cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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task_local_storage.c (2287B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2021 Facebook */
      3
      4#define _GNU_SOURCE         /* See feature_test_macros(7) */
      5#include <unistd.h>
      6#include <sys/syscall.h>   /* For SYS_xxx definitions */
      7#include <sys/types.h>
      8#include <test_progs.h>
      9#include "task_local_storage.skel.h"
     10#include "task_local_storage_exit_creds.skel.h"
     11#include "task_ls_recursion.skel.h"
     12
     13static void test_sys_enter_exit(void)
     14{
     15	struct task_local_storage *skel;
     16	int err;
     17
     18	skel = task_local_storage__open_and_load();
     19	if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
     20		return;
     21
     22	skel->bss->target_pid = syscall(SYS_gettid);
     23
     24	err = task_local_storage__attach(skel);
     25	if (!ASSERT_OK(err, "skel_attach"))
     26		goto out;
     27
     28	syscall(SYS_gettid);
     29	syscall(SYS_gettid);
     30
     31	/* 3x syscalls: 1x attach and 2x gettid */
     32	ASSERT_EQ(skel->bss->enter_cnt, 3, "enter_cnt");
     33	ASSERT_EQ(skel->bss->exit_cnt, 3, "exit_cnt");
     34	ASSERT_EQ(skel->bss->mismatch_cnt, 0, "mismatch_cnt");
     35out:
     36	task_local_storage__destroy(skel);
     37}
     38
     39static void test_exit_creds(void)
     40{
     41	struct task_local_storage_exit_creds *skel;
     42	int err;
     43
     44	skel = task_local_storage_exit_creds__open_and_load();
     45	if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
     46		return;
     47
     48	err = task_local_storage_exit_creds__attach(skel);
     49	if (!ASSERT_OK(err, "skel_attach"))
     50		goto out;
     51
     52	/* trigger at least one exit_creds() */
     53	if (CHECK_FAIL(system("ls > /dev/null")))
     54		goto out;
     55
     56	/* sync rcu to make sure exit_creds() is called for "ls" */
     57	kern_sync_rcu();
     58	ASSERT_EQ(skel->bss->valid_ptr_count, 0, "valid_ptr_count");
     59	ASSERT_NEQ(skel->bss->null_ptr_count, 0, "null_ptr_count");
     60out:
     61	task_local_storage_exit_creds__destroy(skel);
     62}
     63
     64static void test_recursion(void)
     65{
     66	struct task_ls_recursion *skel;
     67	int err;
     68
     69	skel = task_ls_recursion__open_and_load();
     70	if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
     71		return;
     72
     73	err = task_ls_recursion__attach(skel);
     74	if (!ASSERT_OK(err, "skel_attach"))
     75		goto out;
     76
     77	/* trigger sys_enter, make sure it does not cause deadlock */
     78	syscall(SYS_gettid);
     79
     80out:
     81	task_ls_recursion__destroy(skel);
     82}
     83
     84void test_task_local_storage(void)
     85{
     86	if (test__start_subtest("sys_enter_exit"))
     87		test_sys_enter_exit();
     88	if (test__start_subtest("exit_creds"))
     89		test_exit_creds();
     90	if (test__start_subtest("recursion"))
     91		test_recursion();
     92}