Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com> --- CC: Jan Beulich <jbeul...@suse.com> CC: Roger Pau Monné <roger....@citrix.com> CC: Wei Liu <w...@xen.org> --- xen/tools/check-endbr.sh | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/xen/tools/check-endbr.sh b/xen/tools/check-endbr.sh index b97684ac25e9..bf153a570db4 100755 --- a/xen/tools/check-endbr.sh +++ b/xen/tools/check-endbr.sh @@ -2,6 +2,15 @@ # # Usage ./$0 xen-syms # +# When CET-IBT (Control-flow Enforcement Technology, Indirect Branch Tracking) +# is active, ENDBR instructions mark legal indirect branch targets in the +# .text section. +# +# However x86 is a variable length instruction set so the same byte pattern +# can exist embedded in other instructions, or crossing multiple instructions. +# This script searches .text for any problematic byte patterns which aren't +# legitimate ENDBR instructions. +# set -e # Pretty-print parameters a little for message -- 2.11.0
