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Limit bogus archive parsed_size

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Archive element size is given by data in the archive, and thus is
subject to attack by fuzzers.  The only harm this allows is allocation
of huge amounts of memory, but some systems don't handle that well.
So limit archive element size to archive file size.

	* bfdio.c (bfd_get_file_size): Ignore bogus archive element sizes.
This commit is contained in:
Alan Modra 2020-02-25 12:48:43 +10:30
parent 24a15046c0
commit b570b954bc
2 changed files with 20 additions and 2 deletions
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4
bfd/ChangeLog
View File

@ -1,3 +1,7 @@
2020-02-26 Alan Modra <amodra@gmail.com>
* bfdio.c (bfd_get_file_size): Ignore bogus archive element sizes.
2020-02-25 H.J. Lu <hongjiu.lu@intel.com>
PR binutils/25584

18
bfd/bfdio.c
View File

@ -25,6 +25,7 @@
#include <limits.h>
#include "bfd.h"
#include "libbfd.h"
#include "aout/ar.h"
#ifndef S_IXUSR
#define S_IXUSR 0100 /* Execute by owner. */
@ -460,11 +461,24 @@ DESCRIPTION
ufile_ptr
bfd_get_file_size (bfd *abfd)
{
ufile_ptr file_size, archive_size = (ufile_ptr) -1;
if (abfd->my_archive != NULL
&& !bfd_is_thin_archive (abfd->my_archive))
return arelt_size (abfd);
{
struct areltdata *adata = (struct areltdata *) abfd->arelt_data;
archive_size = adata->parsed_size;
/* If the archive is compressed we can't compare against file size. */
if (memcmp (((struct ar_hdr *) adata->arch_header)->ar_fmag,
"Z\012", 2) == 0)
return archive_size;
abfd = abfd->my_archive;
}
return bfd_get_size (abfd);
file_size = bfd_get_size (abfd);
if (archive_size < file_size)
return archive_size;
return file_size;
}
/*