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Revert "selftests/ptrace: add test cases for dead-locks"

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This reverts commit 2f7a0de4e5 which is
commit 2de4e82318c7f9d34f4b08599a612cd4cd10bf0b upstream.

It breaks the API and we don't need it right now in the 5.4 tree.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic49ab9374cf94f4e091acc130f39c20c9542cf3b
This commit is contained in:
Greg Kroah-Hartman 2020-10-01 20:22:52 +02:00
commit 39f690e459
2 changed files with 2 additions and 88 deletions
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4
tools/testing/selftests/ptrace/Makefile
View file

@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
CFLAGS += -std=c99 -pthread -iquote../../../../include/uapi -Wall
CFLAGS += -iquote../../../../include/uapi -Wall
TEST_GEN_PROGS := get_syscall_info peeksiginfo vmaccess
TEST_GEN_PROGS := get_syscall_info peeksiginfo
include ../lib.mk

86
tools/testing/selftests/ptrace/vmaccess.c
View file

@ -1,86 +0,0 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2020 Bernd Edlinger <bernd.edlinger@hotmail.de>
* All rights reserved.
*
* Check whether /proc/$pid/mem can be accessed without causing deadlocks
* when de_thread is blocked with ->cred_guard_mutex held.
*/
#include "../kselftest_harness.h"
#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
#include <sys/ptrace.h>
static void *thread(void *arg)
{
ptrace(PTRACE_TRACEME, 0, 0L, 0L);
return NULL;
}
TEST(vmaccess)
{
int f, pid = fork();
char mm[64];
if (!pid) {
pthread_t pt;
pthread_create(&pt, NULL, thread, NULL);
pthread_join(pt, NULL);
execlp("true", "true", NULL);
}
sleep(1);
sprintf(mm, "/proc/%d/mem", pid);
f = open(mm, O_RDONLY);
ASSERT_GE(f, 0);
close(f);
f = kill(pid, SIGCONT);
ASSERT_EQ(f, 0);
}
TEST(attach)
{
int s, k, pid = fork();
if (!pid) {
pthread_t pt;
pthread_create(&pt, NULL, thread, NULL);
pthread_join(pt, NULL);
execlp("sleep", "sleep", "2", NULL);
}
sleep(1);
k = ptrace(PTRACE_ATTACH, pid, 0L, 0L);
ASSERT_EQ(errno, EAGAIN);
ASSERT_EQ(k, -1);
k = waitpid(-1, &s, WNOHANG);
ASSERT_NE(k, -1);
ASSERT_NE(k, 0);
ASSERT_NE(k, pid);
ASSERT_EQ(WIFEXITED(s), 1);
ASSERT_EQ(WEXITSTATUS(s), 0);
sleep(1);
k = ptrace(PTRACE_ATTACH, pid, 0L, 0L);
ASSERT_EQ(k, 0);
k = waitpid(-1, &s, 0);
ASSERT_EQ(k, pid);
ASSERT_EQ(WIFSTOPPED(s), 1);
ASSERT_EQ(WSTOPSIG(s), SIGSTOP);
k = ptrace(PTRACE_DETACH, pid, 0L, 0L);
ASSERT_EQ(k, 0);
k = waitpid(-1, &s, 0);
ASSERT_EQ(k, pid);
ASSERT_EQ(WIFEXITED(s), 1);
ASSERT_EQ(WEXITSTATUS(s), 0);
k = waitpid(-1, NULL, 0);
ASSERT_EQ(k, -1);
ASSERT_EQ(errno, ECHILD);
}
TEST_HARNESS_MAIN