@@ -58,6 +58,7 @@ TARGETS += nsfs
TARGETS += pidfd
TARGETS += pid_namespace
TARGETS += powerpc
+TARGETS += prctl
TARGETS += proc
TARGETS += pstore
TARGETS += ptrace
@@ -2,3 +2,4 @@
disable-tsc-ctxt-sw-stress-test
disable-tsc-on-off-stress-test
disable-tsc-test
+set-anon-vma-name-test
@@ -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
new file mode 100644
@@ -0,0 +1 @@
+CONFIG_ANON_VMA_NAME=y
new file mode 100644
@@ -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
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