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-rw-r--r--tools/testing/selftests/arm64/mte/.gitignore1
-rw-r--r--tools/testing/selftests/arm64/mte/check_user_mem.c111
-rw-r--r--tools/testing/selftests/arm64/mte/mte_common_util.h1
-rw-r--r--tools/testing/selftests/arm64/mte/mte_helper.S14
4 files changed, 127 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/mte/.gitignore b/tools/testing/selftests/arm64/mte/.gitignore
index 44e9bfdaeca6..bc3ac63f3314 100644
--- a/tools/testing/selftests/arm64/mte/.gitignore
+++ b/tools/testing/selftests/arm64/mte/.gitignore
@@ -3,3 +3,4 @@ check_tags_inclusion
check_child_memory
check_mmap_options
check_ksm_options
+check_user_mem
diff --git a/tools/testing/selftests/arm64/mte/check_user_mem.c b/tools/testing/selftests/arm64/mte/check_user_mem.c
new file mode 100644
index 000000000000..594e98e76880
--- /dev/null
+++ b/tools/testing/selftests/arm64/mte/check_user_mem.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 ARM Limited
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ucontext.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include "kselftest.h"
+#include "mte_common_util.h"
+#include "mte_def.h"
+
+static size_t page_sz;
+
+static int check_usermem_access_fault(int mem_type, int mode, int mapping)
+{
+ int fd, i, err;
+ char val = 'A';
+ size_t len, read_len;
+ void *ptr, *ptr_next;
+
+ err = KSFT_FAIL;
+ len = 2 * page_sz;
+ mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
+ fd = create_temp_file();
+ if (fd == -1)
+ return KSFT_FAIL;
+ for (i = 0; i < len; i++)
+ write(fd, &val, sizeof(val));
+ lseek(fd, 0, 0);
+ ptr = mte_allocate_memory(len, mem_type, mapping, true);
+ if (check_allocated_memory(ptr, len, mem_type, true) != KSFT_PASS) {
+ close(fd);
+ return KSFT_FAIL;
+ }
+ mte_initialize_current_context(mode, (uintptr_t)ptr, len);
+ /* Copy from file into buffer with valid tag */
+ read_len = read(fd, ptr, len);
+ mte_wait_after_trig();
+ if (cur_mte_cxt.fault_valid || read_len < len)
+ goto usermem_acc_err;
+ /* Verify same pattern is read */
+ for (i = 0; i < len; i++)
+ if (*(char *)(ptr + i) != val)
+ break;
+ if (i < len)
+ goto usermem_acc_err;
+
+ /* Tag the next half of memory with different value */
+ ptr_next = (void *)((unsigned long)ptr + page_sz);
+ ptr_next = mte_insert_new_tag(ptr_next);
+ mte_set_tag_address_range(ptr_next, page_sz);
+
+ lseek(fd, 0, 0);
+ /* Copy from file into buffer with invalid tag */
+ read_len = read(fd, ptr, len);
+ mte_wait_after_trig();
+ /*
+ * Accessing user memory in kernel with invalid tag should fail in sync
+ * mode without fault but may not fail in async mode as per the
+ * implemented MTE userspace support in Arm64 kernel.
+ */
+ if (mode == MTE_SYNC_ERR &&
+ !cur_mte_cxt.fault_valid && read_len < len) {
+ err = KSFT_PASS;
+ } else if (mode == MTE_ASYNC_ERR &&
+ !cur_mte_cxt.fault_valid && read_len == len) {
+ err = KSFT_PASS;
+ }
+usermem_acc_err:
+ mte_free_memory((void *)ptr, len, mem_type, true);
+ close(fd);
+ return err;
+}
+
+int main(int argc, char *argv[])
+{
+ int err;
+
+ page_sz = getpagesize();
+ if (!page_sz) {
+ ksft_print_msg("ERR: Unable to get page size\n");
+ return KSFT_FAIL;
+ }
+ err = mte_default_setup();
+ if (err)
+ return err;
+ /* Register signal handlers */
+ mte_register_signal(SIGSEGV, mte_default_handler);
+
+ evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
+ "Check memory access from kernel in sync mode, private mapping and mmap memory\n");
+ evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
+ "Check memory access from kernel in sync mode, shared mapping and mmap memory\n");
+
+ evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
+ "Check memory access from kernel in async mode, private mapping and mmap memory\n");
+ evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
+ "Check memory access from kernel in async mode, shared mapping and mmap memory\n");
+
+ mte_restore_setup();
+ ksft_print_cnts();
+ return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
+}
diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.h b/tools/testing/selftests/arm64/mte/mte_common_util.h
index 45160e061a0e..195a7d1879e6 100644
--- a/tools/testing/selftests/arm64/mte/mte_common_util.h
+++ b/tools/testing/selftests/arm64/mte/mte_common_util.h
@@ -64,6 +64,7 @@ int create_temp_file(void);
/* Assembly MTE utility functions */
void *mte_insert_random_tag(void *ptr);
+void *mte_insert_new_tag(void *ptr);
void *mte_get_tag_address(void *ptr);
void mte_set_tag_address_range(void *ptr, int range);
void mte_clear_tag_address_range(void *ptr, int range);
diff --git a/tools/testing/selftests/arm64/mte/mte_helper.S b/tools/testing/selftests/arm64/mte/mte_helper.S
index 48e049fbad9a..a02c04cd0aac 100644
--- a/tools/testing/selftests/arm64/mte/mte_helper.S
+++ b/tools/testing/selftests/arm64/mte/mte_helper.S
@@ -27,6 +27,20 @@ ENTRY(mte_insert_random_tag)
ENDPROC(mte_insert_random_tag)
/*
+ * mte_insert_new_tag: Insert new tag and different from the source tag if
+ * source pointer has it.
+ * Input:
+ * x0 - source pointer with a tag/no-tag
+ * Return:
+ * x0 - pointer with random tag
+ */
+ENTRY(mte_insert_new_tag)
+ gmi x1, x0, xzr
+ irg x0, x0, x1
+ ret
+ENDPROC(mte_insert_new_tag)
+
+/*
* mte_get_tag_address: Get the tag from given address.
* Input:
* x0 - source pointer