mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-30 03:18:20 +00:00
e821104237
When building for windows on a case-sensitive system, mingw always comes with a lower-case windows.h
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#ifndef __STDC_WANT_LIB_EXT1__
|
|
#define __STDC_WANT_LIB_EXT1__ 1 // C11's bounds-checking interface.
|
|
#endif
|
|
#include <string.h>
|
|
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
#ifdef __unix__
|
|
#include <strings.h>
|
|
#include <sys/param.h>
|
|
#endif
|
|
|
|
// C11's bounds-checking interface.
|
|
#if defined(__STDC_LIB_EXT1__)
|
|
#define HAVE_MEMSET_S 1
|
|
#endif
|
|
|
|
// GNU C Library version 2.25 or later.
|
|
#if defined(__GLIBC__) && \
|
|
(__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25))
|
|
#define HAVE_EXPLICIT_BZERO 1
|
|
#endif
|
|
|
|
// Newlib
|
|
#if defined(__NEWLIB__)
|
|
#define HAVE_EXPLICIT_BZERO 1
|
|
#endif
|
|
|
|
// FreeBSD version 11.0 or later.
|
|
#if defined(__FreeBSD__) && __FreeBSD_version >= 1100037
|
|
#define HAVE_EXPLICIT_BZERO 1
|
|
#endif
|
|
|
|
// OpenBSD version 5.5 or later.
|
|
#if defined(__OpenBSD__) && OpenBSD >= 201405
|
|
#define HAVE_EXPLICIT_BZERO 1
|
|
#endif
|
|
|
|
// NetBSD version 7.2 or later.
|
|
#if defined(__NetBSD__) && __NetBSD_Version__ >= 702000000
|
|
#define HAVE_EXPLICIT_MEMSET 1
|
|
#endif
|
|
|
|
// Adapted from
|
|
// https://github.com/jedisct1/libsodium/blob/1647f0d53ae0e370378a9195477e3df0a792408f/src/libsodium/sodium/utils.c#L102-L130
|
|
|
|
void memzero(void *const pnt, const size_t len) {
|
|
#ifdef _WIN32
|
|
SecureZeroMemory(pnt, len);
|
|
#elif defined(HAVE_MEMSET_S)
|
|
memset_s(pnt, (rsize_t)len, 0, (rsize_t)len);
|
|
#elif defined(HAVE_EXPLICIT_BZERO)
|
|
explicit_bzero(pnt, len);
|
|
#elif defined(HAVE_EXPLICIT_MEMSET)
|
|
explicit_memset(pnt, 0, len);
|
|
#else
|
|
volatile unsigned char *volatile pnt_ = (volatile unsigned char *volatile)pnt;
|
|
size_t i = (size_t)0U;
|
|
|
|
while (i < len) {
|
|
pnt_[i++] = 0U;
|
|
}
|
|
#endif
|
|
|
|
// explicitly mark the memory as overwritten for the Clang MemorySanitizer
|
|
// this is only included at compile time if MemorySanitizer is enabled and
|
|
// should not come with any downsides during regular builds
|
|
#if defined(__has_feature)
|
|
#if __has_feature(memory_sanitizer)
|
|
memset(pnt, 0, len);
|
|
#endif
|
|
#endif
|
|
}
|