Date: Tue, 12 Dec 2017 12:59:04 +0000 (UTC) From: Alexey Dokuchaev <danfe@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r326795 - in stable/8/contrib/gcclibs: include libiberty Message-ID: <201712121259.vBCCx4l3057189@repo.freebsd.org>
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Author: danfe (ports committer) Date: Tue Dec 12 12:59:04 2017 New Revision: 326795 URL: https://svnweb.freebsd.org/changeset/base/326795 Log: MFC r301291: libiberty: prevent integer overflow. Take care of very old bug leading to heap-buffer overflow by processing certain file headers via bfd binary. PR: 200888 Obtained from: OpenBSD Approved by: pfg Modified: stable/8/contrib/gcclibs/include/objalloc.h stable/8/contrib/gcclibs/libiberty/objalloc.c Directory Properties: stable/8/contrib/gcclibs/ (props changed) Modified: stable/8/contrib/gcclibs/include/objalloc.h ============================================================================== --- stable/8/contrib/gcclibs/include/objalloc.h Tue Dec 12 11:25:30 2017 (r326794) +++ stable/8/contrib/gcclibs/include/objalloc.h Tue Dec 12 12:59:04 2017 (r326795) @@ -1,5 +1,5 @@ /* objalloc.h -- routines to allocate memory for objects - Copyright 1997, 2001 Free Software Foundation, Inc. + Copyright 1997, 2001-2012 Free Software Foundation, Inc. Written by Ian Lance Taylor, Cygnus Solutions. This program is free software; you can redistribute it and/or modify it @@ -91,7 +91,7 @@ extern void *_objalloc_alloc (struct objalloc *, unsig if (__len == 0) \ __len = 1; \ __len = (__len + OBJALLOC_ALIGN - 1) &~ (OBJALLOC_ALIGN - 1); \ - (__len <= __o->current_space \ + (__len != 0 && __len <= __o->current_space \ ? (__o->current_ptr += __len, \ __o->current_space -= __len, \ (void *) (__o->current_ptr - __len)) \ Modified: stable/8/contrib/gcclibs/libiberty/objalloc.c ============================================================================== --- stable/8/contrib/gcclibs/libiberty/objalloc.c Tue Dec 12 11:25:30 2017 (r326794) +++ stable/8/contrib/gcclibs/libiberty/objalloc.c Tue Dec 12 12:59:04 2017 (r326795) @@ -1,5 +1,5 @@ /* objalloc.c -- routines to allocate memory for objects - Copyright 1997 Free Software Foundation, Inc. + Copyright 1997-2012 Free Software Foundation, Inc. Written by Ian Lance Taylor, Cygnus Solutions. This program is free software; you can redistribute it and/or modify it @@ -112,14 +112,21 @@ objalloc_create (void) /* Allocate space from an objalloc structure. */ PTR -_objalloc_alloc (struct objalloc *o, unsigned long len) +_objalloc_alloc (struct objalloc *o, unsigned long original_len) { + unsigned long len = original_len; + /* We avoid confusion from zero sized objects by always allocating at least 1 byte. */ if (len == 0) len = 1; len = (len + OBJALLOC_ALIGN - 1) &~ (OBJALLOC_ALIGN - 1); + + /* CVE-2012-3509: Check for overflow in the alignment operation above + * and then malloc argument below. */ + if (len + CHUNK_HEADER_SIZE < original_len) + return NULL; if (len <= o->current_space) {
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