Commit 8c8fa605 authored by Gregory Price's avatar Gregory Price Committed by Thomas Gleixner
Browse files

selftest, ptrace: Add selftest for syscall user dispatch config api 



Validate that the following new ptrace requests work as expected

 * PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG
   returns the contents of task->syscall_dispatch

 * PTRACE_SET_SYSCALL_USER_DISPATCH_CONFIG
   sets the contents of task->syscall_dispatch

Signed-off-by: default avatarGregory Price <gregory.price@memverge.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230407171834.3558-5-gregory.price@memverge.com
parent 3f67987c

tools/testing/selftests/ptrace/.gitignore

+1 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0-only

get_syscall_info

get_set_sud

peeksiginfo

vmaccess

tools/testing/selftests/ptrace/Makefile

+1 −1
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0-only

CFLAGS += -std=c99 -pthread -Wall $(KHDR_INCLUDES)



TEST_GEN_PROGS := get_syscall_info peeksiginfo vmaccess

TEST_GEN_PROGS := get_syscall_info peeksiginfo vmaccess get_set_sud



include ../lib.mk

tools/testing/selftests/ptrace/get_set_sud.c

0 → 100644
+72 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#define _GNU_SOURCE

#include "../kselftest_harness.h"

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <sys/wait.h>

#include <sys/syscall.h>

#include <sys/prctl.h>



#include "linux/ptrace.h"



static int sys_ptrace(int request, pid_t pid, void *addr, void *data)

{

	return syscall(SYS_ptrace, request, pid, addr, data);

}



TEST(get_set_sud)

{

	struct ptrace_sud_config config;

	pid_t child;

	int ret = 0;

	int status;



	child = fork();

	ASSERT_GE(child, 0);

	if (child == 0) {

		ASSERT_EQ(0, sys_ptrace(PTRACE_TRACEME, 0, 0, 0)) {

			TH_LOG("PTRACE_TRACEME: %m");

		}

		kill(getpid(), SIGSTOP);

		_exit(1);

	}



	waitpid(child, &status, 0);



	memset(&config, 0xff, sizeof(config));

	config.mode = PR_SYS_DISPATCH_ON;



	ret = sys_ptrace(PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG, child,

			 (void *)sizeof(config), &config);



	ASSERT_EQ(ret, 0);

	ASSERT_EQ(config.mode, PR_SYS_DISPATCH_OFF);

	ASSERT_EQ(config.selector, 0);

	ASSERT_EQ(config.offset, 0);

	ASSERT_EQ(config.len, 0);



	config.mode = PR_SYS_DISPATCH_ON;

	config.selector = 0;

	config.offset = 0x400000;

	config.len = 0x1000;



	ret = sys_ptrace(PTRACE_SET_SYSCALL_USER_DISPATCH_CONFIG, child,

			 (void *)sizeof(config), &config);



	ASSERT_EQ(ret, 0);



	memset(&config, 1, sizeof(config));

	ret = sys_ptrace(PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG, child,

			 (void *)sizeof(config), &config);



	ASSERT_EQ(ret, 0);

	ASSERT_EQ(config.mode, PR_SYS_DISPATCH_ON);

	ASSERT_EQ(config.selector, 0);

	ASSERT_EQ(config.offset, 0x400000);

	ASSERT_EQ(config.len, 0x1000);



	kill(child, SIGKILL);

}



TEST_HARNESS_MAIN