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Introduce <pointer_guard.h>, extracted from <sysdep.h>

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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>
This commit is contained in:
Florian Weimer
2022-10-18 17:00:07 +02:00
parent 246f37d6b1
commit 88f4b6929c
131 changed files with 939 additions and 531 deletions
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2
stdlib/cxa_finalize.c
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@@ -19,7 +19,7 @@
#include <stdlib.h>
#include "exit.h"
#include <register-atfork.h>
#include <sysdep.h>
#include <pointer_guard.h>
#include <stdint.h>
/* If D is non-NULL, call all functions registered with `__cxa_atexit'