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elfutils/elfutils-robustify.patch

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From: Tony Jones <tonyj@suse.de>
Subject: Elfutils robustify patch
Version: 0.152
References: https://fedorahosted.org/releases/e/l/elfutils/0.152/elfutils-robustify.patch
Upstream: yes
This patch contains functional/stability fixes that are regarded as generally
useful by the community but are not accepted by the elfutils maintainer (and
are therefore not in the git repository).
--- elfutils/libelf/ChangeLog
+++ elfutils/libelf/ChangeLog
@@ -663,10 +663,53 @@
If section content hasn't been read yet, do it before looking for the
block size. If no section data present, infer size of section header.
+2005-05-14 Jakub Jelinek <jakub@redhat.com>
+
+ * libelfP.h (INVALID_NDX): Define.
+ * gelf_getdyn.c (gelf_getdyn): Use it. Remove ndx < 0 test if any.
+ * gelf_getlib.c (gelf_getlib): Likewise.
+ * gelf_getmove.c (gelf_getmove): Likewise.
+ * gelf_getrel.c (gelf_getrel): Likewise.
+ * gelf_getrela.c (gelf_getrela): Likewise.
+ * gelf_getsym.c (gelf_getsym): Likewise.
+ * gelf_getsyminfo.c (gelf_getsyminfo): Likewise.
+ * gelf_getsymshndx.c (gelf_getsymshndx): Likewise.
+ * gelf_getversym.c (gelf_getversym): Likewise.
+ * gelf_update_dyn.c (gelf_update_dyn): Likewise.
+ * gelf_update_lib.c (gelf_update_lib): Likewise.
+ * gelf_update_move.c (gelf_update_move): Likewise.
+ * gelf_update_rel.c (gelf_update_rel): Likewise.
+ * gelf_update_rela.c (gelf_update_rela): Likewise.
+ * gelf_update_sym.c (gelf_update_sym): Likewise.
+ * gelf_update_syminfo.c (gelf_update_syminfo): Likewise.
+ * gelf_update_symshndx.c (gelf_update_symshndx): Likewise.
+ * gelf_update_versym.c (gelf_update_versym): Likewise.
+ * elf_newscn.c (elf_newscn): Check for overflow.
+ * elf32_updatefile.c (__elfw2(LIBELFBITS,updatemmap)): Likewise.
+ (__elfw2(LIBELFBITS,updatefile)): Likewise.
+ * elf_begin.c (file_read_elf): Likewise.
+ * elf32_newphdr.c (elfw2(LIBELFBITS,newphdr)): Likewise.
+ * elf_getarsym.c (elf_getarsym): Likewise.
+ * elf32_getshdr.c (elfw2(LIBELFBITS,getshdr)): Likewise.
2005-05-11 Ulrich Drepper <drepper@redhat.com>
* elf.h: Update again.
+2005-05-17 Jakub Jelinek <jakub@redhat.com>
+
+ * elf32_getphdr.c (elfw2(LIBELFBITS,getphdr)): Check if program header
+ table fits into object's bounds.
+ * elf_getshstrndx.c (elf_getshstrndx): Add elf->start_offset to
+ elf->map_address. Check if first section header fits into object's
+ bounds.
+ * elf32_getshdr.c (elfw2(LIBELFBITS,getshdr)):
+ Check if section header table fits into object's bounds.
+ * elf_begin.c (get_shnum): Ensure section headers fits into
+ object's bounds.
+ (file_read_elf): Make sure scncnt is small enough to allocate both
+ ElfXX_Shdr and Elf_Scn array. Make sure section and program header
+ tables fit into object's bounds. Avoid memory leak on failure.
+
2005-05-09 Ulrich Drepper <drepper@redhat.com>
* elf.h: Update from glibc.
--- elfutils/libelf/elf32_getphdr.c
+++ elfutils/libelf/elf32_getphdr.c
@@ -114,6 +114,16 @@ __elfw2(LIBELFBITS,getphdr_wrlock) (elf)
if (elf->map_address != NULL)
{
+ /* First see whether the information in the ELF header is
+ valid and it does not ask for too much. */
+ if (unlikely (ehdr->e_phoff >= elf->maximum_size)
+ || unlikely (elf->maximum_size - ehdr->e_phoff < size))
+ {
+ /* Something is wrong. */
+ __libelf_seterrno (ELF_E_INVALID_PHDR);
+ goto out;
+ }
+
/* All the data is already mapped. Use it. */
void *file_phdr = ((char *) elf->map_address
+ elf->start_offset + ehdr->e_phoff);
--- elfutils/libelf/elf32_getshdr.c
+++ elfutils/libelf/elf32_getshdr.c
@@ -1,5 +1,5 @@
/* Return section header.
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2007, 2009 Red Hat, Inc.
+ Copyright (C) 1998-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 1998.
@@ -81,7 +81,8 @@ load_shdr_wrlock (Elf_Scn *scn)
goto out;
size_t shnum;
- if (__elf_getshdrnum_rdlock (elf, &shnum) != 0)
+ if (__elf_getshdrnum_rdlock (elf, &shnum) != 0
+ || shnum > SIZE_MAX / sizeof (ElfW2(LIBELFBITS,Shdr)))
goto out;
size_t size = shnum * sizeof (ElfW2(LIBELFBITS,Shdr));
@@ -98,6 +99,16 @@ load_shdr_wrlock (Elf_Scn *scn)
if (elf->map_address != NULL)
{
+ /* First see whether the information in the ELF header is
+ valid and it does not ask for too much. */
+ if (unlikely (ehdr->e_shoff >= elf->maximum_size)
+ || unlikely (elf->maximum_size - ehdr->e_shoff < size))
+ {
+ /* Something is wrong. */
+ __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
+ goto free_and_out;
+ }
+
ElfW2(LIBELFBITS,Shdr) *notcvt;
/* All the data is already mapped. If we could use it
--- elfutils/libelf/elf32_newphdr.c
+++ elfutils/libelf/elf32_newphdr.c
@@ -135,6 +135,12 @@ elfw2(LIBELFBITS,newphdr) (elf, count)
|| count == PN_XNUM
|| elf->state.ELFW(elf,LIBELFBITS).phdr == NULL)
{
+ if (unlikely (count > SIZE_MAX / sizeof (ElfW2(LIBELFBITS,Phdr))))
+ {
+ result = NULL;
+ goto out;
+ }
+
/* Allocate a new program header with the appropriate number of
elements. */
result = (ElfW2(LIBELFBITS,Phdr) *)
--- elfutils/libelf/elf32_updatefile.c
+++ elfutils/libelf/elf32_updatefile.c
@@ -223,6 +223,9 @@ __elfw2(LIBELFBITS,updatemmap) (Elf *elf
/* Write all the sections. Well, only those which are modified. */
if (shnum > 0)
{
+ if (unlikely (shnum > SIZE_MAX / sizeof (Elf_Scn *)))
+ return 1;
+
Elf_ScnList *list = &elf->state.ELFW(elf,LIBELFBITS).scns;
Elf_Scn **scns = (Elf_Scn **) alloca (shnum * sizeof (Elf_Scn *));
char *const shdr_start = ((char *) elf->map_address + elf->start_offset
@@ -645,6 +648,10 @@ __elfw2(LIBELFBITS,updatefile) (Elf *elf
/* Write all the sections. Well, only those which are modified. */
if (shnum > 0)
{
+ if (unlikely (shnum > SIZE_MAX / (sizeof (Elf_Scn *)
+ + sizeof (ElfW2(LIBELFBITS,Shdr)))))
+ return 1;
+
off_t shdr_offset = elf->start_offset + ehdr->e_shoff;
#if EV_NUM != 2
xfct_t shdr_fctp = __elf_xfctstom[__libelf_version - 1][EV_CURRENT - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][ELF_T_SHDR];
--- elfutils/libelf/elf_begin.c
+++ elfutils/libelf/elf_begin.c
@@ -165,7 +165,8 @@ get_shnum (void *map_address, unsigned c
if (unlikely (result == 0) && ehdr.e32->e_shoff != 0)
{
- if (ehdr.e32->e_shoff + sizeof (Elf32_Shdr) > maxsize)
+ if (unlikely (ehdr.e32->e_shoff >= maxsize)
+ || unlikely (maxsize - ehdr.e32->e_shoff < sizeof (Elf32_Shdr)))
/* Cannot read the first section header. */
return 0;
@@ -213,7 +214,8 @@ get_shnum (void *map_address, unsigned c
if (unlikely (result == 0) && ehdr.e64->e_shoff != 0)
{
- if (ehdr.e64->e_shoff + sizeof (Elf64_Shdr) > maxsize)
+ if (unlikely (ehdr.e64->e_shoff >= maxsize)
+ || unlikely (ehdr.e64->e_shoff + sizeof (Elf64_Shdr) > maxsize))
/* Cannot read the first section header. */
return 0;
@@ -285,6 +287,15 @@ file_read_elf (int fildes, void *map_add
/* Could not determine the number of sections. */
return NULL;
+ /* Check for too many sections. */
+ if (e_ident[EI_CLASS] == ELFCLASS32)
+ {
+ if (scncnt > SIZE_MAX / (sizeof (Elf_Scn) + sizeof (Elf32_Shdr)))
+ return NULL;
+ }
+ else if (scncnt > SIZE_MAX / (sizeof (Elf_Scn) + sizeof (Elf64_Shdr)))
+ return NULL;
+
/* We can now allocate the memory. Even if there are no section headers,
we allocate space for a zeroth section in case we need it later. */
const size_t scnmax = (scncnt ?: (cmd == ELF_C_RDWR || cmd == ELF_C_RDWR_MMAP)
@@ -324,6 +335,16 @@ file_read_elf (int fildes, void *map_add
{
/* We can use the mmapped memory. */
elf->state.elf32.ehdr = ehdr;
+
+ if (unlikely (ehdr->e_shoff >= maxsize)
+ || unlikely (maxsize - ehdr->e_shoff
+ < scncnt * sizeof (Elf32_Shdr)))
+ {
+ free_and_out:
+ free (elf);
+ __libelf_seterrno (ELF_E_INVALID_FILE);
+ return NULL;
+ }
elf->state.elf32.shdr
= (Elf32_Shdr *) ((char *) ehdr + ehdr->e_shoff);
@@ -410,6 +431,11 @@ file_read_elf (int fildes, void *map_add
{
/* We can use the mmapped memory. */
elf->state.elf64.ehdr = ehdr;
+
+ if (unlikely (ehdr->e_shoff >= maxsize)
+ || unlikely (ehdr->e_shoff
+ + scncnt * sizeof (Elf32_Shdr) > maxsize))
+ goto free_and_out;
elf->state.elf64.shdr
= (Elf64_Shdr *) ((char *) ehdr + ehdr->e_shoff);
--- elfutils/libelf/elf_getarsym.c
+++ elfutils/libelf/elf_getarsym.c
@@ -179,6 +179,9 @@ elf_getarsym (elf, ptr)
size_t index_size = atol (tmpbuf);
if (SARMAG + sizeof (struct ar_hdr) + index_size > elf->maximum_size
+#if SIZE_MAX <= 4294967295U
+ || n >= SIZE_MAX / sizeof (Elf_Arsym)
+#endif
|| n * sizeof (uint32_t) > index_size)
{
/* This index table cannot be right since it does not fit into
--- elfutils/libelf/elf_getshdrstrndx.c
+++ elfutils/libelf/elf_getshdrstrndx.c
@@ -125,10 +125,25 @@ elf_getshdrstrndx (elf, dst)
if (elf->map_address != NULL
&& elf->state.elf32.ehdr->e_ident[EI_DATA] == MY_ELFDATA
&& (ALLOW_UNALIGNED
- || (((size_t) ((char *) elf->map_address + offset))
+ || (((size_t) ((char *) elf->map_address
+ + elf->start_offset + offset))
& (__alignof__ (Elf32_Shdr) - 1)) == 0))
- /* We can directly access the memory. */
- num = ((Elf32_Shdr *) (elf->map_address + offset))->sh_link;
+ {
+ /* First see whether the information in the ELF header is
+ valid and it does not ask for too much. */
+ if (unlikely (elf->maximum_size - offset
+ < sizeof (Elf32_Shdr)))
+ {
+ /* Something is wrong. */
+ __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
+ result = -1;
+ goto out;
+ }
+
+ /* We can directly access the memory. */
+ num = ((Elf32_Shdr *) (elf->map_address + elf->start_offset
+ + offset))->sh_link;
+ }
else
{
/* We avoid reading in all the section headers. Just read
@@ -163,10 +178,25 @@ elf_getshdrstrndx (elf, dst)
if (elf->map_address != NULL
&& elf->state.elf64.ehdr->e_ident[EI_DATA] == MY_ELFDATA
&& (ALLOW_UNALIGNED
- || (((size_t) ((char *) elf->map_address + offset))
+ || (((size_t) ((char *) elf->map_address
+ + elf->start_offset + offset))
& (__alignof__ (Elf64_Shdr) - 1)) == 0))
- /* We can directly access the memory. */
- num = ((Elf64_Shdr *) (elf->map_address + offset))->sh_link;
+ {
+ /* First see whether the information in the ELF header is
+ valid and it does not ask for too much. */
+ if (unlikely (elf->maximum_size - offset
+ < sizeof (Elf64_Shdr)))
+ {
+ /* Something is wrong. */
+ __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
+ result = -1;
+ goto out;
+ }
+
+ /* We can directly access the memory. */
+ num = ((Elf64_Shdr *) (elf->map_address + elf->start_offset
+ + offset))->sh_link;
+ }
else
{
/* We avoid reading in all the section headers. Just read
--- elfutils/libelf/elf_newscn.c
+++ elfutils/libelf/elf_newscn.c
@@ -104,10 +104,18 @@ elf_newscn (elf)
else
{
/* We must allocate a new element. */
- Elf_ScnList *newp;
+ Elf_ScnList *newp = NULL;
assert (elf->state.elf.scnincr > 0);
+ if (
+#if SIZE_MAX <= 4294967295U
+ likely (elf->state.elf.scnincr
+ < SIZE_MAX / 2 / sizeof (Elf_Scn) - sizeof (Elf_ScnList))
+#else
+ 1
+#endif
+ )
newp = (Elf_ScnList *) calloc (sizeof (Elf_ScnList)
+ ((elf->state.elf.scnincr *= 2)
* sizeof (Elf_Scn)), 1);
--- elfutils/libelf/gelf_getdyn.c
+++ elfutils/libelf/gelf_getdyn.c
@@ -1,5 +1,5 @@
/* Get information from dynamic table at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -93,7 +93,7 @@ gelf_getdyn (data, ndx, dst)
table entries has to be adopted. The user better has provided
a buffer where we can store the information. While copying the
data we are converting the format. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Dyn, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -114,7 +114,7 @@ gelf_getdyn (data, ndx, dst)
/* The data is already in the correct form. Just make sure the
index is OK. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Dyn) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, GElf_Dyn, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_getlib.c
+++ elfutils/libelf/gelf_getlib.c
@@ -1,5 +1,5 @@
/* Get library from table at the given index.
- Copyright (C) 2004 Red Hat, Inc.
+ Copyright (C) 2004-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2004.
@@ -86,7 +86,7 @@ gelf_getlib (data, ndx, dst)
/* The data is already in the correct form. Just make sure the
index is OK. */
GElf_Lib *result = NULL;
- if (unlikely ((ndx + 1) * sizeof (GElf_Lib) > data->d_size))
+ if (INVALID_NDX (ndx, GElf_Lib, data))
__libelf_seterrno (ELF_E_INVALID_INDEX);
else
{
--- elfutils/libelf/gelf_getmove.c
+++ elfutils/libelf/gelf_getmove.c
@@ -1,5 +1,5 @@
/* Get move structure at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -83,7 +83,7 @@ gelf_getmove (data, ndx, dst)
/* The data is already in the correct form. Just make sure the
index is OK. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Move) > data->d_size))
+ if (INVALID_NDX (ndx, GElf_Move, data))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_getrela.c
+++ elfutils/libelf/gelf_getrela.c
@@ -1,5 +1,5 @@
/* Get RELA relocation information at given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -71,12 +71,6 @@ gelf_getrela (data, ndx, dst)
if (data_scn == NULL)
return NULL;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return NULL;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_RELA))
{
__libelf_seterrno (ELF_E_INVALID_HANDLE);
@@ -93,7 +87,7 @@ gelf_getrela (data, ndx, dst)
if (scn->elf->class == ELFCLASS32)
{
/* We have to convert the data. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Rela, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
result = NULL;
@@ -114,7 +108,7 @@ gelf_getrela (data, ndx, dst)
{
/* Simply copy the data after we made sure we are actually getting
correct data. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Rela, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
result = NULL;
--- elfutils/libelf/gelf_getrel.c
+++ elfutils/libelf/gelf_getrel.c
@@ -1,5 +1,5 @@
/* Get REL relocation information at given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -71,12 +71,6 @@ gelf_getrel (data, ndx, dst)
if (data_scn == NULL)
return NULL;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return NULL;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_REL))
{
__libelf_seterrno (ELF_E_INVALID_HANDLE);
@@ -93,7 +87,7 @@ gelf_getrel (data, ndx, dst)
if (scn->elf->class == ELFCLASS32)
{
/* We have to convert the data. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
result = NULL;
@@ -113,7 +107,7 @@ gelf_getrel (data, ndx, dst)
{
/* Simply copy the data after we made sure we are actually getting
correct data. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
result = NULL;
--- elfutils/libelf/gelf_getsym.c
+++ elfutils/libelf/gelf_getsym.c
@@ -1,5 +1,5 @@
/* Get symbol information from symbol table at the given index.
- Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 1999-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 1999.
@@ -90,7 +90,7 @@ gelf_getsym (data, ndx, dst)
table entries has to be adopted. The user better has provided
a buffer where we can store the information. While copying the
data we are converting the format. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data->d_size))
+ if (INVALID_NDX (ndx, Elf32_Sym, data))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -119,7 +119,7 @@ gelf_getsym (data, ndx, dst)
/* The data is already in the correct form. Just make sure the
index is OK. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Sym) > data->d_size))
+ if (INVALID_NDX (ndx, GElf_Sym, data))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_getsyminfo.c
+++ elfutils/libelf/gelf_getsyminfo.c
@@ -1,5 +1,5 @@
/* Get additional symbol information from symbol table at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -84,7 +84,7 @@ gelf_getsyminfo (data, ndx, dst)
/* The data is already in the correct form. Just make sure the
index is OK. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data->d_size))
+ if (INVALID_NDX (ndx, GElf_Syminfo, data))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_getsymshndx.c
+++ elfutils/libelf/gelf_getsymshndx.c
@@ -1,6 +1,6 @@
/* Get symbol information and separate section index from symbol table
at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -90,7 +90,7 @@ gelf_getsymshndx (symdata, shndxdata, nd
section index table. */
if (likely (shndxdata_scn != NULL))
{
- if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Word, &shndxdata_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -110,7 +110,7 @@ gelf_getsymshndx (symdata, shndxdata, nd
table entries has to be adopted. The user better has provided
a buffer where we can store the information. While copying the
data we are converting the format. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata->d_size))
+ if (INVALID_NDX (ndx, Elf32_Sym, symdata))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -139,7 +139,7 @@ gelf_getsymshndx (symdata, shndxdata, nd
/* The data is already in the correct form. Just make sure the
index is OK. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Sym) > symdata->d_size))
+ if (INVALID_NDX (ndx, GElf_Sym, symdata))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_getversym.c
+++ elfutils/libelf/gelf_getversym.c
@@ -1,5 +1,5 @@
/* Get symbol version information at the given index.
- Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 1999-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 1999.
@@ -92,7 +92,7 @@ gelf_getversym (data, ndx, dst)
/* The data is already in the correct form. Just make sure the
index is OK. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Versym) > data->d_size))
+ if (INVALID_NDX (ndx, GElf_Versym, data))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
result = NULL;
--- elfutils/libelf/gelf_update_dyn.c
+++ elfutils/libelf/gelf_update_dyn.c
@@ -1,5 +1,5 @@
/* Update information in dynamic table at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -71,12 +71,6 @@ gelf_update_dyn (data, ndx, src)
if (data == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_DYN))
{
/* The type of the data better should match. */
@@ -102,7 +96,7 @@ gelf_update_dyn (data, ndx, src)
}
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Dyn, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -116,7 +110,7 @@ gelf_update_dyn (data, ndx, src)
else
{
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Dyn) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Dyn, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_update_lib.c
+++ elfutils/libelf/gelf_update_lib.c
@@ -1,5 +1,5 @@
/* Update library in table at the given index.
- Copyright (C) 2004 Red Hat, Inc.
+ Copyright (C) 2004-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2004.
@@ -68,12 +68,6 @@ gelf_update_lib (data, ndx, src)
if (data == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
if (unlikely (data_scn->d.d_type != ELF_T_LIB))
{
@@ -87,7 +81,7 @@ gelf_update_lib (data, ndx, src)
/* Check whether we have to resize the data buffer. */
int result = 0;
- if (unlikely ((ndx + 1) * sizeof (Elf64_Lib) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Lib, &data_scn->d))
__libelf_seterrno (ELF_E_INVALID_INDEX);
else
{
--- elfutils/libelf/gelf_update_move.c
+++ elfutils/libelf/gelf_update_move.c
@@ -1,5 +1,5 @@
/* Update move structure at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -75,8 +75,7 @@ gelf_update_move (data, ndx, src)
assert (sizeof (GElf_Move) == sizeof (Elf64_Move));
/* Check whether we have to resize the data buffer. */
- if (unlikely (ndx < 0)
- || unlikely ((ndx + 1) * sizeof (GElf_Move) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, GElf_Move, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
return 0;
--- elfutils/libelf/gelf_update_rela.c
+++ elfutils/libelf/gelf_update_rela.c
@@ -1,5 +1,5 @@
/* Update RELA relocation information at given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -68,12 +68,6 @@ gelf_update_rela (Elf_Data *dst, int ndx
if (dst == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_RELA))
{
/* The type of the data better should match. */
@@ -101,7 +95,7 @@ gelf_update_rela (Elf_Data *dst, int ndx
}
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Rela, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -117,7 +111,7 @@ gelf_update_rela (Elf_Data *dst, int ndx
else
{
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Rela, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_update_rel.c
+++ elfutils/libelf/gelf_update_rel.c
@@ -1,5 +1,5 @@
/* Update REL relocation information at given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -68,12 +68,6 @@ gelf_update_rel (Elf_Data *dst, int ndx,
if (dst == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_REL))
{
/* The type of the data better should match. */
@@ -99,7 +93,7 @@ gelf_update_rel (Elf_Data *dst, int ndx,
}
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -114,7 +108,7 @@ gelf_update_rel (Elf_Data *dst, int ndx,
else
{
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_update_sym.c
+++ elfutils/libelf/gelf_update_sym.c
@@ -1,5 +1,5 @@
/* Update symbol information in symbol table at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -72,12 +72,6 @@ gelf_update_sym (data, ndx, src)
if (data == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_SYM))
{
/* The type of the data better should match. */
@@ -102,7 +96,7 @@ gelf_update_sym (data, ndx, src)
}
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Sym, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -125,7 +119,7 @@ gelf_update_sym (data, ndx, src)
else
{
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Sym, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_update_syminfo.c
+++ elfutils/libelf/gelf_update_syminfo.c
@@ -1,5 +1,5 @@
/* Update additional symbol information in symbol table at the given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -72,12 +72,6 @@ gelf_update_syminfo (data, ndx, src)
if (data == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
if (unlikely (data_scn->d.d_type != ELF_T_SYMINFO))
{
/* The type of the data better should match. */
@@ -93,7 +87,7 @@ gelf_update_syminfo (data, ndx, src)
rwlock_wrlock (scn->elf->lock);
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, GElf_Syminfo, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_update_symshndx.c
+++ elfutils/libelf/gelf_update_symshndx.c
@@ -1,6 +1,6 @@
/* Update symbol information and section index in symbol table at the
given index.
- Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2000-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
@@ -77,12 +77,6 @@ gelf_update_symshndx (symdata, shndxdata
if (symdata == NULL)
return 0;
- if (unlikely (ndx < 0))
- {
- __libelf_seterrno (ELF_E_INVALID_INDEX);
- return 0;
- }
-
if (unlikely (symdata_scn->d.d_type != ELF_T_SYM))
{
/* The type of the data better should match. */
@@ -128,7 +122,7 @@ gelf_update_symshndx (symdata, shndxdata
}
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf32_Sym, &symdata_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
@@ -151,7 +145,7 @@ gelf_update_symshndx (symdata, shndxdata
else
{
/* Check whether we have to resize the data buffer. */
- if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > symdata_scn->d.d_size))
+ if (INVALID_NDX (ndx, Elf64_Sym, &symdata_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
--- elfutils/libelf/gelf_update_versym.c
+++ elfutils/libelf/gelf_update_versym.c
@@ -1,5 +1,5 @@
/* Update symbol version information.
- Copyright (C) 2001, 2002 Red Hat, Inc.
+ Copyright (C) 2001-2009 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2001.
@@ -75,8 +75,7 @@ gelf_update_versym (data, ndx, src)
assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym));
/* Check whether we have to resize the data buffer. */
- if (unlikely (ndx < 0)
- || unlikely ((ndx + 1) * sizeof (GElf_Versym) > data_scn->d.d_size))
+ if (INVALID_NDX (ndx, GElf_Versym, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
return 0;
--- elfutils/libelf/libelfP.h
+++ elfutils/libelf/libelfP.h
@@ -608,4 +608,8 @@ extern uint32_t __libelf_crc32 (uint32_t
/* Align offset to 4 bytes as needed for note name and descriptor data. */
#define NOTE_ALIGN(n) (((n) + 3) & -4U)
+/* Convenience macro. */
+#define INVALID_NDX(ndx, type, data) \
+ unlikely ((data)->d_size / sizeof (type) <= (unsigned int) (ndx))
+
#endif /* libelfP.h */
--- elfutils/src/ChangeLog
+++ elfutils/src/ChangeLog
@@ -1710,6 +1710,16 @@
object symbols or symbols with unknown type.
(check_rel): Likewise.
+2005-06-09 Roland McGrath <roland@redhat.com>
+
+ * readelf.c (handle_dynamic, handle_symtab): Check for bogus sh_link.
+ (handle_verneed, handle_verdef, handle_versym, handle_hash): Likewise.
+ (handle_scngrp): Check for bogus sh_info.
+
+ * strip.c (handle_elf): Check for bogus values in sh_link, sh_info,
+ st_shndx, e_shstrndx, and SHT_GROUP or SHT_SYMTAB_SHNDX data.
+ Don't use assert on input values, instead bail with "illformed" error.
+
2005-06-08 Roland McGrath <roland@redhat.com>
* readelf.c (print_ops): Add consts.
@@ -1755,6 +1765,19 @@
* readelf.c (dwarf_tag_string): Add new tags.
+2005-05-17 Jakub Jelinek <jakub@redhat.com>
+
+ * elflint.c (check_hash): Don't check entries beyond end of section.
+ (check_note): Don't crash if gelf_rawchunk fails.
+ (section_name): Return <invalid> if gelf_getshdr returns NULL.
+
+2005-05-14 Jakub Jelinek <jakub@redhat.com>
+
+ * elflint.c (section_name): Return "<invalid>" instead of
+ crashing on invalid section name.
+ (check_symtab, is_rel_dyn, check_rela, check_rel, check_dynamic,
+ check_symtab_shndx, check_hash, check_versym): Robustify.
+
2005-05-08 Roland McGrath <roland@redhat.com>
* strip.c (handle_elf): Don't translate hash and versym data formats,
--- elfutils/src/elflint.c
+++ elfutils/src/elflint.c
@@ -131,6 +131,10 @@ static uint32_t shstrndx;
/* Array to count references in section groups. */
static int *scnref;
+/* Numbers of sections and program headers. */
+static unsigned int shnum;
+static unsigned int phnum;
+
int
main (int argc, char *argv[])
@@ -319,10 +323,19 @@ section_name (Ebl *ebl, int idx)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr;
+ const char *ret;
+
+ if ((unsigned int) idx > shnum)
+ return "<invalid>";
shdr = gelf_getshdr (elf_getscn (ebl->elf, idx), &shdr_mem);
+ if (shdr == NULL)
+ return "<invalid>";
- return elf_strptr (ebl->elf, shstrndx, shdr->sh_name);
+ ret = elf_strptr (ebl->elf, shstrndx, shdr->sh_name);
+ if (ret == NULL)
+ return "<invalid>";
+ return ret;
}
@@ -344,11 +357,6 @@ static const int valid_e_machine[] =
(sizeof (valid_e_machine) / sizeof (valid_e_machine[0]))
-/* Numbers of sections and program headers. */
-static unsigned int shnum;
-static unsigned int phnum;
-
-
static void
check_elf_header (Ebl *ebl, GElf_Ehdr *ehdr, size_t size)
{
@@ -632,7 +640,8 @@ section [%2d] '%s': symbol table cannot
}
}
- if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT))
+ size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT);
+ if (shdr->sh_entsize != sh_entsize)
ERROR (gettext ("\
section [%2u] '%s': entry size is does not match ElfXX_Sym\n"),
idx, section_name (ebl, idx));
@@ -670,7 +679,7 @@ section [%2d] '%s': XINDEX for zeroth en
xndxscnidx, section_name (ebl, xndxscnidx));
}
- for (size_t cnt = 1; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt)
+ for (size_t cnt = 1; cnt < shdr->sh_size / sh_entsize; ++cnt)
{
sym = gelf_getsymshndx (data, xndxdata, cnt, &sym_mem, &xndx);
if (sym == NULL)
@@ -690,7 +699,8 @@ section [%2d] '%s': symbol %zu: invalid
else
{
name = elf_strptr (ebl->elf, shdr->sh_link, sym->st_name);
- assert (name != NULL);
+ assert (name != NULL
+ || strshdr->sh_type != SHT_STRTAB);
}
if (sym->st_shndx == SHN_XINDEX)
@@ -1039,9 +1049,11 @@ is_rel_dyn (Ebl *ebl, const GElf_Ehdr *e
{
GElf_Shdr rcshdr_mem;
const GElf_Shdr *rcshdr = gelf_getshdr (scn, &rcshdr_mem);
- assert (rcshdr != NULL);
- if (rcshdr->sh_type == SHT_DYNAMIC)
+ if (rcshdr == NULL)
+ break;
+
+ if (rcshdr->sh_type == SHT_DYNAMIC && rcshdr->sh_entsize)
{
/* Found the dynamic section. Look through it. */
Elf_Data *d = elf_getdata (scn, NULL);
@@ -1051,7 +1063,9 @@ is_rel_dyn (Ebl *ebl, const GElf_Ehdr *e
{
GElf_Dyn dyn_mem;
GElf_Dyn *dyn = gelf_getdyn (d, cnt, &dyn_mem);
- assert (dyn != NULL);
+
+ if (dyn == NULL)
+ break;
if (dyn->d_tag == DT_RELCOUNT)
{
@@ -1065,7 +1079,9 @@ section [%2d] '%s': DT_RELCOUNT used for
/* Does the number specified number of relative
relocations exceed the total number of
relocations? */
- if (dyn->d_un.d_val > shdr->sh_size / shdr->sh_entsize)
+ if (shdr->sh_entsize != 0
+ && dyn->d_un.d_val > (shdr->sh_size
+ / shdr->sh_entsize))
ERROR (gettext ("\
section [%2d] '%s': DT_RELCOUNT value %d too high for this section\n"),
idx, section_name (ebl, idx),
@@ -1225,7 +1241,8 @@ section [%2d] '%s': no relocations for m
}
}
- if (shdr->sh_entsize != gelf_fsize (ebl->elf, reltype, 1, EV_CURRENT))
+ size_t sh_entsize = gelf_fsize (ebl->elf, reltype, 1, EV_CURRENT);
+ if (shdr->sh_entsize != sh_entsize)
ERROR (gettext (reltype == ELF_T_RELA ? "\
section [%2d] '%s': section entry size does not match ElfXX_Rela\n" : "\
section [%2d] '%s': section entry size does not match ElfXX_Rel\n"),
@@ -1448,7 +1465,8 @@ check_rela (Ebl *ebl, GElf_Ehdr *ehdr, G
Elf_Data *symdata = elf_getdata (symscn, NULL);
enum load_state state = state_undecided;
- for (size_t cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt)
+ size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_RELA, 1, EV_CURRENT);
+ for (size_t cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt)
{
GElf_Rela rela_mem;
GElf_Rela *rela = gelf_getrela (data, cnt, &rela_mem);
@@ -1498,7 +1516,8 @@ check_rel (Ebl *ebl, GElf_Ehdr *ehdr, GE
Elf_Data *symdata = elf_getdata (symscn, NULL);
enum load_state state = state_undecided;
- for (size_t cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt)
+ size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_REL, 1, EV_CURRENT);
+ for (size_t cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt)
{
GElf_Rel rel_mem;
GElf_Rel *rel = gelf_getrel (data, cnt, &rel_mem);
@@ -1597,7 +1616,8 @@ section [%2d] '%s': referenced as string
shdr->sh_link, section_name (ebl, shdr->sh_link),
idx, section_name (ebl, idx));
- if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_DYN, 1, EV_CURRENT))
+ size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_DYN, 1, EV_CURRENT);
+ if (shdr->sh_entsize != sh_entsize)
ERROR (gettext ("\
section [%2d] '%s': section entry size does not match ElfXX_Dyn\n"),
idx, section_name (ebl, idx));
@@ -1607,7 +1627,7 @@ section [%2d] '%s': section entry size d
idx, section_name (ebl, idx));
bool non_null_warned = false;
- for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt)
+ for (cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt)
{
GElf_Dyn dyn_mem;
GElf_Dyn *dyn = gelf_getdyn (data, cnt, &dyn_mem);
@@ -1879,6 +1899,8 @@ section [%2d] '%s': entry size does not
idx, section_name (ebl, idx));
if (symshdr != NULL
+ && shdr->sh_entsize
+ && symshdr->sh_entsize
&& (shdr->sh_size / shdr->sh_entsize
< symshdr->sh_size / symshdr->sh_entsize))
ERROR (gettext ("\
@@ -1905,6 +1927,12 @@ section [%2d] '%s': extended section ind
}
Elf_Data *data = elf_getdata (elf_getscn (ebl->elf, idx), NULL);
+ if (data == NULL)
+ {
+ ERROR (gettext ("section [%2d] '%s': cannot get section data\n"),
+ idx, section_name (ebl, idx));
+ return;
+ }
if (*((Elf32_Word *) data->d_buf) != 0)
ERROR (gettext ("symbol 0 should have zero extended section index\n"));
@@ -1947,7 +1975,7 @@ section [%2d] '%s': hash table section i
size_t maxidx = nchain;
- if (symshdr != NULL)
+ if (symshdr != NULL && symshdr->sh_entsize != 0)
{
size_t symsize = symshdr->sh_size / symshdr->sh_entsize;
@@ -1958,18 +1986,28 @@ section [%2d] '%s': hash table section i
maxidx = symsize;
}
+ Elf32_Word *buf = (Elf32_Word *) data->d_buf;
+ Elf32_Word *end = (Elf32_Word *) ((char *) data->d_buf + shdr->sh_size);
size_t cnt;
for (cnt = 2; cnt < 2 + nbucket; ++cnt)
- if (((Elf32_Word *) data->d_buf)[cnt] >= maxidx)
+ {
+ if (buf + cnt >= end)
+ break;
+ else if (buf[cnt] >= maxidx)
ERROR (gettext ("\
section [%2d] '%s': hash bucket reference %zu out of bounds\n"),
idx, section_name (ebl, idx), cnt - 2);
+ }
for (; cnt < 2 + nbucket + nchain; ++cnt)
- if (((Elf32_Word *) data->d_buf)[cnt] >= maxidx)
+ {
+ if (buf + cnt >= end)
+ break;
+ else if (buf[cnt] >= maxidx)
ERROR (gettext ("\
section [%2d] '%s': hash chain reference %zu out of bounds\n"),
idx, section_name (ebl, idx), cnt - 2 - nbucket);
+ }
}
@@ -1999,18 +2037,28 @@ section [%2d] '%s': hash table section i
maxidx = symsize;
}
+ Elf64_Xword *buf = (Elf64_Xword *) data->d_buf;
+ Elf64_Xword *end = (Elf64_Xword *) ((char *) data->d_buf + shdr->sh_size);
size_t cnt;
for (cnt = 2; cnt < 2 + nbucket; ++cnt)
- if (((Elf64_Xword *) data->d_buf)[cnt] >= maxidx)
+ {
+ if (buf + cnt >= end)
+ break;
+ else if (buf[cnt] >= maxidx)
ERROR (gettext ("\
section [%2d] '%s': hash bucket reference %zu out of bounds\n"),
idx, section_name (ebl, idx), cnt - 2);
+ }
for (; cnt < 2 + nbucket + nchain; ++cnt)
- if (((Elf64_Xword *) data->d_buf)[cnt] >= maxidx)
+ {
+ if (buf + cnt >= end)
+ break;
+ else if (buf[cnt] >= maxidx)
ERROR (gettext ("\
section [%2d] '%s': hash chain reference %" PRIu64 " out of bounds\n"),
- idx, section_name (ebl, idx), (uint64_t) (cnt - 2 - nbucket));
+ idx, section_name (ebl, idx), (uint64_t) cnt - 2 - nbucket);
+ }
}
@@ -2035,7 +2083,7 @@ section [%2d] '%s': bitmask size not pow
if (shdr->sh_size < (4 + bitmask_words + nbuckets) * sizeof (Elf32_Word))
{
ERROR (gettext ("\
-section [%2d] '%s': hash table section is too small (is %ld, expected at least%ld)\n"),
+section [%2d] '%s': hash table section is too small (is %ld, expected at least %ld)\n"),
idx, section_name (ebl, idx), (long int) shdr->sh_size,
(long int) ((4 + bitmask_words + nbuckets) * sizeof (Elf32_Word)));
return;
@@ -2707,8 +2755,9 @@ section [%2d] '%s' refers in sh_link to
/* The number of elements in the version symbol table must be the
same as the number of symbols. */
- if (shdr->sh_size / shdr->sh_entsize
- != symshdr->sh_size / symshdr->sh_entsize)
+ if (shdr->sh_entsize && symshdr->sh_entsize
+ && (shdr->sh_size / shdr->sh_entsize
+ != symshdr->sh_size / symshdr->sh_entsize))
ERROR (gettext ("\
section [%2d] '%s' has different number of entries than symbol table [%2d] '%s'\n"),
idx, section_name (ebl, idx),
--- elfutils/src/readelf.c
+++ elfutils/src/readelf.c
@@ -1178,6 +1178,8 @@ handle_scngrp (Ebl *ebl, Elf_Scn *scn, G
Elf32_Word *grpref = (Elf32_Word *) data->d_buf;
GElf_Sym sym_mem;
+ GElf_Sym *sym = gelf_getsym (symdata, shdr->sh_info, &sym_mem);
+
printf ((grpref[0] & GRP_COMDAT)
? ngettext ("\
\nCOMDAT section group [%2zu] '%s' with signature '%s' contains %zu entry:\n",
@@ -1190,8 +1192,8 @@ handle_scngrp (Ebl *ebl, Elf_Scn *scn, G
data->d_size / sizeof (Elf32_Word) - 1),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
- elf_strptr (ebl->elf, symshdr->sh_link,
- gelf_getsym (symdata, shdr->sh_info, &sym_mem)->st_name)
+ (sym == NULL ? NULL
+ : elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name))
?: gettext ("<INVALID SYMBOL>"),
data->d_size / sizeof (Elf32_Word) - 1);
@@ -1342,7 +1344,8 @@ static void
handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
int class = gelf_getclass (ebl->elf);
- GElf_Shdr glink;
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink;
Elf_Data *data;
size_t cnt;
size_t shstrndx;
@@ -1357,6 +1360,11 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn,
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
+ glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem);
+ if (glink == NULL)
+ error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+
printf (ngettext ("\
\nDynamic segment contains %lu entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
@@ -1366,9 +1374,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn,
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(int) shdr->sh_link,
- elf_strptr (ebl->elf, shstrndx,
- gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
- &glink)->sh_name));
+ elf_strptr (ebl->elf, shstrndx, glink->sh_name));
fputs_unlocked (gettext (" Type Value\n"), stdout);
for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt)
@@ -1951,6 +1957,13 @@ handle_symtab (Ebl *ebl, Elf_Scn *scn, G
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
+ &glink_mem);
+ if (glink == NULL)
+ error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+
/* Now we can compute the number of entries in the section. */
unsigned int nsyms = data->d_size / (class == ELFCLASS32
? sizeof (Elf32_Sym)
@@ -1961,15 +1974,12 @@ handle_symtab (Ebl *ebl, Elf_Scn *scn, G
nsyms),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name), nsyms);
- GElf_Shdr glink;
printf (ngettext (" %lu local symbol String table: [%2u] '%s'\n",
" %lu local symbols String table: [%2u] '%s'\n",
shdr->sh_info),
(unsigned long int) shdr->sh_info,
(unsigned int) shdr->sh_link,
- elf_strptr (ebl->elf, shstrndx,
- gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
- &glink)->sh_name));
+ elf_strptr (ebl->elf, shstrndx, glink->sh_name));
fputs_unlocked (class == ELFCLASS32
? gettext ("\
@@ -2205,7 +2215,13 @@ handle_verneed (Ebl *ebl, Elf_Scn *scn,
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
- GElf_Shdr glink;
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
+ &glink_mem);
+ if (glink == NULL)
+ error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+
printf (ngettext ("\
\nVersion needs section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
@@ -2216,9 +2232,7 @@ handle_verneed (Ebl *ebl, Elf_Scn *scn,
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
- elf_strptr (ebl->elf, shstrndx,
- gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
- &glink)->sh_name));
+ elf_strptr (ebl->elf, shstrndx, glink->sh_name));
unsigned int offset = 0;
for (int cnt = shdr->sh_info; --cnt >= 0; )
@@ -2271,8 +2285,14 @@ handle_verdef (Ebl *ebl, Elf_Scn *scn, G
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
+ &glink_mem);
+ if (glink == NULL)
+ error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+
int class = gelf_getclass (ebl->elf);
- GElf_Shdr glink;
printf (ngettext ("\
\nVersion definition section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
@@ -2284,9 +2304,7 @@ handle_verdef (Ebl *ebl, Elf_Scn *scn, G
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
- elf_strptr (ebl->elf, shstrndx,
- gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
- &glink)->sh_name));
+ elf_strptr (ebl->elf, shstrndx, glink->sh_name));
unsigned int offset = 0;
for (int cnt = shdr->sh_info; --cnt >= 0; )
@@ -2548,8 +2566,14 @@ handle_versym (Ebl *ebl, Elf_Scn *scn, G
filename = NULL;
}
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
+ &glink_mem);
+ if (glink == NULL)
+ error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+
/* Print the header. */
- GElf_Shdr glink;
printf (ngettext ("\
\nVersion symbols section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'",
"\
@@ -2561,9 +2585,7 @@ handle_versym (Ebl *ebl, Elf_Scn *scn, G
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
- elf_strptr (ebl->elf, shstrndx,
- gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
- &glink)->sh_name));
+ elf_strptr (ebl->elf, shstrndx, glink->sh_name));
/* Now we can finally look at the actual contents of this section. */
for (unsigned int cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt)
@@ -2615,7 +2637,17 @@ print_hash_info (Ebl *ebl, Elf_Scn *scn,
for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt)
++counts[lengths[cnt]];
- GElf_Shdr glink;
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf,
+ shdr->sh_link),
+ &glink_mem);
+ if (glink == NULL)
+ {
+ error (0, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+ return;
+ }
+
printf (ngettext ("\
\nHistogram for bucket list length in section [%2u] '%s' (total of %d bucket):\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
@@ -2628,9 +2660,7 @@ print_hash_info (Ebl *ebl, Elf_Scn *scn,
shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
- elf_strptr (ebl->elf, shstrndx,
- gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
- &glink)->sh_name));
+ elf_strptr (ebl->elf, shstrndx, glink->sh_name));
if (extrastr != NULL)
fputs (extrastr, stdout);
@@ -4486,6 +4516,16 @@ print_debug_aranges_section (Dwfl_Module
return;
}
+ GElf_Shdr glink_mem;
+ GElf_Shdr *glink;
+ glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem);
+ if (glink == NULL)
+ {
+ error (0, 0, gettext ("invalid sh_link value in section %Zu"),
+ elf_ndxscn (scn));
+ return;
+ }
+
printf (ngettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 " contains %zu entry:\n",
"\
--- elfutils/src/strip.c
+++ elfutils/src/strip.c
@@ -555,6 +555,11 @@ handle_elf (int fd, Elf *elf, const char
goto fail_close;
}
+ if (shstrndx >= shnum)
+ goto illformed;
+
+#define elf_assert(test) do { if (!(test)) goto illformed; } while (0)
+
/* Storage for section information. We leave room for two more
entries since we unconditionally create a section header string
table. Maybe some weird tool created an ELF file without one.
@@ -576,7 +581,7 @@ handle_elf (int fd, Elf *elf, const char
{
/* This should always be true (i.e., there should not be any
holes in the numbering). */
- assert (elf_ndxscn (scn) == cnt);
+ elf_assert (elf_ndxscn (scn) == cnt);
shdr_info[cnt].scn = scn;
@@ -589,6 +594,7 @@ handle_elf (int fd, Elf *elf, const char
shdr_info[cnt].shdr.sh_name);
if (shdr_info[cnt].name == NULL)
{
+ illformed:
error (0, 0, gettext ("illformed file '%s'"), fname);
goto fail_close;
}
@@ -598,6 +604,8 @@ handle_elf (int fd, Elf *elf, const char
/* Remember the shdr.sh_link value. */
shdr_info[cnt].old_sh_link = shdr_info[cnt].shdr.sh_link;
+ if (shdr_info[cnt].old_sh_link >= shnum)
+ goto illformed;
/* Sections in files other than relocatable object files which
are not loaded can be freely moved by us. In relocatable
@@ -610,7 +618,7 @@ handle_elf (int fd, Elf *elf, const char
appropriate reference. */
if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB_SHNDX))
{
- assert (shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx == 0);
+ elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx == 0);
shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx = cnt;
}
else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GROUP))
@@ -627,7 +635,12 @@ handle_elf (int fd, Elf *elf, const char
for (inner = 1;
inner < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
++inner)
+ {
+ if (grpref[inner] < shnum)
shdr_info[grpref[inner]].group_idx = cnt;
+ else
+ goto illformed;
+ }
if (inner == 1 || (inner == 2 && (grpref[0] & GRP_COMDAT) == 0))
/* If the section group contains only one element and this
@@ -638,7 +651,7 @@ handle_elf (int fd, Elf *elf, const char
}
else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym))
{
- assert (shdr_info[shdr_info[cnt].shdr.sh_link].version_idx == 0);
+ elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].version_idx == 0);
shdr_info[shdr_info[cnt].shdr.sh_link].version_idx = cnt;
}
@@ -646,7 +659,7 @@ handle_elf (int fd, Elf *elf, const char
discarded right away. */
if ((shdr_info[cnt].shdr.sh_flags & SHF_GROUP) != 0)
{
- assert (shdr_info[cnt].group_idx != 0);
+ elf_assert (shdr_info[cnt].group_idx != 0);
if (shdr_info[shdr_info[cnt].group_idx].idx == 0)
{
@@ -722,11 +735,15 @@ handle_elf (int fd, Elf *elf, const char
{
/* If a relocation section is marked as being removed make
sure the section it is relocating is removed, too. */
- if ((shdr_info[cnt].shdr.sh_type == SHT_REL
+ if (shdr_info[cnt].shdr.sh_type == SHT_REL
|| shdr_info[cnt].shdr.sh_type == SHT_RELA)
- && shdr_info[shdr_info[cnt].shdr.sh_info].idx != 0)
+ {
+ if (shdr_info[cnt].shdr.sh_info >= shnum)
+ goto illformed;
+ else if (shdr_info[shdr_info[cnt].shdr.sh_info].idx != 0)
shdr_info[cnt].idx = 1;
}
+ }
if (shdr_info[cnt].idx == 1)
{
@@ -753,7 +770,7 @@ handle_elf (int fd, Elf *elf, const char
if (shdr_info[cnt].symtab_idx != 0
&& shdr_info[shdr_info[cnt].symtab_idx].data == NULL)
{
- assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB);
+ elf_assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB);
shdr_info[shdr_info[cnt].symtab_idx].data
= elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn,
@@ -793,6 +810,9 @@ handle_elf (int fd, Elf *elf, const char
else if (scnidx == SHN_XINDEX)
scnidx = xndx;
+ if (scnidx >= shnum)
+ goto illformed;
+
if (shdr_info[scnidx].idx == 0)
/* This symbol table has a real symbol in
a discarded section. So preserve the
@@ -823,12 +843,16 @@ handle_elf (int fd, Elf *elf, const char
}
/* Handle references through sh_info. */
- if (SH_INFO_LINK_P (&shdr_info[cnt].shdr)
- && shdr_info[shdr_info[cnt].shdr.sh_info].idx == 0)
+ if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
+ {
+ if (shdr_info[cnt].shdr.sh_info >= shnum)
+ goto illformed;
+ else if ( shdr_info[shdr_info[cnt].shdr.sh_info].idx == 0)
{
shdr_info[shdr_info[cnt].shdr.sh_info].idx = 1;
changes |= shdr_info[cnt].shdr.sh_info < cnt;
}
+ }
/* Mark the section as investigated. */
shdr_info[cnt].idx = 2;
@@ -967,7 +991,7 @@ handle_elf (int fd, Elf *elf, const char
error (EXIT_FAILURE, 0, gettext ("while generating output file: %s"),
elf_errmsg (-1));
- assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
+ elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
/* Add this name to the section header string table. */
shdr_info[cnt].se = ebl_strtabadd (shst, shdr_info[cnt].name, 0);
@@ -1004,7 +1028,7 @@ handle_elf (int fd, Elf *elf, const char
error (EXIT_FAILURE, 0,
gettext ("while create section header section: %s"),
elf_errmsg (-1));
- assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
+ elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
shdr_info[cnt].data = elf_newdata (shdr_info[cnt].newscn);
if (shdr_info[cnt].data == NULL)
@@ -1060,7 +1084,7 @@ handle_elf (int fd, Elf *elf, const char
error (EXIT_FAILURE, 0,
gettext ("while create section header section: %s"),
elf_errmsg (-1));
- assert (elf_ndxscn (shdr_info[cnt].newscn) == idx);
+ elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == idx);
/* Finalize the string table and fill in the correct indices in the
section headers. */
@@ -1150,20 +1174,20 @@ handle_elf (int fd, Elf *elf, const char
shndxdata = elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn,
NULL);
- assert ((versiondata->d_size / sizeof (Elf32_Word))
+ elf_assert ((versiondata->d_size / sizeof (Elf32_Word))
>= shdr_info[cnt].data->d_size / elsize);
}
if (shdr_info[cnt].version_idx != 0)
{
- assert (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM);
+ elf_assert (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM);
/* This section has associated version
information. We have to modify that
information, too. */
versiondata = elf_getdata (shdr_info[shdr_info[cnt].version_idx].scn,
NULL);
- assert ((versiondata->d_size / sizeof (GElf_Versym))
+ elf_assert ((versiondata->d_size / sizeof (GElf_Versym))
>= shdr_info[cnt].data->d_size / elsize);
}
@@ -1218,7 +1242,7 @@ handle_elf (int fd, Elf *elf, const char
sec = shdr_info[sym->st_shndx].idx;
else
{
- assert (shndxdata != NULL);
+ elf_assert (shndxdata != NULL);
sec = shdr_info[xshndx].idx;
}
@@ -1239,7 +1263,7 @@ handle_elf (int fd, Elf *elf, const char
nxshndx = sec;
}
- assert (sec < SHN_LORESERVE || shndxdata != NULL);
+ elf_assert (sec < SHN_LORESERVE || shndxdata != NULL);
if ((inner != destidx || nshndx != sym->st_shndx
|| (shndxdata != NULL && nxshndx != xshndx))
@@ -1263,7 +1287,7 @@ handle_elf (int fd, Elf *elf, const char
|| shdr_info[cnt].debug_data == NULL)
/* This is a section symbol for a section which has
been removed. */
- assert (GELF_ST_TYPE (sym->st_info) == STT_SECTION);
+ elf_assert (GELF_ST_TYPE (sym->st_info) == STT_SECTION);
}
if (destidx != inner)
@@ -1450,11 +1474,11 @@ handle_elf (int fd, Elf *elf, const char
{
GElf_Sym sym_mem;
GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem);
- assert (sym != NULL);
+ elf_assert (sym != NULL);
const char *name = elf_strptr (elf, strshndx,
sym->st_name);
- assert (name != NULL);
+ elf_assert (name != NULL);
size_t hidx = elf_hash (name) % nbucket;
if (bucket[hidx] == 0)
@@ -1473,7 +1497,7 @@ handle_elf (int fd, Elf *elf, const char
else
{
/* Alpha and S390 64-bit use 64-bit SHT_HASH entries. */
- assert (shdr_info[cnt].shdr.sh_entsize
+ elf_assert (shdr_info[cnt].shdr.sh_entsize
== sizeof (Elf64_Xword));
Elf64_Xword *bucket = (Elf64_Xword *) hashd->d_buf;
@@ -1504,11 +1528,11 @@ handle_elf (int fd, Elf *elf, const char
{
GElf_Sym sym_mem;
GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem);
- assert (sym != NULL);
+ elf_assert (sym != NULL);
const char *name = elf_strptr (elf, strshndx,
sym->st_name);
- assert (name != NULL);
+ elf_assert (name != NULL);
size_t hidx = elf_hash (name) % nbucket;
if (bucket[hidx] == 0)
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