[PATCH 07/15] tests: Add kcmp syscall decoding check

[Eugene Syromyatnikov]

* tests/kcmp.c: New file.
* tests/kcmp.test: New test.
* tests/.gitignore: Add kcmp.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add kcmp.test.
---
 tests/.gitignore  |    1 +
 tests/Makefile.am |    2 +
 tests/kcmp.c      |  106 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/kcmp.test   |    6 +++
 4 files changed, 115 insertions(+)
 create mode 100644 tests/kcmp.c
 create mode 100755 tests/kcmp.test

diff --git a/tests/.gitignore b/tests/.gitignore
index 76d49dc..52af647 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -123,6 +123,7 @@ ipc_msg
 ipc_msgbuf
 ipc_sem
 ipc_shm
+kcmp
 keyctl
 kill
 ksysent
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e9b2a13..69423c0 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -183,6 +183,7 @@ check_PROGRAMS = \
 	ipc_msgbuf \
 	ipc_sem \
 	ipc_shm \
+	kcmp \
 	keyctl \
 	kill \
 	ksysent \
@@ -536,6 +537,7 @@ DECODER_TESTS = \
 	ipc_msgbuf.test \
 	ipc_sem.test \
 	ipc_shm.test \
+	kcmp.test \
 	keyctl.test \
 	kill.test \
 	lchown.test \
diff --git a/tests/kcmp.c b/tests/kcmp.c
new file mode 100644
index 0000000..69dd476
--- /dev/null
+++ b/tests/kcmp.c
@@ -0,0 +1,106 @@
+/*
+ * Check decoding of kcmp 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_kcmp
+
+# include <errno.h>
+# include <stdio.h>
+# include <unistd.h>
+
+# include "kernel_types.h"
+
+# define KCMP_FILE     0
+# define KCMP_SYSVSEM  6
+
+static void
+do_kcmp(kernel_ulong_t pid1, kernel_ulong_t pid2, kernel_ulong_t type,
+	const char *type_str, kernel_ulong_t idx1, kernel_ulong_t idx2)
+{
+	long rc;
+	int saved_errno;
+
+	rc = syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
+	saved_errno = errno;
+
+	printf("kcmp(%d, %d, ", (int) pid1, (int) pid2);
+
+	if (type_str)
+		printf("%s", type_str);
+	else
+		printf("%#x /* KCMP_??? */", (int) type);
+
+	if (type == KCMP_FILE)
+		printf(", %u, %u", (unsigned) idx1, (unsigned) idx2);
+	else if (type > KCMP_SYSVSEM)
+		printf(", %#llx, %#llx",
+		       (unsigned long long) idx1, (unsigned long long) idx2);
+
+	errno = saved_errno;
+	printf(") = %s\n", sprintrc(rc));
+}
+
+int
+main(void)
+{
+	static const kernel_ulong_t bogus_pid1 =
+		(kernel_ulong_t) 0xdeadca75face1057ULL;
+	static const kernel_ulong_t bogus_pid2 =
+		(kernel_ulong_t) 0xdefaced1defaced2ULL;
+	static const kernel_ulong_t bogus_type =
+		(kernel_ulong_t) 0xbadc0dedda7adeadULL;
+	static const kernel_ulong_t bogus_idx1 =
+		(kernel_ulong_t) 0xdec0ded3dec0ded4ULL;
+	static const kernel_ulong_t bogus_idx2 =
+		(kernel_ulong_t) 0xba5e1e55deadc0deULL;
+
+	/* Invalid values */
+	do_kcmp(bogus_pid1, bogus_pid2, bogus_type, NULL, bogus_idx1,
+		bogus_idx2);
+	do_kcmp(0, 0, KCMP_SYSVSEM + 1, NULL, 0, 0);
+
+	/* KCMP_FILE is the only type which has additional args */
+	do_kcmp(3141592653U, 2718281828U, ARG_STR(KCMP_FILE), bogus_idx1,
+		bogus_idx2);
+	/* Some type without additional args */
+	do_kcmp(-1, -1, ARG_STR(KCMP_SYSVSEM), bogus_idx1, bogus_idx2);
+
+	puts("+++ exited with 0 +++");
+
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_kcmp");
+
+#endif
diff --git a/tests/kcmp.test b/tests/kcmp.test
new file mode 100755
index 0000000..dcf901f
--- /dev/null
+++ b/tests/kcmp.test
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check decoding of kcmp syscall.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a25
-- 
1.7.10.4