OpenBSD/xenocara 6BLWBny — lib/mesa/src/gallium/winsys/sw/dri dri_sw_winsys.c, lib/mesa/src/gallium/winsys/sw/xlib xlib_sw_winsys.c
Call shmget() with permission 0600 instead of 0777
From Brian Paul
02c3dad0f3b4d26e0faa5cc51d06bc50d693dcdc in mainline Mesa
"A security advisory (TALOS-2019-0857/CVE-2019-5068) found that
creating shared memory regions with permission mode 0777 could allow
any user to access that memory. Several Mesa drivers use shared-
memory XImages to implement back buffers for improved performance.
This path changes the shmget() calls to use 0600 (user r/w).
Tested with legacy Xlib driver and llvmpipe."
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