mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 01:40:07 +00:00
88f4b6929c
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>
30 lines
1.1 KiB
C
30 lines
1.1 KiB
C
/* Pointer obfuscation implenentation. Generic (no-op) version.
|
|
Copyright (C) 2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef POINTER_GUARD_H
|
|
#define POINTER_GUARD_H
|
|
|
|
/* Assembler code depends on PTR_MANGLE not being defined for
|
|
optimization purposes. */
|
|
#ifndef __ASSEMBLER__
|
|
# define PTR_MANGLE(x) (void) (x)
|
|
# define PTR_DEMANGLE(x) (void) (x)
|
|
#endif
|
|
|
|
#endif /* POINTER_GUARD_H */
|