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authorAmit Daniel Kachhap <amit.kachhap@arm.com>2020-10-02 14:56:27 +0300
committerWill Deacon <will@kernel.org>2020-10-05 20:52:17 +0300
commitdfe537cf47186bfb59db3e57eed7417cd5efde17 (patch)
treef01b485da31100c51fe3426f3ecb26dbd8a46651
parentf3b2a26ca78da2ef36cf76d5511e3c94baee96a1 (diff)
downloadlinux-dfe537cf47186bfb59db3e57eed7417cd5efde17.tar.xz
kselftest/arm64: Check forked child mte memory accessibility
This test covers the mte memory behaviour of the forked process with different mapping properties and flags. It checks that all bytes of forked child memory are accessible with the same tag as that of the parent and memory accessed outside the tag range causes fault to occur. Co-developed-by: Gabor Kertesz <gabor.kertesz@arm.com> Signed-off-by: Gabor Kertesz <gabor.kertesz@arm.com> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20201002115630.24683-4-amit.kachhap@arm.com Signed-off-by: Will Deacon <will@kernel.org>
-rw-r--r--tools/testing/selftests/arm64/mte/.gitignore1
-rw-r--r--tools/testing/selftests/arm64/mte/check_child_memory.c195
2 files changed, 196 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/mte/.gitignore b/tools/testing/selftests/arm64/mte/.gitignore
index c3fca255d3d6..b5fcc0fb4d97 100644
--- a/tools/testing/selftests/arm64/mte/.gitignore
+++ b/tools/testing/selftests/arm64/mte/.gitignore
@@ -1,2 +1,3 @@
check_buffer_fill
check_tags_inclusion
+check_child_memory
diff --git a/tools/testing/selftests/arm64/mte/check_child_memory.c b/tools/testing/selftests/arm64/mte/check_child_memory.c
new file mode 100644
index 000000000000..97bebdecd29e
--- /dev/null
+++ b/tools/testing/selftests/arm64/mte/check_child_memory.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 ARM Limited
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ucontext.h>
+#include <sys/wait.h>
+
+#include "kselftest.h"
+#include "mte_common_util.h"
+#include "mte_def.h"
+
+#define BUFFER_SIZE (5 * MT_GRANULE_SIZE)
+#define RUNS (MT_TAG_COUNT)
+#define UNDERFLOW MT_GRANULE_SIZE
+#define OVERFLOW MT_GRANULE_SIZE
+
+static size_t page_size;
+static int sizes[] = {
+ 1, 537, 989, 1269, MT_GRANULE_SIZE - 1, MT_GRANULE_SIZE,
+ /* page size - 1*/ 0, /* page_size */ 0, /* page size + 1 */ 0
+};
+
+static int check_child_tag_inheritance(char *ptr, int size, int mode)
+{
+ int i, parent_tag, child_tag, fault, child_status;
+ pid_t child;
+
+ parent_tag = MT_FETCH_TAG((uintptr_t)ptr);
+ fault = 0;
+
+ child = fork();
+ if (child == -1) {
+ ksft_print_msg("FAIL: child process creation\n");
+ return KSFT_FAIL;
+ } else if (child == 0) {
+ mte_initialize_current_context(mode, (uintptr_t)ptr, size);
+ /* Do copy on write */
+ memset(ptr, '1', size);
+ mte_wait_after_trig();
+ if (cur_mte_cxt.fault_valid == true) {
+ fault = 1;
+ goto check_child_tag_inheritance_err;
+ }
+ for (i = 0 ; i < size ; i += MT_GRANULE_SIZE) {
+ child_tag = MT_FETCH_TAG((uintptr_t)(mte_get_tag_address(ptr + i)));
+ if (parent_tag != child_tag) {
+ ksft_print_msg("FAIL: child mte tag mismatch\n");
+ fault = 1;
+ goto check_child_tag_inheritance_err;
+ }
+ }
+ mte_initialize_current_context(mode, (uintptr_t)ptr, -UNDERFLOW);
+ memset(ptr - UNDERFLOW, '2', UNDERFLOW);
+ mte_wait_after_trig();
+ if (cur_mte_cxt.fault_valid == false) {
+ fault = 1;
+ goto check_child_tag_inheritance_err;
+ }
+ mte_initialize_current_context(mode, (uintptr_t)ptr, size + OVERFLOW);
+ memset(ptr + size, '3', OVERFLOW);
+ mte_wait_after_trig();
+ if (cur_mte_cxt.fault_valid == false) {
+ fault = 1;
+ goto check_child_tag_inheritance_err;
+ }
+check_child_tag_inheritance_err:
+ _exit(fault);
+ }
+ /* Wait for child process to terminate */
+ wait(&child_status);
+ if (WIFEXITED(child_status))
+ fault = WEXITSTATUS(child_status);
+ else
+ fault = 1;
+ return (fault) ? KSFT_FAIL : KSFT_PASS;
+}
+
+static int check_child_memory_mapping(int mem_type, int mode, int mapping)
+{
+ char *ptr;
+ int run, result;
+ int item = sizeof(sizes)/sizeof(int);
+
+ item = sizeof(sizes)/sizeof(int);
+ mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
+ for (run = 0; run < item; run++) {
+ ptr = (char *)mte_allocate_memory_tag_range(sizes[run], mem_type, mapping,
+ UNDERFLOW, OVERFLOW);
+ if (check_allocated_memory_range(ptr, sizes[run], mem_type,
+ UNDERFLOW, OVERFLOW) != KSFT_PASS)
+ return KSFT_FAIL;
+ result = check_child_tag_inheritance(ptr, sizes[run], mode);
+ mte_free_memory_tag_range((void *)ptr, sizes[run], mem_type, UNDERFLOW, OVERFLOW);
+ if (result == KSFT_FAIL)
+ return result;
+ }
+ return KSFT_PASS;
+}
+
+static int check_child_file_mapping(int mem_type, int mode, int mapping)
+{
+ char *ptr, *map_ptr;
+ int run, fd, map_size, result = KSFT_PASS;
+ int total = sizeof(sizes)/sizeof(int);
+
+ mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
+ for (run = 0; run < total; run++) {
+ fd = create_temp_file();
+ if (fd == -1)
+ return KSFT_FAIL;
+
+ map_size = sizes[run] + OVERFLOW + UNDERFLOW;
+ map_ptr = (char *)mte_allocate_file_memory(map_size, mem_type, mapping, false, fd);
+ if (check_allocated_memory(map_ptr, map_size, mem_type, false) != KSFT_PASS) {
+ close(fd);
+ return KSFT_FAIL;
+ }
+ ptr = map_ptr + UNDERFLOW;
+ mte_initialize_current_context(mode, (uintptr_t)ptr, sizes[run]);
+ /* Only mte enabled memory will allow tag insertion */
+ ptr = mte_insert_tags((void *)ptr, sizes[run]);
+ if (!ptr || cur_mte_cxt.fault_valid == true) {
+ ksft_print_msg("FAIL: Insert tags on file based memory\n");
+ munmap((void *)map_ptr, map_size);
+ close(fd);
+ return KSFT_FAIL;
+ }
+ result = check_child_tag_inheritance(ptr, sizes[run], mode);
+ mte_clear_tags((void *)ptr, sizes[run]);
+ munmap((void *)map_ptr, map_size);
+ close(fd);
+ if (result != KSFT_PASS)
+ return KSFT_FAIL;
+ }
+ return KSFT_PASS;
+}
+
+int main(int argc, char *argv[])
+{
+ int err;
+ int item = sizeof(sizes)/sizeof(int);
+
+ page_size = getpagesize();
+ if (!page_size) {
+ ksft_print_msg("ERR: Unable to get page size\n");
+ return KSFT_FAIL;
+ }
+ sizes[item - 3] = page_size - 1;
+ sizes[item - 2] = page_size;
+ sizes[item - 1] = page_size + 1;
+
+ err = mte_default_setup();
+ if (err)
+ return err;
+
+ /* Register SIGSEGV handler */
+ mte_register_signal(SIGSEGV, mte_default_handler);
+ mte_register_signal(SIGBUS, mte_default_handler);
+
+ evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
+ "Check child anonymous memory with private mapping, precise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
+ "Check child anonymous memory with shared mapping, precise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
+ "Check child anonymous memory with private mapping, imprecise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
+ "Check child anonymous memory with shared mapping, imprecise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE),
+ "Check child anonymous memory with private mapping, precise mode and mmap/mprotect memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_SHARED),
+ "Check child anonymous memory with shared mapping, precise mode and mmap/mprotect memory\n");
+
+ evaluate_test(check_child_file_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
+ "Check child file memory with private mapping, precise mode and mmap memory\n");
+ evaluate_test(check_child_file_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
+ "Check child file memory with shared mapping, precise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
+ "Check child file memory with private mapping, imprecise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
+ "Check child file memory with shared mapping, imprecise mode and mmap memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE),
+ "Check child file memory with private mapping, precise mode and mmap/mprotect memory\n");
+ evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_SHARED),
+ "Check child file memory with shared mapping, precise mode and mmap/mprotect memory\n");
+
+ mte_restore_setup();
+ ksft_print_cnts();
+ return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
+}