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c5967f38de
Investigating the PR28530 testcase, which has a fuzzed compression header with an enormous size, I noticed that decompress_contents is broken when the size doesn't fit in strm.avail_out. It wouldn't be too hard to support larger sizes (patches welcome!) but for now just stop decompress_contents from returning rubbish. PR 28530 * compress.c (decompress_contents): Fail when uncompressed_size is too big. (bfd_init_section_decompress_status): Likewise.
664 lines
19 KiB
C
664 lines
19 KiB
C
/* Compressed section support (intended for debug sections).
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Copyright (C) 2008-2021 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include <zlib.h>
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#include "bfd.h"
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#include "libbfd.h"
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#include "safe-ctype.h"
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#define MAX_COMPRESSION_HEADER_SIZE 24
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static bool
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decompress_contents (bfd_byte *compressed_buffer,
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bfd_size_type compressed_size,
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bfd_byte *uncompressed_buffer,
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bfd_size_type uncompressed_size)
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{
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z_stream strm;
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int rc;
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/* It is possible the section consists of several compressed
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buffers concatenated together, so we uncompress in a loop. */
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/* PR 18313: The state field in the z_stream structure is supposed
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to be invisible to the user (ie us), but some compilers will
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still complain about it being used without initialisation. So
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we first zero the entire z_stream structure and then set the fields
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that we need. */
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memset (& strm, 0, sizeof strm);
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strm.avail_in = compressed_size;
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strm.next_in = (Bytef*) compressed_buffer;
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strm.avail_out = uncompressed_size;
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/* FIXME: strm.avail_in and strm.avail_out are typically unsigned
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int. Supporting sizes that don't fit in an unsigned int is
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possible but will require some rewriting of this function. */
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if (strm.avail_in != compressed_size || strm.avail_out != uncompressed_size)
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return false;
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BFD_ASSERT (Z_OK == 0);
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rc = inflateInit (&strm);
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while (strm.avail_in > 0 && strm.avail_out > 0)
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{
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if (rc != Z_OK)
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break;
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strm.next_out = ((Bytef*) uncompressed_buffer
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+ (uncompressed_size - strm.avail_out));
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rc = inflate (&strm, Z_FINISH);
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if (rc != Z_STREAM_END)
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break;
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rc = inflateReset (&strm);
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}
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return inflateEnd (&strm) == Z_OK && rc == Z_OK && strm.avail_out == 0;
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}
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/* Compress data of the size specified in @var{uncompressed_size}
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and pointed to by @var{uncompressed_buffer} using zlib and store
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as the contents field. This function assumes the contents
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field was allocated using bfd_malloc() or equivalent.
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Return the uncompressed size if the full section contents is
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compressed successfully. Otherwise return 0. */
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static bfd_size_type
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bfd_compress_section_contents (bfd *abfd, sec_ptr sec,
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bfd_byte *uncompressed_buffer,
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bfd_size_type uncompressed_size)
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{
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uLong compressed_size;
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bfd_byte *buffer;
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bfd_size_type buffer_size;
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bool decompress;
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int zlib_size = 0;
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int orig_compression_header_size;
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bfd_size_type orig_uncompressed_size;
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unsigned int orig_uncompressed_alignment_pow;
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int header_size = bfd_get_compression_header_size (abfd, NULL);
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bool compressed
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= bfd_is_section_compressed_with_header (abfd, sec,
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&orig_compression_header_size,
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&orig_uncompressed_size,
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&orig_uncompressed_alignment_pow);
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/* Either ELF compression header or the 12-byte, "ZLIB" + 8-byte size,
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overhead in .zdebug* section. */
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if (!header_size)
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header_size = 12;
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if (compressed)
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{
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/* We shouldn't decompress unsupported compressed section. */
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if (orig_compression_header_size < 0)
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abort ();
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/* Different compression schemes. Just move the compressed section
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contents to the right position. */
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if (orig_compression_header_size == 0)
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{
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/* Convert it from .zdebug* section. Get the uncompressed
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size first. We need to subtract the 12-byte overhead in
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.zdebug* section. Set orig_compression_header_size to
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the 12-bye overhead. */
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orig_compression_header_size = 12;
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zlib_size = uncompressed_size - 12;
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}
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else
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{
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/* Convert it to .zdebug* section. */
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zlib_size = uncompressed_size - orig_compression_header_size;
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}
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/* Add the header size. */
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compressed_size = zlib_size + header_size;
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}
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else
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compressed_size = compressBound (uncompressed_size) + header_size;
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/* Uncompress if it leads to smaller size. */
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if (compressed && compressed_size > orig_uncompressed_size)
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{
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decompress = true;
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buffer_size = orig_uncompressed_size;
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}
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else
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{
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decompress = false;
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buffer_size = compressed_size;
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}
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buffer = (bfd_byte *) bfd_alloc (abfd, buffer_size);
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if (buffer == NULL)
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return 0;
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if (compressed)
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{
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sec->size = orig_uncompressed_size;
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if (decompress)
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{
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if (!decompress_contents (uncompressed_buffer
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+ orig_compression_header_size,
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zlib_size, buffer, buffer_size))
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{
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bfd_set_error (bfd_error_bad_value);
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bfd_release (abfd, buffer);
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return 0;
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}
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free (uncompressed_buffer);
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bfd_set_section_alignment (sec, orig_uncompressed_alignment_pow);
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sec->contents = buffer;
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sec->compress_status = COMPRESS_SECTION_DONE;
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return orig_uncompressed_size;
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}
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else
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{
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bfd_update_compression_header (abfd, buffer, sec);
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memmove (buffer + header_size,
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uncompressed_buffer + orig_compression_header_size,
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zlib_size);
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}
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}
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else
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{
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if (compress ((Bytef*) buffer + header_size,
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&compressed_size,
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(const Bytef*) uncompressed_buffer,
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uncompressed_size) != Z_OK)
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{
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bfd_release (abfd, buffer);
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bfd_set_error (bfd_error_bad_value);
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return 0;
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}
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compressed_size += header_size;
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/* PR binutils/18087: If compression didn't make the section smaller,
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just keep it uncompressed. */
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if (compressed_size < uncompressed_size)
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bfd_update_compression_header (abfd, buffer, sec);
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else
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{
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/* NOTE: There is a small memory leak here since
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uncompressed_buffer is malloced and won't be freed. */
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bfd_release (abfd, buffer);
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sec->contents = uncompressed_buffer;
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sec->compress_status = COMPRESS_SECTION_NONE;
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return uncompressed_size;
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}
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}
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free (uncompressed_buffer);
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sec->contents = buffer;
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sec->size = compressed_size;
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sec->compress_status = COMPRESS_SECTION_DONE;
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return uncompressed_size;
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}
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/*
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FUNCTION
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bfd_get_full_section_contents
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SYNOPSIS
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bool bfd_get_full_section_contents
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(bfd *abfd, asection *section, bfd_byte **ptr);
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DESCRIPTION
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Read all data from @var{section} in BFD @var{abfd}, decompress
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if needed, and store in @var{*ptr}. If @var{*ptr} is NULL,
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return @var{*ptr} with memory malloc'd by this function.
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Return @code{TRUE} if the full section contents is retrieved
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successfully. If the section has no contents then this function
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returns @code{TRUE} but @var{*ptr} is set to NULL.
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*/
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bool
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bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
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{
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bfd_size_type sz;
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bfd_byte *p = *ptr;
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bool ret;
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bfd_size_type save_size;
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bfd_size_type save_rawsize;
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bfd_byte *compressed_buffer;
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unsigned int compression_header_size;
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if (abfd->direction != write_direction && sec->rawsize != 0)
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sz = sec->rawsize;
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else
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sz = sec->size;
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if (sz == 0)
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{
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*ptr = NULL;
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return true;
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}
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switch (sec->compress_status)
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{
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case COMPRESS_SECTION_NONE:
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if (p == NULL)
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{
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ufile_ptr filesize = bfd_get_file_size (abfd);
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if (filesize > 0
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&& filesize < sz
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/* PR 24753: Linker created sections can be larger than
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the file size, eg if they are being used to hold stubs. */
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&& (bfd_section_flags (sec) & SEC_LINKER_CREATED) == 0
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/* PR 24753: Sections which have no content should also be
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excluded as they contain no size on disk. */
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&& (bfd_section_flags (sec) & SEC_HAS_CONTENTS) != 0
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/* The MMO file format supports its own special compression
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technique, but it uses COMPRESS_SECTION_NONE when loading
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a section's contents. */
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&& bfd_get_flavour (abfd) != bfd_target_mmo_flavour)
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{
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/* PR 24708: Avoid attempts to allocate a ridiculous amount
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of memory. */
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bfd_set_error (bfd_error_file_truncated);
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_bfd_error_handler
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/* xgettext:c-format */
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(_("error: %pB(%pA) section size (%#" PRIx64 " bytes) is larger than file size (%#" PRIx64 " bytes)"),
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abfd, sec, (uint64_t) sz, (uint64_t) filesize);
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return false;
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}
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p = (bfd_byte *) bfd_malloc (sz);
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if (p == NULL)
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{
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/* PR 20801: Provide a more helpful error message. */
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if (bfd_get_error () == bfd_error_no_memory)
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_bfd_error_handler
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/* xgettext:c-format */
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(_("error: %pB(%pA) is too large (%#" PRIx64 " bytes)"),
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abfd, sec, (uint64_t) sz);
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return false;
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}
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}
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if (!bfd_get_section_contents (abfd, sec, p, 0, sz))
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{
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if (*ptr != p)
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free (p);
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return false;
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}
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*ptr = p;
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return true;
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case DECOMPRESS_SECTION_SIZED:
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/* Read in the full compressed section contents. */
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compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size);
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if (compressed_buffer == NULL)
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return false;
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save_rawsize = sec->rawsize;
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save_size = sec->size;
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/* Clear rawsize, set size to compressed size and set compress_status
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to COMPRESS_SECTION_NONE. If the compressed size is bigger than
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the uncompressed size, bfd_get_section_contents will fail. */
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sec->rawsize = 0;
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sec->size = sec->compressed_size;
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sec->compress_status = COMPRESS_SECTION_NONE;
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ret = bfd_get_section_contents (abfd, sec, compressed_buffer,
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0, sec->compressed_size);
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/* Restore rawsize and size. */
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sec->rawsize = save_rawsize;
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sec->size = save_size;
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sec->compress_status = DECOMPRESS_SECTION_SIZED;
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if (!ret)
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goto fail_compressed;
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if (p == NULL)
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p = (bfd_byte *) bfd_malloc (sz);
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if (p == NULL)
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goto fail_compressed;
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compression_header_size = bfd_get_compression_header_size (abfd, sec);
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if (compression_header_size == 0)
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/* Set header size to the zlib header size if it is a
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SHF_COMPRESSED section. */
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compression_header_size = 12;
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if (!decompress_contents (compressed_buffer + compression_header_size,
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sec->compressed_size - compression_header_size, p, sz))
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{
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bfd_set_error (bfd_error_bad_value);
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if (p != *ptr)
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free (p);
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fail_compressed:
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free (compressed_buffer);
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return false;
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}
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free (compressed_buffer);
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*ptr = p;
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return true;
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case COMPRESS_SECTION_DONE:
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if (sec->contents == NULL)
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return false;
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if (p == NULL)
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{
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p = (bfd_byte *) bfd_malloc (sz);
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if (p == NULL)
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return false;
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*ptr = p;
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}
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/* PR 17512; file: 5bc29788. */
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if (p != sec->contents)
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memcpy (p, sec->contents, sz);
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return true;
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default:
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abort ();
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}
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}
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/*
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FUNCTION
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bfd_cache_section_contents
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SYNOPSIS
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void bfd_cache_section_contents
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(asection *sec, void *contents);
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DESCRIPTION
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Stash @var(contents) so any following reads of @var(sec) do
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not need to decompress again.
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*/
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void
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bfd_cache_section_contents (asection *sec, void *contents)
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{
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if (sec->compress_status == DECOMPRESS_SECTION_SIZED)
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sec->compress_status = COMPRESS_SECTION_DONE;
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sec->contents = contents;
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sec->flags |= SEC_IN_MEMORY;
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}
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/*
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FUNCTION
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bfd_is_section_compressed_with_header
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SYNOPSIS
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bool bfd_is_section_compressed_with_header
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(bfd *abfd, asection *section,
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int *compression_header_size_p,
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bfd_size_type *uncompressed_size_p,
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unsigned int *uncompressed_alignment_power_p);
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DESCRIPTION
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Return @code{TRUE} if @var{section} is compressed. Compression
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header size is returned in @var{compression_header_size_p},
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uncompressed size is returned in @var{uncompressed_size_p}
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and the uncompressed data alignement power is returned in
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@var{uncompressed_align_pow_p}. If compression is
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unsupported, compression header size is returned with -1
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and uncompressed size is returned with 0.
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*/
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bool
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bfd_is_section_compressed_with_header (bfd *abfd, sec_ptr sec,
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int *compression_header_size_p,
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bfd_size_type *uncompressed_size_p,
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unsigned int *uncompressed_align_pow_p)
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{
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bfd_byte header[MAX_COMPRESSION_HEADER_SIZE];
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int compression_header_size;
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int header_size;
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unsigned int saved = sec->compress_status;
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bool compressed;
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*uncompressed_align_pow_p = 0;
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compression_header_size = bfd_get_compression_header_size (abfd, sec);
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if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE)
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abort ();
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header_size = compression_header_size ? compression_header_size : 12;
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/* Don't decompress the section. */
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sec->compress_status = COMPRESS_SECTION_NONE;
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/* Read the header. */
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if (bfd_get_section_contents (abfd, sec, header, 0, header_size))
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{
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if (compression_header_size == 0)
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/* In this case, it should be "ZLIB" followed by the uncompressed
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section size, 8 bytes in big-endian order. */
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compressed = startswith ((char*) header , "ZLIB");
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else
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compressed = true;
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}
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else
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compressed = false;
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*uncompressed_size_p = sec->size;
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if (compressed)
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{
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if (compression_header_size != 0)
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{
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if (!bfd_check_compression_header (abfd, header, sec,
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uncompressed_size_p,
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uncompressed_align_pow_p))
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compression_header_size = -1;
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}
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/* Check for the pathalogical case of a debug string section that
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contains the string ZLIB.... as the first entry. We assume that
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no uncompressed .debug_str section would ever be big enough to
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have the first byte of its (big-endian) size be non-zero. */
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else if (strcmp (sec->name, ".debug_str") == 0
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&& ISPRINT (header[4]))
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compressed = false;
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else
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*uncompressed_size_p = bfd_getb64 (header + 4);
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}
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/* Restore compress_status. */
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sec->compress_status = saved;
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*compression_header_size_p = compression_header_size;
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return compressed;
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}
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/*
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FUNCTION
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bfd_is_section_compressed
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SYNOPSIS
|
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bool bfd_is_section_compressed
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(bfd *abfd, asection *section);
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|
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DESCRIPTION
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Return @code{TRUE} if @var{section} is compressed.
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*/
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bool
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bfd_is_section_compressed (bfd *abfd, sec_ptr sec)
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{
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int compression_header_size;
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bfd_size_type uncompressed_size;
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unsigned int uncompressed_align_power;
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return (bfd_is_section_compressed_with_header (abfd, sec,
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&compression_header_size,
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&uncompressed_size,
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&uncompressed_align_power)
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&& compression_header_size >= 0
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&& uncompressed_size > 0);
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}
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/*
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FUNCTION
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bfd_init_section_decompress_status
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SYNOPSIS
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bool bfd_init_section_decompress_status
|
|
(bfd *abfd, asection *section);
|
|
|
|
DESCRIPTION
|
|
Record compressed section size, update section size with
|
|
decompressed size and set compress_status to
|
|
DECOMPRESS_SECTION_SIZED.
|
|
|
|
Return @code{FALSE} if the section is not a valid compressed
|
|
section. Otherwise, return @code{TRUE}.
|
|
*/
|
|
|
|
bool
|
|
bfd_init_section_decompress_status (bfd *abfd, sec_ptr sec)
|
|
{
|
|
bfd_byte header[MAX_COMPRESSION_HEADER_SIZE];
|
|
int compression_header_size;
|
|
int header_size;
|
|
bfd_size_type uncompressed_size;
|
|
unsigned int uncompressed_alignment_power = 0;
|
|
z_stream strm;
|
|
|
|
compression_header_size = bfd_get_compression_header_size (abfd, sec);
|
|
if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE)
|
|
abort ();
|
|
header_size = compression_header_size ? compression_header_size : 12;
|
|
|
|
/* Read the header. */
|
|
if (sec->rawsize != 0
|
|
|| sec->contents != NULL
|
|
|| sec->compress_status != COMPRESS_SECTION_NONE
|
|
|| !bfd_get_section_contents (abfd, sec, header, 0, header_size))
|
|
{
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return false;
|
|
}
|
|
|
|
if (compression_header_size == 0)
|
|
{
|
|
/* In this case, it should be "ZLIB" followed by the uncompressed
|
|
section size, 8 bytes in big-endian order. */
|
|
if (! startswith ((char*) header, "ZLIB"))
|
|
{
|
|
bfd_set_error (bfd_error_wrong_format);
|
|
return false;
|
|
}
|
|
uncompressed_size = bfd_getb64 (header + 4);
|
|
}
|
|
else if (!bfd_check_compression_header (abfd, header, sec,
|
|
&uncompressed_size,
|
|
&uncompressed_alignment_power))
|
|
{
|
|
bfd_set_error (bfd_error_wrong_format);
|
|
return false;
|
|
}
|
|
|
|
/* PR28530, reject sizes unsupported by decompress_contents. */
|
|
strm.avail_in = sec->size;
|
|
strm.avail_out = uncompressed_size;
|
|
if (strm.avail_in != sec->size || strm.avail_out != uncompressed_size)
|
|
{
|
|
bfd_set_error (bfd_error_nonrepresentable_section);
|
|
return false;
|
|
}
|
|
|
|
sec->compressed_size = sec->size;
|
|
sec->size = uncompressed_size;
|
|
bfd_set_section_alignment (sec, uncompressed_alignment_power);
|
|
sec->compress_status = DECOMPRESS_SECTION_SIZED;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_init_section_compress_status
|
|
|
|
SYNOPSIS
|
|
bool bfd_init_section_compress_status
|
|
(bfd *abfd, asection *section);
|
|
|
|
DESCRIPTION
|
|
If open for read, compress section, update section size with
|
|
compressed size and set compress_status to COMPRESS_SECTION_DONE.
|
|
|
|
Return @code{FALSE} if the section is not a valid compressed
|
|
section. Otherwise, return @code{TRUE}.
|
|
*/
|
|
|
|
bool
|
|
bfd_init_section_compress_status (bfd *abfd, sec_ptr sec)
|
|
{
|
|
bfd_size_type uncompressed_size;
|
|
bfd_byte *uncompressed_buffer;
|
|
|
|
/* Error if not opened for read. */
|
|
if (abfd->direction != read_direction
|
|
|| sec->size == 0
|
|
|| sec->rawsize != 0
|
|
|| sec->contents != NULL
|
|
|| sec->compress_status != COMPRESS_SECTION_NONE)
|
|
{
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return false;
|
|
}
|
|
|
|
/* Read in the full section contents and compress it. */
|
|
uncompressed_size = sec->size;
|
|
uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
|
|
/* PR 21431 */
|
|
if (uncompressed_buffer == NULL)
|
|
return false;
|
|
|
|
if (!bfd_get_section_contents (abfd, sec, uncompressed_buffer,
|
|
0, uncompressed_size))
|
|
return false;
|
|
|
|
uncompressed_size = bfd_compress_section_contents (abfd, sec,
|
|
uncompressed_buffer,
|
|
uncompressed_size);
|
|
return uncompressed_size != 0;
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_compress_section
|
|
|
|
SYNOPSIS
|
|
bool bfd_compress_section
|
|
(bfd *abfd, asection *section, bfd_byte *uncompressed_buffer);
|
|
|
|
DESCRIPTION
|
|
If open for write, compress section, update section size with
|
|
compressed size and set compress_status to COMPRESS_SECTION_DONE.
|
|
|
|
Return @code{FALSE} if compression fail. Otherwise, return
|
|
@code{TRUE}.
|
|
*/
|
|
|
|
bool
|
|
bfd_compress_section (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer)
|
|
{
|
|
bfd_size_type uncompressed_size = sec->size;
|
|
|
|
/* Error if not opened for write. */
|
|
if (abfd->direction != write_direction
|
|
|| uncompressed_size == 0
|
|
|| uncompressed_buffer == NULL
|
|
|| sec->contents != NULL
|
|
|| sec->compressed_size != 0
|
|
|| sec->compress_status != COMPRESS_SECTION_NONE)
|
|
{
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return false;
|
|
}
|
|
|
|
/* Compress it. */
|
|
return bfd_compress_section_contents (abfd, sec, uncompressed_buffer,
|
|
uncompressed_size) != 0;
|
|
}
|