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common/mischelp: use platform memory zeroing function for wipememory

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* common/mischelp.h (wipememory): Replace macro with function
prototype.
(wipememory2): Remove.
* common/mischelp.c (wipememory): New.
* configure.ac (AC_CHECK_FUNCS): Check for 'explicit_bzero'.
--

In new wipememory function, memory is cleared through platform
provided secure memory zeroing function, SecureZeroMemory
or explicit_bzero.

If none of these is available, memset is called through
volatile function pointer to so that compiler won't optimize
away the call.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
This commit is contained in:
Jussi Kivilinna 2018-12-01 13:43:09 +02:00
parent 3a90efb7cf
commit 2a650772b4
3 changed files with 29 additions and 19 deletions
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12
common/mischelp.h
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@ -47,15 +47,9 @@ time_t timegm (struct tm *tm);
#define DIM(v) (sizeof(v)/sizeof((v)[0]))
#define DIMof(type,member) DIM(((type *)0)->member)
/* To avoid that a compiler optimizes certain memset calls away, these
macros may be used instead. */
#define wipememory2(_ptr,_set,_len) do { \
volatile char *_vptr=(volatile char *)(_ptr); \
size_t _vlen=(_len); \
while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
} while(0)
#define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
/* To avoid that a compiler optimizes certain memset calls away,
wipememory function may be used instead. */
void wipememory(void *ptr, size_t len);
/* Include hacks which are mainly required for Slowaris. */
#ifdef GNUPG_COMMON_NEED_AFLOCAL