[PATCH 16/26] tests: Add unshare syscall decoding check

[Eugene Syromyatnikov]

* tests/unshare.c: New file.
* tests/unshare.test: New test.
* tests/.gitignore: Add unshare.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add unshare.test.
---
 tests/.gitignore   |    1 +
 tests/Makefile.am  |    2 ++
 tests/unshare.c    |   82 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/unshare.test |    6 ++++
 4 files changed, 91 insertions(+)
 create mode 100644 tests/unshare.c
 create mode 100755 tests/unshare.test

diff --git a/tests/.gitignore b/tests/.gitignore
index 11df7e3..e1c1be6 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -323,6 +323,7 @@ unix-pair-send-recv
 unix-pair-sendto-recvfrom
 unlink
 unlinkat
+unshare
 userfaultfd
 utime
 utimensat
diff --git a/tests/Makefile.am b/tests/Makefile.am
index b79f755..0c799b3 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -381,6 +381,7 @@ check_PROGRAMS = \
 	unix-pair-sendto-recvfrom \
 	unlink \
 	unlinkat \
+	unshare \
 	userfaultfd \
 	utime \
 	utimensat \
@@ -736,6 +737,7 @@ DECODER_TESTS = \
 	unix-pair-sendto-recvfrom.test \
 	unlink.test \
 	unlinkat.test \
+	unshare.test \
 	userfaultfd.test \
 	utime.test \
 	utimensat.test \
diff --git a/tests/unshare.c b/tests/unshare.c
new file mode 100644
index 0000000..7b702dc
--- /dev/null
+++ b/tests/unshare.c
@@ -0,0 +1,82 @@
+/*
+ * Check decoding of unshare syscall.
+ *
+ * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr at gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+
+#include <asm/unistd.h>
+
+#ifdef __NR_unshare
+
+# include <stdio.h>
+# include <unistd.h>
+
+# include "kernel_types.h"
+
+int
+main(void)
+{
+	static const kernel_ulong_t bogus_flags =
+		(kernel_ulong_t) 0xbadc0ded0000000fULL;
+
+	static struct {
+		kernel_ulong_t val;
+		const char *str;
+	} unshare_flags[] = {
+		{ ARG_STR(0) },
+		{ 0xdeadca75,
+			"CLONE_THREAD|CLONE_FS|CLONE_SIGHAND|CLONE_SYSVSEM|"
+			"CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET|CLONE_NEWUSER|"
+			"CLONE_NEWCGROUP|0x80a8c075" },
+		{ 0x2000000, "CLONE_NEWCGROUP" },
+		{ ARG_STR(0x81f8f0ff) " /* CLONE_??? */" },
+	};
+
+	long rc;
+	unsigned int i;
+
+	rc = syscall(__NR_unshare, bogus_flags);
+	printf("unshare(%#llx /* CLONE_??? */) = %s\n",
+	       (unsigned long long) bogus_flags, sprintrc(rc));
+
+	for (i = 0; i < ARRAY_SIZE(unshare_flags); i++) {
+		rc = syscall(__NR_unshare, unshare_flags[i].val);
+		printf("unshare(%s) = %s\n",
+		       unshare_flags[i].str, sprintrc(rc));
+	}
+
+	puts("+++ exited with 0 +++");
+
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_unshare");
+
+#endif
diff --git a/tests/unshare.test b/tests/unshare.test
new file mode 100755
index 0000000..ccb9575
--- /dev/null
+++ b/tests/unshare.test
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check decoding of setns syscall.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a11
-- 
1.7.10.4