From 7296a62a2a237f6b1ad8db8c38b090e9f592c8cf Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Thu, 13 Apr 2017 16:06:30 +0100 Subject: [PATCH] readelf: fix out of range subtraction, seg fault from a NULL pointer and memory exhaustion, all from parsing corrupt binaries. PR binutils/21379 * readelf.c (process_dynamic_section): Detect over large section offsets in the DT_SYMTAB entry. PR binutils/21345 * readelf.c (process_mips_specific): Catch an unfeasible memory allocation before it happens and print a suitable error message. Upstream-Status: Backport CVE: CVE-2017-9040 CVE: CVE-2017-9042 Signed-off-by: Armin Kuster --- binutils/ChangeLog | 12 ++++++++++++ binutils/readelf.c | 26 +++++++++++++++++++++----- 2 files changed, 33 insertions(+), 5 deletions(-) Index: git/binutils/readelf.c =================================================================== --- git.orig/binutils/readelf.c +++ git/binutils/readelf.c @@ -9306,6 +9306,12 @@ process_dynamic_section (FILE * file) processing that. This is overkill, I know, but it should work. */ section.sh_offset = offset_from_vma (file, entry->d_un.d_val, 0); + if ((bfd_size_type) section.sh_offset > current_file_size) + { + /* See PR 21379 for a reproducer. */ + error (_("Invalid DT_SYMTAB entry: %lx"), (long) section.sh_offset); + return FALSE; + } if (archive_file_offset != 0) section.sh_size = archive_file_size - section.sh_offset; @@ -15175,6 +15181,15 @@ process_mips_specific (FILE * file) return 0; } + /* PR 21345 - print a slightly more helpful error message + if we are sure that the cmalloc will fail. */ + if (conflictsno * sizeof (* iconf) > current_file_size) + { + error (_("Overlarge number of conflicts detected: %lx\n"), + (long) conflictsno); + return FALSE; + } + iconf = (Elf32_Conflict *) cmalloc (conflictsno, sizeof (* iconf)); if (iconf == NULL) {