tests: check decoding of prctl PR_GET_TID_ADDRESS operation

* tests/prctl-tid_address.c: New file.
* tests/prctl-tid_address.test: New test.
* tests/.gitignore: Add prctl-tid_address.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add prctl-tid_address.test.

tests/.gitignore

@@ -218,6 +218,7 @@ prctl-pdeathsig
 prctl-seccomp-filter-v
 prctl-seccomp-strict
 prctl-securebits
+prctl-tid_address
 prctl-tsc
 pread64-pwrite64
 preadv

tests/Makefile.am

@@ -278,6 +278,7 @@ check_PROGRAMS = \
 	prctl-seccomp-filter-v \
 	prctl-seccomp-strict \
 	prctl-securebits \
+	prctl-tid_address \
 	prctl-tsc \
 	pread64-pwrite64 \
 	preadv \
@@ -667,6 +668,7 @@ DECODER_TESTS = \
 	prctl-seccomp-filter-v.test \
 	prctl-seccomp-strict.test \
 	prctl-securebits.test \
+	prctl-tid_address.test \
 	prctl-tsc.test \
 	pread64-pwrite64.test \
 	preadv-pwritev.test \

tests/prctl-tid_address.c

@@ -0,0 +1,103 @@
+/*
+ * Check decoding of prctl PR_GET_TID_ADDRESS operation.
+ *
+ * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@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>
+#include <linux/prctl.h>
+
+#if defined __NR_prctl && defined __NR_set_tid_address && \
+	defined PR_GET_TID_ADDRESS
+
+# include <inttypes.h>
+# include <stdio.h>
+# include <unistd.h>
+
+static const char *
+sprintaddr(kernel_ulong_t addr)
+{
+	static char buf[sizeof("0x") + sizeof(addr) * 2];
+
+	if (addr) {
+		snprintf(buf, sizeof(buf), "%#llx", (unsigned long long) addr);
+
+		return buf;
+	}
+
+	return "NULL";
+}
+
+int
+main(void)
+{
+	static const kernel_ulong_t bogus_addr =
+		(kernel_ulong_t) 0xfffffffffffffffdULL;
+
+	/* Note that kernel puts kernel-sized pointer even on x32 */
+	kernel_ulong_t *ptr = tail_alloc(sizeof(*ptr));
+	long rc;
+	long set_ok;
+
+	*ptr = (kernel_ulong_t) 0xbadc0dedda7a1057ULL;
+
+	rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, NULL);
+	printf("prctl(PR_GET_TID_ADDRESS, NULL) = %s\n", sprintrc(rc));
+
+	rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, bogus_addr);
+	printf("prctl(PR_GET_TID_ADDRESS, %#llx) = %s\n",
+	       (unsigned long long) bogus_addr, sprintrc(rc));
+
+	rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr);
+	if (rc) {
+		printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n",
+		       ptr, sprintrc(rc));
+	} else {
+		printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n",
+		       sprintaddr(*ptr), sprintrc(rc));
+	}
+
+	set_ok = syscall(__NR_set_tid_address, bogus_addr);
+
+	rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr);
+	if (rc) {
+		printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n",
+		       ptr, sprintrc(rc));
+	} else {
+		printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n",
+		       sprintaddr(set_ok ? bogus_addr : *ptr), sprintrc(rc));
+	}
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_prctl && __NR_set_tid_address && PR_GET_TID_ADDRESS")
+
+#endif

tests/prctl-tid_address.test

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Check decoding of prctl PR_GET_TID_ADDRESS operation.
+. "${srcdir=.}/init.sh"
+
+check_prog grep
+run_prog > /dev/null
+run_strace -a23 -eprctl $args > "$EXP"
+LC_ALL=C grep -Ev '^prctl\(PR_[GS]ET_([^T]|.[^I]|..[^D])' < "$LOG" > "$OUT"
+match_diff "$OUT" "$EXP"
+
+rm -f "$EXP" "$OUT"