[PATCH 2 of 4] md5: use explicit memzero to avoid optimizations

[Vadim Fedorenko via nginx-devel]

# HG changeset patch
# User Vadim Fedorenko <vadim.fedore...@cdnnow.ru>
# Date 1681771200 -10800
#      Tue Apr 18 01:40:00 2023 +0300
# Node ID 8f8773a3076bdbd91fc7a4e96d7a068f7ff29b09
# Parent  0a1c8cb5c05141f3ea3135d9f01688f7693fc7df
md5: use explicit memzero to avoid optimizations.

GCC11 is optimizing memzero functions in md5 implementation.
Use ngx_explicit_memzero() instead.
---
 src/core/ngx_md5.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff -r 0a1c8cb5c051 -r 8f8773a3076b src/core/ngx_md5.c
--- a/src/core/ngx_md5.c        Tue Apr 18 01:39:32 2023 +0300
+++ b/src/core/ngx_md5.c        Tue Apr 18 01:40:00 2023 +0300
@@ -70,13 +70,13 @@
     free = 64 - used;
 
     if (free < 8) {
-        ngx_memzero(&ctx->buffer[used], free);
+        ngx_explicit_memzero(&ctx->buffer[used], free);
         (void) ngx_md5_body(ctx, ctx->buffer, 64);
         used = 0;
         free = 64;
     }
 
-    ngx_memzero(&ctx->buffer[used], free - 8);
+    ngx_explicit_memzero(&ctx->buffer[used], free - 8);
 
     ctx->bytes <<= 3;
     ctx->buffer[56] = (u_char) ctx->bytes;
@@ -107,7 +107,7 @@
     result[14] = (u_char) (ctx->d >> 16);
     result[15] = (u_char) (ctx->d >> 24);
 
-    ngx_memzero(ctx, sizeof(*ctx));
+    ngx_explicit_memzero(ctx, sizeof(*ctx));
 }
 
 
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