<commit_before>/*
 * Copyright (C) 2000 - 2007 <NAME> (<EMAIL>)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <asm/unistd.h>
#include "init.h"
#include "kern_constants.h"
#include "os.h"
#include "mem_user.h"
#include "ptrace_user.h"
#include "registers.h"
#include "skas.h"
#include "skas_ptrace.h"

static void ptrace_child(void)
{
	int ret;
	/* Calling os_getpid because some libcs cached getpid incorrectly */
	int pid = os_getpid(), ppid = getppid();
	int sc_result;

	if (change_sig(SIGWINCH, 0) < 0 ||
	    ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
		perror("ptrace");
		kill(pid, SIGKILL);
	}
	kill(pid, SIGSTOP);

	/*
	 * This syscall will be intercepted by the parent. Don't call more than
	 * once, please.
	 */
	sc_result = os_getpid();

	if (sc_result == pid)
		/* Nothing modified by the parent, we are running normally. */
		ret = 1;
	else if (sc_result == ppid)
		/*
		 * Expected in check_ptrace and check_sysemu when they succeed
		 * in modifying the stack frame
		 */
		ret = 0;
	else
		/* Serious trouble! This could be caused by a bug in host 2.6
		 * SKAS3/2.6 patch before release -V6, together with a bug in
		 * the UML code itself.
		 */
		ret = 2;

	exit(ret);
}

static void fatal_perror(const char *str)
{
	perror(str);
	exit(1);
}

static void fatal(char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	vfprintf(stderr, fmt, list);
	va_end(list);

	exit(1);
}

static void non_fatal(char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	vfprintf(stderr, fmt, list);
	va_end(list);
}

static int start_ptraced_child(void)
{
	int pid, n, status;

	pid = fork();
	if (pid == 0)
		ptrace_child();
	else if (pid < 0)
		fatal_perror("start_ptraced_child : fork failed");

	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
	if (n < 0)
		fatal_perror("check_ptrace : waitpid failed");
	if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
		fatal("check_ptrace : expected SIGSTOP, got status = %d",
		      status);

	return pid;
}

/* When testing for SYSEMU support, if it is one of the broken versions, we
 * must just avoid using sysemu, not panic, but only if SYSEMU features are
 * broken.
 * So only for SYSEMU features we test mustpanic, while normal host features
 * must work anyway!
 */
static int stop_ptraced_child(int pid, int exitcode, int mustexit)
{
	int status, n, ret = 0;

	if (ptrace(PTRACE_CONT, pid, 0, 0) < 0)
		fatal_perror("stop_ptraced_child : ptrace failed");
	CATCH_EINTR(n = waitpid(pid, &status, 0));
	if (!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
		int exit_with = WEXITSTATUS(status);
		if (exit_with == 2)
			non_fatal("check_ptrace : child exited with status 2. "
				  "\nDisabling SYSEMU support.\n");
		non_fatal("check_ptrace : child exited with exitcode %d, while "
			  "expecting %d; status 0x%x\n", exit_with,
			  exitcode, status);
		if (mustexit)
			exit(1);
		ret = -1;
	}

	return ret;
}

/* Changed only during early boot */
int ptrace_faultinfo;
static int disable_ptrace_faultinfo;

int ptrace_ldt;
static int disable_ptrace_ldt;

int proc_mm;
static int disable_proc_mm;

int have_switch_mm;
static int disable_switch_mm;

int skas_needs_stub;

static int __init skas0_cmd_param(char *str, int* add)
{
	disable_ptrace_faultinfo = 1;
	disable_ptrace_ldt = 1;
	disable_proc_mm = 1;
	disable_switch_mm = 1;

	return 0;
}

/* The two __uml_setup would conflict, without this stupid alias. */

static int __init mode_skas0_cmd_param(char *str, int* add)
	__attribute__((alias("skas0_cmd_param")));

__uml_setup("skas0", skas0_cmd_param,
"skas0\n"
"    Disables SKAS3 and SKAS4 usage, so that SKAS0 is used\n\n");

__uml_setup("mode=skas0", mode_skas0_cmd_param,
"mode=skas0\n"
"    Disables SKAS3 and SKAS4 usage, so that SKAS0 is used.\n\n");

/* Changed only during early boot */
static int force_sysemu_disabled = 0;

static int __init nosysemu_cmd_param(char *str, int* add)
{
	force_sysemu_disabled = 1;
	return 0;
}

__uml_setup("nosysemu", nosysemu_cmd_param,
"nosysemu\n"
"    Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
"    SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
"    behaviour of ptrace() and helps reducing host context switch rate.\n"
"    To make it working, you need a kernel patch for your host, too.\n"
"    See http://perso.wanadoo.fr/laurent.vivier/UML/ for further \n"
"    information.\n\n");

static void __init check_sysemu(void)
{
	unsigned long regs[MAX_REG_NR];
	int pid, n, status, count=0;

	non_fatal("Checking syscall emulation patch for ptrace...");
	sysemu_supported = 0;
	pid = start_ptraced_child();

	if (ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
		goto fail;

	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
	if (n < 0)
		fatal_perror("check_sysemu : wait failed");
	if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
		fatal("check_sysemu : expected SIGTRAP, got status = %d",
		      status);

	if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
		fatal_perror("check_sysemu : PTRACE_GETREGS failed");
	if (PT_SYSCALL_NR(regs) != __NR_getpid) {
		non_fatal("check_sysemu got system call number %d, "
			  "expected %d...", PT_SYSCALL_NR(regs), __NR_getpid);
		goto fail;
	}

	n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, os_getpid());
	if (n < 0) {
		non_fatal("check_sysemu : failed to modify system call "
			  "return");
		goto fail;
	}

	if (stop_ptraced_child(pid, 0, 0) < 0)
		goto fail_stopped;

	sysemu_supported = 1;
	non_fatal("OK\n");
	set_using_sysemu(!force_sysemu_disabled);

	non_fatal("Checking advanced syscall emulation patch for ptrace...");
	pid = start_ptraced_child();

	if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
		   (void *) PTRACE_O_TRACESYSGOOD) < 0))
		fatal_perror("check_ptrace: PTRACE_OLDSETOPTIONS failed");

	while (1) {
		count++;
		if (ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
			goto fail;
		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
		if (n < 0)
			fatal_perror("check_ptrace : wait failed");

		if (WIFSTOPPED(status) &&
		    (WSTOPSIG(status) == (SIGTRAP|0x80))) {
			if (!count)
				fatal("check_ptrace : SYSEMU_SINGLESTEP "
				      "doesn't singlestep");
			n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
				   os_getpid());
			if (n < 0)
				fatal_perror("check_sysemu : failed to modify "
					     "system call return");
			break;
		}
		else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP))
			count++;
		else
			fatal("check_ptrace : expected SIGTRAP or "
			      "(SIGTRAP | 0x80), got status = %d", status);
	}
	if (stop_ptraced_child(pid, 0, 0) < 0)
		goto fail_stopped;

	sysemu_supported = 2;
	non_fatal("OK\n");

	if (!force_sysemu_disabled)
		set_using_sysemu(sysemu_supported);
	return;

fail:
	stop_ptraced_child(pid, 1, 0);
fail_stopped:
	non_fatal("missing\n");
}

static void __init check_ptrace(void)
{
	int pid, syscall, n, status;<commit_msg>uml: work around broken host PTRACE_SYSEMU<commit_after>/*
 * Copyright (C) 2000 - 2007 <NAME> (<EMAIL>)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <asm/unistd.h>
#include "init.h"
#include "kern_constants.h"
#include "os.h"
#include "mem_user.h"
#include "ptrace_user.h"
#include "registers.h"
#include "skas.h"
#include "skas_ptrace.h"

static void ptrace_child(void)
{
	int ret;
	/* Calling os_getpid because some libcs cached getpid incorrectly */
	int pid = os_getpid(), ppid = getppid();
	int sc_result;

	if (change_sig(SIGWINCH, 0) < 0 ||
	    ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
		perror("ptrace");
		kill(pid, SIGKILL);
	}
	kill(pid, SIGSTOP);

	/*
	 * This syscall will be intercepted by the parent. Don't call more than
	 * once, please.
	 */
	sc_result = os_getpid();

	if (sc_result == pid)
		/* Nothing modified by the parent, we are running normally. */
		ret = 1;
	else if (sc_result == ppid)
		/*
		 * Expected in check_ptrace and check_sysemu when they succeed
		 * in modifying the stack frame
		 */
		ret = 0;
	else
		/* Serious trouble! This could be caused by a bug in host 2.6
		 * SKAS3/2.6 patch before release -V6, together with a bug in
		 * the UML code itself.
		 */
		ret = 2;

	exit(ret);
}

static void fatal_perror(const char *str)
{
	perror(str);
	exit(1);
}

static void fatal(char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	vfprintf(stderr, fmt, list);
	va_end(list);

	exit(1);
}

static void non_fatal(char *fmt, ...)
{
	va_list list;

	va_start(list, fmt);
	vfprintf(stderr, fmt, list);
	va_end(list);
}

static int start_ptraced_child(void)
{
	int pid, n, status;

	pid = fork();
	if (pid == 0)
		ptrace_child();
	else if (pid < 0)
		fatal_perror("start_ptraced_child : fork failed");

	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
	if (n < 0)
		fatal_perror("check_ptrace : waitpid failed");
	if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
		fatal("check_ptrace : expected SIGSTOP, got status = %d",
		      status);

	return pid;
}

/* When testing for SYSEMU support, if it is one of the broken versions, we
 * must just avoid using sysemu, not panic, but only if SYSEMU features are
 * broken.
 * So only for SYSEMU features we test mustpanic, while normal host features
 * must work anyway!
 */
static int stop_ptraced_child(int pid, int exitcode, int mustexit)
{
	int status, n, ret = 0;

	if (ptrace(PTRACE_CONT, pid, 0, 0) < 0) {
		perror("stop_ptraced_child : ptrace failed");
		return -1;
	}
	CATCH_EINTR(n = waitpid(pid, &status, 0));
	if (!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
		int exit_with = WEXITSTATUS(status);
		if (exit_with == 2)
			non_fatal("check_ptrace : child exited with status 2. "
				  "\nDisabling SYSEMU support.\n");
		non_fatal("check_ptrace : child exited with exitcode %d, while "
			  "expecting %d; status 0x%x\n", exit_with,
			  exitcode, status);
		if (mustexit)
			exit(1);
		ret = -1;
	}

	return ret;
}

/* Changed only during early boot */
int ptrace_faultinfo;
static int disable_ptrace_faultinfo;

int ptrace_ldt;
static int disable_ptrace_ldt;

int proc_mm;
static int disable_proc_mm;

int have_switch_mm;
static int disable_switch_mm;

int skas_needs_stub;

static int __init skas0_cmd_param(char *str, int* add)
{
	disable_ptrace_faultinfo = 1;
	disable_ptrace_ldt = 1;
	disable_proc_mm = 1;
	disable_switch_mm = 1;

	return 0;
}

/* The two __uml_setup would conflict, without this stupid alias. */

static int __init mode_skas0_cmd_param(char *str, int* add)
	__attribute__((alias("skas0_cmd_param")));

__uml_setup("skas0", skas0_cmd_param,
"skas0\n"
"    Disables SKAS3 and SKAS4 usage, so that SKAS0 is used\n\n");

__uml_setup("mode=skas0", mode_skas0_cmd_param,
"mode=skas0\n"
"    Disables SKAS3 and SKAS4 usage, so that SKAS0 is used.\n\n");

/* Changed only during early boot */
static int force_sysemu_disabled = 0;

static int __init nosysemu_cmd_param(char *str, int* add)
{
	force_sysemu_disabled = 1;
	return 0;
}

__uml_setup("nosysemu", nosysemu_cmd_param,
"nosysemu\n"
"    Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
"    SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
"    behaviour of ptrace() and helps reducing host context switch rate.\n"
"    To make it working, you need a kernel patch for your host, too.\n"
"    See http://perso.wanadoo.fr/laurent.vivier/UML/ for further \n"
"    information.\n\n");

static void __init check_sysemu(void)
{
	unsigned long regs[MAX_REG_NR];
	int pid, n, status, count=0;

	non_fatal("Checking syscall emulation patch for ptrace...");
	sysemu_supported = 0;
	pid = start_ptraced_child();

	if (ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
		goto fail;

	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
	if (n < 0)
		fatal_perror("check_sysemu : wait failed");
	if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
		fatal("check_sysemu : expected SIGTRAP, got status = %d\n",
		      status);

	if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
		fatal_perror("check_sysemu : PTRACE_GETREGS failed");
	if (PT_SYSCALL_NR(regs) != __NR_getpid) {
		non_fatal("check_sysemu got system call number %d, "
			  "expected %d...", PT_SYSCALL_NR(regs), __NR_getpid);
		goto fail;
	}

	n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, os_getpid());
	if (n < 0) {
		non_fatal("check_sysemu : failed to modify system call "
			  "return");
		goto fail;
	}

	if (stop_ptraced_child(pid, 0, 0) < 0)
		goto fail_stopped;

	sysemu_supported = 1;
	non_fatal("OK\n");
	set_using_sysemu(!force_sysemu_disabled);

	non_fatal("Checking advanced syscall emulation patch for ptrace...");
	pid = start_ptraced_child();

	if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
		   (void *) PTRACE_O_TRACESYSGOOD) < 0))
		fatal_perror("check_ptrace: PTRACE_OLDSETOPTIONS failed");

	while (1) {
		count++;
		if (ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
			goto fail;
		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
		if (n < 0)
			fatal_perror("check_ptrace : wait failed");

		if (WIFSTOPPED(status) &&
		    (WSTOPSIG(status) == (SIGTRAP|0x80))) {
			if (!count) {
				non_fatal("check_ptrace : SYSEMU_SINGLESTEP "
					  "doesn't singlestep");
				goto fail;
			}
			n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
				   os_getpid());
			if (n < 0)
				fatal_perror("check_sysemu : failed to modify "
					     "system call return");
			break;
		}
		else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP))
			count++;
		else {
			non_fatal("check_ptrace : expected SIGTRAP or "
				  "(SIGTRAP | 0x80), got status = %d\n",
				  status);
			goto fail;
		}
	}
	if (stop_ptraced_child(pid, 0, 0) < 0)
		goto fail_stopped;

	sysemu_supported = 2;
	non_fatal("OK\n");

	if (!force_sysemu_disabled)
		set_using_sysemu(sysemu_supported);
	return;

fail:
	stop_ptraced_child(pid, 1, 0);
fail_stopped:
	non_fatal("missing\n");
}

static void __init check_ptrace(void)
{
	int pid, syscall, n, status;
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