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Message-ID: <20241116005058.69091-1-jeffxu@chromium.org>
Date: Sat, 16 Nov 2024 00:50:58 +0000
From: jeffxu@...omium.org
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
linux-mm@...ck.org,
Jeff Xu <jeffxu@...omium.org>
Subject: [PATCH v1] selftest/mm: remove seal_elf
From: Jeff Xu <jeffxu@...omium.org>
Remove seal_elf, which is a demo of mseal, we
no longer need this.
Signed-off-by: Jeff Xu <jeffxu@...omium.org>
---
tools/testing/selftests/mm/.gitignore | 1 -
tools/testing/selftests/mm/Makefile | 1 -
tools/testing/selftests/mm/seal_elf.c | 137 --------------------------
3 files changed, 139 deletions(-)
delete mode 100644 tools/testing/selftests/mm/seal_elf.c
diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore
index 8f01f4da1c0d..6a273bdbc70b 100644
--- a/tools/testing/selftests/mm/.gitignore
+++ b/tools/testing/selftests/mm/.gitignore
@@ -49,7 +49,6 @@ va_high_addr_switch
hugetlb_fault_after_madv
hugetlb_madv_vs_map
mseal_test
-seal_elf
droppable
hugetlb_dio
pkey_sighandler_tests_32
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index 72ec4403032d..869b6a40f290 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -64,7 +64,6 @@ TEST_GEN_FILES += mrelease_test
TEST_GEN_FILES += mremap_dontunmap
TEST_GEN_FILES += mremap_test
TEST_GEN_FILES += mseal_test
-TEST_GEN_FILES += seal_elf
TEST_GEN_FILES += on-fault-limit
TEST_GEN_FILES += pagemap_ioctl
TEST_GEN_FILES += thuge-gen
diff --git a/tools/testing/selftests/mm/seal_elf.c b/tools/testing/selftests/mm/seal_elf.c
deleted file mode 100644
index d9f8ba8d5050..000000000000
--- a/tools/testing/selftests/mm/seal_elf.c
+++ /dev/null
@@ -1,137 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#define _GNU_SOURCE
-#include <sys/mman.h>
-#include <stdint.h>
-#include <asm-generic/unistd.h>
-#include <string.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <stdbool.h>
-#include "../kselftest.h"
-#include <syscall.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <sys/ioctl.h>
-#include <sys/vfs.h>
-#include <sys/stat.h>
-#include "mseal_helpers.h"
-
-/*
- * define sys_xyx to call syscall directly.
- */
-static int sys_mseal(void *start, size_t len)
-{
- int sret;
-
- errno = 0;
- sret = syscall(__NR_mseal, start, len, 0);
- return sret;
-}
-
-static inline int sys_mprotect(void *ptr, size_t size, unsigned long prot)
-{
- int sret;
-
- errno = 0;
- sret = syscall(__NR_mprotect, ptr, size, prot);
- return sret;
-}
-
-static bool seal_support(void)
-{
- int ret;
- void *ptr;
- unsigned long page_size = getpagesize();
-
- ptr = mmap(NULL, page_size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
- if (ptr == (void *) -1)
- return false;
-
- ret = sys_mseal(ptr, page_size);
- if (ret < 0)
- return false;
-
- return true;
-}
-
-const char somestr[4096] = {"READONLY"};
-
-static void test_seal_elf(void)
-{
- int ret;
- FILE *maps;
- char line[512];
- uintptr_t addr_start, addr_end;
- char prot[5];
- char filename[256];
- unsigned long page_size = getpagesize();
- unsigned long long ptr = (unsigned long long) somestr;
- char *somestr2 = (char *)somestr;
-
- /*
- * Modify the protection of readonly somestr
- */
- if (((unsigned long long)ptr % page_size) != 0)
- ptr = (unsigned long long)ptr & ~(page_size - 1);
-
- ksft_print_msg("somestr = %s\n", somestr);
- ksft_print_msg("change protection to rw\n");
- ret = sys_mprotect((void *)ptr, page_size, PROT_READ|PROT_WRITE);
- FAIL_TEST_IF_FALSE(!ret);
- *somestr2 = 'A';
- ksft_print_msg("somestr is modified to: %s\n", somestr);
- ret = sys_mprotect((void *)ptr, page_size, PROT_READ);
- FAIL_TEST_IF_FALSE(!ret);
-
- maps = fopen("/proc/self/maps", "r");
- FAIL_TEST_IF_FALSE(maps);
-
- /*
- * apply sealing to elf binary
- */
- while (fgets(line, sizeof(line), maps)) {
- if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*u %255[^\n]",
- &addr_start, &addr_end, prot, filename) == 4) {
- if (strlen(filename)) {
- /*
- * seal the mapping if read only.
- */
- if (strstr(prot, "r-")) {
- ret = sys_mseal((void *)addr_start, addr_end - addr_start);
- FAIL_TEST_IF_FALSE(!ret);
- ksft_print_msg("sealed: %lx-%lx %s %s\n",
- addr_start, addr_end, prot, filename);
- if ((uintptr_t) somestr >= addr_start &&
- (uintptr_t) somestr <= addr_end)
- ksft_print_msg("mapping for somestr found\n");
- }
- }
- }
- }
- fclose(maps);
-
- ret = sys_mprotect((void *)ptr, page_size, PROT_READ | PROT_WRITE);
- FAIL_TEST_IF_FALSE(ret < 0);
- ksft_print_msg("somestr is sealed, mprotect is rejected\n");
-
- REPORT_TEST_PASS();
-}
-
-int main(int argc, char **argv)
-{
- bool test_seal = seal_support();
-
- ksft_print_header();
- ksft_print_msg("pid=%d\n", getpid());
-
- if (!test_seal)
- ksft_exit_skip("sealing not supported, check CONFIG_64BIT\n");
-
- ksft_set_plan(1);
-
- test_seal_elf();
-
- ksft_finished();
-}
--
2.47.0.338.g60cca15819-goog
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