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Added patch to implement basic handling of write watches while we're on the signal stack.

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This commit is contained in:
Sebastian Lackner
2015-02-11 13:37:53 +01:00
parent d8772033dd
commit 3f60978f12
6 changed files with 166 additions and 9 deletions
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12
patches/Exagear/0002-ntdll-Fix-issues-with-write-watches-when-using-Exage.patch
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@@ -1,4 +1,4 @@
From 8c7754a1da9f43cf15057a8467c0b76c9da2ce40 Mon Sep 17 00:00:00 2001
From 5a4827d5c16aefd82029583710b9032a2356917b Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian@fds-team.de>
Date: Sat, 22 Nov 2014 05:49:30 +0100
Subject: ntdll: Fix issues with write watches when using Exagear.
@@ -8,10 +8,10 @@ Subject: ntdll: Fix issues with write watches when using Exagear.
1 file changed, 21 insertions(+)
diff --git a/dlls/ntdll/virtual.c b/dlls/ntdll/virtual.c
index 1a8e4a4..4140323 100644
index f7aae0b..3fa2027 100644
--- a/dlls/ntdll/virtual.c
+++ b/dlls/ntdll/virtual.c
@@ -1558,6 +1558,26 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err )
@@ -1558,6 +1558,26 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
{
void *page = ROUND_ADDR( addr, page_mask );
BYTE *vprot = &view->prot[((const char *)page - (const char *)view->base) >> page_shift];
@@ -38,14 +38,14 @@ index 1a8e4a4..4140323 100644
if (err & EXCEPTION_WRITE_FAULT)
{
if ((view->protect & VPROT_WRITEWATCH) && (*vprot & VPROT_WRITEWATCH))
@@ -1573,6 +1593,7 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err )
@@ -1573,6 +1593,7 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
/* ignore fault if page is writable now */
if (VIRTUAL_GetUnixProt( *vprot ) & PROT_WRITE) ret = STATUS_SUCCESS;
}
+#endif
if (*vprot & VPROT_GUARD)
if (!on_signal_stack && (*vprot & VPROT_GUARD))
{
VIRTUAL_SetProt( view, page, page_size, *vprot & ~VPROT_GUARD );
--
2.1.3
2.2.2