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authorJoseph Myers <joseph@codesourcery.com>2018-07-18 21:04:12 +0000
committerJoseph Myers <joseph@codesourcery.com>2018-07-18 21:04:12 +0000
commit5c112f1b62b6fca7348c64a004e9fc4cfdaca1ad (patch)
tree67ea596cd3c6810bb13df1fb6a1e0d2ae29f7120 /stdio-common
parentx86/CET: Document glibc.tune.x86_ibt and glibc.tune.x86_shstk (diff)
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Avoid insecure usage of tmpnam in tests.
Various glibc testcases use tmpnam in ways subject to race conditions (generate a temporary file name, then later open that file without O_EXCL). This patch fixes those tests to use mkstemp - generally a minimal local fix to use mkstemp instead of tmpnam, rather than a larger fix to use other testsuite infrastructure for temporary files. The unchanged use of tmpnam in posix/wordexp-test.c would fail safe in the event of a race (it's generating a name for use with mkdir rather than for a file to be opened for writing). Tested for x86_64. * grp/tst_fgetgrent.c: Include <unistd.h>. (main): Use mkstemp instead of tmpnam. * io/test-utime.c (main): Likewise. * posix/annexc.c (macrofile): Change to modifiable array. (get_null_defines): Use mkstemp instead of tmpnam. Do not remove macrofile here. * posix/bug-getopt1.c: Include <stdlib.h>. (do_test): Use mkstemp instead of tmpnam. * posix/bug-getopt2.c: Include <stdlib.h>. (do_test): Use mkstemp instead of tmpnam. * posix/bug-getopt3.c: Include <stdlib.h>. (do_test): Use mkstemp instead of tmpnam. * posix/bug-getopt4.c: Include <stdlib.h>. (do_test): Use mkstemp instead of tmpnam. * posix/bug-getopt5.c: Include <stdlib.h>. (do_test): Use mkstemp instead of tmpnam. * stdio-common/bug7.c: Include <stdlib.h> and <unistd.h>. (main): Use mkstemp instead of tmpnam. * stdio-common/tst-fdopen.c: Include <stdlib.h>. (main): Use mkstemp instead of tmpnam. * stdio-common/tst-ungetc.c: Include <stdlib.h>. (main): use mkstemp instead of tmpnam. * stdlib/isomac.c (macrofile): Change to modifiable array. (get_null_defines): Use mkstemp instead of tmpnam. Do not remove macrofile here.
Diffstat (limited to 'stdio-common')
-rw-r--r--stdio-common/bug7.c22
-rw-r--r--stdio-common/tst-fdopen.c11
-rw-r--r--stdio-common/tst-ungetc.c11
3 files changed, 33 insertions, 11 deletions
diff --git a/stdio-common/bug7.c b/stdio-common/bug7.c
index 2b1efe3bc6..c9c2ef5139 100644
--- a/stdio-common/bug7.c
+++ b/stdio-common/bug7.c
@@ -1,21 +1,25 @@
/* Regression test for fseek and freopen bugs. */
#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
int
main (int argc, char *argv[])
{
int lose = 0;
- char filename[L_tmpnam];
+ char filename[] = "/tmp/bug7.XXXXXX";
FILE *fp;
- if (tmpnam (filename) == NULL)
+ int fd = mkstemp (filename);
+ if (fd == -1)
{
- printf ("tmpnam failed\n");
+ printf ("mkstemp failed\n");
lose = 1;
}
else
{
+ close (fd);
fp = fopen (filename, "w+");
fprintf (fp, "Hello world!\n");
fflush (fp);
@@ -32,17 +36,21 @@ main (int argc, char *argv[])
{
FILE *file1;
FILE *file2;
- char filename1[L_tmpnam];
- char filename2[L_tmpnam];
+ char filename1[] = "/tmp/bug7.XXXXXX";
+ char filename2[] = "/tmp/bug7.XXXXXX";
int ch;
- if (tmpnam (filename1) == NULL || tmpnam (filename2) == NULL)
+ int fd1 = mkstemp (filename1);
+ int fd2 = mkstemp (filename2);
+ if (fd1 == -1 || fd2 == -1)
{
- printf ("tmpnam failed\n");
+ printf ("mkstemp failed\n");
lose = 1;
}
else
{
+ close (fd1);
+ close (fd2);
file1 = fopen (filename1, "w");
fclose (file1);
diff --git a/stdio-common/tst-fdopen.c b/stdio-common/tst-fdopen.c
index e70a0cd6a5..136fff5858 100644
--- a/stdio-common/tst-fdopen.c
+++ b/stdio-common/tst-fdopen.c
@@ -1,6 +1,7 @@
/* Test for fdopen bugs. */
#include <stdio.h>
+#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
@@ -18,12 +19,18 @@ char buffer[256];
int
main (int argc, char *argv[])
{
- char *name;
+ char name[] = "/tmp/tst-fdopen.XXXXXX";
FILE *fp = NULL;
int retval = 0;
int fd;
- name = tmpnam (NULL);
+ fd = mkstemp (name);
+ if (fd == -1)
+ {
+ printf ("mkstemp failed: %m\n");
+ return 1;
+ }
+ close (fd);
fp = fopen (name, "w");
assert (fp != NULL)
fputs ("foobar and baz", fp);
diff --git a/stdio-common/tst-ungetc.c b/stdio-common/tst-ungetc.c
index 44cf6a6bf6..1344b2b591 100644
--- a/stdio-common/tst-ungetc.c
+++ b/stdio-common/tst-ungetc.c
@@ -1,6 +1,7 @@
/* Test for ungetc bugs. */
#include <stdio.h>
+#include <stdlib.h>
#include <unistd.h>
#undef assert
@@ -15,13 +16,19 @@
int
main (int argc, char *argv[])
{
- char *name;
+ char name[] = "/tmp/tst-ungetc.XXXXXX";
FILE *fp = NULL;
int retval = 0;
int c;
char buffer[64];
- name = tmpnam (NULL);
+ int fd = mkstemp (name);
+ if (fd == -1)
+ {
+ printf ("mkstemp failed: %m\n");
+ return 1;
+ }
+ close (fd);
fp = fopen (name, "w");
assert (fp != NULL)
fputs ("bla", fp);