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authorFlorian Weimer <fweimer@redhat.com>2022-10-18 17:00:07 +0200
committerFlorian Weimer <fweimer@redhat.com>2022-10-18 17:03:55 +0200
commit88f4b6929c26f9240a4b0b7dcc62922f02544a09 (patch)
tree72acb4a359d3ec56729a910386bd1a002bd69e3c /sysdeps/nios2
parent246f37d6b1c4c6c0a6365df8783e62e3adf208e8 (diff)
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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>
Diffstat (limited to 'sysdeps/nios2')
-rw-r--r--sysdeps/nios2/__longjmp.S1
-rw-r--r--sysdeps/nios2/jmpbuf-offsets.h1
-rw-r--r--sysdeps/nios2/setjmp.S1
3 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/nios2/__longjmp.S b/sysdeps/nios2/__longjmp.S
index 214901d67d..13695e25a6 100644
--- a/sysdeps/nios2/__longjmp.S
+++ b/sysdeps/nios2/__longjmp.S
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <jmpbuf-offsets.h>
 
 /* __longjmp(jmpbuf, val) */
diff --git a/sysdeps/nios2/jmpbuf-offsets.h b/sysdeps/nios2/jmpbuf-offsets.h
index a13aa76c16..76fea64ffe 100644
--- a/sysdeps/nios2/jmpbuf-offsets.h
+++ b/sysdeps/nios2/jmpbuf-offsets.h
@@ -32,6 +32,7 @@
 #include <setjmp.h>
 #include <stdint.h>
 #include <sysdep.h>
+#include <pointer_guard.h>
 
 static inline uintptr_t __attribute__ ((unused))
 _jmpbuf_sp (__jmp_buf jmpbuf)
diff --git a/sysdeps/nios2/setjmp.S b/sysdeps/nios2/setjmp.S
index 0aa5b23d4f..ec75108b87 100644
--- a/sysdeps/nios2/setjmp.S
+++ b/sysdeps/nios2/setjmp.S
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <jmpbuf-offsets.h>
 
 	.text