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-rw-r--r--ChangeLog12
-rw-r--r--admin/ChangeLog5
-rwxr-xr-xadmin/merge-gnulib2
-rw-r--r--configure.ac2
-rw-r--r--lib-src/ChangeLog9
-rw-r--r--lib-src/movemail.c17
-rw-r--r--lib-src/update-game-score.c12
-rw-r--r--lib/gnulib.mk32
-rw-r--r--lib/mkostemp.c46
-rw-r--r--lib/secure_getenv.c41
-rw-r--r--lib/tempname.c306
-rw-r--r--lib/tempname.h50
-rw-r--r--m4/gnulib-comp.m444
-rw-r--r--m4/mkostemp.m423
-rw-r--r--m4/secure_getenv.m425
-rw-r--r--m4/tempname.m419
-rw-r--r--src/ChangeLog7
-rw-r--r--src/callproc.c14
-rw-r--r--src/filelock.c18
19 files changed, 632 insertions, 52 deletions
diff --git a/ChangeLog b/ChangeLog
index bc70b1e444..cd8ce1a25e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2013-08-04 Paul Eggert <eggert@cs.ucla.edu>
+
+ Fix some minor races in hosts lacking mkostemp (Bug#15015).
+ Gnulib's emulation of mkostemp doesn't have races that Emacs's does.
+ * configure.ac (mkostemp): Remove check for this function;
+ gnulib does the check now.
+ (mkstemp): Remove check for this no-longer-used function.
+ * lib/mkostemp.c, lib/secure_getenv.c, lib/tempname.c, lib/tempname.h:
+ * m4/mkostemp.m4, m4/secure_getenv.m4, m4/tempname.m4:
+ New files, copied from Gnulib.
+ * lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
+
2013-07-29 Michael Albinus <michael.albinus@gmx.de>
* INSTALL (DETAILED BUILDING AND INSTALLATION): Add
diff --git a/admin/ChangeLog b/admin/ChangeLog
index cbcd698e8b..5373a9d20b 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,8 @@
+2013-08-04 Paul Eggert <eggert@cs.ucla.edu>
+
+ Fix some minor races in hosts lacking mkostemp (Bug#15015).
+ * merge-gnulib (GNULIB_MODULES): Add mkostemp.
+
2013-07-12 Glenn Morris <rgm@gnu.org>
* admin.el (manual-style-string): Use non-abbreviated url.
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 82e0cd77fc..97126704d1 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -32,7 +32,7 @@ GNULIB_MODULES='
fcntl fcntl-h fdatasync fdopendir filemode fstatat fsync
getloadavg getopt-gnu gettime gettimeofday
intprops largefile lstat
- manywarnings memrchr mktime
+ manywarnings memrchr mkostemp mktime
pipe2 pselect pthread_sigmask putenv qacl readlink readlinkat
sig2str socklen stat-time stdalign stdarg stdbool stdio
strftime strtoimax strtoumax symlink sys_stat
diff --git a/configure.ac b/configure.ac
index d8557f2989..89aba556bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3277,7 +3277,7 @@ select getpagesize setlocale \
getrlimit setrlimit shutdown getaddrinfo \
strsignal setitimer \
sendto recvfrom getsockname getpeername getifaddrs freeifaddrs \
-gai_strerror mkostemp mkstemp getline getdelim sync \
+gai_strerror getline getdelim sync \
difftime posix_memalign \
getpwent endpwent getgrent endgrent \
touchlock \
diff --git a/lib-src/ChangeLog b/lib-src/ChangeLog
index f41c23df5d..2cfe46f535 100644
--- a/lib-src/ChangeLog
+++ b/lib-src/ChangeLog
@@ -1,3 +1,12 @@
+2013-08-04 Paul Eggert <eggert@cs.ucla.edu>
+
+ Fix some minor races in hosts lacking mkostemp (Bug#15015).
+ * movemail.c (main):
+ * update-game-score.c (write_scores):
+ Use mkostemp (which now works on all platforms, due to changes
+ in the portability layer) rather than mktemp (which has a race)
+ or mkstemp (which we no longer bother with).
+
2013-07-10 Paul Eggert <eggert@cs.ucla.edu>
Port to C89.
diff --git a/lib-src/movemail.c b/lib-src/movemail.c
index 81ac8aa187..9434782cb1 100644
--- a/lib-src/movemail.c
+++ b/lib-src/movemail.c
@@ -304,24 +304,13 @@ main (int argc, char **argv)
memcpy (tempname, inname, inname_dirlen);
strcpy (tempname + inname_dirlen, "EXXXXXX");
-#ifdef HAVE_MKSTEMP
- desc = mkstemp (tempname);
-#else
- mktemp (tempname);
- if (!*tempname)
- desc = -1;
- else
- {
- unlink (tempname);
- desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0600);
- }
-#endif
+ desc = mkostemp (tempname, 0);
if (desc < 0)
{
- int mkstemp_errno = errno;
+ int mkostemp_errno = errno;
error ("error while creating what would become the lock file",
0, 0);
- errno = mkstemp_errno;
+ errno = mkostemp_errno;
pfatal_with_name (tempname);
}
close (desc);
diff --git a/lib-src/update-game-score.c b/lib-src/update-game-score.c
index ec8b431777..1699e305c8 100644
--- a/lib-src/update-game-score.c
+++ b/lib-src/update-game-score.c
@@ -383,6 +383,7 @@ sort_scores (struct score_entry *scores, int count, int reverse)
static int
write_scores (const char *filename, const struct score_entry *scores, int count)
{
+ int fd;
FILE *f;
int i;
char *tempfile = malloc (strlen (filename) + strlen (".tempXXXXXX") + 1);
@@ -390,12 +391,11 @@ write_scores (const char *filename, const struct score_entry *scores, int count)
return -1;
strcpy (tempfile, filename);
strcat (tempfile, ".tempXXXXXX");
-#ifdef HAVE_MKSTEMP
- if (mkstemp (tempfile) < 0
-#else
- if (mktemp (tempfile) != tempfile
-#endif
- || !(f = fopen (tempfile, "w")))
+ fd = mkostemp (tempfile, 0);
+ if (fd < 0)
+ return -1;
+ f = fdopen (fd, "w");
+ if (! f)
return -1;
for (i = 0; i < count; i++)
if (fprintf (f, "%ld %s %s\n", scores[i].score, scores[i].username,
diff --git a/lib/gnulib.mk b/lib/gnulib.mk
index d053e15efc..32255181fb 100644
--- a/lib/gnulib.mk
+++ b/lib/gnulib.mk
@@ -21,7 +21,7 @@
# the same distribution terms as the rest of that program.
#
# Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl fcntl-h fdatasync fdopendir filemode fstatat fsync getloadavg getopt-gnu gettime gettimeofday intprops largefile lstat manywarnings memrchr mktime pipe2 pselect pthread_sigmask putenv qacl readlink readlinkat sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open --avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl fcntl-h fdatasync fdopendir filemode fstatat fsync getloadavg getopt-gnu gettime gettimeofday intprops largefile lstat manywarnings memrchr mkostemp mktime pipe2 pselect pthread_sigmask putenv qacl readlink readlinkat sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
MOSTLYCLEANFILES += core *.stackdump
@@ -560,6 +560,15 @@ EXTRA_libgnu_a_SOURCES += memrchr.c
## end gnulib module memrchr
+## begin gnulib module mkostemp
+
+
+EXTRA_DIST += mkostemp.c
+
+EXTRA_libgnu_a_SOURCES += mkostemp.c
+
+## end gnulib module mkostemp
+
## begin gnulib module mktime
@@ -657,6 +666,17 @@ EXTRA_DIST += root-uid.h
## end gnulib module root-uid
+## begin gnulib module secure_getenv
+
+if gl_GNULIB_ENABLED_secure_getenv
+
+endif
+EXTRA_DIST += secure_getenv.c
+
+EXTRA_libgnu_a_SOURCES += secure_getenv.c
+
+## end gnulib module secure_getenv
+
## begin gnulib module sig2str
@@ -1480,6 +1500,16 @@ EXTRA_DIST += sys_time.in.h
## end gnulib module sys_time
+## begin gnulib module tempname
+
+if gl_GNULIB_ENABLED_tempname
+libgnu_a_SOURCES += tempname.c
+
+endif
+EXTRA_DIST += tempname.h
+
+## end gnulib module tempname
+
## begin gnulib module time
BUILT_SOURCES += time.h
diff --git a/lib/mkostemp.c b/lib/mkostemp.c
new file mode 100644
index 0000000000..2188ff5dd6
--- /dev/null
+++ b/lib/mkostemp.c
@@ -0,0 +1,46 @@
+/* Copyright (C) 1998-1999, 2001, 2005-2007, 2009-2013 Free Software
+ Foundation, Inc.
+ This file is derived from the one in the GNU C Library.
+
+ 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
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#if !_LIBC
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+
+#if !_LIBC
+# include "tempname.h"
+# define __gen_tempname gen_tempname
+# ifndef __GTFILE
+# define __GT_FILE GT_FILE
+# endif
+#endif
+
+#include <stdio.h>
+
+#ifndef __GT_FILE
+# define __GT_FILE 0
+#endif
+
+/* Generate a unique temporary file name from XTEMPLATE.
+ The last six characters of XTEMPLATE must be "XXXXXX";
+ they are replaced with a string that makes the file name unique.
+ Then open the file and return a fd. */
+int
+mkostemp (char *xtemplate, int flags)
+{
+ return __gen_tempname (xtemplate, 0, flags, __GT_FILE);
+}
diff --git a/lib/secure_getenv.c b/lib/secure_getenv.c
new file mode 100644
index 0000000000..6c11c5e0ed
--- /dev/null
+++ b/lib/secure_getenv.c
@@ -0,0 +1,41 @@
+/* Look up an environment variable more securely.
+
+ Copyright 2013 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 the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#if !HAVE___SECURE_GETENV
+# if HAVE_ISSETUGID
+# include <unistd.h>
+# else
+# undef issetugid
+# define issetugid() 1
+# endif
+#endif
+
+char *
+secure_getenv (char const *name)
+{
+#if HAVE___SECURE_GETENV
+ return __secure_getenv (name);
+#else
+ if (issetugid ())
+ return 0;
+ return getenv (name);
+#endif
+}
diff --git a/lib/tempname.c b/lib/tempname.c
new file mode 100644
index 0000000000..087b79b31f
--- /dev/null
+++ b/lib/tempname.c
@@ -0,0 +1,306 @@
+/* tempname.c - generate the name of a temporary file.
+
+ Copyright (C) 1991-2003, 2005-2007, 2009-2013 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
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Extracted from glibc sysdeps/posix/tempname.c. See also tmpdir.c. */
+
+#if !_LIBC
+# include <config.h>
+# include "tempname.h"
+#endif
+
+#include <sys/types.h>
+#include <assert.h>
+
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(Val) errno = (Val)
+#endif
+
+#include <stdio.h>
+#ifndef P_tmpdir
+# define P_tmpdir "/tmp"
+#endif
+#ifndef TMP_MAX
+# define TMP_MAX 238328
+#endif
+#ifndef __GT_FILE
+# define __GT_FILE 0
+# define __GT_DIR 1
+# define __GT_NOCREATE 2
+#endif
+#if !_LIBC && (GT_FILE != __GT_FILE || GT_DIR != __GT_DIR \
+ || GT_NOCREATE != __GT_NOCREATE)
+# error report this to bug-gnulib@gnu.org
+#endif
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <fcntl.h>
+#include <sys/time.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+
+#if _LIBC
+# define struct_stat64 struct stat64
+#else
+# define struct_stat64 struct stat
+# define __gen_tempname gen_tempname
+# define __getpid getpid
+# define __gettimeofday gettimeofday
+# define __mkdir mkdir
+# define __open open
+# define __lxstat64(version, file, buf) lstat (file, buf)
+# define __secure_getenv secure_getenv
+#endif
+
+#ifdef _LIBC
+# include <hp-timing.h>
+# if HP_TIMING_AVAIL
+# define RANDOM_BITS(Var) \
+ if (__builtin_expect (value == UINT64_C (0), 0)) \
+ { \
+ /* If this is the first time this function is used initialize \
+ the variable we accumulate the value in to some somewhat \
+ random value. If we'd not do this programs at startup time \
+ might have a reduced set of possible names, at least on slow \
+ machines. */ \
+ struct timeval tv; \
+ __gettimeofday (&tv, NULL); \
+ value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
+ } \
+ HP_TIMING_NOW (Var)
+# endif
+#endif
+
+/* Use the widest available unsigned type if uint64_t is not
+ available. The algorithm below extracts a number less than 62**6
+ (approximately 2**35.725) from uint64_t, so ancient hosts where
+ uintmax_t is only 32 bits lose about 3.725 bits of randomness,
+ which is better than not having mkstemp at all. */
+#if !defined UINT64_MAX && !defined uint64_t
+# define uint64_t uintmax_t
+#endif
+
+#if _LIBC
+/* Return nonzero if DIR is an existent directory. */
+static int
+direxists (const char *dir)
+{
+ struct_stat64 buf;
+ return __xstat64 (_STAT_VER, dir, &buf) == 0 && S_ISDIR (buf.st_mode);
+}
+
+/* Path search algorithm, for tmpnam, tmpfile, etc. If DIR is
+ non-null and exists, uses it; otherwise uses the first of $TMPDIR,
+ P_tmpdir, /tmp that exists. Copies into TMPL a template suitable
+ for use with mk[s]temp. Will fail (-1) if DIR is non-null and
+ doesn't exist, none of the searched dirs exists, or there's not
+ enough space in TMPL. */
+int
+__path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
+ int try_tmpdir)
+{
+ const char *d;
+ size_t dlen, plen;
+
+ if (!pfx || !pfx[0])
+ {
+ pfx = "file";
+ plen = 4;
+ }
+ else
+ {
+ plen = strlen (pfx);
+ if (plen > 5)
+ plen = 5;
+ }
+
+ if (try_tmpdir)
+ {
+ d = __secure_getenv ("TMPDIR");
+ if (d != NULL && direxists (d))
+ dir = d;
+ else if (dir != NULL && direxists (dir))
+ /* nothing */ ;
+ else
+ dir = NULL;
+ }
+ if (dir == NULL)
+ {
+ if (direxists (P_tmpdir))
+ dir = P_tmpdir;
+ else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
+ dir = "/tmp";
+ else
+ {
+ __set_errno (ENOENT);
+ return -1;
+ }
+ }
+
+ dlen = strlen (dir);
+ while (dlen > 1 && dir[dlen - 1] == '/')
+ dlen--; /* remove trailing slashes */
+
+ /* check we have room for "${dir}/${pfx}XXXXXX\0" */
+ if (tmpl_len < dlen + 1 + plen + 6 + 1)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
+ return 0;
+}
+#endif /* _LIBC */
+
+/* These are the characters used in temporary file names. */
+static const char letters[] =
+"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+/* Generate a temporary file name based on TMPL. TMPL must match the
+ rules for mk[s]temp (i.e. end in "XXXXXX", possibly with a suffix).
+ The name constructed does not exist at the time of the call to
+ __gen_tempname. TMPL is overwritten with the result.
+
+ KIND may be one of:
+ __GT_NOCREATE: simply verify that the name does not exist
+ at the time of the call.
+ __GT_FILE: create the file using open(O_CREAT|O_EXCL)
+ and return a read-write fd. The file is mode 0600.
+ __GT_DIR: create a directory, which will be mode 0700.
+
+ We use a clever algorithm to get hard-to-predict names. */
+int
+__gen_tempname (char *tmpl, int suffixlen, int flags, int kind)
+{
+ int len;
+ char *XXXXXX;
+ static uint64_t value;
+ uint64_t random_time_bits;
+ unsigned int count;
+ int fd = -1;
+ int save_errno = errno;
+ struct_stat64 st;
+
+ /* A lower bound on the number of temporary files to attempt to
+ generate. The maximum total number of temporary file names that
+ can exist for a given template is 62**6. It should never be
+ necessary to try all of these combinations. Instead if a reasonable
+ number of names is tried (we define reasonable as 62**3) fail to
+ give the system administrator the chance to remove the problems. */
+#define ATTEMPTS_MIN (62 * 62 * 62)
+
+ /* The number of times to attempt to generate a temporary file. To
+ conform to POSIX, this must be no smaller than TMP_MAX. */
+#if ATTEMPTS_MIN < TMP_MAX
+ unsigned int attempts = TMP_MAX;
+#else
+ unsigned int attempts = ATTEMPTS_MIN;
+#endif
+
+ len = strlen (tmpl);
+ if (len < 6 + suffixlen || memcmp (&tmpl[len - 6 - suffixlen], "XXXXXX", 6))
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ /* This is where the Xs start. */
+ XXXXXX = &tmpl[len - 6 - suffixlen];
+
+ /* Get some more or less random data. */
+#ifdef RANDOM_BITS
+ RANDOM_BITS (random_time_bits);
+#else
+ {
+ struct timeval tv;
+ __gettimeofday (&tv, NULL);
+ random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
+ }
+#endif
+ value += random_time_bits ^ __getpid ();
+
+ for (count = 0; count < attempts; value += 7777, ++count)
+ {
+ uint64_t v = value;
+
+ /* Fill in the random bits. */
+ XXXXXX[0] = letters[v % 62];
+ v /= 62;
+ XXXXXX[1] = letters[v % 62];
+ v /= 62;
+ XXXXXX[2] = letters[v % 62];
+ v /= 62;
+ XXXXXX[3] = letters[v % 62];
+ v /= 62;
+ XXXXXX[4] = letters[v % 62];
+ v /= 62;
+ XXXXXX[5] = letters[v % 62];
+
+ switch (kind)
+ {
+ case __GT_FILE:
+ fd = __open (tmpl,
+ (flags & ~O_ACCMODE)
+ | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+ break;
+
+ case __GT_DIR:
+ fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
+ break;
+
+ case __GT_NOCREATE:
+ /* This case is backward from the other three. __gen_tempname
+ succeeds if __xstat fails because the name does not exist.
+ Note the continue to bypass the common logic at the bottom
+ of the loop. */
+ if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
+ {
+ if (errno == ENOENT)
+ {
+ __set_errno (save_errno);
+ return 0;
+ }
+ else
+ /* Give up now. */
+ return -1;
+ }
+ continue;
+
+ default:
+ assert (! "invalid KIND in __gen_tempname");
+ abort ();
+ }
+
+ if (fd >= 0)
+ {
+ __set_errno (save_errno);
+ return fd;
+ }
+ else if (errno != EEXIST)
+ return -1;
+ }
+
+ /* We got out of the loop because we ran out of combinations to try. */
+ __set_errno (EEXIST);
+ return -1;
+}
diff --git a/lib/tempname.h b/lib/tempname.h
new file mode 100644
index 0000000000..333267dfd0
--- /dev/null
+++ b/lib/tempname.h
@@ -0,0 +1,50 @@
+/* Create a temporary file or directory.
+
+ Copyright (C) 2006, 2009-2013 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
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* header written by Eric Blake */
+
+#ifndef GL_TEMPNAME_H
+# define GL_TEMPNAME_H
+
+# include <stdio.h>
+
+# ifdef __GT_FILE
+# define GT_FILE __GT_FILE
+# define GT_DIR __GT_DIR
+# define GT_NOCREATE __GT_NOCREATE
+# else
+# define GT_FILE 0
+# define GT_DIR 1
+# define GT_NOCREATE 2
+# endif
+
+/* Generate a temporary file name based on TMPL. TMPL must match the
+ rules for mk[s]temp (i.e. end in "XXXXXX", possibly with a suffix).
+ The name constructed does not exist at the time of the call to
+ gen_tempname. TMPL is overwritten with the result.
+
+ KIND may be one of:
+ GT_NOCREATE: simply verify that the name does not exist
+ at the time of the call.
+ GT_FILE: create a large file using open(O_CREAT|O_EXCL)
+ and return a read-write fd. The file is mode 0600.
+ GT_DIR: create a directory, which will be mode 0700.
+
+ We use a clever algorithm to get hard-to-predict names. */
+extern int gen_tempname (char *tmpl, int suffixlen, int flags, int kind);
+
+#endif /* GL_TEMPNAME_H */
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index d7062e862d..af9a9ca3ae 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -89,6 +89,7 @@ AC_DEFUN([gl_EARLY],
# Code from module lstat:
# Code from module manywarnings:
# Code from module memrchr:
+ # Code from module mkostemp:
# Code from module mktime:
# Code from module multiarch:
# Code from module nocrash:
@@ -102,6 +103,7 @@ AC_DEFUN([gl_EARLY],
# Code from module readlink:
# Code from module readlinkat:
# Code from module root-uid:
+ # Code from module secure_getenv:
# Code from module sig2str:
# Code from module signal-h:
# Code from module snippet/_Noreturn:
@@ -134,6 +136,7 @@ AC_DEFUN([gl_EARLY],
# Code from module sys_select:
# Code from module sys_stat:
# Code from module sys_time:
+ # Code from module tempname:
# Code from module time:
# Code from module time_r:
# Code from module timer-time:
@@ -274,6 +277,13 @@ AC_DEFUN([gl_INIT],
gl_PREREQ_MEMRCHR
fi
gl_STRING_MODULE_INDICATOR([memrchr])
+ gl_FUNC_MKOSTEMP
+ if test $HAVE_MKOSTEMP = 0; then
+ AC_LIBOBJ([mkostemp])
+ gl_PREREQ_MKOSTEMP
+ fi
+ gl_MODULE_INDICATOR([mkostemp])
+ gl_STDLIB_MODULE_INDICATOR([mkostemp])
gl_FUNC_MKTIME
if test $REPLACE_MKTIME = 1; then
AC_LIBOBJ([mktime])
@@ -381,9 +391,11 @@ AC_DEFUN([gl_INIT],
gl_gnulib_enabled_03e0aaad4cb89ca757653bd367a6ccb7=false
gl_gnulib_enabled_pathmax=false
gl_gnulib_enabled_6099e9737f757db36c47fa9d9f02e88c=false
+ gl_gnulib_enabled_secure_getenv=false
gl_gnulib_enabled_stat=false
gl_gnulib_enabled_strtoll=false
gl_gnulib_enabled_strtoull=false
+ gl_gnulib_enabled_tempname=false
gl_gnulib_enabled_682e609604ccaac6be382e4ee3a4eaec=false
func_gl_gnulib_m4code_260941c0e5dc67ec9e87d1fb321c300b ()
{
@@ -485,6 +497,18 @@ AC_DEFUN([gl_INIT],
gl_gnulib_enabled_6099e9737f757db36c47fa9d9f02e88c=true
fi
}
+ func_gl_gnulib_m4code_secure_getenv ()
+ {
+ if ! $gl_gnulib_enabled_secure_getenv; then
+ gl_FUNC_SECURE_GETENV
+ if test $HAVE_SECURE_GETENV = 0; then
+ AC_LIBOBJ([secure_getenv])
+ gl_PREREQ_SECURE_GETENV
+ fi
+ gl_STDLIB_MODULE_INDICATOR([secure_getenv])
+ gl_gnulib_enabled_secure_getenv=true
+ fi
+ }
func_gl_gnulib_m4code_stat ()
{
if ! $gl_gnulib_enabled_stat; then
@@ -527,6 +551,14 @@ AC_DEFUN([gl_INIT],
gl_gnulib_enabled_strtoull=true
fi
}
+ func_gl_gnulib_m4code_tempname ()
+ {
+ if ! $gl_gnulib_enabled_tempname; then
+ gl_FUNC_GEN_TEMPNAME
+ gl_gnulib_enabled_tempname=true
+ func_gl_gnulib_m4code_secure_getenv
+ fi
+ }
func_gl_gnulib_m4code_682e609604ccaac6be382e4ee3a4eaec ()
{
if ! $gl_gnulib_enabled_682e609604ccaac6be382e4ee3a4eaec; then
@@ -569,6 +601,9 @@ AC_DEFUN([gl_INIT],
if test $REPLACE_LSTAT = 1; then
func_gl_gnulib_m4code_stat
fi
+ if test $HAVE_MKOSTEMP = 0; then
+ func_gl_gnulib_m4code_tempname
+ fi
if test $HAVE_READLINK = 0 || test $REPLACE_READLINK = 1; then
func_gl_gnulib_m4code_stat
fi
@@ -598,9 +633,11 @@ AC_DEFUN([gl_INIT],
AM_CONDITIONAL([gl_GNULIB_ENABLED_03e0aaad4cb89ca757653bd367a6ccb7], [$gl_gnulib_enabled_03e0aaad4cb89ca757653bd367a6ccb7])
AM_CONDITIONAL([gl_GNULIB_ENABLED_pathmax], [$gl_gnulib_enabled_pathmax])
AM_CONDITIONAL([gl_GNULIB_ENABLED_6099e9737f757db36c47fa9d9f02e88c], [$gl_gnulib_enabled_6099e9737f757db36c47fa9d9f02e88c])
+ AM_CONDITIONAL([gl_GNULIB_ENABLED_secure_getenv], [$gl_gnulib_enabled_secure_getenv])
AM_CONDITIONAL([gl_GNULIB_ENABLED_stat], [$gl_gnulib_enabled_stat])
AM_CONDITIONAL([gl_GNULIB_ENABLED_strtoll], [$gl_gnulib_enabled_strtoll])
AM_CONDITIONAL([gl_GNULIB_ENABLED_strtoull], [$gl_gnulib_enabled_strtoull])
+ AM_CONDITIONAL([gl_GNULIB_ENABLED_tempname], [$gl_gnulib_enabled_tempname])
AM_CONDITIONAL([gl_GNULIB_ENABLED_682e609604ccaac6be382e4ee3a4eaec], [$gl_gnulib_enabled_682e609604ccaac6be382e4ee3a4eaec])
# End of code from modules
m4_ifval(gl_LIBSOURCES_LIST, [
@@ -806,6 +843,7 @@ AC_DEFUN([gl_FILE_LIST], [
lib/md5.c
lib/md5.h
lib/memrchr.c
+ lib/mkostemp.c
lib/mktime-internal.h
lib/mktime.c
lib/openat-priv.h
@@ -821,6 +859,7 @@ AC_DEFUN([gl_FILE_LIST], [
lib/readlink.c
lib/readlinkat.c
lib/root-uid.h
+ lib/secure_getenv.c
lib/sha1.c
lib/sha1.h
lib/sha256.c
@@ -853,6 +892,8 @@ AC_DEFUN([gl_FILE_LIST], [
lib/sys_select.in.h
lib/sys_stat.in.h
lib/sys_time.in.h
+ lib/tempname.c
+ lib/tempname.h
lib/time.in.h
lib/time_r.c
lib/timespec-add.c
@@ -908,6 +949,7 @@ AC_DEFUN([gl_FILE_LIST], [
m4/manywarnings.m4
m4/md5.m4
m4/memrchr.m4
+ m4/mkostemp.m4
m4/mktime.m4
m4/multiarch.m4
m4/nocrash.m4
@@ -919,6 +961,7 @@ AC_DEFUN([gl_FILE_LIST], [
m4/putenv.m4
m4/readlink.m4
m4/readlinkat.m4
+ m4/secure_getenv.m4
m4/setenv.m4
m4/sha1.m4
m4/sha256.m4
@@ -948,6 +991,7 @@ AC_DEFUN([gl_FILE_LIST], [
m4/sys_socket_h.m4
m4/sys_stat_h.m4
m4/sys_time_h.m4
+ m4/tempname.m4
m4/time_h.m4
m4/time_r.m4
m4/timer_time.m4
diff --git a/m4/mkostemp.m4 b/m4/mkostemp.m4
new file mode 100644
index 0000000000..6d101eeda3
--- /dev/null
+++ b/m4/mkostemp.m4
@@ -0,0 +1,23 @@
+# mkostemp.m4 serial 2
+dnl Copyright (C) 2009-2013 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_MKOSTEMP],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+
+ dnl Persuade glibc <stdlib.h> to declare mkostemp().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ AC_CHECK_FUNCS_ONCE([mkostemp])
+ if test $ac_cv_func_mkostemp != yes; then
+ HAVE_MKOSTEMP=0
+ fi
+])
+
+# Prerequisites of lib/mkostemp.c.
+AC_DEFUN([gl_PREREQ_MKOSTEMP],
+[
+])
diff --git a/m4/secure_getenv.m4 b/m4/secure_getenv.m4
new file mode 100644
index 0000000000..5da5298f66
--- /dev/null
+++ b/m4/secure_getenv.m4
@@ -0,0 +1,25 @@
+# Look up an environment variable more securely.
+dnl Copyright 2013 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_SECURE_GETENV],
+[
+ dnl Persuade glibc <stdlib.h> to declare secure_getenv().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([secure_getenv])
+ if test $ac_cv_func_secure_getenv = no; then
+ HAVE_SECURE_GETENV=0
+ fi
+])
+
+# Prerequisites of lib/secure_getenv.c.
+AC_DEFUN([gl_PREREQ_SECURE_GETENV], [
+ AC_CHECK_FUNCS([__secure_getenv])
+ if test $ac_cv_func___secure_getenv = no; then
+ AC_CHECK_FUNCS([issetugid])
+ fi
+])
diff --git a/m4/tempname.m4 b/m4/tempname.m4
new file mode 100644
index 0000000000..a6e42dcea8
--- /dev/null
+++ b/m4/tempname.m4
@@ -0,0 +1,19 @@
+#serial 5
+
+# Copyright (C) 2006-2007, 2009-2013 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# glibc provides __gen_tempname as a wrapper for mk[ds]temp. Expose
+# it as a public API, and provide it on systems that are lacking.
+AC_DEFUN([gl_FUNC_GEN_TEMPNAME],
+[
+ gl_PREREQ_TEMPNAME
+])
+
+# Prerequisites of lib/tempname.c.
+AC_DEFUN([gl_PREREQ_TEMPNAME],
+[
+ :
+])
diff --git a/src/ChangeLog b/src/ChangeLog
index c29c4c8da5..f8f2fa4708 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2013-08-04 Paul Eggert <eggert@cs.ucla.edu>
+
+ Fix some minor races in hosts lacking mkostemp (Bug#15015).
+ * callproc.c (create_temp_file):
+ * filelock.c (create_lock_file):
+ Assume mkostemp, since it's now provided by Gnulib.
+
2013-08-04 Eli Zaretskii <eliz@gnu.org>
* w32.c (mkostemp): New function.
diff --git a/src/callproc.c b/src/callproc.c
index 450fc57f92..54bc5cd9dc 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -1009,23 +1009,11 @@ create_temp_file (ptrdiff_t nargs, Lisp_Object *args)
tempfile = SSDATA (filename_string);
{
- int fd;
-
-#ifdef HAVE_MKOSTEMP
- fd = mkostemp (tempfile, O_CLOEXEC);
-#elif defined HAVE_MKSTEMP
- fd = mkstemp (tempfile);
-#else
- errno = EEXIST;
- mktemp (tempfile);
- fd = *tempfile ? 0 : -1;
-#endif
+ int fd = mkostemp (tempfile, O_CLOEXEC);
if (fd < 0)
report_file_error ("Failed to open temporary file using pattern",
pattern);
-#if defined HAVE_MKOSTEMP || defined HAVE_MKSTEMP
emacs_close (fd);
-#endif
}
record_unwind_protect (delete_temp_file, filename_string);
diff --git a/src/filelock.c b/src/filelock.c
index b9c991e4ba..0f31b7d4de 100644
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -411,28 +411,14 @@ create_lock_file (char *lfname, char *lock_info_str, bool force)
memcpy (nonce, lfname, lfdirlen);
strcpy (nonce + lfdirlen, nonce_base);
-#if HAVE_MKOSTEMP
- /* Prefer mkostemp to mkstemp, as it avoids a window where FD is
- temporarily open without close-on-exec. */
fd = mkostemp (nonce, O_BINARY | O_CLOEXEC);
-#elif HAVE_MKSTEMP
- /* Prefer mkstemp to mktemp, as it avoids a race between
- mktemp and emacs_open. */
- fd = mkstemp (nonce);
-#else
- mktemp (nonce);
- fd = emacs_open (nonce, O_WRONLY | O_CREAT | O_EXCL | O_BINARY,
- S_IRUSR | S_IWUSR);
-#endif
-
if (fd < 0)
err = errno;
else
{
ptrdiff_t lock_info_len;
-#if ! (HAVE_MKOSTEMP && O_CLOEXEC)
- fcntl (fd, F_SETFD, FD_CLOEXEC);
-#endif
+ if (! O_CLOEXEC)
+ fcntl (fd, F_SETFD, FD_CLOEXEC);
lock_info_len = strlen (lock_info_str);
err = 0;
/* Use 'write', not 'emacs_write', as garbage collection
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-13 01:02:24 +0000