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Ensure that decompressed sections have the correct alignment.

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Related: #1678204
This commit is contained in:
Nick Clifton 2019-02-18 13:12:18 +00:00
parent cfd1d13e29
commit 39087c2367
2 changed files with 456 additions and 1 deletions
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447
binutils-alignment-of-decompressed-sections.patch Normal file
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@ -0,0 +1,447 @@
diff -rup binutils.orig/bfd/bfd.c binutils-2.31.1/bfd/bfd.c
--- binutils.orig/bfd/bfd.c 2019-02-18 11:53:32.155652114 +0000
+++ binutils-2.31.1/bfd/bfd.c 2019-02-18 12:03:21.591459682 +0000
@@ -2332,6 +2332,8 @@ bfd_update_compression_header (bfd *abfd
bfd_put_32 (abfd, sec->size, &echdr->ch_size);
bfd_put_32 (abfd, 1 << sec->alignment_power,
&echdr->ch_addralign);
+ /* bfd_log2 (alignof (Elf32_Chdr)). */
+ bfd_set_section_alignment (abfd, sec, 2);
}
else
{
@@ -2342,6 +2344,8 @@ bfd_update_compression_header (bfd *abfd
bfd_put_64 (abfd, sec->size, &echdr->ch_size);
bfd_put_64 (abfd, 1 << sec->alignment_power,
&echdr->ch_addralign);
+ /* bfd_log2 (alignof (Elf64_Chdr)). */
+ bfd_set_section_alignment (abfd, sec, 3);
}
}
else
@@ -2354,6 +2358,8 @@ bfd_update_compression_header (bfd *abfd
order. */
memcpy (contents, "ZLIB", 4);
bfd_putb64 (sec->size, contents + 4);
+ /* No way to keep the original alignment, just use 1 always. */
+ bfd_set_section_alignment (abfd, sec, 0);
}
}
}
@@ -2368,12 +2374,15 @@ bfd_update_compression_header (bfd *abfd
SYNOPSIS
bfd_boolean bfd_check_compression_header
(bfd *abfd, bfd_byte *contents, asection *sec,
- bfd_size_type *uncompressed_size);
+ bfd_size_type *uncompressed_size,
+ unsigned int *uncompressed_alignment_power);
+
DESCRIPTION
Check the compression header at CONTENTS of SEC in ABFD and
- store the uncompressed size in UNCOMPRESSED_SIZE if the
- compression header is valid.
+ store the uncompressed size in UNCOMPRESSED_SIZE and the
+ uncompressed data alignment in UNCOMPRESSED_ALIGNMENT_POWER
+ if the compression header is valid.
RETURNS
Return TRUE if the compression header is valid.
@@ -2382,7 +2391,8 @@ RETURNS
bfd_boolean
bfd_check_compression_header (bfd *abfd, bfd_byte *contents,
asection *sec,
- bfd_size_type *uncompressed_size)
+ bfd_size_type *uncompressed_size,
+ unsigned int *uncompressed_alignment_power)
{
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
&& (elf_section_flags (sec) & SHF_COMPRESSED) != 0)
@@ -2404,9 +2414,10 @@ bfd_check_compression_header (bfd *abfd,
chdr.ch_addralign = bfd_get_64 (abfd, &echdr->ch_addralign);
}
if (chdr.ch_type == ELFCOMPRESS_ZLIB
- && chdr.ch_addralign == 1U << sec->alignment_power)
+ && chdr.ch_addralign == (1U << bfd_log2 (chdr.ch_addralign)))
{
*uncompressed_size = chdr.ch_size;
+ *uncompressed_alignment_power = bfd_log2 (chdr.ch_addralign);
return TRUE;
}
}
diff -rup binutils.orig/bfd/bfd-in2.h binutils-2.31.1/bfd/bfd-in2.h
--- binutils.orig/bfd/bfd-in2.h 2019-02-18 11:53:32.156652107 +0000
+++ binutils-2.31.1/bfd/bfd-in2.h 2019-02-18 12:00:23.849723903 +0000
@@ -7274,7 +7274,8 @@ void bfd_update_compression_header
bfd_boolean bfd_check_compression_header
(bfd *abfd, bfd_byte *contents, asection *sec,
- bfd_size_type *uncompressed_size);
+ bfd_size_type *uncompressed_size,
+ unsigned int *uncompressed_alignment_power);
int bfd_get_compression_header_size (bfd *abfd, asection *sec);
@@ -7850,7 +7851,8 @@ void bfd_cache_section_contents
bfd_boolean bfd_is_section_compressed_with_header
(bfd *abfd, asection *section,
int *compression_header_size_p,
- bfd_size_type *uncompressed_size_p);
+ bfd_size_type *uncompressed_size_p,
+ unsigned int *uncompressed_alignment_power_p);
bfd_boolean bfd_is_section_compressed
(bfd *abfd, asection *section);
diff -rup binutils.orig/bfd/compress.c binutils-2.31.1/bfd/compress.c
--- binutils.orig/bfd/compress.c 2019-02-18 11:53:32.153652128 +0000
+++ binutils-2.31.1/bfd/compress.c 2019-02-18 12:11:44.899886376 +0000
@@ -84,11 +84,13 @@ bfd_compress_section_contents (bfd *abfd
int zlib_size = 0;
int orig_compression_header_size;
bfd_size_type orig_uncompressed_size;
+ unsigned int orig_uncompressed_alignment_pow;
int header_size = bfd_get_compression_header_size (abfd, NULL);
bfd_boolean compressed
= bfd_is_section_compressed_with_header (abfd, sec,
&orig_compression_header_size,
- &orig_uncompressed_size);
+ &orig_uncompressed_size,
+ &orig_uncompressed_alignment_pow);
/* Either ELF compression header or the 12-byte, "ZLIB" + 8-byte size,
overhead in .zdebug* section. */
@@ -153,6 +155,8 @@ bfd_compress_section_contents (bfd *abfd
return 0;
}
free (uncompressed_buffer);
+ bfd_set_section_alignment (abfd, sec,
+ orig_uncompressed_alignment_pow);
sec->contents = buffer;
sec->compress_status = COMPRESS_SECTION_DONE;
return orig_uncompressed_size;
@@ -364,20 +368,25 @@ SYNOPSIS
bfd_boolean bfd_is_section_compressed_with_header
(bfd *abfd, asection *section,
int *compression_header_size_p,
- bfd_size_type *uncompressed_size_p);
+ bfd_size_type *uncompressed_size_p,
+ unsigned int *uncompressed_alignment_power_p);
+
DESCRIPTION
Return @code{TRUE} if @var{section} is compressed. Compression
- header size is returned in @var{compression_header_size_p} and
- uncompressed size is returned in @var{uncompressed_size_p}. If
- compression is unsupported, compression header size is returned
- with -1 and uncompressed size is returned with 0.
+ header size is returned in @var{compression_header_size_p},
+ uncompressed size is returned in @var{uncompressed_size_p}
+ and the uncompressed data alignement power is returned in
+ @var{uncompressed_align_pow_p}. If compression is
+ unsupported, compression header size is returned with -1
+ and uncompressed size is returned with 0.
*/
bfd_boolean
bfd_is_section_compressed_with_header (bfd *abfd, sec_ptr sec,
int *compression_header_size_p,
- bfd_size_type *uncompressed_size_p)
+ bfd_size_type *uncompressed_size_p,
+ unsigned int *uncompressed_align_pow_p)
{
bfd_byte header[MAX_COMPRESSION_HEADER_SIZE];
int compression_header_size;
@@ -385,6 +394,8 @@ bfd_is_section_compressed_with_header (b
unsigned int saved = sec->compress_status;
bfd_boolean compressed;
+ *uncompressed_align_pow_p = 0;
+
compression_header_size = bfd_get_compression_header_size (abfd, sec);
if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE)
abort ();
@@ -412,7 +423,8 @@ bfd_is_section_compressed_with_header (b
if (compression_header_size != 0)
{
if (!bfd_check_compression_header (abfd, header, sec,
- uncompressed_size_p))
+ uncompressed_size_p,
+ uncompressed_align_pow_p))
compression_header_size = -1;
}
/* Check for the pathalogical case of a debug string section that
@@ -449,9 +461,11 @@ bfd_is_section_compressed (bfd *abfd, se
{
int compression_header_size;
bfd_size_type uncompressed_size;
+ unsigned int uncompressed_align_power;
return (bfd_is_section_compressed_with_header (abfd, sec,
&compression_header_size,
- &uncompressed_size)
+ &uncompressed_size,
+ &uncompressed_align_power)
&& compression_header_size >= 0
&& uncompressed_size > 0);
}
@@ -480,6 +494,7 @@ bfd_init_section_decompress_status (bfd
int compression_header_size;
int header_size;
bfd_size_type uncompressed_size;
+ unsigned int uncompressed_alignment_power = 0;
compression_header_size = bfd_get_compression_header_size (abfd, sec);
if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE)
@@ -508,7 +523,8 @@ bfd_init_section_decompress_status (bfd
uncompressed_size = bfd_getb64 (header + 4);
}
else if (!bfd_check_compression_header (abfd, header, sec,
- &uncompressed_size))
+ &uncompressed_size,
+ &uncompressed_alignment_power))
{
bfd_set_error (bfd_error_wrong_format);
return FALSE;
@@ -516,6 +532,7 @@ bfd_init_section_decompress_status (bfd
sec->compressed_size = sec->size;
sec->size = uncompressed_size;
+ bfd_set_section_alignment (abfd, sec, uncompressed_alignment_power);
sec->compress_status = DECOMPRESS_SECTION_SIZED;
return TRUE;
diff -rup binutils.orig/bfd/elf.c binutils-2.31.1/bfd/elf.c
--- binutils.orig/bfd/elf.c 2019-02-18 11:53:32.161652071 +0000
+++ binutils-2.31.1/bfd/elf.c 2019-02-18 12:08:52.135108638 +0000
@@ -1177,10 +1177,12 @@ _bfd_elf_make_section_from_shdr (bfd *ab
enum { nothing, compress, decompress } action = nothing;
int compression_header_size;
bfd_size_type uncompressed_size;
+ unsigned int uncompressed_align_power;
bfd_boolean compressed
= bfd_is_section_compressed_with_header (abfd, newsect,
&compression_header_size,
- &uncompressed_size);
+ &uncompressed_size,
+ &uncompressed_align_power);
if (compressed)
{
diff -rup binutils.orig/binutils/readelf.c binutils-2.31.1/binutils/readelf.c
--- binutils.orig/binutils/readelf.c 2019-02-18 11:53:32.947646480 +0000
+++ binutils-2.31.1/binutils/readelf.c 2019-02-18 12:10:13.142535034 +0000
@@ -13366,12 +13366,6 @@ dump_section_as_strings (Elf_Internal_Sh
printable_section_name (filedata, section), chdr.ch_type);
return FALSE;
}
- else if (chdr.ch_addralign != section->sh_addralign)
- {
- warn (_("compressed section '%s' is corrupted\n"),
- printable_section_name (filedata, section));
- return FALSE;
- }
uncompressed_size = chdr.ch_size;
start += compression_header_size;
new_size -= compression_header_size;
@@ -13513,12 +13507,6 @@ dump_section_as_bytes (Elf_Internal_Shdr
printable_section_name (filedata, section), chdr.ch_type);
return FALSE;
}
- else if (chdr.ch_addralign != section->sh_addralign)
- {
- warn (_("compressed section '%s' is corrupted\n"),
- printable_section_name (filedata, section));
- return FALSE;
- }
uncompressed_size = chdr.ch_size;
start += compression_header_size;
new_size -= compression_header_size;
@@ -13688,12 +13676,6 @@ load_specific_debug_section (enum dwarf_
section->name, chdr.ch_type);
return FALSE;
}
- else if (chdr.ch_addralign != sec->sh_addralign)
- {
- warn (_("compressed section '%s' is corrupted\n"),
- section->name);
- return FALSE;
- }
uncompressed_size = chdr.ch_size;
start += compression_header_size;
size -= compression_header_size;
diff -rup binutils.orig/binutils/testsuite/binutils-all/dw2-3.rS binutils-2.31.1/binutils/testsuite/binutils-all/dw2-3.rS
--- binutils.orig/binutils/testsuite/binutils-all/dw2-3.rS 2019-02-18 11:53:32.908646758 +0000
+++ binutils-2.31.1/binutils/testsuite/binutils-all/dw2-3.rS 2019-02-18 12:10:40.884338917 +0000
@@ -1,3 +1,3 @@
#...
- +\[[ 0-9]+\] .debug_info +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ [0-9a-f]+ +C +0 +0 +1
+ +\[[ 0-9]+\] .debug_info +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ [0-9a-f]+ +C +0 +0 +(4|8)
#pass
diff -rup binutils.orig/binutils/testsuite/binutils-all/dw2-3.rt binutils-2.31.1/binutils/testsuite/binutils-all/dw2-3.rt
--- binutils.orig/binutils/testsuite/binutils-all/dw2-3.rt 2019-02-18 11:53:32.905646779 +0000
+++ binutils-2.31.1/binutils/testsuite/binutils-all/dw2-3.rt 2019-02-18 12:11:13.476108521 +0000
@@ -1,6 +1,6 @@
#...
+\[[ 0-9]+\] .debug_info
- +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ +[0-9a-f]+ +0 +0 +1
+ +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ +[0-9a-f]+ +0 +0 +(4|8)
+\[0+800\]: COMPRESSED
+ZLIB, 0+9d, 1
#pass
diff -rup binutils.orig/gold/merge.cc binutils-2.31.1/gold/merge.cc
--- binutils.orig/gold/merge.cc 2019-02-18 11:53:32.210651723 +0000
+++ binutils-2.31.1/gold/merge.cc 2019-02-18 12:12:59.027362334 +0000
@@ -440,9 +440,11 @@ Output_merge_string<Char_type>::do_add_i
{
section_size_type sec_len;
bool is_new;
+ uint64_t addralign = this->addralign();
const unsigned char* pdata = object->decompressed_section_contents(shndx,
&sec_len,
- &is_new);
+ &is_new,
+ &addralign);
const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
const Char_type* pend = p + sec_len / sizeof(Char_type);
@@ -494,7 +496,7 @@ Output_merge_string<Char_type>::do_add_i
// aligned, so each string within the section must retain the same
// modulo.
uintptr_t init_align_modulo = (reinterpret_cast<uintptr_t>(pdata)
- & (this->addralign() - 1));
+ & (addralign - 1));
bool has_misaligned_strings = false;
while (p < pend)
@@ -503,7 +505,7 @@ Output_merge_string<Char_type>::do_add_i
// Within merge input section each string must be aligned.
if (len != 0
- && ((reinterpret_cast<uintptr_t>(p) & (this->addralign() - 1))
+ && ((reinterpret_cast<uintptr_t>(p) & (addralign - 1))
!= init_align_modulo))
has_misaligned_strings = true;
diff -rup binutils.orig/gold/object.cc binutils-2.31.1/gold/object.cc
--- binutils.orig/gold/object.cc 2019-02-18 11:53:32.208651737 +0000
+++ binutils-2.31.1/gold/object.cc 2019-02-18 12:16:35.938828914 +0000
@@ -751,11 +751,13 @@ build_compressed_section_map(
const unsigned char* contents =
obj->section_contents(i, &len, false);
uint64_t uncompressed_size;
+ Compressed_section_info info;
if (is_zcompressed)
{
// Skip over the ".zdebug" prefix.
name += 7;
uncompressed_size = get_uncompressed_size(contents, len);
+ info.addralign = shdr.get_sh_addralign();
}
else
{
@@ -763,8 +765,8 @@ build_compressed_section_map(
name += 6;
elfcpp::Chdr<size, big_endian> chdr(contents);
uncompressed_size = chdr.get_ch_size();
+ info.addralign = chdr.get_ch_addralign();
}
- Compressed_section_info info;
info.size = convert_to_section_size_type(uncompressed_size);
info.flag = shdr.get_sh_flags();
info.contents = NULL;
@@ -3060,7 +3062,8 @@ const unsigned char*
Object::decompressed_section_contents(
unsigned int shndx,
section_size_type* plen,
- bool* is_new)
+ bool* is_new,
+ uint64_t* palign)
{
section_size_type buffer_size;
const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size,
@@ -3087,6 +3090,8 @@ Object::decompressed_section_contents(
{
*plen = uncompressed_size;
*is_new = false;
+ if (palign != NULL)
+ *palign = p->second.addralign;
return p->second.contents;
}
@@ -3108,6 +3113,8 @@ Object::decompressed_section_contents(
// once in this pass.
*plen = uncompressed_size;
*is_new = true;
+ if (palign != NULL)
+ *palign = p->second.addralign;
return uncompressed_data;
}
diff -rup binutils.orig/gold/object.h binutils-2.31.1/gold/object.h
--- binutils.orig/gold/object.h 2019-02-18 11:53:32.210651723 +0000
+++ binutils-2.31.1/gold/object.h 2019-02-18 12:17:50.625300926 +0000
@@ -373,6 +373,7 @@ struct Compressed_section_info
{
section_size_type size;
elfcpp::Elf_Xword flag;
+ uint64_t addralign;
const unsigned char* contents;
};
typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map;
@@ -808,7 +809,8 @@ class Object
bool
section_is_compressed(unsigned int shndx,
- section_size_type* uncompressed_size) const
+ section_size_type* uncompressed_size,
+ elfcpp::Elf_Xword* palign = NULL) const
{
if (this->compressed_sections_ == NULL)
return false;
@@ -818,6 +820,8 @@ class Object
{
if (uncompressed_size != NULL)
*uncompressed_size = p->second.size;
+ if (palign != NULL)
+ *palign = p->second.addralign;
return true;
}
return false;
@@ -828,7 +832,7 @@ class Object
// by the caller.
const unsigned char*
decompressed_section_contents(unsigned int shndx, section_size_type* plen,
- bool* is_cached);
+ bool* is_cached, uint64_t* palign = NULL);
// Discard any buffers of decompressed sections. This is done
// at the end of the Add_symbols task.
diff -rup binutils.orig/gold/output.cc binutils-2.31.1/gold/output.cc
--- binutils.orig/gold/output.cc 2019-02-18 11:53:32.209651729 +0000
+++ binutils-2.31.1/gold/output.cc 2019-02-18 12:18:39.729953797 +0000
@@ -2448,7 +2448,14 @@ Output_section::add_input_section(Layout
unsigned int reloc_shndx,
bool have_sections_script)
{
+ section_size_type input_section_size = shdr.get_sh_size();
+ section_size_type uncompressed_size;
elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
+
+ if (object->section_is_compressed(shndx, &uncompressed_size,
+ &addralign))
+ input_section_size = uncompressed_size;
+
if ((addralign & (addralign - 1)) != 0)
{
object->error(_("invalid alignment %lu for section \"%s\""),
@@ -2498,11 +2505,6 @@ Output_section::add_input_section(Layout
}
}
- section_size_type input_section_size = shdr.get_sh_size();
- section_size_type uncompressed_size;
- if (object->section_is_compressed(shndx, &uncompressed_size))
- input_section_size = uncompressed_size;
-
off_t offset_in_section;
if (this->has_fixed_layout())

10
binutils.spec
View File

@ -69,7 +69,7 @@
Summary: A GNU collection of binary utilities
Name: %{?cross}binutils%{?_with_debug:-debug}
Version: 2.31.1
Release: 17%{?dist}
Release: 18%{?dist}
License: GPLv3+
URL: https://sourceware.org/binutils
@ -199,6 +199,10 @@ Patch19: binutils-CVE-2018-20002.patch
# Lifetime: Fixed in 2.32
Patch20: binutils-gas-input-matches-output.patch
# Purpose: Ensure that decompressed sections have the correct alignment.
# Lifetime: Fixed in 2.32
Patch21: binutils-alignment-of-decompressed-sections.patch
#----------------------------------------------------------------------------
Provides: bundled(libiberty)
@ -342,6 +346,7 @@ using libelf instead of BFD.
%patch18 -p1
%patch19 -p1
%patch20 -p1
%patch21 -p1
# We cannot run autotools as there is an exact requirement of autoconf-2.59.
@ -749,6 +754,9 @@ exit 0
#----------------------------------------------------------------------------
%changelog
* Mon Feb 18 2019 Nick Clifton <nickc@redhat.com> - 2.31.1-18
- Ensure that decompressed sections have the correct alignment. (#1678204)
* Wed Jan 30 2019 Nick Clifton <nickc@redhat.com> - 2.31.1-17
- Fix the assembler's check that the output file is not also one of the input files. (#1660279)