Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <stdarg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <sys/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <sys/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <sys/resource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <mem_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <ptrace_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <registers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <skas.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static void ptrace_child(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	/* Calling os_getpid because some libcs cached getpid incorrectly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	int pid = os_getpid(), ppid = getppid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	int sc_result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (change_sig(SIGWINCH, 0) < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	    ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		perror("ptrace");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		kill(pid, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	kill(pid, SIGSTOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	 * This syscall will be intercepted by the parent. Don't call more than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	 * once, please.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	sc_result = os_getpid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (sc_result == pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		/* Nothing modified by the parent, we are running normally. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	else if (sc_result == ppid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		 * Expected in check_ptrace and check_sysemu when they succeed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		 * in modifying the stack frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		/* Serious trouble! This could be caused by a bug in host 2.6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		 * SKAS3/2.6 patch before release -V6, together with a bug in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		 * the UML code itself.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		ret = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	exit(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static void fatal_perror(const char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	perror(str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) static void fatal(char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	va_list list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	va_start(list, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	vfprintf(stderr, fmt, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	va_end(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void non_fatal(char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	va_list list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	va_start(list, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	vfprintf(stderr, fmt, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	va_end(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) static int start_ptraced_child(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	int pid, n, status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	fflush(stdout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	pid = fork();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (pid == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		ptrace_child();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	else if (pid < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		fatal_perror("start_ptraced_child : fork failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		fatal_perror("check_ptrace : waitpid failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		fatal("check_ptrace : expected SIGSTOP, got status = %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		      status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	return pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* When testing for SYSEMU support, if it is one of the broken versions, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)  * must just avoid using sysemu, not panic, but only if SYSEMU features are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)  * broken.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  * So only for SYSEMU features we test mustpanic, while normal host features
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * must work anyway!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int stop_ptraced_child(int pid, int exitcode, int mustexit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	int status, n, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (ptrace(PTRACE_CONT, pid, 0, 0) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		perror("stop_ptraced_child : ptrace failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	CATCH_EINTR(n = waitpid(pid, &status, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		int exit_with = WEXITSTATUS(status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		if (exit_with == 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			non_fatal("check_ptrace : child exited with status 2. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				  "\nDisabling SYSEMU support.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		non_fatal("check_ptrace : child exited with exitcode %d, while "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			  "expecting %d; status 0x%x\n", exit_with,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			  exitcode, status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		if (mustexit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* Changed only during early boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static int force_sysemu_disabled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static int __init nosysemu_cmd_param(char *str, int* add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	force_sysemu_disabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) __uml_setup("nosysemu", nosysemu_cmd_param,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) "nosysemu\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) "    Turns off syscall emulation patch for ptrace (SYSEMU).\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) "    SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) "    behaviour of ptrace() and helps reduce host context switch rates.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) "    To make it work, you need a kernel patch for your host, too.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) "    See http://perso.wanadoo.fr/laurent.vivier/UML/ for further \n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) "    information.\n\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static void __init check_sysemu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	unsigned long regs[MAX_REG_NR];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	int pid, n, status, count=0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	os_info("Checking syscall emulation patch for ptrace...");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	sysemu_supported = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	pid = start_ptraced_child();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		fatal_perror("check_sysemu : wait failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		fatal("check_sysemu : expected SIGTRAP, got status = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		      status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		fatal_perror("check_sysemu : PTRACE_GETREGS failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (PT_SYSCALL_NR(regs) != __NR_getpid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		non_fatal("check_sysemu got system call number %d, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			  "expected %d...", PT_SYSCALL_NR(regs), __NR_getpid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_RET_OFFSET, os_getpid());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		non_fatal("check_sysemu : failed to modify system call "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			  "return");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (stop_ptraced_child(pid, 0, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		goto fail_stopped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	sysemu_supported = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	os_info("OK\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	set_using_sysemu(!force_sysemu_disabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	os_info("Checking advanced syscall emulation patch for ptrace...");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	pid = start_ptraced_child();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		   (void *) PTRACE_O_TRACESYSGOOD) < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		fatal_perror("check_sysemu: PTRACE_OLDSETOPTIONS failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		if (ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		if (n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			fatal_perror("check_sysemu: wait failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		if (WIFSTOPPED(status) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		    (WSTOPSIG(status) == (SIGTRAP|0x80))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			if (!count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 				non_fatal("check_sysemu: SYSEMU_SINGLESTEP "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 					  "doesn't singlestep");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 				goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_RET_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				   os_getpid());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 			if (n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 				fatal_perror("check_sysemu : failed to modify "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 					     "system call return");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			non_fatal("check_sysemu: expected SIGTRAP or "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 				  "(SIGTRAP | 0x80), got status = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 				  status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (stop_ptraced_child(pid, 0, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		goto fail_stopped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	sysemu_supported = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	os_info("OK\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!force_sysemu_disabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		set_using_sysemu(sysemu_supported);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	stop_ptraced_child(pid, 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) fail_stopped:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	non_fatal("missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static void __init check_ptrace(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	int pid, syscall, n, status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	os_info("Checking that ptrace can change system call numbers...");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	pid = start_ptraced_child();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		   (void *) PTRACE_O_TRACESYSGOOD) < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		fatal_perror("check_ptrace: PTRACE_OLDSETOPTIONS failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		if (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			fatal_perror("check_ptrace : ptrace failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		if (n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			fatal_perror("check_ptrace : wait failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		if (!WIFSTOPPED(status) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		   (WSTOPSIG(status) != (SIGTRAP | 0x80)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			fatal("check_ptrace : expected (SIGTRAP|0x80), "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			       "got status = %d", status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		syscall = ptrace(PTRACE_PEEKUSER, pid, PT_SYSCALL_NR_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 				 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		if (syscall == __NR_getpid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 				   __NR_getppid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			if (n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 				fatal_perror("check_ptrace : failed to modify "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 					     "system call");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	stop_ptraced_child(pid, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	os_info("OK\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	check_sysemu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) extern void check_tmpexec(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static void __init check_coredump_limit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	struct rlimit lim;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	int err = getrlimit(RLIMIT_CORE, &lim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		perror("Getting core dump limit");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	os_info("Core dump limits :\n\tsoft - ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (lim.rlim_cur == RLIM_INFINITY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		os_info("NONE\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		os_info("%llu\n", (unsigned long long)lim.rlim_cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	os_info("\thard - ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (lim.rlim_max == RLIM_INFINITY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		os_info("NONE\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		os_info("%llu\n", (unsigned long long)lim.rlim_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) void __init os_early_checks(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	int pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	/* Print out the core dump limits early */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	check_coredump_limit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	check_ptrace();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	/* Need to check this early because mmapping happens before the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	 * kernel is running.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	check_tmpexec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	pid = start_ptraced_child();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	if (init_pid_registers(pid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		fatal("Failed to initialize default registers");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	stop_ptraced_child(pid, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) int __init parse_iomem(char *str, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	struct iomem_region *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	struct stat64 buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	char *file, *driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	int fd, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	driver = str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	file = strchr(str,',');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if (file == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		os_warn("parse_iomem : failed to parse iomem\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	*file = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	file++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	fd = open(file, O_RDWR, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		perror("parse_iomem - Couldn't open io file");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	if (fstat64(fd, &buf) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		perror("parse_iomem - cannot stat_fd file");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	new = malloc(sizeof(*new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	if (new == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		perror("Couldn't allocate iomem_region struct");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	size = (buf.st_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	*new = ((struct iomem_region) { .next		= iomem_regions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 					.driver		= driver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 					.fd		= fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 					.size		= size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 					.phys		= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 					.virt		= 0 });
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	iomem_regions = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	iomem_size += new->size + UM_KERN_PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)  out_close:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }