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https://gitlab.winehq.org/wine/wine-staging.git
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55 lines
2.0 KiB
Diff
55 lines
2.0 KiB
Diff
From 3d29cd7c6feabae6c5ae5941f49c663b1fb78ab8 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Michael=20M=C3=BCller?= <michael@fds-team.de>
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Date: Sat, 4 Oct 2014 03:22:09 +0200
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Subject: ntdll: Only enable true WRITECOPY protection when a special
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environment variable is set.
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---
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dlls/ntdll/virtual.c | 23 ++++++++++++++++++++++-
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1 file changed, 22 insertions(+), 1 deletion(-)
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diff --git a/dlls/ntdll/virtual.c b/dlls/ntdll/virtual.c
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index 36d8836..0c7ae29 100644
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--- a/dlls/ntdll/virtual.c
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+++ b/dlls/ntdll/virtual.c
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@@ -166,6 +166,21 @@ static const char *VIRTUAL_GetProtStr( BYTE prot )
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return buffer;
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}
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+/* This might look like a hack, but it actually isn't - the 'experimental' version
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+ * is correct, but it already has revealed a couple of additional Wine bugs, which
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+ * were not triggered before, and there are probably some more.
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+ * To avoid breaking Wine for everyone, the new correct implementation has to be
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+ * manually enabled, until it is tested a bit more. */
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+static inline BOOL experimental_WRITECOPY( void )
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+{
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+ static int enabled = -1;
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+ if (enabled == -1)
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+ {
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+ const char *str = getenv("STAGING_WRITECOPY");
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+ enabled = str && (atoi(str) != 0);
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+ }
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+ return enabled;
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+}
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/***********************************************************************
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* VIRTUAL_GetUnixProt
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@@ -181,7 +196,13 @@ static int VIRTUAL_GetUnixProt( BYTE vprot )
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if (vprot & VPROT_WRITE) prot |= PROT_WRITE | PROT_READ;
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if (vprot & VPROT_EXEC) prot |= PROT_EXEC | PROT_READ;
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#if defined(__i386__)
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- if (vprot & VPROT_WRITECOPY) prot = (prot & ~PROT_WRITE) | PROT_READ;
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+ if (vprot & VPROT_WRITECOPY)
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+ {
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+ if (experimental_WRITECOPY())
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+ prot = (prot & ~PROT_WRITE) | PROT_READ;
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+ else
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+ prot |= PROT_WRITE | PROT_READ;
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+ }
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#else
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/* FIXME: Architecture needs implementation of signal_init_early. */
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if (vprot & VPROT_WRITECOPY) prot |= PROT_WRITE | PROT_READ;
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--
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2.2.1
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