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)  * iopl.c - Test case for a Linux on Xen 64-bit bug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (c) 2015 Andrew Lutomirski
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #define _GNU_SOURCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <stdint.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <setjmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <stdlib.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 <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <sys/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <stdbool.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <sys/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static int nerrs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 		       int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct sigaction sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	memset(&sa, 0, sizeof(sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	sa.sa_sigaction = handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	sa.sa_flags = SA_SIGINFO | flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	sigemptyset(&sa.sa_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (sigaction(sig, &sa, 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		err(1, "sigaction");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static void clearhandler(int sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct sigaction sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	memset(&sa, 0, sizeof(sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	sa.sa_handler = SIG_DFL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	sigemptyset(&sa.sa_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (sigaction(sig, &sa, 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		err(1, "sigaction");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static jmp_buf jmpbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static void sigsegv(int sig, siginfo_t *si, void *ctx_void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	siglongjmp(jmpbuf, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static bool try_outb(unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	sethandler(SIGSEGV, sigsegv, SA_RESETHAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (sigsetjmp(jmpbuf, 1) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		asm volatile ("outb %%al, %w[port]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			      : : [port] "Nd" (port), "a" (0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	clearhandler(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void expect_ok_outb(unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (!try_outb(port)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		printf("[FAIL]\toutb to 0x%02hx failed\n", port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	printf("[OK]\toutb to 0x%02hx worked\n", port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static void expect_gp_outb(unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (try_outb(port)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		printf("[FAIL]\toutb to 0x%02hx worked\n", port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	printf("[OK]\toutb to 0x%02hx failed\n", port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) #define RET_FAULTED	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) #define RET_FAIL	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) #define RET_EMUL	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static int try_cli(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	sethandler(SIGSEGV, sigsegv, SA_RESETHAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (sigsetjmp(jmpbuf, 1) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		return RET_FAULTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		asm volatile("cli; pushf; pop %[flags]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 				: [flags] "=rm" (flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		/* X86_FLAGS_IF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if (!(flags & (1 << 9)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			return RET_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			return RET_EMUL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	clearhandler(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int try_sti(bool irqs_off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	sethandler(SIGSEGV, sigsegv, SA_RESETHAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (sigsetjmp(jmpbuf, 1) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return RET_FAULTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		asm volatile("sti; pushf; pop %[flags]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 				: [flags] "=rm" (flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		/* X86_FLAGS_IF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		if (irqs_off && (flags & (1 << 9)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			return RET_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			return RET_EMUL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	clearhandler(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static void expect_gp_sti(bool irqs_off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	int ret = try_sti(irqs_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	case RET_FAULTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		printf("[OK]\tSTI faulted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	case RET_EMUL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		printf("[OK]\tSTI NOPped\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		printf("[FAIL]\tSTI worked\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)  * Returns whether it managed to disable interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static bool test_cli(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	int ret = try_cli();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	case RET_FAULTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		printf("[OK]\tCLI faulted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	case RET_EMUL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		printf("[OK]\tCLI NOPped\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		printf("[FAIL]\tCLI worked\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	cpu_set_t cpuset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	CPU_ZERO(&cpuset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	CPU_SET(0, &cpuset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		err(1, "sched_setaffinity to CPU 0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	/* Probe for iopl support.  Note that iopl(0) works even as nonroot. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	switch(iopl(3)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	case -ENOSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		printf("[OK]\tiopl() nor supported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		printf("[OK]\tiopl(3) failed (%d) -- try running as root\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		       errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	/* Make sure that CLI/STI are blocked even with IOPL level 3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	expect_gp_sti(test_cli());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	expect_ok_outb(0x80);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	/* Establish an I/O bitmap to test the restore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (ioperm(0x80, 1, 1) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		err(1, "ioperm(0x80, 1, 1) failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/* Restore our original state prior to starting the fork test. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (iopl(0) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		err(1, "iopl(0)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 * Verify that IOPL emulation is disabled and the I/O bitmap still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	 * works.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	expect_ok_outb(0x80);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	expect_gp_outb(0xed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	/* Drop the I/O bitmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (ioperm(0x80, 1, 0) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		err(1, "ioperm(0x80, 1, 0) failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	pid_t child = fork();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (child == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		err(1, "fork");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (child == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		printf("\tchild: set IOPL to 3\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		if (iopl(3) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			err(1, "iopl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		printf("[RUN]\tchild: write to 0x80\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		asm volatile ("outb %%al, $0x80" : : "a" (0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		if (waitpid(child, &status, 0) != child ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		    !WIFEXITED(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			printf("[FAIL]\tChild died\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		} else if (WEXITSTATUS(status) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			printf("[FAIL]\tChild failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			printf("[OK]\tChild succeeded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		}
^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) 	printf("[RUN]\tparent: write to 0x80 (should fail)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	expect_gp_outb(0x80);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	expect_gp_sti(test_cli());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/* Test the capability checks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	printf("\tiopl(3)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (iopl(3) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		err(1, "iopl(3)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	printf("\tDrop privileges\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (setresuid(1, 1, 1) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		printf("[WARN]\tDropping privileges failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		goto done;
^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) 	printf("[RUN]\tiopl(3) unprivileged but with IOPL==3\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (iopl(3) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		printf("[FAIL]\tiopl(3) should work if iopl is already 3 even if unprivileged\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	printf("[RUN]\tiopl(0) unprivileged\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (iopl(0) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		printf("[FAIL]\tiopl(0) should work if iopl is already 3 even if unprivileged\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	printf("[RUN]\tiopl(3) unprivileged\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (iopl(3) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		printf("[FAIL]\tiopl(3) should fail if when unprivileged if iopl==0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		nerrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		printf("[OK]\tFailed as expected\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	return nerrs ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }