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65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
From be53833558c250e83e7a92f466c5d845bea4f0f1 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 3b85f1efa..411d2bf5b 100644
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--- a/dlls/ntdll/exception.c
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+++ b/dlls/ntdll/exception.c
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@@ -671,8 +671,13 @@ PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry( ULONG_PTR pc, ULONG_PTR *base,
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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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/*************************************************************
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diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
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index 746d77c75..6200721ca 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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@@ -727,6 +727,7 @@ static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
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return STATUS_UNHANDLED_EXCEPTION;
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}
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+NTSTATUS WINAPI __syscall_NtContinue( CONTEXT *context, BOOLEAN alert );
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/*******************************************************************
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* raise_exception
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@@ -791,7 +792,7 @@ static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL f
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NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
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}
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done:
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- return NtSetContextThread( GetCurrentThread(), context );
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+ return __syscall_NtContinue( context, FALSE );
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}
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--
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2.23.0
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