Revision ccec44563b18a0ce90e2d4f332784b3cb25c8e9c authored by Paul Mackerras on 05 March 2016, 08:34:39 UTC, committed by Paul Mackerras on 08 March 2016, 02:36:42 UTC
Thomas Huth discovered that a guest could cause a hard hang of a host CPU by setting the Instruction Authority Mask Register (IAMR) to a suitable value. It turns out that this is because when the code was added to context-switch the new special-purpose registers (SPRs) that were added in POWER8, we forgot to add code to ensure that they were restored to a sane value on guest exit. This adds code to set those registers where a bad value could compromise the execution of the host kernel to a suitable neutral value on guest exit. Cc: stable@vger.kernel.org # v3.14+ Fixes: b005255e12a3 Reported-by: Thomas Huth <thuth@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
1 parent 2680d6d
gcc-ld
#!/bin/sh
# run gcc with ld options
# used as a wrapper to execute link time optimizations
# yes virginia, this is not pretty
ARGS="-nostdlib"
while [ "$1" != "" ] ; do
case "$1" in
-save-temps|-m32|-m64) N="$1" ;;
-r) N="$1" ;;
-[Wg]*) N="$1" ;;
-[olv]|-[Ofd]*|-nostdlib) N="$1" ;;
--end-group|--start-group)
N="-Wl,$1" ;;
-[RTFGhIezcbyYu]*|\
--script|--defsym|-init|-Map|--oformat|-rpath|\
-rpath-link|--sort-section|--section-start|-Tbss|-Tdata|-Ttext|\
--version-script|--dynamic-list|--version-exports-symbol|--wrap|-m)
A="$1" ; shift ; N="-Wl,$A,$1" ;;
-[m]*) N="$1" ;;
-*) N="-Wl,$1" ;;
*) N="$1" ;;
esac
ARGS="$ARGS $N"
shift
done
exec $CC $ARGS
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