fd < 0) { printf("Failed to open '%s'; " "check prerequisites are available\n", filename); exit(1); } return fd;} static void exe_cp(const char *src, const char *dest){ int in_fd = open_or_die(src, O_RDONLY); int out_fd = open(dest, O_RDWR|O_CREAT|O_TRUNC, 0755); struct stat info; fstat(in_fd, &info); sendfile(out_fd, in_fd, NULL, info.st_size); close(in_fd); close(out_fd);} #define XX_DIR_LEN 200static int check_execveat_pathmax(int dot_dfd, const char *src, int is_script){ int fail = 0; int ii, count, len; char longname[XX_DIR_LEN + 1]; int fd; if (*longpath == '\0') { /* Create a filename close to PATH_MAX in length */ memset(longname, 'x', XX_DIR_LEN - 1); longname[XX_DIR_LEN - 1] = '/'; longname[XX_DIR_LEN] = '\0'; count = (PATH_MAX - 3) / XX_DIR_LEN; for (ii = 0; ii < count; ii++) { strcat(longpath, longname); mkdir(longpath, 0755); } len = (PATH_MAX - 3) - (count * XX_DIR_LEN); if (len <= 0) len = 1; memset(longname, 'y', len); longname[len] = '\0'; strcat(longpath, longname); } exe_cp(src, longpath); /* * Execute as a pre-opened file descriptor, which works whether this is * a script or not (because the interpreter sees a filename like * "/dev/fd/20"). */ fd = open(longpath, O_RDONLY); if (fd > 0) { printf("Invoke copy of '%s' via filename of length %zu:\n", src, strlen(longpath)); fail += check_execveat(fd, "", AT_EMPTY_PATH); } else { printf("Failed to open length %zu filename, errno=%d (%s)\n", strlen(longpath), errno, strerror(errno)); fail++; } /* * Execute as a long pathname relative to ".". If this is a script, * the interpreter will launch but fail to open the script because its * name ("/dev/fd/5/xxx....") is bigger than PATH_MAX. * * The failure code is usually 127 (POSIX: "If a command is not found, * the exit status shall be 127."), but some systems give 126 (POSIX: * "If the command name is found, but it is not an executable utility, * the exit status shall be 126."), so allow either. */ if (is_script) fail += check_execveat_invoked_rc(dot_dfd, longpath, 0, 127, 126); else fail += check_execveat(dot_dfd, longpath, 0); return fail;} static int run_tests(void){ int fail = 0; char *fullname = realpath("execveat", NULL); char *fullname_script = realpath("script", NULL); char *fullname_symlink = concat(fullname, ".symlink"); int subdir_dfd = open_or_die("subdir", O_DIRECTORY|O_RDONLY); int subdir_dfd_ephemeral = open_or_die("subdir.ephemeral", O_DIRECTORY|O_RDONLY); int dot_dfd = open_or_die(".", O_DIRECTORY|O_RDONLY); int dot_dfd_path = open_or_die(".", O_DIRECTORY|O_RDONLY|O_PATH); int dot_dfd_cloexec = open_or_die(".", O_DIRECTORY|O_RDONLY|O_CLOEXEC); int fd = open_or_die("execveat", O_RDONLY); int fd_path = open_or_die("execveat", O_RDONLY|O_PATH); int fd_symlink = open_or_die("execveat.symlink", O_RDONLY); int fd_denatured = open_or_die("execveat.denatured", O_RDONLY); int fd_denatured_path = open_or_die("execveat.denatured", O_RDONLY|O_PATH); int fd_script = open_or_die("script", O_RDONLY); int fd_ephemeral = open_or_die("execveat.ephemeral", O_RDONLY); int fd_ephemeral_path = open_or_die("execveat.path.ephemeral", O_RDONLY|O_PATH); int fd_script_ephemeral = open_or_die("script.ephemeral", O_RDONLY); int fd_cloexec = open_or_die("execveat", O_RDONLY|O_CLOEXEC); int fd_script_cloexec = open_or_die("script", O_RDONLY|O_CLOEXEC); /* Check if we have execveat at all, and bail early if not */ errno = 0; execveat_(-1, NULL, NULL, NULL, 0); if (errno == ENOSYS) { printf("[FAIL] ENOSYS calling execveat - no kernel support?\n"); return 1; } /* Change file position to confirm it doesn't affect anything */ lseek(fd, 10, SEEK_SET); /* Normal executable file: */ /* dfd + path */ fail += check_execveat(subdir_dfd, "../execveat", 0); fail += check_execveat(dot_dfd, "execveat", 0); fail += check_execveat(dot_dfd_path, "execveat", 0); /* absolute path */ fail += check_execveat(AT_FDCWD, fullname, 0); /* absolute path with nonsense dfd */ fail += check_execveat(99, fullname, 0); /* fd + no path */ fail += check_execveat(fd, "", AT_EMPTY_PATH); /* O_CLOEXEC fd + no path */ fail += check_execveat(fd_cloexec, "", AT_EMPTY_PATH); /* O_PATH fd */ fail += check_execveat(fd_path, "", AT_EMPTY_PATH); /* Mess with executable file that's already open: */ /* fd + no path to a file that's been renamed */ rename("execveat.ephemeral", "execveat.moved"); fail += check_execveat(fd_ephemeral, "", AT_EMPTY_PATH); /* fd + no path to a file that's been deleted */ unlink("execveat.moved"); /* remove the file now fd open */ fail += check_execveat(fd_ephemeral, "", AT_EMPTY_PATH); /* Mess with executable file that's already open with O_PATH */ /* fd + no path to a file that's been deleted */ unlink("execveat.path.ephemeral"); fail += check_execveat(fd_ephemeral_path, "", AT_EMPTY_PATH); /* Invalid argument failures */ fail += check_execveat_fail(fd, "", 0, ENOENT); fail += check_execveat_fail(fd, NULL, AT_EMPTY_PATH, EFAULT); /* Symlink to executable file: */ /* dfd + path */ fail += check_execveat(dot_dfd, "execveat.symlink", 0); fail += check_execveat(dot_dfd_path, "execveat.symlink", 0); /* absolute path */ fail += check_execveat(AT_FDCWD, fullname_symlink, 0); /* fd + no path, even with AT_SYMLINK_NOFOLLOW (already followed) */ fail += check_execveat(fd_symlink, "", AT_EMPTY_PATH); fail += check_execveat(fd_symlink, "", AT_EMPTY_PATH|AT_SYMLINK_NOFOLLOW); /* Symlink fails when AT_SYMLINK_NOFOLLOW set: */ /* dfd + path */ fail += check_execveat_fail(dot_dfd, "execveat.symlink", AT_SYMLINK_NOFOLLOW, ELOOP); fail += check_execveat_fail(dot_dfd_path, "execveat.symlink", AT_SYMLINK_NOFOLLOW, ELOOP); /* absolute path */ fail += check_execveat_fail(AT_FDCWD, fullname_symlink, AT_SYMLINK_NOFOLLOW, ELOOP); /* Shell script wrapping executable file: */ /* dfd + path */ fail += check_execveat(subdir_dfd, "../script", 0); fail += check_execveat(dot_dfd, "script", 0); fail += check_execveat(dot_dfd_path, "script", 0); /* absolute path */ fail += check_execveat(AT_FDCWD, fullname_script, 0); /* fd + no path */ fail += check_execveat(fd_script, "", AT_EMPTY_PATH); fail += check_execveat(fd_script, "", AT_EMPTY_PATH|AT_SYMLINK_NOFOLLOW); /* O_CLOEXEC fd fails for a script (as script file inaccessible) */ fail += check_execveat_fail(fd_script_cloexec, "", AT_EMPTY_PATH, ENOENT); fail += check_execveat_fail(dot_dfd_cloexec, "script", 0, ENOENT); /* Mess with script file that's already open: */ /* fd + no path to a file that's been renamed */ rename("script.ephemeral", "script.moved"); fail += check_execveat(fd_script_ephemeral, "", AT_EMPTY_PATH); /* fd + no path to a file that's been deleted */ unlink("script.moved"); /* remove the file while fd open */ fail += check_execveat(fd_script_ephemeral, "", AT_EMPTY_PATH); /* Rename a subdirectory in the path: */ rename("subdir.ephemeral", "subdir.moved"); fail += check_execveat(subdir_dfd_ephemeral, "../script", 0); fail += check_execveat(subdir_dfd_ephemeral, "script", 0); /* Remove the subdir and its contents */ unlink("subdir.moved/script"); unlink("subdir.moved"); /* Shell loads via deleted subdir OK because name starts with .. */ fail += check_execveat(subdir_dfd_ephemeral, "../script", 0); fail += check_execveat_fail(subdir_dfd_ephemeral, "script", 0, ENOENT); /* Flag values other than AT_SYMLINK_NOFOLLOW => EINVAL */ fail += check_execveat_fail(dot_dfd, "execveat", 0xFFFF, EINVAL); /* Invalid path => ENOENT */ fail += check_execveat_fail(dot_dfd, "no-such-file", 0, ENOENT); fail += check_execveat_fail(dot_dfd_path, "no-such-file", 0, ENOENT); fail += check_execveat_fail(AT_FDCWD, "no-such-file", 0, ENOENT); /* Attempt to execute directory => EACCES */ fail += check_execveat_fail(dot_dfd, "", AT_EMPTY_PATH, EACCES); /* Attempt to execute non-executable => EACCES */ fail += check_execveat_fail(dot_dfd, "Makefile", 0, EACCES); fail += check_execveat_fail(fd_denatured, "", AT_EMPTY_PATH, EACCES); fail += check_execveat_fail(fd_denatured_path, "", AT_EMPTY_PATH, EACCES); /* Attempt to execute nonsense FD => EBADF */ fail += check_execveat_fail(99, "", AT_EMPTY_PATH, EBADF); fail += check_execveat_fail(99, "execveat", 0, EBADF); /* Attempt to execute relative to non-directory => ENOTDIR */ fail += check_execveat_fail(fd, "execveat", 0, ENOTDIR); fail += check_execveat_pathmax(dot_dfd, "execveat", 0); fail += check_execveat_pathmax(dot_dfd, "script", 1); return fail;} static void prerequisites(void){ int fd; const char *script = "#!/bin/sh\nexit $*\n"; /* Create ephemeral copies of files */ exe_cp("execveat", "execveat.ephemeral"); exe_cp("execveat", "execveat.path.ephemeral"); exe_cp("script", "script.ephemeral"); mkdir("subdir.ephemeral", 0755); fd = open("subdir.ephemeral/script", O_RDWR|O_CREAT|O_TRUNC, 0755); write(fd, script, strlen(script)); close(fd);} int main(int argc, char **argv){ int ii; int rc; const char *verbose = getenv("VERBOSE"); if (argc >= 2) { /* If we are invoked with an argument, don't run tests. */ const char *in_test = getenv("IN_TEST"); if (verbose) { printf(" invoked with:"); for (ii = 0; ii < argc; ii++) printf(" [%d]='%s'", ii, argv[ii]); printf("\n"); } /* Check expected environment transferred. */ if (!in_test || strcmp(in_test, "yes") != 0) { printf("[FAIL] (no IN_TEST=yes in env)\n"); return 1; } /* Use the final argument as an exit code. */ rc = atoi(argv[argc - 1]); fflush(stdout); } else { prerequisites(); if (verbose) envp[1] = "VERBOSE=1"; rc = run_tests(); if (rc > 0) printf("%d tests failed\n", rc); } return rc;}
/*
* Copyright (c) 2014 Google, Inc.
*
* Licensed under the terms of the GNU GPL License version 2
*
* Selftests for execveat(2).
*/
#define _GNU_SOURCE /* to get O_PATH, AT_EMPTY_PATH */
#include <sys/sendfile.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static char longpath[2 * PATH_MAX] = "";
static char *envp[] = { "IN_TEST=yes", NULL, NULL };
static char *argv[] = { "execveat", "99", NULL };
static int execveat_(int fd, const char *path, char **argv, char **envp,
int flags)
{
#ifdef __NR_execveat
return syscall(__NR_execveat, fd, path, argv, envp, flags);
#else
errno = ENOSYS;
return -1;
#endif
}
#define check_execveat_fail(fd, path, flags, errno) \
_check_execveat_fail(fd, path, flags, errno, #errno)
static int _check_execveat_fail(int fd, const char *path, int flags,
int expected_errno, const char *errno_str)
{
int rc;
errno = 0;
printf("Check failure of execveat(%d, '%s', %d) with %s... ",
fd, path?:"(null)", flags, errno_str);
rc = execveat_(fd, path, argv, envp, flags);
if (rc > 0) {
printf("[FAIL] (unexpected success from execveat(2))\n");
return 1;
}
if (errno != expected_errno) {
printf("[FAIL] (expected errno %d (%s) not %d (%s)\n",
expected_errno, strerror(expected_errno),
errno, strerror(errno));
return 1;
}
printf("[OK]\n");
return 0;
}
static int check_execveat_invoked_rc(int fd, const char *path, int flags,
int expected_rc, int expected_rc2)
{
int status;
int rc;
pid_t child;
int pathlen = path ? strlen(path) : 0;
if (pathlen > 40)
printf("Check success of execveat(%d, '%.20s...%s', %d)... ",
fd, path, (path + pathlen - 20), flags);
else
printf("Check success of execveat(%d, '%s', %d)... ",
fd, path?:"(null)", flags);
child = fork();
if (child < 0) {
printf("[FAIL] (fork() failed)\n");
return 1;
}
if (child == 0) {
/* Child: do execveat(). */
rc = execveat_(fd, path, argv, envp, flags);
printf("[FAIL]: execveat() failed, rc=%d errno=%d (%s)\n",
rc, errno, strerror(errno));
exit(1); /* should not reach here */
}
/* Parent: wait for & check child's exit status. */
rc = waitpid(child, &status, 0);
if (rc != child) {
printf("[FAIL] (waitpid(%d,...) returned %d)\n", child, rc);
return 1;
}
if (!WIFEXITED(status)) {
printf("[FAIL] (child %d did not exit cleanly, status=%08x)\n",
child, status);
return 1;
}
if ((WEXITSTATUS(status) != expected_rc) &&
(WEXITSTATUS(status) != expected_rc2)) {
printf("[FAIL] (child %d exited with %d not %d nor %d)\n",
child, WEXITSTATUS(status), expected_rc, expected_rc2);
return 1;
}
printf("[OK]\n");
return 0;
}
static int check_execveat(int fd, const char *path, int flags)
{
return check_execveat_invoked_rc(fd, path, flags, 99, 99);
}
static char *concat(const char *left, const char *right)
{
char *result = malloc(strlen(left) + strlen(right) + 1);
strcpy(result, left);
strcat(result, right);
return result;
}
static int open_or_die(const char *filename, int flags)
{
int fd = open(filename, flags);
if (fd < 0) {
printf("Failed to open '%s'; "
"check prerequisites are available\n", filename);
exit(1);
}
return fd;
}
static void exe_cp(const char *src, const char *dest)
{
int in_fd = open_or_die(src, O_RDONLY);
int out_fd = open(dest, O_RDWR|O_CREAT|O_TRUNC, 0755);
struct stat info;
fstat(in_fd, &info);
sendfile(out_fd, in_fd, NULL, info.st_size);
close(in_fd);
close(out_fd);
}
#define XX_DIR_LEN 200
static int check_execveat_pathmax(int dot_dfd, const char *src, int is_script)
{
int fail = 0;
int ii, count, len;
char longname[XX_DIR_LEN + 1];
int fd;
if (*longpath == '\0') {
/* Create a filename close to PATH_MAX in length */
memset(longname, 'x', XX_DIR_LEN - 1);
longname[XX_DIR_LEN - 1] = '/';
longname[XX_DIR_LEN] = '\0';
count = (PATH_MAX - 3) / XX_DIR_LEN;
for (ii = 0; ii < count; ii++) {
strcat(longpath, longname);
mkdir(longpath, 0755);
}
len = (PATH_MAX - 3) - (count * XX_DIR_LEN);
if (len <= 0)
len = 1;
memset(longname, 'y', len);
longname[len] = '\0';
strcat(longpath, longname);
}
exe_cp(src, longpath);
/*
* Execute as a pre-opened file descriptor, which works whether this is
* a script or not (because the interpreter sees a filename like
* "/dev/fd/20").
*/
fd = open(longpath, O_RDONLY);
if (fd > 0) {
printf("Invoke copy of '%s' via filename of length %zu:\n",
src, strlen(longpath));
fail += check_execveat(fd, "", AT_EMPTY_PATH);
} else {
printf("Failed to open length %zu filename, errno=%d (%s)\n",
strlen(longpath), errno, strerror(errno));
fail++;
}
/*
* Execute as a long pathname relative to ".". If this is a script,
* the interpreter will launch but fail to open the script because its
* name ("/dev/fd/5/xxx....") is bigger than PATH_MAX.
*
* The failure code is usually 127 (POSIX: "If a command is not found,
* the exit status shall be 127."), but some systems give 126 (POSIX:
* "If the command name is found, but it is not an executable utility,
* the exit status shall be 126."), so allow either.
*/
if (is_script)
fail += check_execveat_invoked_rc(dot_dfd, longpath, 0,
127, 126);
else
fail += check_execveat(dot_dfd, longpath, 0);
return fail;
}
static int run_tests(void)
{
int fail = 0;
char *fullname = realpath("execveat", NULL);
char *fullname_script = realpath("script", NULL);
char *fullname_symlink = concat(fullname, ".symlink");
int subdir_dfd = open_or_die("subdir", O_DIRECTORY|O_RDONLY);
int subdir_dfd_ephemeral = open_or_die("subdir.ephemeral",
O_DIRECTORY|O_RDONLY);
int dot_dfd = open_or_die(".", O_DIRECTORY|O_RDONLY);
int dot_dfd_path = open_or_die(".", O_DIRECTORY|O_RDONLY|O_PATH);
int dot_dfd_cloexec = open_or_die(".", O_DIRECTORY|O_RDONLY|O_CLOEXEC);
int fd = open_or_die("execveat", O_RDONLY);
int fd_path = open_or_die("execveat", O_RDONLY|O_PATH);
int fd_symlink = open_or_die("execveat.symlink", O_RDONLY);
int fd_denatured = open_or_die("execveat.denatured", O_RDONLY);
int fd_denatured_path = open_or_die("execveat.denatured",
O_RDONLY|O_PATH);
int fd_script = open_or_die("script", O_RDONLY);
int fd_ephemeral = open_or_die("execveat.ephemeral", O_RDONLY);
int fd_ephemeral_path = open_or_die("execveat.path.ephemeral",
O_RDONLY|O_PATH);
int fd_script_ephemeral = open_or_die("script.ephemeral", O_RDONLY);
int fd_cloexec = open_or_die("execveat", O_RDONLY|O_CLOEXEC);
int fd_script_cloexec = open_or_die("script", O_RDONLY|O_CLOEXEC);
/* Check if we have execveat at all, and bail early if not */
errno = 0;
execveat_(-1, NULL, NULL, NULL, 0);
if (errno == ENOSYS) {
printf("[FAIL] ENOSYS calling execveat - no kernel support?\n");
return 1;
}
/* Change file position to confirm it doesn't affect anything */
lseek(fd, 10, SEEK_SET);
/* Normal executable file: */
/* dfd + path */
fail += check_execveat(subdir_dfd, "../execveat", 0);
fail += check_execveat(dot_dfd, "execveat", 0);
fail += check_execveat(dot_dfd_path, "execveat", 0);
/* absolute path */
fail += check_execveat(AT_FDCWD, fullname, 0);
/* absolute path with nonsense dfd */
fail += check_execveat(99, fullname, 0);
/* fd + no path */
fail += check_execveat(fd, "", AT_EMPTY_PATH);
/* O_CLOEXEC fd + no path */
fail += check_execveat(fd_cloexec, "", AT_EMPTY_PATH);
/* O_PATH fd */
fail += check_execveat(fd_path, "", AT_EMPTY_PATH);
/* Mess with executable file that's already open: */
/* fd + no path to a file that's been renamed */
rename("execveat.ephemeral", "execveat.moved");
fail += check_execveat(fd_ephemeral, "", AT_EMPTY_PATH);
/* fd + no path to a file that's been deleted */
unlink("execveat.moved"); /* remove the file now fd open */
fail += check_execveat(fd_ephemeral, "", AT_EMPTY_PATH);
/* Mess with executable file that's already open with O_PATH */
/* fd + no path to a file that's been deleted */
unlink("execveat.path.ephemeral");
fail += check_execveat(fd_ephemeral_path, "", AT_EMPTY_PATH);
/* Invalid argument failures */
fail += check_execveat_fail(fd, "", 0, ENOENT);
fail += check_execveat_fail(fd, NULL, AT_EMPTY_PATH, EFAULT);
/* Symlink to executable file: */
/* dfd + path */
fail += check_execveat(dot_dfd, "execveat.symlink", 0);
fail += check_execveat(dot_dfd_path, "execveat.symlink", 0);
/* absolute path */
fail += check_execveat(AT_FDCWD, fullname_symlink, 0);
/* fd + no path, even with AT_SYMLINK_NOFOLLOW (already followed) */
fail += check_execveat(fd_symlink, "", AT_EMPTY_PATH);
fail += check_execveat(fd_symlink, "",
AT_EMPTY_PATH|AT_SYMLINK_NOFOLLOW);
/* Symlink fails when AT_SYMLINK_NOFOLLOW set: */
/* dfd + path */
fail += check_execveat_fail(dot_dfd, "execveat.symlink",
AT_SYMLINK_NOFOLLOW, ELOOP);
fail += check_execveat_fail(dot_dfd_path, "execveat.symlink",
AT_SYMLINK_NOFOLLOW, ELOOP);
/* absolute path */
fail += check_execveat_fail(AT_FDCWD, fullname_symlink,
AT_SYMLINK_NOFOLLOW, ELOOP);
/* Shell script wrapping executable file: */
/* dfd + path */
fail += check_execveat(subdir_dfd, "../script", 0);
fail += check_execveat(dot_dfd, "script", 0);
fail += check_execveat(dot_dfd_path, "script", 0);
/* absolute path */
fail += check_execveat(AT_FDCWD, fullname_script, 0);
/* fd + no path */
fail += check_execveat(fd_script, "", AT_EMPTY_PATH);
fail += check_execveat(fd_script, "",
AT_EMPTY_PATH|AT_SYMLINK_NOFOLLOW);
/* O_CLOEXEC fd fails for a script (as script file inaccessible) */
fail += check_execveat_fail(fd_script_cloexec, "", AT_EMPTY_PATH,
ENOENT);
fail += check_execveat_fail(dot_dfd_cloexec, "script", 0, ENOENT);
/* Mess with script file that's already open: */
/* fd + no path to a file that's been renamed */
rename("script.ephemeral", "script.moved");
fail += check_execveat(fd_script_ephemeral, "", AT_EMPTY_PATH);
/* fd + no path to a file that's been deleted */
unlink("script.moved"); /* remove the file while fd open */
fail += check_execveat(fd_script_ephemeral, "", AT_EMPTY_PATH);
/* Rename a subdirectory in the path: */
rename("subdir.ephemeral", "subdir.moved");
fail += check_execveat(subdir_dfd_ephemeral, "../script", 0);
fail += check_execveat(subdir_dfd_ephemeral, "script", 0);
/* Remove the subdir and its contents */
unlink("subdir.moved/script");
unlink("subdir.moved");
/* Shell loads via deleted subdir OK because name starts with .. */
fail += check_execveat(subdir_dfd_ephemeral, "../script", 0);
fail += check_execveat_fail(subdir_dfd_ephemeral, "script", 0, ENOENT);
/* Flag values other than AT_SYMLINK_NOFOLLOW => EINVAL */
fail += check_execveat_fail(dot_dfd, "execveat", 0xFFFF, EINVAL);
/* Invalid path => ENOENT */
fail += check_execveat_fail(dot_dfd, "no-such-file", 0, ENOENT);
fail += check_execveat_fail(dot_dfd_path, "no-such-file", 0, ENOENT);
fail += check_execveat_fail(AT_FDCWD, "no-such-file", 0, ENOENT);
/* Attempt to execute directory => EACCES */
fail += check_execveat_fail(dot_dfd, "", AT_EMPTY_PATH, EACCES);
/* Attempt to execute non-executable => EACCES */
fail += check_execveat_fail(dot_dfd, "Makefile", 0, EACCES);
fail += check_execveat_fail(fd_denatured, "", AT_EMPTY_PATH, EACCES);
fail += check_execveat_fail(fd_denatured_path, "", AT_EMPTY_PATH,
EACCES);
/* Attempt to execute nonsense FD => EBADF */
fail += check_execveat_fail(99, "", AT_EMPTY_PATH, EBADF);
fail += check_execveat_fail(99, "execveat", 0, EBADF);
/* Attempt to execute relative to non-directory => ENOTDIR */
fail += check_execveat_fail(fd, "execveat", 0, ENOTDIR);
fail += check_execveat_pathmax(dot_dfd, "execveat", 0);
fail += check_execveat_pathmax(dot_dfd, "script", 1);
return fail;
}
static void prerequisites(void)
{
int fd;
const char *script = "#!/bin/sh\nexit $*\n";
/* Create ephemeral copies of files */
exe_cp("execveat", "execveat.ephemeral");
exe_cp("execveat", "execveat.path.ephemeral");
exe_cp("script", "script.ephemeral");
mkdir("subdir.ephemeral", 0755);
fd = open("subdir.ephemeral/script", O_RDWR|O_CREAT|O_TRUNC, 0755);
write(fd, script, strlen(script));
close(fd);
}
int main(int argc, char **argv)
{
int ii;
int rc;
const char *verbose = getenv("VERBOSE");
if (argc >= 2) {
/* If we are invoked with an argument, don't run tests. */
const char *in_test = getenv("IN_TEST");
if (verbose) {
printf(" invoked with:");
for (ii = 0; ii < argc; ii++)
printf(" [%d]='%s'", ii, argv[ii]);
printf("\n");
}
/* Check expected environment transferred. */
if (!in_test || strcmp(in_test, "yes") != 0) {
printf("[FAIL] (no IN_TEST=yes in env)\n");
return 1;
}
/* Use the final argument as an exit code. */
rc = atoi(argv[argc - 1]);
fflush(stdout);
} else {
prerequisites();
if (verbose)
envp[1] = "VERBOSE=1";
rc = run_tests();
if (rc > 0)
printf("%d tests failed\n", rc);
}
return rc;
}