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From 885444fcbe10dc42787ecb76686c8ee4dd33bf33 Mon Sep 17 00:00:00 2001
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From: Ken Sharp <ken.sharp@artifex.com>
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Date: Tue, 20 Aug 2019 10:10:28 +0100
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Subject: make .forceput inaccessible
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Bug #701343, #701344, #701345
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More defensive programming. We don't want people to access .forecput
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even though it is no longer sufficient to bypass SAFER. The exploit
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in #701343 didn't work anyway because of earlier work to stop the error
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handler being used, but nevertheless, prevent access to .forceput from
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.setuserparams2.
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diff --git a/Resource/Init/gs_lev2.ps b/Resource/Init/gs_lev2.ps
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index 4cc7f820f..0fd416465 100644
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--- a/Resource/Init/gs_lev2.ps
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+++ b/Resource/Init/gs_lev2.ps
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@@ -158,7 +158,7 @@ end
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{
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pop pop
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} ifelse
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- } forall
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+ } executeonly forall
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% A context switch might have occurred during the above loop,
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% causing the interpreter-level parameters to be reset.
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% Set them again to the new values. From here on, we are safe,
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@@ -229,9 +229,9 @@ end
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{ pop pop
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}
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ifelse
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- }
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+ } executeonly
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forall pop
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-} .bind odef
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+} .bind executeonly odef
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% Initialize the passwords.
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% NOTE: the names StartJobPassword and SystemParamsPassword are known to
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diff --git a/Resource/Init/gs_pdfwr.ps b/Resource/Init/gs_pdfwr.ps
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index c158a8faf..422e66e1a 100644
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--- a/Resource/Init/gs_pdfwr.ps
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+++ b/Resource/Init/gs_pdfwr.ps
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@@ -658,11 +658,11 @@ currentdict /.pdfmarkparams .undef
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systemdict /.pdf_hooked_DSC_Creator //true .forceput
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} executeonly if
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pop
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- } if
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+ } executeonly if
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} {
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pop
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} ifelse
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- }
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+ } executeonly
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{
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pop
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} ifelse
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