[PATCH 03/15] tests: Check decoding of lookup_dcookie syscall

[Eugene Syromyatnikov]

* tests/lookup_dcookie.c: New file.
* tests/lookup_dcookie.test: New test.
* tests/.gitignore: Add lookup_dcookie.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add lookup_dcookie.test.
---
 tests/.gitignore          |    1 +
 tests/Makefile.am         |    2 +
 tests/lookup_dcookie.c    |  101 +++++++++++++++++++++++++++++++++++++++++++++
 tests/lookup_dcookie.test |    6 +++
 4 files changed, 110 insertions(+)
 create mode 100644 tests/lookup_dcookie.c
 create mode 100755 tests/lookup_dcookie.test

diff --git a/tests/.gitignore b/tests/.gitignore
index b2c5434..e7b0dc6 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -131,6 +131,7 @@ libtests.a
 link
 linkat
 llseek
+lookup_dcookie
 lseek
 lstat
 lstat64
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 61b6db7..3401b89 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -189,6 +189,7 @@ check_PROGRAMS = \
 	link \
 	linkat \
 	llseek \
+	lookup_dcookie \
 	lseek \
 	lstat \
 	lstat64 \
@@ -538,6 +539,7 @@ DECODER_TESTS = \
 	link.test \
 	linkat.test \
 	llseek.test \
+	lookup_dcookie.test \
 	lseek.test \
 	lstat.test \
 	lstat64.test \
diff --git a/tests/lookup_dcookie.c b/tests/lookup_dcookie.c
new file mode 100644
index 0000000..1b6ab71
--- /dev/null
+++ b/tests/lookup_dcookie.c
@@ -0,0 +1,101 @@
+/*
+ * Check decoding of lookup_dcookie 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_lookup_dcookie
+
+# include <errno.h>
+# include <inttypes.h>
+# include <limits.h>
+# include <stdio.h>
+# include <unistd.h>
+
+# include "kernel_types.h"
+
+
+static void
+do_lookup_cookie(uint64_t cookie, char *buf, kernel_ulong_t len)
+{
+	long rc;
+	int saved_errno;
+
+# if (LONG_MAX > INT_MAX) \
+  || (defined __x86_64__ && defined __ILP32__) \
+  || defined LINUX_MIPSN32
+	rc = syscall(__NR_lookup_dcookie, cookie, buf, len);
+# else
+	rc = syscall(__NR_lookup_dcookie, LL_VAL_TO_PAIR(cookie), buf, len);
+# endif
+
+	saved_errno = errno;
+	printf("lookup_dcookie(%" PRIu64 ", ", cookie);
+
+	/* Here, we trust successful return code */
+	if ((rc >= 0) && (rc < (long) INT_MAX)) {
+		printf("%.*s, ", (int) rc, buf);
+	} else {
+		if (buf != NULL)
+			printf("%p, ", buf);
+		else
+			printf("NULL, ");
+	}
+
+	errno = saved_errno;
+	printf("%" PRIu64 ") = %s\n", (uint64_t) len, sprintrc(rc));
+}
+
+int
+main(void)
+{
+	enum { BUF_SIZE = 4096 };
+
+	static const uint64_t bogus_cookie =
+		(uint64_t) 0xf157feeddeadfaceULL;
+	static const kernel_ulong_t bogus_len =
+		(kernel_ulong_t) 0xbadc0dedda7a1057ULL;
+
+	char *buf = tail_alloc(BUF_SIZE);
+
+	do_lookup_cookie(0, NULL, 0);
+	do_lookup_cookie(bogus_cookie, buf + BUF_SIZE, bogus_len);
+	do_lookup_cookie(bogus_cookie, buf, BUF_SIZE);
+
+	puts("+++ exited with 0 +++");
+
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_lookup_dcookie");
+
+#endif
diff --git a/tests/lookup_dcookie.test b/tests/lookup_dcookie.test
new file mode 100755
index 0000000..ae8495b
--- /dev/null
+++ b/tests/lookup_dcookie.test
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check decoding of lookup_cookie syscall.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a25
-- 
1.7.10.4