bug#18477: Bug#758971: byte-compiled files have wrong permissions

[Andy Wingo <wingo@pobox.com>]

Fixed in 2.0 and the 2.2 prerelease.  Thanks!

Andy

On Sun 14 Sep 2014 23:33, Rob Browning <rlb@defaultvalue.org> writes:

> [If possible, please preserve the -forwarded address in any replies.]
>
> I suspect this should be fixed, if it hasn't been already.
>
>   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758971
>
> Thanks
>
> Rand Peters <rwpeters@yandex.com> writes:
>
>> Package: guile-2.0
>> Version: 2.0.11+1-1
>> Tags: security
>>
>> Guile automatically byte-compiles programs when they are run, and
>> places the byte-compiled file in a subdirectory of
>> $HOME/.cache/guile/.
>>
>> However, the permissions of the byte-compiled file are derived from
>> umask rather than the permissions of the source file. This means that
>> sensitive data (e.g. a hard-coded password) contained in a source file
>> with restrictive permissions will be copied into a byte-compiled file
>> that may be world-readable.
>>
>> Guile should ensure that the permissions of byte-compiled files match
>> those of the source.
>>
>> Example:
>>
>> $ touch myscript
>>
>> $ chmod 700 myscript             # source file readable only to owner
>>
>> $ cat >> myscript <<'EOF'
>> #!/usr/bin/guile \
>> -e main -s
>> !#
>>
>> (define secret-password "DEADBEEFDEADBEEF")
>>
>> (define (main args)
>>   (display "this program contains an embedded secret")
>>   (newline))
>> EOF
>>
>> $ ./myscript
>> ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
>> ;;;       or pass the --no-auto-compile argument to disable.
>> ;;; compiling /home/rwp/./myscript
>> ;;; compiled /home/rwp/.cache/guile/ccache/2.0-LE-4-2.0/home/rwp/myscript.go
>> this program contains an embedded secret
>>
>> $ ls -l ~rwp/.cache/guile/ccache/2.0-LE-4-2.0/home/rwp/myscript.go
>> -rw-r--r-- 1 rwp rwp 456 Jul 1 12:00 /home/[...]/myscript.go
>>
>> # ^^ Note that the byte-compiled file is world-readable
>>
>> $ strings ~rwp/.cache/guile/ccache/2.0-LE-4-2.0/home/rwp/myscript.go
>> [...]
>> DEADBEEFDEADBEEF
>> secret-password
>> [...]