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52 lines
2.3 KiB
Diff
52 lines
2.3 KiB
Diff
From 5a4827d5c16aefd82029583710b9032a2356917b Mon Sep 17 00:00:00 2001
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From: Sebastian Lackner <sebastian@fds-team.de>
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Date: Sat, 22 Nov 2014 05:49:30 +0100
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Subject: ntdll: Fix issues with write watches when using Exagear.
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---
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dlls/ntdll/virtual.c | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/dlls/ntdll/virtual.c b/dlls/ntdll/virtual.c
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index f7aae0b..3fa2027 100644
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--- a/dlls/ntdll/virtual.c
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+++ b/dlls/ntdll/virtual.c
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@@ -1558,6 +1558,26 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
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{
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void *page = ROUND_ADDR( addr, page_mask );
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BYTE *vprot = &view->prot[((const char *)page - (const char *)view->base) >> page_shift];
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+#ifdef EXAGEAR_COMPAT
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+ /* Exagear doesn't correctly set err, so always check for write watches, and
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+ * retry after removing the VPROT_WRITEWATCH or VPROT_WRITECOPY flag. In
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+ * contrary to the general implementation below this is not completely race-
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+ * condition safe. When multiple threads trigger the write watch at the same
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+ * time only the first thread will properly continue the execution, the rest
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+ * will crash. */
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+ if ((view->protect & VPROT_WRITEWATCH) && (*vprot & VPROT_WRITEWATCH))
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+ {
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+ *vprot &= ~VPROT_WRITEWATCH;
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+ VIRTUAL_SetProt( view, page, page_size, *vprot );
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+ if (VIRTUAL_GetUnixProt( *vprot ) & PROT_WRITE) ret = STATUS_SUCCESS;
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+ }
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+ if (*vprot & VPROT_WRITECOPY)
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+ {
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+ *vprot = (*vprot & ~VPROT_WRITECOPY) | VPROT_WRITE;
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+ VIRTUAL_SetProt( view, page, page_size, *vprot );
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+ if (VIRTUAL_GetUnixProt( *vprot ) & PROT_WRITE) ret = STATUS_SUCCESS;
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+ }
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+#else
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if (err & EXCEPTION_WRITE_FAULT)
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{
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if ((view->protect & VPROT_WRITEWATCH) && (*vprot & VPROT_WRITEWATCH))
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@@ -1573,6 +1593,7 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
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/* ignore fault if page is writable now */
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if (VIRTUAL_GetUnixProt( *vprot ) & PROT_WRITE) ret = STATUS_SUCCESS;
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}
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+#endif
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if (!on_signal_stack && (*vprot & VPROT_GUARD))
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{
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VIRTUAL_SetProt( view, page, page_size, *vprot & ~VPROT_GUARD );
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--
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2.2.2
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