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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ns_current_pid_tgid.c (2205B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
      3
      4#define _GNU_SOURCE
      5#include <test_progs.h>
      6#include "test_ns_current_pid_tgid.skel.h"
      7#include <sys/stat.h>
      8#include <sys/types.h>
      9#include <unistd.h>
     10#include <sys/syscall.h>
     11#include <sched.h>
     12#include <sys/wait.h>
     13#include <sys/mount.h>
     14#include <sys/fcntl.h>
     15
     16#define STACK_SIZE (1024 * 1024)
     17static char child_stack[STACK_SIZE];
     18
     19static int test_current_pid_tgid(void *args)
     20{
     21	struct test_ns_current_pid_tgid__bss  *bss;
     22	struct test_ns_current_pid_tgid *skel;
     23	int err = -1, duration = 0;
     24	pid_t tgid, pid;
     25	struct stat st;
     26
     27	skel = test_ns_current_pid_tgid__open_and_load();
     28	if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
     29		goto cleanup;
     30
     31	pid = syscall(SYS_gettid);
     32	tgid = getpid();
     33
     34	err = stat("/proc/self/ns/pid", &st);
     35	if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err))
     36		goto cleanup;
     37
     38	bss = skel->bss;
     39	bss->dev = st.st_dev;
     40	bss->ino = st.st_ino;
     41	bss->user_pid = 0;
     42	bss->user_tgid = 0;
     43
     44	err = test_ns_current_pid_tgid__attach(skel);
     45	if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
     46		goto cleanup;
     47
     48	/* trigger tracepoint */
     49	usleep(1);
     50	ASSERT_EQ(bss->user_pid, pid, "pid");
     51	ASSERT_EQ(bss->user_tgid, tgid, "tgid");
     52	err = 0;
     53
     54cleanup:
     55	 test_ns_current_pid_tgid__destroy(skel);
     56
     57	return err;
     58}
     59
     60static void test_ns_current_pid_tgid_new_ns(void)
     61{
     62	int wstatus, duration = 0;
     63	pid_t cpid;
     64
     65	/* Create a process in a new namespace, this process
     66	 * will be the init process of this new namespace hence will be pid 1.
     67	 */
     68	cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE,
     69		     CLONE_NEWPID | SIGCHLD, NULL);
     70
     71	if (CHECK(cpid == -1, "clone", "%s\n", strerror(errno)))
     72		return;
     73
     74	if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", "%s\n", strerror(errno)))
     75		return;
     76
     77	if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed"))
     78		return;
     79}
     80
     81/* TODO: use a different tracepoint */
     82void serial_test_ns_current_pid_tgid(void)
     83{
     84	if (test__start_subtest("ns_current_pid_tgid_root_ns"))
     85		test_current_pid_tgid(NULL);
     86	if (test__start_subtest("ns_current_pid_tgid_new_ns"))
     87		test_ns_current_pid_tgid_new_ns();
     88}