Note: this test has already been in xfstests generic/028 test case,
I just port it to LTP.
Kernel commit '232d2d60aa5469bb097f55728f65146bd49c1d25' introduced a race
condition that causes getcwd(2) to return "/" instead of correct path.
232d2d6 dcache: Translating dentry into pathname without
taking rename_lock
And these two kernel commits have fixed this bug:
ede4cebce16f5643c61aedd6d88d9070a1d23a68
prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts
f6500801522c61782d4990fa1ad96154cb397cd4
f650080 __dentry_path() fixes
This test is to check whether this bug exists in the running kernel,
or whether this bug has been fixed.
Signed-off-by: Xiaoguang Wang <wangxg.f...@cn.fujitsu.com>
---
runtest/ltplite | 1 +
runtest/stress.part3 | 1 +
runtest/syscalls | 1 +
testcases/kernel/syscalls/.gitignore | 1 +
testcases/kernel/syscalls/getcwd/getcwd04.c | 143 ++++++++++++++++++++++++++++
5 files changed, 147 insertions(+)
create mode 100644 testcases/kernel/syscalls/getcwd/getcwd04.c
diff --git a/runtest/ltplite b/runtest/ltplite
index 50653a9..1457908 100644
--- a/runtest/ltplite
+++ b/runtest/ltplite
@@ -275,6 +275,7 @@ getcontext01 getcontext01
getcwd01 getcwd01
getcwd02 getcwd02
getcwd03 getcwd03
+getcwd04 getcwd04
getdents01 getdents01
getdents02 getdents02
diff --git a/runtest/stress.part3 b/runtest/stress.part3
index 39ce807..368c640 100644
--- a/runtest/stress.part3
+++ b/runtest/stress.part3
@@ -214,6 +214,7 @@ getcontext01 getcontext01
getcwd01 getcwd01
getcwd02 getcwd02
getcwd03 getcwd03
+getcwd04 getcwd04
getdents01 getdents01
getdents02 getdents02
diff --git a/runtest/syscalls b/runtest/syscalls
index fbed9cb..13218e3 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -329,6 +329,7 @@ getcpu01 getcpu01
getcwd01 getcwd01
getcwd02 getcwd02
getcwd03 getcwd03
+getcwd04 getcwd04
getdents01 getdents01
getdents02 getdents02
diff --git a/testcases/kernel/syscalls/.gitignore
b/testcases/kernel/syscalls/.gitignore
index b9d49cf..fd3282b 100644
--- a/testcases/kernel/syscalls/.gitignore
+++ b/testcases/kernel/syscalls/.gitignore
@@ -273,6 +273,7 @@
/getcwd/getcwd01
/getcwd/getcwd02
/getcwd/getcwd03
+/getcwd/getcwd04
/getdents/getdents01
/getdents/getdents01_64
/getdents/getdents02
diff --git a/testcases/kernel/syscalls/getcwd/getcwd04.c
b/testcases/kernel/syscalls/getcwd/getcwd04.c
new file mode 100644
index 0000000..a0285cb
--- /dev/null
+++ b/testcases/kernel/syscalls/getcwd/getcwd04.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2014 Fujitsu Ltd.
+ * Author: Xiaoguang Wang <wangxg.f...@cn.fujitsu.com>
+ *
+ * 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 2 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.
+ */
+
+/*
+ * Note: this test has already been in xfstests generic/028 test case,
+ * I just port it to LTP.
+ *
+ * Kernel commit '232d2d60aa5469bb097f55728f65146bd49c1d25' introduced a race
+ * condition that causes getcwd(2) to return "/" instead of correct path.
+ * 232d2d6 dcache: Translating dentry into pathname without
+ * taking rename_lock
+ *
+ * And these two kernel commits fixed the bug:
+ * ede4cebce16f5643c61aedd6d88d9070a1d23a68
+ * prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts
+ * f6500801522c61782d4990fa1ad96154cb397cd4
+ * f650080 __dentry_path() fixes
+ *
+ * This test is to check whether this bug exists in the running kernel,
+ * or whether this bug has been fixed.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "usctest.h"
+#include "test.h"
+#include "safe_macros.h"
+
+#define TIMEOUT 5
+
+static void setup(void);
+static void cleanup(void);
+static void do_child(void);
+static void sigproc(int sig);
+static volatile sig_atomic_t end;
+static char init_cwd[PATH_MAX];
+
+char *TCID = "getcwd04";
+int TST_TOTAL = 1;
+
+int main(int ac, char **av)
+{
+ int status;
+ const char *msg;
+ char cur_cwd[PATH_MAX];
+ pid_t child;
+
+ msg = parse_opts(ac, av, NULL, NULL);
+ if (msg != NULL)
+ tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
+
+ setup();
+
+ child = tst_fork();
+ if (child < 0)
+ tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
+
+ if (child == 0)
+ do_child();
+
+ while (1) {
+ SAFE_GETCWD(cleanup, cur_cwd, PATH_MAX);
+ if (strncmp(init_cwd, cur_cwd, PATH_MAX)) {
+ tst_resm(TFAIL, "initial current work directory is "
+ "%s, now is %s. Bug is reproduced!",
+ init_cwd, cur_cwd);
+ break;
+ }
+
+ if (end) {
+ tst_resm(TPASS, "Bug is not reproduced!");
+ break;
+ }
+ }
+
+ SAFE_KILL(cleanup, child, SIGKILL);
+ SAFE_WAITPID(cleanup, child, &status, 0);
+
+ cleanup();
+ tst_exit();
+}
+
+static void setup(void)
+{
+ tst_sig(FORK, DEF_HANDLER, cleanup);
+
+ TEST_PAUSE;
+
+ tst_tmpdir();
+
+ if (signal(SIGALRM, sigproc) == SIG_ERR)
+ tst_brkm(TBROK | TERRNO, cleanup, "signal(SIGALRM) failed");
+
+ alarm(TIMEOUT);
+
+ SAFE_MKDIR(cleanup, "testdir", 0755);
+ SAFE_CHDIR(cleanup, "testdir");
+
+ SAFE_GETCWD(cleanup, init_cwd, PATH_MAX);
+}
+
+static void sigproc(int sig)
+{
+ end = sig;
+}
+
+static void do_child(void)
+{
+ unsigned int i = 0;
+ char c_name[PATH_MAX] = "testfile", n_name[PATH_MAX];
+
+ SAFE_TOUCH(NULL, c_name, 0644, NULL);
+
+ while (1) {
+ snprintf(n_name, PATH_MAX, "testfile%u", i++);
+ SAFE_RENAME(NULL, c_name, n_name);
+ strncpy(c_name, n_name, PATH_MAX);
+ }
+}
+
+static void cleanup(void)
+{
+ TEST_CLEANUP;
+
+ tst_rmdir();
+}
--
1.8.2.1
------------------------------------------------------------------------------
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