From 3565cf8fedf2bae2b383fae66dde62c3bdae51c9 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Thu, 8 Jan 2015 12:37:46 +0000 Subject: [PATCH] Fixes for memory access violations triggered by running nlmconv on fuzzed binaries. PR binutils/17512 * nlmconv.c (i386_mangle_relocs): Skip relocs without an associated symbol. (powerpc_mangle_relocs): Skip unrecognised relocs. Check address range before applying a reloc. --- binutils/ChangeLog | 8 ++++++++ binutils/nlmconv.c | 30 ++++++++++++++++++++++++++++-- 2 files changed, 36 insertions(+), 2 deletions(-) diff --git a/binutils/ChangeLog b/binutils/ChangeLog index 17d2dd670db..cfad0f76427 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,11 @@ +2015-01-08 Nick Clifton + + PR binutils/17512 + * nlmconv.c (i386_mangle_relocs): Skip relocs without an + associated symbol. + (powerpc_mangle_relocs): Skip unrecognised relocs. Check address + range before applying a reloc. + 2015-01-07 Nick Clifton PR binutils/17512 diff --git a/binutils/nlmconv.c b/binutils/nlmconv.c index d0db1b30452..8c4975df979 100644 --- a/binutils/nlmconv.c +++ b/binutils/nlmconv.c @@ -1415,6 +1415,9 @@ i386_mangle_relocs (bfd *outbfd, asection *insec, arelent ***relocs_ptr, bfd_vma addend; rel = *relocs++; + /* PR 17512: file: 057f89c1. */ + if (rel->sym_ptr_ptr == NULL) + continue; sym = *rel->sym_ptr_ptr; /* We're moving the relocs from the input section to the output @@ -1871,7 +1874,7 @@ powerpc_mangle_relocs (bfd *outbfd, asection *insec, toc_howto = bfd_reloc_type_lookup (insec->owner, BFD_RELOC_PPC_TOC16); if (toc_howto == (reloc_howto_type *) NULL) - abort (); + fatal (_("Unable to locate PPC_TOC16 reloc information")); /* If this is the .got section, clear out all the contents beyond the initial size. We must do this here because copy_sections is @@ -1910,6 +1913,10 @@ powerpc_mangle_relocs (bfd *outbfd, asection *insec, } } + /* PR 17512: file: 70cfde95. */ + if (rel->howto == NULL) + continue; + /* We must be able to resolve all PC relative relocs at this point. If we get a branch to an undefined symbol we build a stub, since NetWare will resolve undefined symbols into a @@ -1927,6 +1934,12 @@ powerpc_mangle_relocs (bfd *outbfd, asection *insec, { bfd_vma val; + if (rel->address > contents_size - 4) + { + non_fatal (_("Out of range relocation: %lx"), rel->address); + break; + } + assert (rel->howto->size == 2 && rel->howto->pcrel_offset); val = bfd_get_32 (outbfd, (bfd_byte *) contents + rel->address); val = ((val &~ rel->howto->dst_mask) @@ -1976,6 +1989,12 @@ powerpc_mangle_relocs (bfd *outbfd, asection *insec, switch (rel->howto->size) { case 1: + if (rel->address > contents_size - 2) + { + non_fatal (_("Out of range relocation: %lx"), rel->address); + break; + } + val = bfd_get_16 (outbfd, (bfd_byte *) contents + rel->address); val = ((val &~ rel->howto->dst_mask) @@ -1991,6 +2010,13 @@ powerpc_mangle_relocs (bfd *outbfd, asection *insec, break; case 2: + /* PR 17512: file: 0455a112. */ + if (rel->address > contents_size - 4) + { + non_fatal (_("Out of range relocation: %lx"), rel->address); + break; + } + val = bfd_get_32 (outbfd, (bfd_byte *) contents + rel->address); val = ((val &~ rel->howto->dst_mask) @@ -2002,7 +2028,7 @@ powerpc_mangle_relocs (bfd *outbfd, asection *insec, break; default: - abort (); + fatal (_("Unsupported relocation size: %d"), rel->howto->size); } if (! bfd_is_und_section (bfd_get_section (sym))) -- 2.30.2