From 6fb2cc17727ea59e59ae14ad3b8599977e480708 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Tue, 29 Jan 2013 08:55:09 +0000 Subject: * readelf.c (process_version_sections): Fix overflow checks to avoid undefined behaviour. --- binutils/readelf.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) (limited to 'binutils/readelf.c') diff --git a/binutils/readelf.c b/binutils/readelf.c index f880825cce..ae211a7d6f 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -1,7 +1,5 @@ /* readelf.c -- display contents of an ELF format file - Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, - 2008, 2009, 2010, 2011, 2012, 2013 - Free Software Foundation, Inc. + Copyright 1998-2013 Free Software Foundation, Inc. Originally developed by Eric Youngdale Modifications by Nick Clifton @@ -8469,8 +8467,8 @@ process_version_sections (FILE * file) int j; int isum; - /* Check for negative or very large indicies. */ - if ((unsigned char *) edefs + idx < (unsigned char *) edefs) + /* Check for very large indicies. */ + if (idx > (size_t) (endbuf - (char *) edefs)) break; vstart = ((char *) edefs) + idx; @@ -8494,8 +8492,7 @@ process_version_sections (FILE * file) ent.vd_ndx, ent.vd_cnt); /* Check for overflow. */ - if ((unsigned char *)(vstart + ent.vd_aux) < (unsigned char *) vstart - || (unsigned char *)(vstart + ent.vd_aux) > (unsigned char *) endbuf) + if (ent.vd_aux > (size_t) (endbuf - vstart)) break; vstart += ent.vd_aux; @@ -8515,8 +8512,7 @@ process_version_sections (FILE * file) for (j = 1; j < ent.vd_cnt; j++) { /* Check for overflow. */ - if ((unsigned char *)(vstart + aux.vda_next) < (unsigned char *) vstart - || (unsigned char *)(vstart + aux.vda_next) > (unsigned char *) endbuf) + if (aux.vda_next > (size_t) (endbuf - vstart)) break; isum += aux.vda_next; @@ -8586,7 +8582,7 @@ process_version_sections (FILE * file) int isum; char * vstart; - if ((unsigned char *) eneed + idx < (unsigned char *) eneed) + if (idx > (size_t) (endbuf - (char *) eneed)) break; vstart = ((char *) eneed) + idx; @@ -8611,8 +8607,7 @@ process_version_sections (FILE * file) printf (_(" Cnt: %d\n"), ent.vn_cnt); /* Check for overflow. */ - if ((unsigned char *)(vstart + ent.vn_aux) < (unsigned char *) vstart - || (unsigned char *)(vstart + ent.vn_aux) > (unsigned char *) endbuf) + if (ent.vn_aux > (size_t) (endbuf - vstart)) break; vstart += ent.vn_aux; @@ -8643,8 +8638,7 @@ process_version_sections (FILE * file) get_ver_flags (aux.vna_flags), aux.vna_other); /* Check for overflow. */ - if ((unsigned char *)(vstart + aux.vna_next) < (unsigned char *) vstart - || (unsigned char *)(vstart + aux.vna_next) > (unsigned char *) endbuf) + if (aux.vna_next > (size_t) (endbuf - vstart)) break; isum += aux.vna_next; -- cgit v1.2.1