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#include <assert.h> /* assert */
#include <fcntl.h> /* O_CREAT */
#include <limits.h> /* NGROUPS_MAX */
#include <stddef.h> /* NULL, size_t */
#include <unistd.h> /* confstr, getcwd, getgroups, ... */
#include <errno.h> /* ENOSYS, ENOMEM */
#include <stdlib.h> /* calloc */
#include <dlfcn.h> /* dlsym */
#include <string.h> /* strcmp */
#include "alias.h" /* alias */
/**
* Get configurable variables, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---confstr-chk-1.html
*/
size_t __confstr_chk(int name, char *buf, size_t len, size_t buflen)
{
assert(buf != NULL ? buflen >= len : len == 0);
return confstr(name, buf, len);
}
/**
* Get the pathname of the current working directory, with buffer overflow
* checking.
*
* LSB 5.0: LSB-Core-generic/baselib---getcwd-chk-1.html
*/
char *__getcwd_chk(char *buf, size_t len, size_t buflen)
{
assert(buf != NULL);
assert(buflen >= len);
return getcwd(buf, len);
}
/**
* Get supplementary group IDs, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---getgroups-chk-1.html
*/
int __getgroups_chk(int gidsetsize, gid_t *grouplist, size_t listlen)
{
assert(grouplist != NULL);
assert(listlen / sizeof(*grouplist) >= (size_t) gidsetsize);
return getgroups(gidsetsize, grouplist);
}
/**
* Get name of current host, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---gethostname-chk-1.html
*/
int __gethostname_chk(char *name, size_t namelen, size_t buflen)
{
assert(name != NULL);
assert(buflen >= namelen);
return gethostname(name, namelen);
}
/**
* Get login name, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---getlogin-r-chk-1.html
*/
int __getlogin_r_chk(char *name, size_t namelen, size_t buflen)
{
assert(name != NULL);
assert(buflen >= namelen);
return getlogin_r(name, namelen);
}
/**
* Get memory page size.
*
* LSB 5.0: LSB-Core-generic/baselib---getpagesize.html
*/
int __getpagesize(void)
{
return getpagesize();
}
/**
* Get the process group ID for a process.
*
* LSB 5.0: LSB-Core-generic/baselib---getpgid-1.html
*/
pid_t __getpgid(pid_t pid)
{
return getpgid(pid);
}
int __open_2(const char *path, int oflag)
{
assert(!(oflag & O_CREAT));
return open(path, oflag);
}
alias(__open_2, __open64_2);
/**
* Read from a file, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---pread-chk-1.html
*/
ssize_t __pread_chk(int fd, void *buf, size_t nbytes, off_t offset,
size_t buflen)
{
assert(buf != NULL);
assert(buflen >= nbytes);
return pread(fd, buf, nbytes, offset);
}
alias(__pread_chk, __pread64_chk);
/**
* Read from a file, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---read-chk-1.html
*/
ssize_t __read_chk(int fd, void *buf, size_t nbytes, size_t buflen)
{
assert(buf != NULL);
assert(buflen >= nbytes);
return read(fd, buf, nbytes);
}
/**
* Read the contents of a symbolic link, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---readlink-chk-1.html
*/
ssize_t __readlink_chk(const char *path, char *buf, size_t len, size_t buflen)
{
assert(buf != NULL);
assert(buflen >= len);
return readlink(path, buf, len);
}
/**
* Get configurable system variables.
*
* LSB 5.0: LSB-Core-generic/baselib---sysconf.html
*/
long __sysconf(int name)
{
return sysconf(name);
}
/**
* Find the pathname of a terminal, with buffer overflow checking.
*
* LSB 5.0: LSB-Core-generic/baselib---ttyname-r-chk-1.html
*/
int __ttyname_r_chk(int fd, char *name, size_t namelen, size_t buflen)
{
assert(name != NULL);
assert(buflen >= namelen);
return ttyname_r(fd, name, namelen);
}
/**
* Test whether a process is in a group.
*/
int group_member(gid_t gid)
{
gid_t groups[NGROUPS_MAX];
int ngroups = getgroups(NGROUPS_MAX, groups);
for (int i = 0; i < ngroups; ++i) {
if (groups[i] == gid) {
return 1;
}
}
return 0;
}
#ifndef LOADER
#error LOADER must be defined
#endif
static int (*real_execve)(const char *pathname, char *const argv[], char *const envp[]);
int execve(const char *pathname, char *const argv[], char *const envp[]) {
if(real_execve == NULL) {
real_execve = dlsym(RTLD_NEXT, "execve");
if(real_execve == NULL) {
errno = ENOSYS;
return -1;
}
}
if(!strcmp(pathname, "/proc/self/exe")) {
char **new_argv;
char target[PATH_MAX] = "";
int argc = 0, i = 0;
while(argv[i++] != 0) argc++;
i = readlink("/proc/self/exe", target, sizeof(target));
if(i < 0 || i == sizeof(target)) {
errno = ENOMEM;
return -1;
}
new_argv = calloc(argc + 6, sizeof(char *));
new_argv[0] = LOADER;
new_argv[1] = "--argv0";
new_argv[2] = argv[0];
new_argv[3] = "--preload";
new_argv[4] = "/lib/libgcompat.so.0";
new_argv[5] = target;
for(int j = 1, i = 6; j < argc; ++i, ++j) {
new_argv[i] = argv[j];
}
return execve(LINKER, new_argv, envp);
}
return real_execve(pathname, argv, envp);
}
extern char **environ;
int execv(const char *pathname, char *const argv[]) {
return execve(pathname, argv, environ);
}
int execvp(const char *file, char *const argv[]) {
return execv(file, argv);
}
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