97870c34b4532 (Alex Dewar 2019-08-25 10:49:18 +0100 1) // SPDX-License-Identifier: GPL-2.0
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 2) /*
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 3) * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 4) * Copyright (C) 2002- 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 5) */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 6)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 7) #include <stdlib.h>
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 8) #include <unistd.h>
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 9) #include <sched.h>
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 10) #include <errno.h>
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 11) #include <string.h>
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 12) #include <sys/mman.h>
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 13) #include <sys/wait.h>
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 14) #include <asm/unistd.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 15) #include <as-layout.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 16) #include <init.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 17) #include <kern_util.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 18) #include <mem.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 19) #include <os.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 20) #include <ptrace_user.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 21) #include <registers.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 22) #include <skas.h>
37185b3324087 (Al Viro 2012-10-08 03:27:32 +0100 23) #include <sysdep/stub.h>
ce4586063f1af (Richard Weinberger 2017-05-04 08:15:10 +0200 24) #include <linux/threads.h>
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 25)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 26) int is_skas_winch(int pid, int fd, void *data)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 27) {
17e052093bcd2 (Al Viro 2011-08-18 20:08:19 +0100 28) return pid == getpgrp();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 29) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 30)
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 31) static const char *ptrace_reg_name(int idx)
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 32) {
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 33) #define R(n) case HOST_##n: return #n
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 34)
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 35) switch (idx) {
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 36) #ifdef __x86_64__
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 37) R(BX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 38) R(CX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 39) R(DI);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 40) R(SI);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 41) R(DX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 42) R(BP);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 43) R(AX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 44) R(R8);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 45) R(R9);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 46) R(R10);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 47) R(R11);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 48) R(R12);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 49) R(R13);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 50) R(R14);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 51) R(R15);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 52) R(ORIG_AX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 53) R(CS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 54) R(SS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 55) R(EFLAGS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 56) #elif defined(__i386__)
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 57) R(IP);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 58) R(SP);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 59) R(EFLAGS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 60) R(AX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 61) R(BX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 62) R(CX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 63) R(DX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 64) R(SI);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 65) R(DI);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 66) R(BP);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 67) R(CS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 68) R(SS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 69) R(DS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 70) R(FS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 71) R(ES);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 72) R(GS);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 73) R(ORIG_AX);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 74) #endif
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 75) }
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 76) return "";
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 77) }
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 78)
f30c2c983e094 (Jeff Dike 2007-05-06 14:51:29 -0700 79) static int ptrace_dump_regs(int pid)
f30c2c983e094 (Jeff Dike 2007-05-06 14:51:29 -0700 80) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 81) unsigned long regs[MAX_REG_NR];
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 82) int i;
f30c2c983e094 (Jeff Dike 2007-05-06 14:51:29 -0700 83)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 84) if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 85) return -errno;
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 86)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 87) printk(UM_KERN_ERR "Stub registers -\n");
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 88) for (i = 0; i < ARRAY_SIZE(regs); i++) {
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 89) const char *regname = ptrace_reg_name(i);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 90)
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 91) printk(UM_KERN_ERR "\t%s\t(%2d): %lx\n", regname, i, regs[i]);
e1e22d0d9183a (Johannes Berg 2021-01-13 22:07:41 +0100 92) }
f30c2c983e094 (Jeff Dike 2007-05-06 14:51:29 -0700 93)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 94) return 0;
f30c2c983e094 (Jeff Dike 2007-05-06 14:51:29 -0700 95) }
f30c2c983e094 (Jeff Dike 2007-05-06 14:51:29 -0700 96)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 97) /*
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 98) * Signals that are OK to receive in the stub - we'll just continue it.
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 99) * SIGWINCH will happen when UML is inside a detached screen.
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 100) */
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 101) #define STUB_SIG_MASK ((1 << SIGALRM) | (1 << SIGWINCH))
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 102)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 103) /* Signals that the stub will finish with - anything else is an error */
ee3d9bd4de1ed (Jeff Dike 2008-02-04 22:30:56 -0800 104) #define STUB_DONE_MASK (1 << SIGTRAP)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 105)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 106) void wait_stub_done(int pid)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 107) {
ae5db6d123416 (Richard Weinberger 2014-07-20 12:56:34 +0200 108) int n, status, err;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 109)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 110) while (1) {
4dbed85a35ed3 (Stanislaw Gruszka 2007-12-17 16:19:46 -0800 111) CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 112) if ((n < 0) || !WIFSTOPPED(status))
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 113) goto bad_wait;
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 114)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 115) if (((1 << WSTOPSIG(status)) & STUB_SIG_MASK) == 0)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 116) break;
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 117)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 118) err = ptrace(PTRACE_CONT, pid, 0, 0);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 119) if (err) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 120) printk(UM_KERN_ERR "wait_stub_done : continue failed, "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 121) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 122) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 123) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 124) }
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 125)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 126) if (((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 127) return;
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 128)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 129) bad_wait:
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 130) err = ptrace_dump_regs(pid);
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 131) if (err)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 132) printk(UM_KERN_ERR "Failed to get registers from stub, "
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 133) "errno = %d\n", -err);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 134) printk(UM_KERN_ERR "wait_stub_done : failed to wait for SIGTRAP, "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 135) "pid = %d, n = %d, errno = %d, status = 0x%x\n", pid, n, errno,
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 136) status);
ae5db6d123416 (Richard Weinberger 2014-07-20 12:56:34 +0200 137) fatal_sigsegv();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 138) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 139)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 140) extern unsigned long current_stub_stack(void);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 141)
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 142) static void get_skas_faultinfo(int pid, struct faultinfo *fi, unsigned long *aux_fp_regs)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 143) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 144) int err;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 145)
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 146) err = get_fp_registers(pid, aux_fp_regs);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 147) if (err < 0) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 148) printk(UM_KERN_ERR "save_fp_registers returned %d\n",
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 149) err);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 150) fatal_sigsegv();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 151) }
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 152) err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 153) if (err) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 154) printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 155) "errno = %d\n", pid, errno);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 156) fatal_sigsegv();
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 157) }
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 158) wait_stub_done(pid);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 159)
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 160) /*
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 161) * faultinfo is prepared by the stub_segv_handler at start of
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 162) * the stub stack page. We just have to copy it.
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 163) */
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 164) memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
2f56debd77a8f (Jeff Dike 2008-02-23 15:23:49 -0800 165)
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 166) err = put_fp_registers(pid, aux_fp_regs);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 167) if (err < 0) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 168) printk(UM_KERN_ERR "put_fp_registers returned %d\n",
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 169) err);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 170) fatal_sigsegv();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 171) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 172) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 173)
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 174) static void handle_segv(int pid, struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 175) {
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 176) get_skas_faultinfo(pid, ®s->faultinfo, aux_fp_regs);
77bf4400319db (Jeff Dike 2007-10-16 01:26:58 -0700 177) segv(regs->faultinfo, 0, 1, NULL);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 178) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 179)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 180) /*
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 181) * To use the same value of using_sysemu as the caller, ask it that value
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 182) * (in local_using_sysemu
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 183) */
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 184) static void handle_trap(int pid, struct uml_pt_regs *regs,
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 185) int local_using_sysemu)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 186) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 187) int err, status;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 188)
e06173bde0ec9 (Jeff Dike 2008-02-04 22:31:12 -0800 189) if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
e06173bde0ec9 (Jeff Dike 2008-02-04 22:31:12 -0800 190) fatal_sigsegv();
e06173bde0ec9 (Jeff Dike 2008-02-04 22:31:12 -0800 191)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 192) if (!local_using_sysemu)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 193) {
966e803ab1253 (Al Viro 2011-08-18 20:12:19 +0100 194) err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 195) __NR_getpid);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 196) if (err < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 197) printk(UM_KERN_ERR "handle_trap - nullifying syscall "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 198) "failed, errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 199) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 200) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 201)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 202) err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 203) if (err < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 204) printk(UM_KERN_ERR "handle_trap - continuing to end of "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 205) "syscall failed, errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 206) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 207) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 208)
4dbed85a35ed3 (Stanislaw Gruszka 2007-12-17 16:19:46 -0800 209) CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 210) if ((err < 0) || !WIFSTOPPED(status) ||
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 211) (WSTOPSIG(status) != SIGTRAP + 0x80)) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 212) err = ptrace_dump_regs(pid);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 213) if (err)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 214) printk(UM_KERN_ERR "Failed to get registers "
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 215) "from process, errno = %d\n", -err);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 216) printk(UM_KERN_ERR "handle_trap - failed to wait at "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 217) "end of syscall, errno = %d, status = %d\n",
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 218) errno, status);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 219) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 220) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 221) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 222)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 223) handle_syscall(regs);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 224) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 225)
5f32943b5e9a4 (Nicolas Iooss 2014-10-12 13:02:13 +0200 226) extern char __syscall_stub_start[];
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 227)
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 228) /**
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 229) * userspace_tramp() - userspace trampoline
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 230) * @stack: pointer to the new userspace stack page, can be NULL, if? FIXME:
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 231) *
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 232) * The userspace trampoline is used to setup a new userspace process in start_userspace() after it was clone()'ed.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 233) * This function will run on a temporary stack page.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 234) * It ptrace()'es itself, then
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 235) * Two pages are mapped into the userspace address space:
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 236) * - STUB_CODE (with EXEC), which contains the skas stub code
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 237) * - STUB_DATA (with R/W), which contains a data page that is used to transfer certain data between the UML userspace process and the UML kernel.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 238) * Also for the userspace process a SIGSEGV handler is installed to catch pagefaults in the userspace process.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 239) * And last the process stops itself to give control to the UML kernel for this userspace process.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 240) *
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 241) * Return: Always zero, otherwise the current userspace process is ended with non null exit() call
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 242) */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 243) static int userspace_tramp(void *stack)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 244) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 245) void *addr;
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 246) int fd;
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 247) unsigned long long offset;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 248)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 249) ptrace(PTRACE_TRACEME, 0, 0, 0);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 250)
a24864a1d52a9 (Lepton Wu 2007-10-16 01:27:35 -0700 251) signal(SIGTERM, SIG_DFL);
ee3d9bd4de1ed (Jeff Dike 2008-02-04 22:30:56 -0800 252) signal(SIGWINCH, SIG_IGN);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 253)
5f32943b5e9a4 (Nicolas Iooss 2014-10-12 13:02:13 +0200 254) fd = phys_mapping(to_phys(__syscall_stub_start), &offset);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 255) addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 256) PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 257) if (addr == MAP_FAILED) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 258) printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 259) "errno = %d\n", STUB_CODE, errno);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 260) exit(1);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 261) }
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 262)
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 263) if (stack != NULL) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 264) fd = phys_mapping(to_phys(stack), &offset);
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 265) addr = mmap((void *) STUB_DATA,
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 266) UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 267) MAP_FIXED | MAP_SHARED, fd, offset);
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 268) if (addr == MAP_FAILED) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 269) printk(UM_KERN_ERR "mapping segfault stack "
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 270) "at 0x%lx failed, errno = %d\n",
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 271) STUB_DATA, errno);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 272) exit(1);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 273) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 274) }
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 275) if (stack != NULL) {
4b84c69b5f6c0 (Jeff Dike 2006-09-25 23:33:04 -0700 276) struct sigaction sa;
4b84c69b5f6c0 (Jeff Dike 2006-09-25 23:33:04 -0700 277)
54ae36f24b103 (Jeff Dike 2007-10-16 01:27:33 -0700 278) unsigned long v = STUB_CODE +
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 279) (unsigned long) stub_segv_handler -
5f32943b5e9a4 (Nicolas Iooss 2014-10-12 13:02:13 +0200 280) (unsigned long) __syscall_stub_start;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 281)
54ae36f24b103 (Jeff Dike 2007-10-16 01:27:33 -0700 282) set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE);
4b84c69b5f6c0 (Jeff Dike 2006-09-25 23:33:04 -0700 283) sigemptyset(&sa.sa_mask);
9b25fcbdc6436 (Al Viro 2011-08-18 20:04:09 +0100 284) sa.sa_flags = SA_ONSTACK | SA_NODEFER | SA_SIGINFO;
9b25fcbdc6436 (Al Viro 2011-08-18 20:04:09 +0100 285) sa.sa_sigaction = (void *) v;
4b84c69b5f6c0 (Jeff Dike 2006-09-25 23:33:04 -0700 286) sa.sa_restorer = NULL;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 287) if (sigaction(SIGSEGV, &sa, NULL) < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 288) printk(UM_KERN_ERR "userspace_tramp - setting SIGSEGV "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 289) "handler failed - errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 290) exit(1);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 291) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 292) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 293)
512b6fb1c14d4 (Jeff Dike 2007-10-16 01:27:11 -0700 294) kill(os_getpid(), SIGSTOP);
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 295) return 0;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 296) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 297)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 298) int userspace_pid[NR_CPUS];
a7d48886cacf8 (Johannes Berg 2021-01-13 22:08:03 +0100 299) int kill_userspace_mm[NR_CPUS];
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 300)
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 301) /**
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 302) * start_userspace() - prepare a new userspace process
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 303) * @stub_stack: pointer to the stub stack. Can be NULL, if? FIXME:
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 304) *
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 305) * Setups a new temporary stack page that is used while userspace_tramp() runs
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 306) * Clones the kernel process into a new userspace process, with FDs only.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 307) *
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 308) * Return: When positive: the process id of the new userspace process,
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 309) * when negative: an error number.
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 310) * FIXME: can PIDs become negative?!
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 311) */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 312) int start_userspace(unsigned long stub_stack)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 313) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 314) void *stack;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 315) unsigned long sp;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 316) int pid, status, n, flags, err;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 317)
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 318) /* setup a temporary stack page */
c539ab73070b3 (Jeff Dike 2007-06-16 10:16:09 -0700 319) stack = mmap(NULL, UM_KERN_PAGE_SIZE,
c539ab73070b3 (Jeff Dike 2007-06-16 10:16:09 -0700 320) PROT_READ | PROT_WRITE | PROT_EXEC,
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 321) MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 322) if (stack == MAP_FAILED) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 323) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 324) printk(UM_KERN_ERR "start_userspace : mmap failed, "
b54988325c4cb (Jeff Dike 2008-02-04 22:31:21 -0800 325) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 326) return err;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 327) }
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 328)
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 329) /* set stack pointer to the end of the stack page, so it can grow downwards */
558f9b2f94dbd (YiFei Zhu 2021-04-20 00:56:10 -0500 330) sp = (unsigned long)stack + UM_KERN_PAGE_SIZE;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 331)
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 332) flags = CLONE_FILES | SIGCHLD;
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 333)
e90998302682c (Thomas Meyer 2017-07-06 00:34:05 +0200 334) /* clone into new userspace process */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 335) pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 336) if (pid < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 337) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 338) printk(UM_KERN_ERR "start_userspace : clone failed, "
b54988325c4cb (Jeff Dike 2008-02-04 22:31:21 -0800 339) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 340) return err;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 341) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 342)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 343) do {
4dbed85a35ed3 (Stanislaw Gruszka 2007-12-17 16:19:46 -0800 344) CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 345) if (n < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 346) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 347) printk(UM_KERN_ERR "start_userspace : wait failed, "
b54988325c4cb (Jeff Dike 2008-02-04 22:31:21 -0800 348) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 349) goto out_kill;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 350) }
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 351) } while (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGALRM));
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 352)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 353) if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 354) err = -EINVAL;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 355) printk(UM_KERN_ERR "start_userspace : expected SIGSTOP, got "
b54988325c4cb (Jeff Dike 2008-02-04 22:31:21 -0800 356) "status = %d\n", status);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 357) goto out_kill;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 358) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 359)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 360) if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 361) (void *) PTRACE_O_TRACESYSGOOD) < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 362) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 363) printk(UM_KERN_ERR "start_userspace : PTRACE_OLDSETOPTIONS "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 364) "failed, errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 365) goto out_kill;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 366) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 367)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 368) if (munmap(stack, UM_KERN_PAGE_SIZE) < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 369) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 370) printk(UM_KERN_ERR "start_userspace : munmap failed, "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 371) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 372) goto out_kill;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 373) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 374)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 375) return pid;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 376)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 377) out_kill:
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 378) os_kill_ptraced_process(pid, 1);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 379) return err;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 380) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 381)
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 382) void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 383) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 384) int err, status, op, pid = userspace_pid[0];
2ea5bc5e5bb51 (Jeff Dike 2007-05-10 22:22:32 -0700 385) /* To prevent races if using_sysemu changes under us.*/
2ea5bc5e5bb51 (Jeff Dike 2007-05-10 22:22:32 -0700 386) int local_using_sysemu;
d3c1cfcdb43e0 (Martin Pärtel 2012-08-02 00:49:17 +0200 387) siginfo_t si;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 388)
b8a420952336e (Al Viro 2012-05-23 00:25:15 -0400 389) /* Handle any immediate reschedules or signals */
b8a420952336e (Al Viro 2012-05-23 00:25:15 -0400 390) interrupt_end();
b8a420952336e (Al Viro 2012-05-23 00:25:15 -0400 391)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 392) while (1) {
a7d48886cacf8 (Johannes Berg 2021-01-13 22:08:03 +0100 393) if (kill_userspace_mm[0])
a7d48886cacf8 (Johannes Berg 2021-01-13 22:08:03 +0100 394) fatal_sigsegv();
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 395)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 396) /*
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 397) * This can legitimately fail if the process loads a
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 398) * bogus value into a segment register. It will
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 399) * segfault and PTRACE_GETREGS will read that value
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 400) * out of the process. However, PTRACE_SETREGS will
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 401) * fail. In this case, there is nothing to do but
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 402) * just kill the process.
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 403) */
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 404) if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp)) {
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 405) printk(UM_KERN_ERR "userspace - ptrace set regs "
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 406) "failed, errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 407) fatal_sigsegv();
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 408) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 409)
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 410) if (put_fp_registers(pid, regs->fp)) {
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 411) printk(UM_KERN_ERR "userspace - ptrace set fp regs "
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 412) "failed, errno = %d\n", errno);
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 413) fatal_sigsegv();
22e19c8d062cc (Thomas Meyer 2017-07-06 00:31:14 +0200 414) }
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 415)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 416) /* Now we set local_using_sysemu to be used for one loop */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 417) local_using_sysemu = get_using_sysemu();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 418)
2ea5bc5e5bb51 (Jeff Dike 2007-05-10 22:22:32 -0700 419) op = SELECT_PTRACE_OPERATION(local_using_sysemu,
2ea5bc5e5bb51 (Jeff Dike 2007-05-10 22:22:32 -0700 420) singlestepping(NULL));
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 421)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 422) if (ptrace(op, pid, 0, 0)) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 423) printk(UM_KERN_ERR "userspace - ptrace continue "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 424) "failed, op = %d, errno = %d\n", op, errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 425) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 426) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 427)
4dbed85a35ed3 (Stanislaw Gruszka 2007-12-17 16:19:46 -0800 428) CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 429) if (err < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 430) printk(UM_KERN_ERR "userspace - wait failed, "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 431) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 432) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 433) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 434)
77bf4400319db (Jeff Dike 2007-10-16 01:26:58 -0700 435) regs->is_user = 1;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 436) if (ptrace(PTRACE_GETREGS, pid, 0, regs->gp)) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 437) printk(UM_KERN_ERR "userspace - PTRACE_GETREGS failed, "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 438) "errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 439) fatal_sigsegv();
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 440) }
d25f2e1235aab (Jeff Dike 2008-02-04 22:30:57 -0800 441)
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 442) if (get_fp_registers(pid, regs->fp)) {
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 443) printk(UM_KERN_ERR "userspace - get_fp_registers failed, "
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 444) "errno = %d\n", errno);
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 445) fatal_sigsegv();
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 446) }
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 447)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 448) UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 449)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 450) if (WIFSTOPPED(status)) {
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 451) int sig = WSTOPSIG(status);
d3c1cfcdb43e0 (Martin Pärtel 2012-08-02 00:49:17 +0200 452)
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 453) /* These signal handlers need the si argument.
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 454) * The SIGIO and SIGALARM handlers which constitute the
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 455) * majority of invocations, do not use it.
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 456) */
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 457) switch (sig) {
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 458) case SIGSEGV:
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 459) case SIGTRAP:
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 460) case SIGILL:
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 461) case SIGBUS:
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 462) case SIGFPE:
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 463) case SIGWINCH:
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 464) ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 465) break;
3c6ac61bc91ea (Anton Ivanov 2020-11-10 13:02:21 +0000 466) }
d3c1cfcdb43e0 (Martin Pärtel 2012-08-02 00:49:17 +0200 467)
5134d8fea06ab (Jeff Dike 2008-02-08 04:22:08 -0800 468) switch (sig) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 469) case SIGSEGV:
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 470) if (PTRACE_FULL_FAULTINFO) {
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 471) get_skas_faultinfo(pid,
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 472) ®s->faultinfo, aux_fp_regs);
9a8c1359571c5 (Richard Weinberger 2013-07-19 11:31:36 +0200 473) (*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
d3c1cfcdb43e0 (Martin Pärtel 2012-08-02 00:49:17 +0200 474) regs);
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 475) }
6f602afda7275 (Thomas Meyer 2017-07-29 17:03:23 +0200 476) else handle_segv(pid, regs, aux_fp_regs);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 477) break;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 478) case SIGTRAP + 0x80:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 479) handle_trap(pid, regs, local_using_sysemu);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 480) break;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 481) case SIGTRAP:
9a8c1359571c5 (Richard Weinberger 2013-07-19 11:31:36 +0200 482) relay_signal(SIGTRAP, (struct siginfo *)&si, regs);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 483) break;
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 484) case SIGALRM:
d2753a6d19979 (Jeff Dike 2007-10-16 01:27:25 -0700 485) break;
d2753a6d19979 (Jeff Dike 2007-10-16 01:27:25 -0700 486) case SIGIO:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 487) case SIGILL:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 488) case SIGBUS:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 489) case SIGFPE:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 490) case SIGWINCH:
0dafcbe128d2a (Johannes Berg 2019-08-23 13:16:23 +0200 491) block_signals_trace();
9a8c1359571c5 (Richard Weinberger 2013-07-19 11:31:36 +0200 492) (*sig_info[sig])(sig, (struct siginfo *)&si, regs);
0dafcbe128d2a (Johannes Berg 2019-08-23 13:16:23 +0200 493) unblock_signals_trace();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 494) break;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 495) default:
96cee3044dca2 (Jeff Dike 2008-05-12 14:01:48 -0700 496) printk(UM_KERN_ERR "userspace - child stopped "
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 497) "with signal %d\n", sig);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 498) fatal_sigsegv();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 499) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 500) pid = userspace_pid[0];
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 501) interrupt_end();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 502)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 503) /* Avoid -ERESTARTSYS handling in host */
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 504) if (PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
18badddaa84e1 (Jeff Dike 2007-10-16 01:27:07 -0700 505) PT_SYSCALL_NR(regs->gp) = -1;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 506) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 507) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 508) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 509)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 510) static unsigned long thread_regs[MAX_REG_NR];
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 511) static unsigned long thread_fp_regs[FP_SIZE];
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 512)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 513) static int __init init_thread_regs(void)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 514) {
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 515) get_safe_registers(thread_regs, thread_fp_regs);
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 516) /* Set parent's instruction pointer to start of clone-stub */
54ae36f24b103 (Jeff Dike 2007-10-16 01:27:33 -0700 517) thread_regs[REGS_IP_INDEX] = STUB_CODE +
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 518) (unsigned long) stub_clone_handler -
5f32943b5e9a4 (Nicolas Iooss 2014-10-12 13:02:13 +0200 519) (unsigned long) __syscall_stub_start;
54ae36f24b103 (Jeff Dike 2007-10-16 01:27:33 -0700 520) thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE -
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 521) sizeof(void *);
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 522) #ifdef __SIGNAL_FRAMESIZE
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 523) thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 524) #endif
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 525) return 0;
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 526) }
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 527)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 528) __initcall(init_thread_regs);
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 529)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 530) int copy_context_skas0(unsigned long new_stack, int pid)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 531) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 532) int err;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 533) unsigned long current_stack = current_stub_stack();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 534) struct stub_data *data = (struct stub_data *) current_stack;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 535) struct stub_data *child_data = (struct stub_data *) new_stack;
0a7675aa204ac (Jeff Dike 2007-10-16 01:27:05 -0700 536) unsigned long long new_offset;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 537) int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 538)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 539) /*
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 540) * prepare offset and fd of child's stack as argument for parent's
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 541) * and child's mmap2 calls
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 542) */
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 543) *data = ((struct stub_data) {
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 544) .offset = MMAP_OFFSET(new_offset),
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 545) .fd = new_fd,
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 546) .parent_err = -ESRCH,
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 547) .child_err = 0,
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 548) });
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 549)
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 550) *child_data = ((struct stub_data) {
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 551) .child_err = -ESRCH,
2eb5f31bc4ea2 (Anton Ivanov 2015-11-02 16:16:37 +0000 552) });
d2753a6d19979 (Jeff Dike 2007-10-16 01:27:25 -0700 553)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 554) err = ptrace_setregs(pid, thread_regs);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 555) if (err < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 556) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 557) printk(UM_KERN_ERR "copy_context_skas0 : PTRACE_SETREGS "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 558) "failed, pid = %d, errno = %d\n", pid, -err);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 559) return err;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 560) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 561)
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 562) err = put_fp_registers(pid, thread_fp_regs);
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 563) if (err < 0) {
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 564) printk(UM_KERN_ERR "copy_context_skas0 : put_fp_registers "
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 565) "failed, pid = %d, err = %d\n", pid, err);
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 566) return err;
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 567) }
fbfe9c847edf5 (Ingo van Lil 2011-09-14 16:21:23 -0700 568)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 569) /*
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 570) * Wait, until parent has finished its work: read child's pid from
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 571) * parent's stack, and check, if bad result.
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 572) */
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 573) err = ptrace(PTRACE_CONT, pid, 0, 0);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 574) if (err) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 575) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 576) printk(UM_KERN_ERR "Failed to continue new process, pid = %d, "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 577) "errno = %d\n", pid, errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 578) return err;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 579) }
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 580)
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 581) wait_stub_done(pid);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 582)
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 583) pid = data->parent_err;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 584) if (pid < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 585) printk(UM_KERN_ERR "copy_context_skas0 - stub-parent reports "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 586) "error %d\n", -pid);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 587) return pid;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 588) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 589)
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 590) /*
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 591) * Wait, until child has finished too: read child's result from
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 592) * child's stack and check it.
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 593) */
16dd07bc6404c (Jeff Dike 2007-05-06 14:51:48 -0700 594) wait_stub_done(pid);
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 595) if (child_data->child_err != STUB_DATA) {
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 596) printk(UM_KERN_ERR "copy_context_skas0 - stub-child %d reports "
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 597) "error %ld\n", pid, data->child_err);
84b2789d61156 (Johannes Berg 2021-01-13 22:09:42 +0100 598) err = data->child_err;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 599) goto out_kill;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 600) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 601)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 602) if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 603) (void *)PTRACE_O_TRACESYSGOOD) < 0) {
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 604) err = -errno;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 605) printk(UM_KERN_ERR "copy_context_skas0 : PTRACE_OLDSETOPTIONS "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 606) "failed, errno = %d\n", errno);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 607) goto out_kill;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 608) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 609)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 610) return pid;
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 611)
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 612) out_kill:
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 613) os_kill_ptraced_process(pid, 1);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 614) return err;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 615) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 616)
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 617) void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 618) {
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 619) (*buf)[0].JB_IP = (unsigned long) handler;
e1a79c400a86f (Jeff Dike 2007-05-10 22:22:31 -0700 620) (*buf)[0].JB_SP = (unsigned long) stack + UM_THREAD_SIZE -
e1a79c400a86f (Jeff Dike 2007-05-10 22:22:31 -0700 621) sizeof(void *);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 622) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 623)
e2216feb37f1d (Jeff Dike 2006-02-07 12:58:43 -0800 624) #define INIT_JMP_NEW_THREAD 0
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 625) #define INIT_JMP_CALLBACK 1
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 626) #define INIT_JMP_HALT 2
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 627) #define INIT_JMP_REBOOT 3
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 628)
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 629) void switch_threads(jmp_buf *me, jmp_buf *you)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 630) {
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 631) if (UML_SETJMP(me) == 0)
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 632) UML_LONGJMP(you, 1);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 633) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 634)
ad28e029789ef (Jeff Dike 2006-04-18 22:21:41 -0700 635) static jmp_buf initial_jmpbuf;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 636)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 637) /* XXX Make these percpu */
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 638) static void (*cb_proc)(void *arg);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 639) static void *cb_arg;
ad28e029789ef (Jeff Dike 2006-04-18 22:21:41 -0700 640) static jmp_buf *cb_back;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 641)
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 642) int start_idle_thread(void *stack, jmp_buf *switch_buf)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 643) {
a5df0d1a2c0f7 (Jeff Dike 2006-07-14 00:24:02 -0700 644) int n;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 645)
00361683ce562 (Al Viro 2011-08-18 20:04:39 +0100 646) set_handler(SIGWINCH);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 647)
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 648) /*
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 649) * Can't use UML_SETJMP or UML_LONGJMP here because they save
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 650) * and restore signals, with the possible side-effect of
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 651) * trying to handle any signals which came when they were
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 652) * blocked, which can't be done on this stack.
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 653) * Signals must be blocked when jumping back here and restored
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 654) * after returning to the jumper.
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 655) */
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 656) n = setjmp(initial_jmpbuf);
5134d8fea06ab (Jeff Dike 2008-02-08 04:22:08 -0800 657) switch (n) {
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 658) case INIT_JMP_NEW_THREAD:
33bbc30654147 (Thomas Meyer 2015-03-28 09:59:46 +0100 659) (*switch_buf)[0].JB_IP = (unsigned long) uml_finishsetup;
3c9173509985b (Jeff Dike 2006-09-27 01:50:40 -0700 660) (*switch_buf)[0].JB_SP = (unsigned long) stack +
e1a79c400a86f (Jeff Dike 2007-05-10 22:22:31 -0700 661) UM_THREAD_SIZE - sizeof(void *);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 662) break;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 663) case INIT_JMP_CALLBACK:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 664) (*cb_proc)(cb_arg);
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 665) longjmp(*cb_back, 1);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 666) break;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 667) case INIT_JMP_HALT:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 668) kmalloc_ok = 0;
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 669) return 0;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 670) case INIT_JMP_REBOOT:
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 671) kmalloc_ok = 0;
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 672) return 1;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 673) default:
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 674) printk(UM_KERN_ERR "Bad sigsetjmp return in "
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 675) "start_idle_thread - %d\n", n);
3e6f2ac480ce3 (Jeff Dike 2008-02-04 22:30:58 -0800 676) fatal_sigsegv();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 677) }
77f6af778dc23 (Jeff Dike 2007-05-06 14:51:40 -0700 678) longjmp(*switch_buf, 1);
7ff1e34bbdc15 (Richard Weinberger 2018-06-15 16:42:56 +0200 679)
7ff1e34bbdc15 (Richard Weinberger 2018-06-15 16:42:56 +0200 680) /* unreachable */
7ff1e34bbdc15 (Richard Weinberger 2018-06-15 16:42:56 +0200 681) printk(UM_KERN_ERR "impossible long jump!");
7ff1e34bbdc15 (Richard Weinberger 2018-06-15 16:42:56 +0200 682) fatal_sigsegv();
7ff1e34bbdc15 (Richard Weinberger 2018-06-15 16:42:56 +0200 683) return 0;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 684) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 685)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 686) void initial_thread_cb_skas(void (*proc)(void *), void *arg)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 687) {
ad28e029789ef (Jeff Dike 2006-04-18 22:21:41 -0700 688) jmp_buf here;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 689)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 690) cb_proc = proc;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 691) cb_arg = arg;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 692) cb_back = &here;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 693)
0dafcbe128d2a (Johannes Berg 2019-08-23 13:16:23 +0200 694) block_signals_trace();
ba180fd437156 (Jeff Dike 2007-10-16 01:27:00 -0700 695) if (UML_SETJMP(&here) == 0)
ad28e029789ef (Jeff Dike 2006-04-18 22:21:41 -0700 696) UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK);
0dafcbe128d2a (Johannes Berg 2019-08-23 13:16:23 +0200 697) unblock_signals_trace();
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 698)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 699) cb_proc = NULL;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 700) cb_arg = NULL;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 701) cb_back = NULL;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 702) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 703)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 704) void halt_skas(void)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 705) {
0dafcbe128d2a (Johannes Berg 2019-08-23 13:16:23 +0200 706) block_signals_trace();
ad28e029789ef (Jeff Dike 2006-04-18 22:21:41 -0700 707) UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 708) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 709)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 710) void reboot_skas(void)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 711) {
0dafcbe128d2a (Johannes Berg 2019-08-23 13:16:23 +0200 712) block_signals_trace();
ad28e029789ef (Jeff Dike 2006-04-18 22:21:41 -0700 713) UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 714) }
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 715)
77bf4400319db (Jeff Dike 2007-10-16 01:26:58 -0700 716) void __switch_mm(struct mm_id *mm_idp)
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 717) {
d0b5e15f0c0fd (Richard Weinberger 2015-03-18 21:31:27 +0100 718) userspace_pid[0] = mm_idp->u.pid;
a7d48886cacf8 (Johannes Berg 2021-01-13 22:08:03 +0100 719) kill_userspace_mm[0] = mm_idp->kill;
abaf69773d8dd (Gennady Sharapov 2006-01-18 17:42:46 -0800 720) }
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