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libc: check path pointer in file I/O functions

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Fixes #4088
This commit is contained in:
Josef Söntgen 2021-04-23 17:53:25 +02:00 committed by Norman Feske
parent 33a64f79dc
commit 8f30fc993d
1 changed files with 33 additions and 0 deletions
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33
repos/libports/src/lib/libc/file_operations.cc
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@ -226,6 +226,9 @@ static void resolve_symlinks_except_last_element(char const *path, Absolute_path
extern "C" int access(const char *path, int amode)
{
if (!path)
return Errno(EFAULT);
try {
Absolute_path resolved_path;
resolve_symlinks(path, resolved_path);
@ -239,6 +242,9 @@ extern "C" int access(const char *path, int amode)
extern "C" int chdir(const char *path)
{
if (!path)
return Errno(EFAULT);
struct stat stat_buf;
if ((stat(path, &stat_buf) == -1) ||
(!S_ISDIR(stat_buf.st_mode))) {
@ -338,6 +344,9 @@ __SYS_(int, fstat, (int libc_fd, struct stat *buf),
__SYS_(int, fstatat, (int libc_fd, char const *path, struct stat *buf, int flags),
{
if (!path)
return Errno(EFAULT);
if (*path == '/') {
if (flags & AT_SYMLINK_NOFOLLOW)
return lstat(path, buf);
@ -394,6 +403,9 @@ __SYS_(::off_t, lseek, (int libc_fd, ::off_t offset, int whence), {
extern "C" int lstat(const char *path, struct stat *buf)
{
if (!path)
return Errno(EFAULT);
try {
Absolute_path resolved_path;
resolve_symlinks_except_last_element(path, resolved_path);
@ -407,6 +419,9 @@ extern "C" int lstat(const char *path, struct stat *buf)
extern "C" int mkdir(const char *path, mode_t mode)
{
if (!path)
return Errno(EFAULT);
try {
Absolute_path resolved_path;
resolve_symlinks_except_last_element(path, resolved_path);
@ -519,6 +534,9 @@ __SYS_(int, msync, (void *start, ::size_t len, int flags),
__SYS_(int, open, (const char *pathname, int flags, ...),
{
if (!pathname)
return Errno(EFAULT);
Absolute_path resolved_path;
Plugin *plugin;
@ -564,6 +582,9 @@ __SYS_(int, open, (const char *pathname, int flags, ...),
__SYS_(int, openat, (int libc_fd, const char *path, int flags, ...),
{
if (!path)
return Errno(EFAULT);
va_list ap;
va_start(ap, flags);
mode_t mode = va_arg(ap, unsigned);
@ -633,6 +654,9 @@ __SYS_(ssize_t, read, (int libc_fd, void *buf, ::size_t count), {
extern "C" ssize_t readlink(const char *path, char *buf, ::size_t bufsiz)
{
if (!path)
return Errno(EFAULT);
try {
Absolute_path resolved_path;
resolve_symlinks_except_last_element(path, resolved_path);
@ -645,6 +669,9 @@ extern "C" ssize_t readlink(const char *path, char *buf, ::size_t bufsiz)
extern "C" int rename(const char *oldpath, const char *newpath)
{
if (!oldpath || !newpath)
return Errno(EFAULT);
try {
Absolute_path resolved_oldpath, resolved_newpath;
resolve_symlinks_except_last_element(oldpath, resolved_oldpath);
@ -662,6 +689,9 @@ extern "C" int rename(const char *oldpath, const char *newpath)
extern "C" int rmdir(const char *path)
{
if (!path)
return Errno(EFAULT);
try {
Absolute_path resolved_path;
resolve_symlinks_except_last_element(path, resolved_path);
@ -686,6 +716,9 @@ extern "C" int rmdir(const char *path)
extern "C" int stat(const char *path, struct stat *buf)
{
if (!path)
return Errno(EFAULT);
try {
Absolute_path resolved_path;
resolve_symlinks(path, resolved_path);