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authorNick Clifton <nickc@redhat.com>2005-07-05 11:43:55 +0000
committerNick Clifton <nickc@redhat.com>2005-07-05 11:43:55 +0000
commit0680331375436d4dd60428de66591153a84550bd (patch)
tree1d86d30a12937911fdf75d41fb9406fcd7e1d15c /binutils/strings.c
parent9e492e0549e478e80696ee1e1c5f3ca82b36c666 (diff)
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Add check to avoid corrupt input files whose section sizes are greater than
the size of the input file.
Diffstat (limited to 'binutils/strings.c')
-rw-r--r--binutils/strings.c83
1 files changed, 66 insertions, 17 deletions
diff --git a/binutils/strings.c b/binutils/strings.c
index fda63bd..bdfca226 100644
--- a/binutils/strings.c
+++ b/binutils/strings.c
@@ -1,6 +1,6 @@
/* strings -- print the strings of printable characters in files
Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
- 2002, 2003, 2004 Free Software Foundation, Inc.
+ 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -151,6 +151,15 @@ static struct option long_options[] =
{NULL, 0, NULL, 0}
};
+/* Records the size of a named file so that we
+ do not repeatedly run bfd_stat() on it. */
+
+typedef struct
+{
+ const char * filename;
+ bfd_size_type filesize;
+} filename_and_size_t;
+
static void strings_a_section (bfd *, asection *, void *);
static bfd_boolean strings_object_file (const char *);
static bfd_boolean strings_file (char *file);
@@ -314,27 +323,62 @@ main (int argc, char **argv)
return (exit_status);
}
-/* Scan section SECT of the file ABFD, whose printable name is FILE.
- If it contains initialized data,
- set `got_a_section' and print the strings in it. */
+/* Scan section SECT of the file ABFD, whose printable name is in
+ ARG->filename and whose size might be in ARG->filesize. If it
+ contains initialized data set `got_a_section' and print the
+ strings in it.
+
+ FIXME: We ought to be able to return error codes/messages for
+ certain conditions. */
static void
-strings_a_section (bfd *abfd, asection *sect, void *filearg)
+strings_a_section (bfd *abfd, asection *sect, void *arg)
{
- const char *file = (const char *) filearg;
+ filename_and_size_t * filename_and_sizep;
+ bfd_size_type *filesizep;
+ bfd_size_type sectsize;
+ void *mem;
+
+ if ((sect->flags & DATA_FLAGS) != DATA_FLAGS)
+ return;
+
+ sectsize = bfd_get_section_size (sect);
+
+ if (sectsize <= 0)
+ return;
+
+ /* Get the size of the file. This might have been cached for us. */
+ filename_and_sizep = (filename_and_size_t *) arg;
+ filesizep = & filename_and_sizep->filesize;
+
+ if (*filesizep == 0)
+ {
+ struct stat st;
+
+ if (bfd_stat (abfd, &st))
+ return;
+
+ /* Cache the result so that we do not repeatedly stat this file. */
+ *filesizep = st.st_size;
+ }
- if ((sect->flags & DATA_FLAGS) == DATA_FLAGS)
+ /* Compare the size of the section against the size of the file.
+ If the section is bigger then the file must be corrupt and
+ we should not try dumping it. */
+ if (sectsize >= *filesizep)
+ return;
+
+ mem = xmalloc (sectsize);
+
+ if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sectsize))
{
- bfd_size_type sz = bfd_get_section_size (sect);
- void *mem = xmalloc (sz);
+ got_a_section = TRUE;
- if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sz))
- {
- got_a_section = TRUE;
- print_strings (file, (FILE *) NULL, sect->filepos, 0, sz, mem);
- }
- free (mem);
+ print_strings (filename_and_sizep->filename, NULL, sect->filepos,
+ 0, sectsize, mem);
}
+
+ free (mem);
}
/* Scan all of the sections in FILE, and print the strings
@@ -346,7 +390,10 @@ strings_a_section (bfd *abfd, asection *sect, void *filearg)
static bfd_boolean
strings_object_file (const char *file)
{
- bfd *abfd = bfd_openr (file, target);
+ filename_and_size_t filename_and_size;
+ bfd *abfd;
+
+ abfd = bfd_openr (file, target);
if (abfd == NULL)
/* Treat the file as a non-object file. */
@@ -362,7 +409,9 @@ strings_object_file (const char *file)
}
got_a_section = FALSE;
- bfd_map_over_sections (abfd, strings_a_section, (void *) file);
+ filename_and_size.filename = file;
+ filename_and_size.filesize = 0;
+ bfd_map_over_sections (abfd, strings_a_section, & filename_and_size);
if (!bfd_close (abfd))
{