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Merge pull request #488 from cgzones/secure_zero

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Ensure memory cleaning
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Serge Hallyn 2022-01-03 09:31:43 -06:00 committed by GitHub
commit 51e77b9a96
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2 changed files with 15 additions and 2 deletions
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2
configure.ac
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@ -56,7 +56,7 @@ AC_CHECK_FUNCS(arc4random_buf l64a fchmod fchown fsync futimes \
getutent initgroups lchown lckpwdf lstat lutimes \
setgroups sigaction strchr updwtmp updwtmpx innetgr getpwnam_r \
getpwuid_r getgrnam_r getgrgid_r getspnam_r getaddrinfo ruserok \
dlopen)
dlopen memset_s explicit_bzero)
AC_SYS_LARGEFILE
dnl Checks for typedefs, structures, and compiler characteristics.

15
lib/defines.h
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@ -111,7 +111,20 @@ char *strchr (), *strrchr (), *strtok ();
# endif
#endif /* not TIME_WITH_SYS_TIME */
#define memzero(ptr, size) memset((void *)(ptr), 0, (size))
#ifdef HAVE_MEMSET_S
# define memzero(ptr, size) memset_s((ptr), 0, (size))
#elif defined HAVE_EXPLICIT_BZERO /* !HAVE_MEMSET_S */
# define memzero(ptr, size) explicit_bzero((ptr), (size))
#else /* !HAVE_MEMSET_S && HAVE_EXPLICIT_BZERO */
static inline void memzero(void *ptr, size_t size)
{
volatile unsigned char * volatile p = ptr;
while (size--) {
*p++ = '\0';
}
}
#endif /* !HAVE_MEMSET_S && !HAVE_EXPLICIT_BZERO */
#define strzero(s) memzero(s, strlen(s)) /* warning: evaluates twice */
#ifdef HAVE_DIRENT_H /* DIR_SYSV */