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Add check_mem_access(addr) function to check if memory at addr can be written or read returning false if memory is not accessible. This function changes signal handler for SIGSEGV and SIGBUS signals when it is called first, and it is not thread-safe. Co-authored-by: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
37 lines
1.4 KiB
C
37 lines
1.4 KiB
C
/* Test verification functions for memory access 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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#ifndef SUPPORT_CHECK_MEM_ACCESS_H
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#define SUPPORT_CHECK_MEM_ACCESS_H
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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/* To check if the a memory region is inaccessible, this function tries
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read / write on the provided address ADDR and checks if a SIGSEGV is
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generated. This function is not thread-safe and it changes signal
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handlers for SIGSEGV and SIGBUS.
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If WRITE is true, only the write operation is checked, otherwise only
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the read operation is checked. */
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bool check_mem_access (const void *addr, bool write);
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__END_DECLS
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#endif // SUPPORT_CHECK_MEM_ACCESS_H
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