Date: Wed, 29 Aug 2012 20:11:50 +0200 From: Florian Weimer <fw@...eb.enyo.de> To: oss-security@...ts.openwall.com Subject: CVE-2012-3509: objalloc_alloc integer overflows in libiberty Sang Kil Cha discovered that _objalloc_alloc does not guard the addition of CHUNK_HEADER_SIZE to the length against overflow. This can cause _objalloc_alloc to return a pointer to a memory region which is smaller than expected. The pointer alignment arithmetic in the objalloc_alloc macro misses an overflow check as well, with similar consequences. GCC bug: http://gcc.gnu.org/bugzilla/show_activity.cgi?id=54411 Patch under review: http://gcc.gnu.org/ml/gcc-patches/2012-08/msg01986.html (I believe GCC has the master copy of this file, but does not use it itself. libiberty is part of binutils and GDB, too.)
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