openssl: mark assembler sections as call targets for PAC/BTI support on aarch64

The assembler sections in OpenSSL were not marked as valid call targets,
so branch protection could not be enabled for libcrypto.so.

(From OE-Core rev: 4bf06bc5487da05e6b4a4895e5ca2da65cdc25d8)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 36 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/openssl/openssl/aarch64-bti.patch b/meta/recipes-connectivity/openssl/openssl/aarch64-bti.patch
new file mode 100644
index 0000000000..2a16debb76
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl/aarch64-bti.patch
@@ -0,0 +1,35 @@
+From ad347c9ff0fd93bdd2fa2085611c65b88e94829f Mon Sep 17 00:00:00 2001
+From: "fangming.fang" <fangming.fang@arm.com>
+Date: Thu, 7 Dec 2023 06:17:51 +0000
+Subject: [PATCH] Enable BTI feature for md5 on aarch64
+
+Fixes: #22959
+
+Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
+Reviewed-by: Tomas Mraz <tomas@openssl.org>
+(Merged from https://github.com/openssl/openssl/pull/22971)
+
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ crypto/md5/asm/md5-aarch64.pl | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/crypto/md5/asm/md5-aarch64.pl b/crypto/md5/asm/md5-aarch64.pl
+index 3200a0fa9bff0..5a8608069691d 100755
+--- a/crypto/md5/asm/md5-aarch64.pl
++++ b/crypto/md5/asm/md5-aarch64.pl
+@@ -28,10 +28,13 @@
+ *STDOUT=*OUT;
+ 
+ $code .= <<EOF;
++#include "arm_arch.h"
++
+ .text
+ .globl  ossl_md5_block_asm_data_order
+ .type   ossl_md5_block_asm_data_order,\@function
+ ossl_md5_block_asm_data_order:
++        AARCH64_VALID_CALL_TARGET
+         // Save all callee-saved registers
+         stp     x19,x20,[sp,#-80]!
+         stp     x21,x22,[sp,#16]
diff --git a/meta/recipes-connectivity/openssl/openssl_3.2.0.bb b/meta/recipes-connectivity/openssl/openssl_3.2.0.bb
index ab0562bd73..d041d2d214 100644
--- a/meta/recipes-connectivity/openssl/openssl_3.2.0.bb
+++ b/meta/recipes-connectivity/openssl/openssl_3.2.0.bb
@@ -12,6 +12,7 @@ SRC_URI = "http://www.openssl.org/source/openssl-${PV}.tar.gz \
            file://0001-buildinfo-strip-sysroot-and-debug-prefix-map-from-co.patch \
            file://0001-Configure-do-not-tweak-mips-cflags.patch \
            file://0001-Added-handshake-history-reporting-when-test-fails.patch \
+           file://aarch64-bti.patch \
            "
 
 SRC_URI:append:class-nativesdk = " \