Comment 5 for bug 2053134

__fortified_attr_access seems to be defined incorrectly for _FORTIFY_SOURCE==3.
The documentation for the size-index of access attribute (https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-access-function-attribute) has the following:
```
When no size-index argument is specified, the pointer argument must be either null or point to a space that is suitably aligned and large for __at least one object__ of the referenced type (this implies that a past-the-end pointer is not a valid argument).
```

Notice the __at least__ part here. That means the definition of __fortified_attr_access is wrong when _FORTIFY_SOURCE==3, when passing around 0 size structs.

An example is:
```

#include <stdio.h>
#include <unistd.h>

int main(void) {
    struct test_st {};
    int fd = 0;
    int count = 0;

    struct test_st test_info[16];

    count = read(fd, test_info, sizeof(test_info));
    return(0);
}
```

With _FORTIFY_SOURCE==3 we get:
 __attribute__ ((__access__ (__write_only__, 2)))

Which means the size has to be at least 1 but test_info has size of 0 and we are passing a size of 0 to read even.

This is moved from GCC bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113922 .