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3fd794264e
On some targets using bool in support/check_mem_access.h resulted
in build error due to stdbool.h not being included, fix this.
See 9be489d778 for details.
Reported-by: Joseph Myers <josmyers@redhat.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Implementation of the test verification functions for memory access
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checks.
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Copyright (C) 2025 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 <setjmp.h>
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#include <signal.h>
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#include <stddef.h>
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#include <support/xsignal.h>
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#include "check_mem_access.h"
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static sigjmp_buf sigsegv_jmp_buf;
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static void
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__sigsegv_handler (int signum)
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{
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siglongjmp (sigsegv_jmp_buf, signum);
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}
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bool check_mem_access (const void *addr, bool write)
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{
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/* This is obviously not thread-safe. */
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static bool handler_set_up;
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if (!handler_set_up)
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{
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struct sigaction sa = {
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.sa_handler = __sigsegv_handler,
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.sa_flags = SA_NODEFER,
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};
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sigemptyset (&sa.sa_mask);
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xsigaction (SIGSEGV, &sa, NULL);
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/* Some system generates SIGBUS accessing the guard area when it is
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setup with madvise. */
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xsigaction (SIGBUS, &sa, NULL);
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handler_set_up = true;
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}
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int r = sigsetjmp (sigsegv_jmp_buf, 0);
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if (r == 0)
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{
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if (write)
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*(volatile char *)addr = 'x';
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else
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*(volatile char *)addr;
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return true;
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}
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if (r == SIGSEGV || r == SIGBUS)
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return false;
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return true;
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}
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