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d="scan'208";a="76451401" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu Subject: [PATCH] xen/check-endbr.sh: Explain the purpose of the script Date: Tue, 26 Jul 2022 15:23:28 +0100 Message-ID: <20220726142328.12246-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1658845475657100001 Signed-off-by: Andrew Cooper Acked-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu --- 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 Track= ing) +# 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 instructi= ons. +# This script searches .text for any problematic byte patterns which aren't +# legitimate ENDBR instructions. +# set -e =20 # Pretty-print parameters a little for message --=20 2.11.0