argon2: add upstream patches

* Wait for already running threads if a thread creation failed.
* use explicit_bzero() to clear memory

srcpkgs/argon2/patches/explicit-bzero.patch

@@ -0,0 +1,34 @@
+# the idea is picked up from upstream/master
+# (80dca8559b929a9a08f4344d7dcda0d61677ef9a)
+# but the patch is simplified to always use `explicit_bzero()`, so it works
+# with musl too
+
+--- src/core.c
++++ src/core.c
+@@ -25,6 +25,9 @@
+ #endif
+ #define VC_GE_2005(version) (version >= 1400)
+ 
++/* for explicit_bzero() */
++#define _DEFAULT_SOURCE
++
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+@@ -121,16 +124,7 @@
+ }
+ 
+ void NOT_OPTIMIZED secure_wipe_memory(void *v, size_t n) {
+-#if defined(_MSC_VER) && VC_GE_2005(_MSC_VER)
+-    SecureZeroMemory(v, n);
+-#elif defined memset_s
+-    memset_s(v, n, 0, n);
+-#elif defined(__OpenBSD__)
+     explicit_bzero(v, n);
+-#else
+-    static void *(*const volatile memset_sec)(void *, int, size_t) = &memset;
+-    memset_sec(v, 0, n);
+-#endif
+ }
+ 
+ /* Memory clear flag defaults to true. */

srcpkgs/argon2/patches/wait-for-running-threads.patch

@@ -0,0 +1,40 @@
+# picked from upstream/master
+
+From cfa4385e728116989ad88b4be7c23b4868422778 Mon Sep 17 00:00:00 2001
+From: Milan Broz <gmazyland@gmail.com>
+Date: Mon, 11 Mar 2019 21:21:57 +0100
+Subject: [PATCH] Wait for already running threads if a thread creation failed.
+
+On memory-constrained systems (like cgroups limited processes)
+thread creation often fails.
+
+The code needs to wait for already running threads on error path;
+otherwise these threads can access deallocated memory
+(and cause a segfault or another crash).
+---
+ src/core.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/src/core.c b/src/core.c
+index 8361175..65f0537 100644
+--- src/core.c
++++ src/core.c
+@@ -310,7 +310,7 @@ static int fill_memory_blocks_mt(argon2_instance_t *instance) {
+ 
+     for (r = 0; r < instance->passes; ++r) {
+         for (s = 0; s < ARGON2_SYNC_POINTS; ++s) {
+-            uint32_t l;
++            uint32_t l, ll;
+ 
+             /* 2. Calling threads */
+             for (l = 0; l < instance->lanes; ++l) {
+@@ -335,6 +335,9 @@ static int fill_memory_blocks_mt(argon2_instance_t *instance) {
+                        sizeof(argon2_position_t));
+                 if (argon2_thread_create(&thread[l], &fill_segment_thr,
+                                          (void *)&thr_data[l])) {
++                    /* Wait for already running threads */
++                    for (ll = 0; ll < l; ++ll)
++                        argon2_thread_join(thread[ll]);
+                     rc = ARGON2_THREAD_FAIL;
+                     goto fail;
+                 }

srcpkgs/argon2/template

@@ -1,7 +1,7 @@
 # Template file for 'argon2'
 pkgname=argon2
 version=20171227
-revision=3
+revision=4
 wrksrc="phc-winner-argon2-${version}"
 build_style=gnu-makefile
 make_use_env=yes