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bug#12095: Protecting pointer on bytevector with guardian does not prote
From: |
Patrick Bernaud |
Subject: |
bug#12095: Protecting pointer on bytevector with guardian does not protect memory |
Date: |
Mon, 30 Jul 2012 18:01:09 +0200 |
The memory from a bytevector of which a pointer is taken (with
'bytevector->pointer') can be overwritten even if that pointer has
been put inside a guardian. 'make-c-struct' from (system foreign) is
using 'bytevector->pointer'.
With the test script attached:
$ guile -v | head -1
guile (GNU Guile) 2.0.6.8-cc26b9-dirty
$ guile --no-auto-compile -s test.scm
#<pointer 0x974648c>
#vu8(1 1 1 1 1 1 1 1 1 1)
#vu8(1 1 1 1 1 1 1 1 1 1)
#vu8(110 103 45 108 101 110 103 116 104 0) <<<< memory overwrite with
"ng-length\0" from module
#<pointer 0x974648c>
$
With auto compilation turned on, it looks like the problem can not be
reproduced.
--
Patrick Bernaud
test.scm
Description: Binary data
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