[PATCH 1/3] binutils: Use file descriptors from make_tempname
Siddhesh Poyarekar
siddhesh@gotplt.org
Thu Dec 3 14:40:55 GMT 2020
The purpose of creating a temporary file securely using mkstemp is
defeated if it is closed in make_tempname and reopened later for use;
it is as good as using mktemp. Get the file descriptor instead and
then use it to create the BFD object.
bfd/
* opncls.c (bfd_fdopenw): New function.
* bfd-in2.h: Regenerate.
binutils/
* bucomm.c (make_tempname): Add argument to return file
descriptor.
* bucomm.h (make_tempname): Likewise.
* ar.c: Include libbfd.h.
(write_archive): Adjust for change in make_tempname. Call
bfd_fdopenw instead of bfd_openw.
* objcopy.c: Include libbfd.h.
(copy_file): New argument OFD. Use bfd_fdopenw instead of
bfd_openw.
(strip_main): Adjust for change in make_tempname and
copy_file.
(copy_main): Likewise.
---
bfd/bfd-in2.h | 2 ++
bfd/opncls.c | 33 +++++++++++++++++++++++++++++++++
binutils/ar.c | 11 ++++++++---
binutils/bucomm.c | 4 ++--
binutils/bucomm.h | 2 +-
binutils/objcopy.c | 30 ++++++++++++++++++++++--------
6 files changed, 68 insertions(+), 14 deletions(-)
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 935ba535b54..48e3d9b6647 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -588,6 +588,8 @@ bfd *bfd_openr (const char *filename, const char *target);
bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
+bfd *bfd_fdopenw (const char *filename, const char *target, int fd);
+
bfd *bfd_openstreamr (const char * filename, const char * target,
void * stream);
diff --git a/bfd/opncls.c b/bfd/opncls.c
index c2a1d2fa4df..f7696b658ca 100644
--- a/bfd/opncls.c
+++ b/bfd/opncls.c
@@ -393,6 +393,39 @@ bfd_fdopenr (const char *filename, const char *target, int fd)
return bfd_fopen (filename, target, mode, fd);
}
+/*
+FUNCTION
+ bfd_fdopenw
+
+SYNOPSIS
+ bfd *bfd_fdopenw (const char *filename, const char *target, int fd);
+
+DESCRIPTION
+ <<bfd_fdopenw>> is exactly like <<bfd_fdopenr>> with the exception that
+ the resulting BFD is suitable for output.
+*/
+
+bfd *
+bfd_fdopenw (const char *filename, const char *target, int fd)
+{
+ bfd *out = bfd_fdopenr (filename, target, fd);
+
+ if (out != NULL)
+ {
+ if (!bfd_write_p (out))
+ {
+ close (fd);
+ _bfd_delete_bfd (out);
+ out = NULL;
+ bfd_set_error (bfd_error_invalid_operation);
+ }
+ else
+ out->direction = write_direction;
+ }
+
+ return out;
+}
+
/*
FUNCTION
bfd_openstreamr
diff --git a/binutils/ar.c b/binutils/ar.c
index 7d279d6722a..225324208bd 100644
--- a/binutils/ar.c
+++ b/binutils/ar.c
@@ -25,6 +25,7 @@
#include "sysdep.h"
#include "bfd.h"
+#include "libbfd.h"
#include "libiberty.h"
#include "progress.h"
#include "getopt.h"
@@ -1252,20 +1253,24 @@ write_archive (bfd *iarch)
bfd *obfd;
char *old_name, *new_name;
bfd *contents_head = iarch->archive_next;
+ int ofd = -1;
old_name = (char *) xmalloc (strlen (bfd_get_filename (iarch)) + 1);
strcpy (old_name, bfd_get_filename (iarch));
- new_name = make_tempname (old_name);
+ new_name = make_tempname (old_name, &ofd);
if (new_name == NULL)
bfd_fatal (_("could not create temporary file whilst writing archive"));
output_filename = new_name;
- obfd = bfd_openw (new_name, bfd_get_target (iarch));
+ obfd = bfd_fdopenw (new_name, bfd_get_target (iarch), ofd);
if (obfd == NULL)
- bfd_fatal (old_name);
+ {
+ close (ofd);
+ bfd_fatal (old_name);
+ }
output_bfd = obfd;
diff --git a/binutils/bucomm.c b/binutils/bucomm.c
index 9e6a02843e6..53244201f89 100644
--- a/binutils/bucomm.c
+++ b/binutils/bucomm.c
@@ -532,7 +532,7 @@ template_in_dir (const char *path)
as FILENAME. */
char *
-make_tempname (const char *filename)
+make_tempname (const char *filename, int *ofd)
{
char *tmpname = template_in_dir (filename);
int fd;
@@ -550,7 +550,7 @@ make_tempname (const char *filename)
free (tmpname);
return NULL;
}
- close (fd);
+ *ofd = fd;
return tmpname;
}
diff --git a/binutils/bucomm.h b/binutils/bucomm.h
index d8318343f78..afb8e09c2fd 100644
--- a/binutils/bucomm.h
+++ b/binutils/bucomm.h
@@ -51,7 +51,7 @@ int display_info (void);
void print_arelt_descr (FILE *, bfd *, bfd_boolean, bfd_boolean);
-char *make_tempname (const char *);
+char *make_tempname (const char *, int *);
char *make_tempdir (const char *);
bfd_vma parse_vma (const char *, const char *);
diff --git a/binutils/objcopy.c b/binutils/objcopy.c
index ca35df03b66..2eb083c3769 100644
--- a/binutils/objcopy.c
+++ b/binutils/objcopy.c
@@ -20,6 +20,7 @@
#include "sysdep.h"
#include "bfd.h"
+#include "libbfd.h"
#include "progress.h"
#include "getopt.h"
#include "libiberty.h"
@@ -3727,7 +3728,7 @@ set_long_section_mode (bfd *output_bfd, bfd *input_bfd, enum long_section_name_h
/* The top-level control. */
static void
-copy_file (const char *input_filename, const char *output_filename,
+copy_file (const char *input_filename, const char *output_filename, int ofd,
const char *input_target, const char *output_target,
const bfd_arch_info_type *input_arch)
{
@@ -3802,9 +3803,14 @@ copy_file (const char *input_filename, const char *output_filename,
else
force_output_target = TRUE;
- obfd = bfd_openw (output_filename, output_target);
+ if (ofd >= 0)
+ obfd = bfd_fdopenw (output_filename, output_target, ofd);
+ else
+ obfd = bfd_openw (output_filename, output_target);
+
if (obfd == NULL)
{
+ close (ofd);
bfd_nonfatal_message (output_filename, NULL, NULL, NULL);
status = 1;
return;
@@ -3832,13 +3838,19 @@ copy_file (const char *input_filename, const char *output_filename,
if (output_target == NULL)
output_target = bfd_get_target (ibfd);
- obfd = bfd_openw (output_filename, output_target);
+ if (ofd >= 0)
+ obfd = bfd_fdopenw (output_filename, output_target, ofd);
+ else
+ obfd = bfd_openw (output_filename, output_target);
+
if (obfd == NULL)
{
+ close (ofd);
bfd_nonfatal_message (output_filename, NULL, NULL, NULL);
status = 1;
return;
}
+
/* This is a no-op on non-Coff targets. */
set_long_section_mode (obfd, ibfd, long_section_names);
@@ -4802,6 +4814,7 @@ strip_main (int argc, char *argv[])
int hold_status = status;
struct stat statbuf;
char *tmpname;
+ int tmpfd = -1;
if (get_file_size (argv[i]) < 1)
{
@@ -4816,7 +4829,7 @@ strip_main (int argc, char *argv[])
if (output_file == NULL
|| filename_cmp (argv[i], output_file) == 0)
- tmpname = make_tempname (argv[i]);
+ tmpname = make_tempname (argv[i], &tmpfd);
else
tmpname = output_file;
@@ -4829,7 +4842,7 @@ strip_main (int argc, char *argv[])
}
status = 0;
- copy_file (argv[i], tmpname, input_target, output_target, NULL);
+ copy_file (argv[i], tmpname, tmpfd, input_target, output_target, NULL);
if (status == 0)
{
if (preserve_dates)
@@ -5049,7 +5062,7 @@ copy_main (int argc, char *argv[])
bfd_boolean formats_info = FALSE;
bfd_boolean use_globalize = FALSE;
bfd_boolean use_keep_global = FALSE;
- int c;
+ int c, tmpfd = -1;
struct stat statbuf;
const bfd_arch_info_type *input_arch = NULL;
@@ -5895,7 +5908,7 @@ copy_main (int argc, char *argv[])
are the same, then create a temp and rename the result into the input. */
if (output_filename == NULL
|| filename_cmp (input_filename, output_filename) == 0)
- tmpname = make_tempname (input_filename);
+ tmpname = make_tempname (input_filename, &tmpfd);
else
tmpname = output_filename;
@@ -5903,7 +5916,8 @@ copy_main (int argc, char *argv[])
fatal (_("warning: could not create temporary file whilst copying '%s', (error: %s)"),
input_filename, strerror (errno));
- copy_file (input_filename, tmpname, input_target, output_target, input_arch);
+ copy_file (input_filename, tmpname, tmpfd, input_target, output_target,
+ input_arch);
if (status == 0)
{
if (preserve_dates)
--
2.26.2
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