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

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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: Gregory Price <gregory.price@memverge.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230407171834.3558-5-gregory.price@memverge.com
This commit is contained in:
Gregory Price 2023-04-07 13:18:34 -04:00 committed by Thomas Gleixner
parent 3f67987cdc
commit 8c8fa605f7
3 changed files with 74 additions and 1 deletions
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1
tools/testing/selftests/ptrace/.gitignore vendored
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@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
get_syscall_info
get_set_sud
peeksiginfo
vmaccess

2
tools/testing/selftests/ptrace/Makefile
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@ -1,6 +1,6 @@
# 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

72
tools/testing/selftests/ptrace/get_set_sud.c Normal file
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@ -0,0 +1,72 @@
// 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