ntdll: Respect red zone in usr1_handler() on x64.

Fixes a regression introduced by efd3d310.

ntdll: Respect red zone in usr1_handler() on x64.
6f55a131 · Paul Gofman · Alexandre Julliard · c1b8db0c · 6f55a131
Commit 6f55a131 authored Mar 04, 2024 by Paul Gofman Committed by Alexandre Julliard Mar 05, 2024
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signal_x86_64.c dlls/ntdll/unix/signal_x86_64.c +1 -1

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--- a/dlls/ntdll/unix/signal_x86_64.c
+++ b/dlls/ntdll/unix/signal_x86_64.c
@@ -2152,7 +2152,7 @@ static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
        ULONG64 saved_compaction = 0;
        struct xcontext *context;

-        context = (struct xcontext *)(((ULONG_PTR)RSP_sig(ucontext) - sizeof(*context)) & ~15);
+        context = (struct xcontext *)(((ULONG_PTR)RSP_sig(ucontext) - 128 /* red zone */ - sizeof(*context)) & ~15);
        if ((char *)context < (char *)ntdll_get_thread_data()->kernel_stack)
        {
            ERR_(seh)( "kernel stack overflow.\n" );