Source: fontconfig
Version: 2.11.0-6.7
Severity: wishlist
Tags: patch
User: [email protected]
Usertags: randomness
X-Debbugs-Cc: [email protected]
Hi,
Whilst working on the Reproducible Builds [0] we noticed that the fc-cache
command generates cache files in with non-deterministic contents.
This is problematic for us as bootstrapping a new Debian system will result
in different contents under /var/cache/fontconfig and thus the generated
system is not reproducible. In Tails[1] we are working around this by simply
deleting the contents of this directory [2] but this probably isn't a good
idea.
The cause is due to fc-cache writing unitialised memory during scanning of
the directory index.
Patch attached.
[0] https://reproducible-builds.org/
[1] https://tails.boum.org/
[2]
https://git-tails.immerda.ch/tails/tree/config/chroot_local-hooks/99-zzzzzz_reproducible-builds-post-processing?h=feature/5630-deterministic-builds#n28
Regards,
--
,''`.
: :' : Chris Lamb
`. `'` [email protected] / chris-lamb.co.uk
`-
diff --git a/src/fcpat.c b/src/fcpat.c
index 0614ac2..374432a 100644
--- a/src/fcpat.c
+++ b/src/fcpat.c
@@ -33,6 +33,7 @@ FcPatternCreate (void)
p = (FcPattern *) malloc (sizeof (FcPattern));
if (!p)
return 0;
+ memset (p, 0, sizeof (FcPattern));
p->num = 0;
p->size = 0;
p->elts_offset = FcPtrToOffset (p, NULL);
