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ntdll: Error out if unwinding isn't progressing on arm. 

In PE builds of wine, there's no unwind info (as LLVM hasn't
implemented generating SEH unwind info for ARM yet).

On startup of wine, an exception of the type RPC_S_SERVER_UNAVAILABLE
is raised. In a PE build of Wine, the unwind would get stuck in
an infinite loop.

This still loops for a short while; after returning the error
STATUS_INVALID_DISPOSITION, KiUserExceptionDispatcher ends up
calling RtlRaiseStatus with this status, which then tries to
unwind again, getting stuck similarly. However by recursively
trying to unwind multiple times, the process crashes fairly soon
after running out of stack.

Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Martin Storsjö 2021-11-15 16:02:08 +02:00 committed by Alexandre Julliard
parent 4e351b47bf
commit d00c897749
1 changed files with 6 additions and 3 deletions
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9
dlls/ntdll/unix/signal_arm.c
View File

@ -255,13 +255,16 @@ NTSTATUS CDECL unwind_builtin_dll( ULONG type, struct _DISPATCHER_CONTEXT *dispa
}
if (rc == -UNW_ENOINFO || ip < info.start_ip || ip > info.end_ip)
{
TRACE( "no info found for %x ip %x-%x, assuming leaf function\n",
ip, info.start_ip, info.end_ip );
NTSTATUS status = context->Pc != context->Lr ?
STATUS_SUCCESS : STATUS_INVALID_DISPOSITION;
TRACE( "no info found for %x ip %x-%x, %s\n",
ip, info.start_ip, info.end_ip, status == STATUS_SUCCESS ?
"assuming leaf function" : "error, stuck" );
dispatch->LanguageHandler = NULL;
dispatch->EstablisherFrame = context->Sp;
context->Pc = context->Lr;
context->ContextFlags |= CONTEXT_UNWOUND_TO_CALL;
return STATUS_SUCCESS;
return status;
}
TRACE( "ip %#x function %#lx-%#lx personality %#lx lsda %#lx fde %#lx\n",