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65 lines
2.4 KiB
Diff
65 lines
2.4 KiB
Diff
From a5df41839d388e3bb0f8aefde70edcc8476429b2 Mon Sep 17 00:00:00 2001
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From: Andrew Wesie <awesie@gmail.com>
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Date: Fri, 27 Jul 2018 01:26:56 -0500
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Subject: [PATCH] Use NtContinue to continue execution after exceptions.
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NtContinue is exported by ntdll and some programs expect it to be used to
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restore the thread context after an exception handler returns
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EXCEPTION_CONTINUE_EXECUTION. It must take a context as its first argument
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and restore that context.
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Current implementation is a simple wrapper around NtSetContextThread. It is
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unlikely that it has the correct behavior if called by an external caller.
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The __syscall_NtContinue wrapper is used so that it can be hooked by a
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third-party.
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---
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dlls/ntdll/exception.c | 9 +++++++--
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dlls/ntdll/signal_i386.c | 3 ++-
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2 files changed, 9 insertions(+), 3 deletions(-)
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diff --git a/dlls/ntdll/exception.c b/dlls/ntdll/exception.c
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index 664b620..236f600 100644
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--- a/dlls/ntdll/exception.c
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+++ b/dlls/ntdll/exception.c
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@@ -311,8 +311,13 @@ ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
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*/
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NTSTATUS WINAPI NtContinue( CONTEXT *context, BOOLEAN alert )
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{
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- FIXME( "(%p, %d) stub!\n", context, alert );
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- return STATUS_NOT_IMPLEMENTED;
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+ TRACE( "(%p, %d) stub!\n", context, alert );
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+
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+ /* NtSetContextThread will not have the intended behavior for a partial context. */
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+ if ((context->ContextFlags & CONTEXT_FULL) != CONTEXT_FULL)
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+ return STATUS_NOT_IMPLEMENTED;
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+
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+ return NtSetContextThread( GetCurrentThread(), context );
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}
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diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
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index f0de17a..d1ae9b8 100644
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--- a/dlls/ntdll/signal_i386.c
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+++ b/dlls/ntdll/signal_i386.c
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@@ -2605,6 +2605,7 @@ __ASM_STDCALL_FUNC( RtlUnwind, 16,
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__ASM_CFI(".cfi_same_value %ebp\n\t")
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"ret $16" ) /* actually never returns */
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+NTSTATUS WINAPI __syscall_NtContinue( CONTEXT *context, BOOLEAN alert );
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/*******************************************************************
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* NtRaiseException (NTDLL.@)
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@@ -2612,7 +2613,7 @@ __ASM_STDCALL_FUNC( RtlUnwind, 16,
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NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
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{
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NTSTATUS status = raise_exception( rec, context, first_chance );
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- if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
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+ if (status == STATUS_SUCCESS) __syscall_NtContinue(context, FALSE);
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return status;
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}
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--
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1.9.1
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