linux-user: fix readlink handling with magic exe symlink

The current code always returns the length of the path when it should
be returning the number of bytes it wrote to the output string.

Further, readlink is not supposed to append a NUL byte, but the current
snprintf logic will always do just that.

Even further, if you pass in a length of 0, you're suppoesd to get back
an error (EINVAL), but the current logic just returns 0.

Further still, if there was an error reading the symlink, we should not
go ahead and try to read the target buffer as it is garbage.

Simple test for the first two issues:
$ cat test.c
int main() {
    char buf[50];
    size_t len;
    for (len = 0; len < 10; ++len) {
        memset(buf, '!', sizeof(buf));
        ssize_t ret = readlink("/proc/self/exe", buf, len);
        buf[20] = '\0';
        printf("readlink(/proc/self/exe, {%s}, %zu) = %zi\n", buf, len, ret);
    }
    return 0;
}

Now compare the output of the native:
$ gcc test.c -o /tmp/x
$ /tmp/x
$ strace /tmp/x

With what qemu does:
$ armv7a-cros-linux-gnueabi-gcc test.c -o /tmp/x -static
$ qemu-arm /tmp/x
$ qemu-arm -strace /tmp/x
Signed-off-by: NMike Frysinger <vapier@chromium.org>
Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>

linux-user/syscall.c

@@ -6636,11 +6636,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
             if (!p || !p2) {
                 ret = -TARGET_EFAULT;
+            } else if (!arg3) {
+                /* Short circuit this for the magic exe check. */
+                ret = -TARGET_EINVAL;
             } else if (is_proc_myself((const char *)p, "exe")) {
                 char real[PATH_MAX], *temp;
                 temp = realpath(exec_path, real);
-                ret = temp == NULL ? get_errno(-1) : strlen(real) ;
-                snprintf((char *)p2, arg3, "%s", real);
+                /* Return value is # of bytes that we wrote to the buffer. */
+                if (temp == NULL) {
+                    ret = get_errno(-1);
+                } else {
+                    /* Don't worry about sign mismatch as earlier mapping
+                     * logic would have thrown a bad address error. */
+                    ret = MIN(strlen(real), arg3);
+                    /* We cannot NUL terminate the string. */
+                    memcpy(p2, real, ret);
+                }
             } else {
                 ret = get_errno(readlink(path(p), p2, arg3));
             }