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>
---
 libio/iofopncook.c | 1 +
 libio/iofwide.c    | 2 +-
 libio/libioP.h     | 1 +
 libio/vtables.c    | 1 +
 4 files changed, 4 insertions(+), 1 deletion(-)

(limited to 'libio')

diff --git a/libio/iofopncook.c b/libio/iofopncook.c
index e108ad2..a7db4ef 100644
--- a/libio/iofopncook.c
+++ b/libio/iofopncook.c
@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <shlib-compat.h>
+#include <pointer_guard.h>
 
 static ssize_t
 _IO_cookie_read (FILE *fp, void *buf, ssize_t size)
diff --git a/libio/iofwide.c b/libio/iofwide.c
index 01616e0..1ce685f 100644
--- a/libio/iofwide.c
+++ b/libio/iofwide.c
@@ -36,7 +36,7 @@
 #include <wcsmbs/wcsmbsload.h>
 #include <iconv/gconv_int.h>
 #include <shlib-compat.h>
-#include <sysdep.h>
+#include <pointer_guard.h>
 
 
 /* Return orientation of stream.  If mode is nonzero try to change
diff --git a/libio/libioP.h b/libio/libioP.h
index ba4fdbd..dac3de7 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -47,6 +47,7 @@
 #include "iolibio.h"
 
 #include <shlib-compat.h>
+#include <pointer_guard.h>
 
 /* For historical reasons this is the name of the sysdeps header that
    adjusts the libio configuration.  */
diff --git a/libio/vtables.c b/libio/vtables.c
index 50acab7..32459e4 100644
--- a/libio/vtables.c
+++ b/libio/vtables.c
@@ -20,6 +20,7 @@
 #include <libioP.h>
 #include <stdio.h>
 #include <ldsodefs.h>
+#include <pointer_guard.h>
 
 #ifdef SHARED
 
-- 
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