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Please get this merged into the GCC mainline.  Hopefully you have an 
FSF copyright assignment on-file.

Begin forwarded message:

> From: Jim Wise <jwise@netbsd.org>
> Date: November 29, 2004 5:51:13 PM PST
> To: source-changes@NetBSD.org
> Subject: CVS commit: src/gnu/dist/gcc/gcc
> Reply-To: jwise@netbsd.org
>
>
> Module Name:	src
> Committed By:	jwise
> Date:		Tue Nov 30 01:51:13 UTC 2004
>
> Modified Files:
> 	src/gnu/dist/gcc/gcc: cppfiles.c
> 	src/gnu/dist/gcc/gcc/doc: cpp.1 cpp.info cppenv.texi
>
> Log Message:
> As discussed on tech-toolchain@netbsd.org, make cpp refuse to attempt 
> to
> parse a #include'd file which does not pass S_ISREG() if the 
> environment variable
> CPP_RESTRICTED is set.
>
> This is primarily intended for use by programs such as calendar(1) 
> which
> use cpp to parse untrusted user files -- without this change (and the 
> corresponding
> change to calendar(1)), any user can cause a denial-of-service for the 
> daily
> calendar -a run by #include'ing a named pipe.
>
> Many thanks to christos@netbsd for his help in polishing this.
>
>
> To generate a diff of this commit:
> cvs rdiff -r1.1.1.1 -r1.2 src/gnu/dist/gcc/gcc/cppfiles.c
> cvs rdiff -r1.4 -r1.5 src/gnu/dist/gcc/gcc/doc/cpp.1
> cvs rdiff -r1.1.1.2 -r1.2 src/gnu/dist/gcc/gcc/doc/cpp.info
> cvs rdiff -r1.1.1.1 -r1.2 src/gnu/dist/gcc/gcc/doc/cppenv.texi
>
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.
>
         -- Jason R. Thorpe <thorpej@shagadelic.org>


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