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From f198066024d3371be78819b18e737caf63a26aa0 Mon Sep 17 00:00:00 2001
From: Nirbheek Chauhan <nirbheek@centricular.com>
Date: Wed, 8 Jul 2020 23:10:34 +0530
Subject: [PATCH 1/2] crypto/win: Don't use disallowed APIs on UWP
CreateFiber and ConvertThreadToFiber are not allowed in Windows Store
(Universal Windows Platform) apps since they have been replaced by
their Ex variants which have a new dwFlags parameter.
This flag allows the fiber to do floating-point arithmetic in the
fiber on x86, which would silently cause corruption otherwise since
the floating-point state is not switched by default.
Switch to these "new" APIs which were added in Vista.
See: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createfiberex#parameters
---
crypto/async/arch/async_win.c | 2 +-
crypto/async/arch/async_win.h | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/crypto/async/arch/async_win.c b/crypto/async/arch/async_win.c
index 1f360d8..30aa018 100644
--- a/crypto/async/arch/async_win.c
+++ b/crypto/async/arch/async_win.c
@@ -34,7 +34,7 @@ void async_local_cleanup(void)
int async_fibre_init_dispatcher(async_fibre *fibre)
{
- fibre->fibre = ConvertThreadToFiber(NULL);
+ fibre->fibre = ConvertThreadToFiberEx(NULL, FIBER_FLAG_FLOAT_SWITCH);
if (fibre->fibre == NULL) {
fibre->converted = 0;
fibre->fibre = GetCurrentFiber();
diff --git a/crypto/async/arch/async_win.h b/crypto/async/arch/async_win.h
index 61cfdd7..9f09caa 100644
--- a/crypto/async/arch/async_win.h
+++ b/crypto/async/arch/async_win.h
@@ -27,7 +27,8 @@ typedef struct async_fibre_st {
# define async_fibre_swapcontext(o,n,r) \
(SwitchToFiber((n)->fibre), 1)
# define async_fibre_makecontext(c) \
- ((c)->fibre = CreateFiber(0, async_start_func_win, 0))
+ ((c)->fibre = CreateFiberEx(0, 0, FIBER_FLAG_FLOAT_SWITCH, \
+ async_start_func_win, 0))
# define async_fibre_free(f) (DeleteFiber((f)->fibre))
int async_fibre_init_dispatcher(async_fibre *fibre);
--
2.26.2
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