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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>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <stdlib.h>
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#include "exit.h"
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#include <pointer_guard.h>
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/* Register a function to be called by exit. */
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int
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__on_exit (void (*func) (int status, void *arg), void *arg)
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{
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struct exit_function *new;
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/* As a QoI issue we detect NULL early with an assertion instead
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of a SIGSEGV at program exit when the handler is run (bug 20544). */
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assert (func != NULL);
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__libc_lock_lock (__exit_funcs_lock);
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new = __new_exitfn (&__exit_funcs);
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if (new == NULL)
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{
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__libc_lock_unlock (__exit_funcs_lock);
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return -1;
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}
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#ifdef PTR_MANGLE
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PTR_MANGLE (func);
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#endif
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new->func.on.fn = func;
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new->func.on.arg = arg;
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new->flavor = ef_on;
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__libc_lock_unlock (__exit_funcs_lock);
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return 0;
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}
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weak_alias (__on_exit, on_exit)
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