72 lines
2 KiB
C
72 lines
2 KiB
C
/*
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* Zeroize application for debugger-driven testing
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*
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* This is a simple test application used for debugger-driven testing to check
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* whether calls to mbedtls_platform_zeroize() are being eliminated by compiler
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* optimizations. This application is used by the GDB script at
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* tests/scripts/test_zeroize.gdb: the script sets a breakpoint at the last
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* return statement in the main() function of this program. The debugger
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* facilities are then used to manually inspect the memory and verify that the
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* call to mbedtls_platform_zeroize() was not eliminated.
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#include "mbedtls/build_info.h"
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#include <stdio.h>
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#include "mbedtls/platform.h"
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#include "mbedtls/platform_util.h"
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#define BUFFER_LEN 1024
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void usage(void)
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{
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mbedtls_printf("Zeroize is a simple program to assist with testing\n");
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mbedtls_printf("the mbedtls_platform_zeroize() function by using the\n");
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mbedtls_printf("debugger. This program takes a file as input and\n");
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mbedtls_printf("prints the first %d characters. Usage:\n\n", BUFFER_LEN);
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mbedtls_printf(" zeroize <FILE>\n");
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}
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int main(int argc, char **argv)
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{
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int exit_code = MBEDTLS_EXIT_FAILURE;
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FILE *fp;
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char buf[BUFFER_LEN];
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char *p = buf;
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char *end = p + BUFFER_LEN;
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int c;
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if (argc != 2) {
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mbedtls_printf("This program takes exactly 1 argument\n");
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usage();
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mbedtls_exit(exit_code);
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}
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fp = fopen(argv[1], "r");
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if (fp == NULL) {
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mbedtls_printf("Could not open file '%s'\n", argv[1]);
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mbedtls_exit(exit_code);
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}
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while ((c = fgetc(fp)) != EOF && p < end - 1) {
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*p++ = (char) c;
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}
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*p = '\0';
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if (p - buf != 0) {
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mbedtls_printf("%s\n", buf);
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exit_code = MBEDTLS_EXIT_SUCCESS;
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} else {
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mbedtls_printf("The file is empty!\n");
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}
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fclose(fp);
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mbedtls_platform_zeroize(buf, sizeof(buf));
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mbedtls_exit(exit_code); // GDB_BREAK_HERE -- don't remove this comment!
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}
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