From 88f4b6929c26f9240a4b0b7dcc62922f02544a09 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Tue, 18 Oct 2022 17:00:07 +0200
Subject: Introduce <pointer_guard.h>, extracted from <sysdep.h>

This allows us to define a generic no-op version of PTR_MANGLE and
PTR_DEMANGLE.  In the future, we can use PTR_MANGLE and PTR_DEMANGLE
unconditionally in C sources, avoiding an unintended loss of hardening
due to missing include files or unlucky header inclusion ordering.

In i386 and x86_64, we can avoid a <tls.h> dependency in the C
code by using the computed constant from <tcb-offsets.h>.  <sysdep.h>
no longer includes these definitions, so there is no cyclic dependency
anymore when computing the <tcb-offsets.h> constants.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---
 sysdeps/s390/jmpbuf-unwind.h     | 1 +
 sysdeps/s390/s390-32/__longjmp.c | 1 +
 sysdeps/s390/s390-32/setjmp.S    | 1 +
 sysdeps/s390/s390-64/__longjmp.c | 1 +
 sysdeps/s390/s390-64/setjmp.S    | 1 +
 5 files changed, 5 insertions(+)

(limited to 'sysdeps/s390')

diff --git a/sysdeps/s390/jmpbuf-unwind.h b/sysdeps/s390/jmpbuf-unwind.h
index b4ff8da..10b37f0 100644
--- a/sysdeps/s390/jmpbuf-unwind.h
+++ b/sysdeps/s390/jmpbuf-unwind.h
@@ -21,6 +21,7 @@
 #include <unwind.h>
 #include <bits/wordsize.h>
 #include <sysdep.h>
+#include <pointer_guard.h>
 
 
 /* Test if longjmp to JMPBUF would unwind the frame
diff --git a/sysdeps/s390/s390-32/__longjmp.c b/sysdeps/s390/s390-32/__longjmp.c
index 09a3a2b..83d4232 100644
--- a/sysdeps/s390/s390-32/__longjmp.c
+++ b/sysdeps/s390/s390-32/__longjmp.c
@@ -17,6 +17,7 @@
 
 #include <errno.h>
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <setjmp.h>
 #include <bits/setjmp.h>
 #include <stdlib.h>
diff --git a/sysdeps/s390/s390-32/setjmp.S b/sysdeps/s390/s390-32/setjmp.S
index c15c7bb..0870423 100644
--- a/sysdeps/s390/s390-32/setjmp.S
+++ b/sysdeps/s390/s390-32/setjmp.S
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #define _ASM
 #define _SETJMP_H
 #include <bits/setjmp.h>
diff --git a/sysdeps/s390/s390-64/__longjmp.c b/sysdeps/s390/s390-64/__longjmp.c
index 2ca96e1..9fe4939 100644
--- a/sysdeps/s390/s390-64/__longjmp.c
+++ b/sysdeps/s390/s390-64/__longjmp.c
@@ -17,6 +17,7 @@
 
 #include <errno.h>
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <setjmp.h>
 #include <bits/setjmp.h>
 #include <stdlib.h>
diff --git a/sysdeps/s390/s390-64/setjmp.S b/sysdeps/s390/s390-64/setjmp.S
index 6dcd77d..5c59f57 100644
--- a/sysdeps/s390/s390-64/setjmp.S
+++ b/sysdeps/s390/s390-64/setjmp.S
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #define _ASM
 #define _SETJMP_H
 #include <bits/setjmp.h>
-- 
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