From: Ivan Orlov <ivan.orlov0322@gmail.com>
To: shuah@kernel.org,
	colin.i.king@gmail.com
Subject: [PATCH v2] selftests: prctl: Add new prctl test for PR_SET_VMA action
Date: Sun, 26 Mar 2023 00:59:02 +0400
Message-Id: <20230325205903.5550-1-ivan.orlov0322@gmail.com>
MIME-Version: 1.0
Cc: linux-kernel-mentees@lists.linuxfoundation.org,
 Ivan Orlov <ivan.orlov0322@gmail.com>, linux-kernel@vger.kernel.org,
 linux-kselftest@vger.kernel.org
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This patch will add the new test, which covers the prctl call with
PR_SET_VMA command. The test tries to give a name to the anonymous
VMA within the process memory map, and then checks the result of
the operation by parsing 'maps' virtual file.

Additionally, the test tries to call the prctl PR_SET_VMA command
with invalid arguments, and checks the error codes for correctness.

At the moment anonymous VMA naming through prctl call functionality
is not covered with any tests, so I think implementing it makes sense.

In version 2 of this patch I consider the selftest Makefile rule about
TARGETS entries order - I moved the 'prctl' entry in the Makefile to
follow the lexicographic order. In version 1 it was placed at the
end of the list.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
---
 tools/testing/selftests/Makefile              |   1 +
 tools/testing/selftests/prctl/.gitignore      |   1 +
 tools/testing/selftests/prctl/Makefile        |   2 +-
 tools/testing/selftests/prctl/config          |   1 +
 .../selftests/prctl/set-anon-vma-name-test.c  | 104 ++++++++++++++++++
 5 files changed, 108 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/prctl/config
 create mode 100644 tools/testing/selftests/prctl/set-anon-vma-name-test.c

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 13a6837a0c6b..97dcdaa656f6 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -58,6 +58,7 @@ TARGETS += nsfs
 TARGETS += pidfd
 TARGETS += pid_namespace
 TARGETS += powerpc
+TARGETS += prctl
 TARGETS += proc
 TARGETS += pstore
 TARGETS += ptrace
diff --git a/tools/testing/selftests/prctl/.gitignore b/tools/testing/selftests/prctl/.gitignore
index 91af2b631bc9..7a657b25f686 100644
--- a/tools/testing/selftests/prctl/.gitignore
+++ b/tools/testing/selftests/prctl/.gitignore
@@ -2,3 +2,4 @@
 disable-tsc-ctxt-sw-stress-test
 disable-tsc-on-off-stress-test
 disable-tsc-test
+set-anon-vma-name-test
diff --git a/tools/testing/selftests/prctl/Makefile b/tools/testing/selftests/prctl/Makefile
index c7923b205222..c058b81eeb41 100644
--- a/tools/testing/selftests/prctl/Makefile
+++ b/tools/testing/selftests/prctl/Makefile
@@ -5,7 +5,7 @@ ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
 ifeq ($(ARCH),x86)
 TEST_PROGS := disable-tsc-ctxt-sw-stress-test disable-tsc-on-off-stress-test \
-		disable-tsc-test
+		disable-tsc-test set-anon-vma-name-test
 all: $(TEST_PROGS)
 
 include ../lib.mk
diff --git a/tools/testing/selftests/prctl/config b/tools/testing/selftests/prctl/config
new file mode 100644
index 000000000000..c6ed03c544e5
--- /dev/null
+++ b/tools/testing/selftests/prctl/config
@@ -0,0 +1 @@
+CONFIG_ANON_VMA_NAME=y
diff --git a/tools/testing/selftests/prctl/set-anon-vma-name-test.c b/tools/testing/selftests/prctl/set-anon-vma-name-test.c
new file mode 100644
index 000000000000..26d853c5a0c1
--- /dev/null
+++ b/tools/testing/selftests/prctl/set-anon-vma-name-test.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This test covers the anonymous VMA naming functionality through prctl calls
+ */
+
+#include <errno.h>
+#include <sys/prctl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <string.h>
+
+#include "../kselftest_harness.h"
+
+#define AREA_SIZE 1024
+
+#define GOOD_NAME "goodname"
+#define BAD_NAME "badname\1"
+
+#ifndef PR_SET_VMA
+#define PR_SET_VMA 0x53564d41
+#define PR_SET_VMA_ANON_NAME 0
+#endif
+
+
+int rename_vma(unsigned long addr, unsigned long size, char *name)
+{
+	int res;
+
+	res = prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, addr, size, name);
+	if (res < 0)
+		return -errno;
+	return res;
+}
+
+int was_renaming_successful(char *target_name, unsigned long ptr)
+{
+	FILE *maps_file;
+
+	char line_buf[512], name[128], mode[8];
+	unsigned long start_addr, end_addr, offset;
+	unsigned int major_id, minor_id, node_id;
+
+	char target_buf[128];
+	int res = 0, sscanf_res;
+
+	// The entry name in maps will be in format [anon:<target_name>]
+	sprintf(target_buf, "[anon:%s]", target_name);
+	maps_file = fopen("/proc/self/maps", "r");
+	if (!maps_file) {
+		printf("## /proc/self/maps file opening error\n");
+		return 0;
+	}
+
+	// Parse the maps file to find the entry we renamed
+	while (fgets(line_buf, sizeof(line_buf), maps_file)) {
+		sscanf_res = sscanf(line_buf, "%lx-%lx %7s %lx %u:%u %u %s", &start_addr,
+					&end_addr, mode, &offset, &major_id,
+					&minor_id, &node_id, name);
+		if (sscanf_res == EOF) {
+			res = 0;
+			printf("## EOF while parsing the maps file\n");
+			break;
+		}
+		if (!strcmp(name, target_buf) && start_addr == ptr) {
+			res = 1;
+			break;
+		}
+	}
+	fclose(maps_file);
+	return res;
+}
+
+FIXTURE(vma) {
+	void *ptr_anon, *ptr_not_anon;
+};
+
+FIXTURE_SETUP(vma) {
+	self->ptr_anon = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE,
+					MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+	ASSERT_NE(self->ptr_anon, NULL);
+	self->ptr_not_anon = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE,
+					MAP_PRIVATE, 0, 0);
+	ASSERT_NE(self->ptr_not_anon, NULL);
+}
+
+FIXTURE_TEARDOWN(vma) {
+	munmap(self->ptr_anon, AREA_SIZE);
+	munmap(self->ptr_not_anon, AREA_SIZE);
+}
+
+TEST_F(vma, renaming) {
+	TH_LOG("Try to rename the VMA with correct parameters");
+	EXPECT_GE(rename_vma((unsigned long)self->ptr_anon, AREA_SIZE, GOOD_NAME), 0);
+	EXPECT_TRUE(was_renaming_successful(GOOD_NAME, (unsigned long)self->ptr_anon));
+
+	TH_LOG("Try to pass invalid name (with non-printable character \\1) to rename the VMA");
+	EXPECT_EQ(rename_vma((unsigned long)self->ptr_anon, AREA_SIZE, BAD_NAME), -EINVAL);
+
+	TH_LOG("Try to rename non-anonynous VMA");
+	EXPECT_EQ(rename_vma((unsigned long) self->ptr_not_anon, AREA_SIZE, GOOD_NAME), -EINVAL);
+}
+
+TEST_HARNESS_MAIN
-- 
2.34.1

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