char *
__getcwd_chk (char *buf, size_t size, size_t buflen)
{
- char *res = __getcwd (buf, MIN (size, buflen));
- if (res == NULL && errno == ERANGE && size > buflen)
+ if (size > buflen)
__chk_fail ();
- return res;
+
+ return __getcwd (buf, size);
}
ssize_t
__pread64_chk (int fd, void *buf, size_t nbytes, off64_t offset, size_t buflen)
{
- /* In case NBYTES is greater than BUFLEN, we read BUFLEN+1 bytes.
- This might overflow the buffer but the damage is reduced to just
- one byte. And the program will terminate right away. */
- ssize_t n = __pread64 (fd, buf, offset, MIN (nbytes, buflen + 1));
- if (n > 0 && (size_t) n > buflen)
+ if (nbytes > buflen)
__chk_fail ();
- return n;
+
+ return __pread64 (fd, buf, offset, MIN (nbytes, buflen + 1));
}
ssize_t
__readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
{
- /* In case LEN is greater than BUFLEN, we read BUFLEN+1 bytes.
- This might overflow the buffer but the damage is reduced to just
- one byte. And the program will terminate right away. */
+ if (len > buflen)
+ __chk_fail ();
+
#ifdef HAVE_INLINED_SYSCALLS
- int n = INLINE_SYSCALL (readlink, 3, path, buf, MIN (len, buflen + 1));
+ return INLINE_SYSCALL (readlink, 3, path, buf, MIN (len, buflen + 1));
#else
- int n = __readlink (path, buf, MIN (len, buflen + 1));
+ return __readlink (path, buf, MIN (len, buflen + 1));
#endif
- if (n > 0 && (size_t) n > buflen)
- __chk_fail ();
- return n;
}