/usr/include/X11/bitmaps/starMask is in xbitmaps 1.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #define starMask_width 16
#define starMask_height 16
#define starMask_x_hot 7
#define starMask_y_hot 7
static char starMask_bits[] = {
0xc0, 0x01, 0xc0, 0x01, 0xdc, 0x1d, 0xfc, 0x1f, 0xfc, 0x1f, 0xf8, 0x0f,
0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0xf8, 0x0f, 0xfc, 0x1f, 0xfc, 0x1f,
0xdc, 0x1d, 0xc0, 0x01, 0xc0, 0x01, 0x00, 0x00};
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