Update version of MDS advisory

Approved by:	so

share/security/advisories/FreeBSD-SA-19:07.mds.asc

@@ -24,6 +24,13 @@ For general information regarding FreeBSD Security Advisories,
 including descriptions of the fields above, security branches, and the
 following sections, please visit <URL:https://security.FreeBSD.org/>.
 
+0.   Revision history
+
+v1.0   2019-05-14  Initial release.
+v1.1   2019-05-15  Fixed date on microcode update package.
+v1.2   2019-05-15  Userland startup microcode update details added.
+                   Add language specifying which manufacturers is affected.
+
 I.   Background
 
 Modern processors make use of speculative execution, an optimization
@@ -45,11 +52,14 @@ IV.  Workaround
 
 No workaround is available.
 
+Only Intel x86 based processors are affected.  x86 processors from other
+manufacturers (eg, AMD) are not believed to be vulnerable.
+
 Systems with users or processors in different trust domains should disable
 Hyper-Threading by setting the machdep.hyperthreading_allowed tunable to 0:
 
 # echo 'machdep.hyperthreading_allowed=0 >> /boot/loader.conf'
-# shutdown
+# shutdown -r +10min "Security update"
 
 V.   Solution
 
@@ -63,14 +73,17 @@ New CPU microcode may be available in a BIOS update from your system vendor,
 or by installing the devcpu-data package or sysutils/devcpu-data port.
 Ensure that the BIOS update or devcpu-data package is dated after 2019-05-14.
 
-If using the package or port the microcode update can be applied at boot time
-by adding the following lines to the system's /boot/loader.conf:
+If using the package or port the Intel microcode update can be applied at
+boot time (only on FreeBSD 12 and later) by adding the following lines to the
+system's /boot/loader.conf:
 
 cpu_microcode_load="YES"
 cpu_microcode_name="/boot/firmware/intel-ucode.bin"
 
-Microcode updates can also be applied while the system is running.  See
-cpucontrol(8) for details.
+To automatically load microcode during userland startup (supported on all
+FreeBSD versions), add the following to /etc/rc.conf:
+
+microcode_update_enable="YES"
 
 1) To update your vulnerable system via a binary patch:
 
@@ -180,19 +193,19 @@ The latest revision of this advisory is available at
 <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:07.mds.asc>
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