87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2020 Cyril Hrubis <chrbis@suse.cz>
|
|
*
|
|
* After fix for CVE-2018-1000199 (see ptrace08.c) subsequent calls to POKEUSER
|
|
* for x86 debug registers were ignored silently.
|
|
*
|
|
* This is a regression test for commit:
|
|
*
|
|
* commit bd14406b78e6daa1ea3c1673bda1ffc9efdeead0
|
|
* Author: Jiri Olsa <jolsa@kernel.org>
|
|
* Date: Mon Aug 27 11:12:25 2018 +0200
|
|
*
|
|
* perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stddef.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/user.h>
|
|
#include <signal.h>
|
|
#include "tst_test.h"
|
|
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
|
|
static pid_t child_pid;
|
|
|
|
static void child_main(void)
|
|
{
|
|
raise(SIGSTOP);
|
|
exit(0);
|
|
}
|
|
|
|
static void run(void)
|
|
{
|
|
int status;
|
|
unsigned long addr;
|
|
|
|
child_pid = SAFE_FORK();
|
|
|
|
if (!child_pid)
|
|
child_main();
|
|
|
|
if (SAFE_WAITPID(child_pid, &status, WUNTRACED) != child_pid)
|
|
tst_brk(TBROK, "Received event from unexpected PID");
|
|
|
|
SAFE_PTRACE(PTRACE_ATTACH, child_pid, NULL, NULL);
|
|
SAFE_PTRACE(PTRACE_POKEUSER, child_pid,
|
|
(void *)offsetof(struct user, u_debugreg[0]), (void *)1);
|
|
SAFE_PTRACE(PTRACE_POKEUSER, child_pid,
|
|
(void *)offsetof(struct user, u_debugreg[0]), (void *)2);
|
|
|
|
addr = ptrace(PTRACE_PEEKUSER, child_pid,
|
|
(void*)offsetof(struct user, u_debugreg[0]), NULL);
|
|
|
|
if (addr == 2)
|
|
tst_res(TPASS, "The rd0 was set on second PTRACE_POKEUSR");
|
|
else
|
|
tst_res(TFAIL, "The rd0 wasn't set on second PTRACE_POKEUSER");
|
|
|
|
SAFE_PTRACE(PTRACE_DETACH, child_pid, NULL, NULL);
|
|
SAFE_KILL(child_pid, SIGCONT);
|
|
child_pid = 0;
|
|
tst_reap_children();
|
|
}
|
|
|
|
static void cleanup(void)
|
|
{
|
|
/* Main process terminated by tst_brk() with child still paused */
|
|
if (child_pid)
|
|
SAFE_KILL(child_pid, SIGKILL);
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.test_all = run,
|
|
.cleanup = cleanup,
|
|
.forks_child = 1,
|
|
.tags = (const struct tst_tag[]) {
|
|
{"linux-git", "bd14406b78e6"},
|
|
{}
|
|
}
|
|
};
|
|
#else
|
|
TST_TEST_TCONF("This test is only supported on x86 systems");
|
|
#endif
|