Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <unistd.h> |
| 9 | #include <limits.h> |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 10 | #include <sys/mman.h> |
| 11 | #include <sys/stat.h> |
| 12 | #include <sys/utsname.h> |
| 13 | #include <sys/param.h> |
| 14 | #include <sys/time.h> |
| 15 | #include "asm/types.h" |
| 16 | #include <ctype.h> |
| 17 | #include <signal.h> |
| 18 | #include <wait.h> |
| 19 | #include <errno.h> |
| 20 | #include <stdarg.h> |
| 21 | #include <sched.h> |
| 22 | #include <termios.h> |
| 23 | #include <string.h> |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 24 | #include "kern_util.h" |
| 25 | #include "user.h" |
| 26 | #include "mem_user.h" |
| 27 | #include "init.h" |
| 28 | #include "ptrace_user.h" |
| 29 | #include "uml-config.h" |
| 30 | #include "os.h" |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 31 | #include "longjmp.h" |
Jeff Dike | 1ffb916 | 2007-05-06 14:51:22 -0700 | [diff] [blame] | 32 | #include "kern_constants.h" |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 33 | |
| 34 | void stack_protections(unsigned long address) |
| 35 | { |
Jeff Dike | 57598fd | 2007-05-10 22:22:30 -0700 | [diff] [blame] | 36 | if(mprotect((void *) address, UM_THREAD_SIZE, |
| 37 | PROT_READ | PROT_WRITE | PROT_EXEC) < 0) |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 38 | panic("protecting stack failed, errno = %d", errno); |
| 39 | } |
| 40 | |
| 41 | int raw(int fd) |
| 42 | { |
| 43 | struct termios tt; |
| 44 | int err; |
| 45 | |
| 46 | CATCH_EINTR(err = tcgetattr(fd, &tt)); |
| 47 | if(err < 0) |
| 48 | return -errno; |
| 49 | |
| 50 | cfmakeraw(&tt); |
| 51 | |
| 52 | CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt)); |
| 53 | if(err < 0) |
| 54 | return -errno; |
| 55 | |
| 56 | /* XXX tcsetattr could have applied only some changes |
| 57 | * (and cfmakeraw() is a set of changes) */ |
Jeff Dike | 57598fd | 2007-05-10 22:22:30 -0700 | [diff] [blame] | 58 | return 0; |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | void setup_machinename(char *machine_out) |
| 62 | { |
| 63 | struct utsname host; |
| 64 | |
| 65 | uname(&host); |
Paolo 'Blaisorblade' Giarrusso | 69fada3 | 2006-10-11 01:21:36 -0700 | [diff] [blame] | 66 | #ifdef UML_CONFIG_UML_X86 |
| 67 | # ifndef UML_CONFIG_64BIT |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 68 | if (!strcmp(host.machine, "x86_64")) { |
| 69 | strcpy(machine_out, "i686"); |
| 70 | return; |
| 71 | } |
Paolo 'Blaisorblade' Giarrusso | 69fada3 | 2006-10-11 01:21:36 -0700 | [diff] [blame] | 72 | # else |
| 73 | if (!strcmp(host.machine, "i686")) { |
| 74 | strcpy(machine_out, "x86_64"); |
| 75 | return; |
| 76 | } |
| 77 | # endif |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 78 | #endif |
| 79 | strcpy(machine_out, host.machine); |
| 80 | } |
| 81 | |
Jeff Dike | b4ffb6a | 2007-05-06 14:50:59 -0700 | [diff] [blame] | 82 | void setup_hostinfo(char *buf, int len) |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 83 | { |
| 84 | struct utsname host; |
| 85 | |
| 86 | uname(&host); |
Jeff Dike | b4ffb6a | 2007-05-06 14:50:59 -0700 | [diff] [blame] | 87 | snprintf(buf, len, "%s %s %s %s %s", host.sysname, host.nodename, |
| 88 | host.release, host.version, host.machine); |
Gennady Sharapov | 4fef0c1 | 2006-01-18 17:42:41 -0800 | [diff] [blame] | 89 | } |
| 90 | |
Jeff Dike | 63843c2 | 2007-05-06 14:51:39 -0700 | [diff] [blame] | 91 | void os_dump_core(void) |
| 92 | { |
Lepton Wu | a24864a | 2007-10-16 01:27:35 -0700 | [diff] [blame] | 93 | int pid; |
| 94 | |
Jeff Dike | 63843c2 | 2007-05-06 14:51:39 -0700 | [diff] [blame] | 95 | signal(SIGSEGV, SIG_DFL); |
Lepton Wu | a24864a | 2007-10-16 01:27:35 -0700 | [diff] [blame] | 96 | |
| 97 | /* |
| 98 | * We are about to SIGTERM this entire process group to ensure that |
| 99 | * nothing is around to run after the kernel exits. The |
| 100 | * kernel wants to abort, not die through SIGTERM, so we |
| 101 | * ignore it here. |
| 102 | */ |
| 103 | |
| 104 | signal(SIGTERM, SIG_IGN); |
| 105 | kill(0, SIGTERM); |
| 106 | /* |
| 107 | * Most of the other processes associated with this UML are |
| 108 | * likely sTopped, so give them a SIGCONT so they see the |
| 109 | * SIGTERM. |
| 110 | */ |
| 111 | kill(0, SIGCONT); |
| 112 | |
| 113 | /* |
| 114 | * Now, having sent signals to everyone but us, make sure they |
| 115 | * die by ptrace. Processes can survive what's been done to |
| 116 | * them so far - the mechanism I understand is receiving a |
| 117 | * SIGSEGV and segfaulting immediately upon return. There is |
| 118 | * always a SIGSEGV pending, and (I'm guessing) signals are |
| 119 | * processed in numeric order so the SIGTERM (signal 15 vs |
| 120 | * SIGSEGV being signal 11) is never handled. |
| 121 | * |
| 122 | * Run a waitpid loop until we get some kind of error. |
| 123 | * Hopefully, it's ECHILD, but there's not a lot we can do if |
| 124 | * it's something else. Tell os_kill_ptraced_process not to |
| 125 | * wait for the child to report its death because there's |
| 126 | * nothing reasonable to do if that fails. |
| 127 | */ |
| 128 | |
Stanislaw Gruszka | 4dbed85 | 2007-12-17 16:19:46 -0800 | [diff] [blame] | 129 | while ((pid = waitpid(-1, NULL, WNOHANG | __WALL)) > 0) |
Lepton Wu | a24864a | 2007-10-16 01:27:35 -0700 | [diff] [blame] | 130 | os_kill_ptraced_process(pid, 0); |
| 131 | |
Jeff Dike | 63843c2 | 2007-05-06 14:51:39 -0700 | [diff] [blame] | 132 | abort(); |
| 133 | } |