862 lines
24 KiB
C
862 lines
24 KiB
C
/*-
|
|
* Copyright (c) 1994-1996 Søren Schmidt
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in this position and unchanged.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software withough specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/* XXX we use functions that might not exist. */
|
|
#include "opt_compat.h"
|
|
|
|
#ifndef COMPAT_43
|
|
#error "Unable to compile Linux-emulator due to missing COMPAT_43 option!"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/imgact_aout.h>
|
|
#include <sys/imgact_elf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/sysproto.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <machine/cpu.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
|
|
#include <i386/linux/linux.h>
|
|
#include <i386/linux/linux_proto.h>
|
|
#include <compat/linux/linux_signal.h>
|
|
#include <compat/linux/linux_util.h>
|
|
|
|
MODULE_VERSION(linux, 1);
|
|
MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
|
|
MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
|
|
MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
|
|
|
|
MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
|
|
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
#define SHELLMAGIC 0x2123 /* #! */
|
|
#else
|
|
#define SHELLMAGIC 0x2321
|
|
#endif
|
|
|
|
extern char linux_sigcode[];
|
|
extern int linux_szsigcode;
|
|
|
|
extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
|
|
|
|
SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
|
|
|
|
static int linux_fixup __P((register_t **stack_base,
|
|
struct image_params *iparams));
|
|
static int elf_linux_fixup __P((register_t **stack_base,
|
|
struct image_params *iparams));
|
|
static void linux_prepsyscall __P((struct trapframe *tf, int *args,
|
|
u_int *code, caddr_t *params));
|
|
static void linux_sendsig __P((sig_t catcher, int sig, sigset_t *mask,
|
|
u_long code));
|
|
|
|
/*
|
|
* Linux syscalls return negative errno's, we do positive and map them
|
|
*/
|
|
static int bsd_to_linux_errno[ELAST + 1] = {
|
|
-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
|
|
-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
|
|
-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
|
|
-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
|
|
-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
|
|
-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
|
|
-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
|
|
-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
|
|
-6, -6, -43, -42, -75, -6, -84
|
|
};
|
|
|
|
int bsd_to_linux_signal[LINUX_SIGTBLSZ] = {
|
|
LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL,
|
|
LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE,
|
|
LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, 0,
|
|
LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG,
|
|
LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD,
|
|
LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU,
|
|
LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH,
|
|
0, LINUX_SIGUSR1, LINUX_SIGUSR2
|
|
};
|
|
|
|
int linux_to_bsd_signal[LINUX_SIGTBLSZ] = {
|
|
SIGHUP, SIGINT, SIGQUIT, SIGILL,
|
|
SIGTRAP, SIGABRT, SIGBUS, SIGFPE,
|
|
SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
|
|
SIGPIPE, SIGALRM, SIGTERM, SIGBUS,
|
|
SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP,
|
|
SIGTTIN, SIGTTOU, SIGURG, SIGXCPU,
|
|
SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH,
|
|
SIGIO, SIGURG, 0
|
|
};
|
|
|
|
/*
|
|
* If FreeBSD & Linux have a difference of opinion about what a trap
|
|
* means, deal with it here.
|
|
*/
|
|
static int
|
|
translate_traps(int signal, int trap_code)
|
|
{
|
|
if (signal != SIGBUS)
|
|
return signal;
|
|
switch (trap_code) {
|
|
case T_PROTFLT:
|
|
case T_TSSFLT:
|
|
case T_DOUBLEFLT:
|
|
case T_PAGEFLT:
|
|
return SIGSEGV;
|
|
default:
|
|
return signal;
|
|
}
|
|
}
|
|
|
|
static int
|
|
linux_fixup(register_t **stack_base, struct image_params *imgp)
|
|
{
|
|
register_t *argv, *envp;
|
|
|
|
argv = *stack_base;
|
|
envp = *stack_base + (imgp->argc + 1);
|
|
(*stack_base)--;
|
|
**stack_base = (intptr_t)(void *)envp;
|
|
(*stack_base)--;
|
|
**stack_base = (intptr_t)(void *)argv;
|
|
(*stack_base)--;
|
|
**stack_base = imgp->argc;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
|
|
{
|
|
Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
|
|
register_t *pos;
|
|
|
|
pos = *stack_base + (imgp->argc + imgp->envc + 2);
|
|
|
|
if (args->trace) {
|
|
AUXARGS_ENTRY(pos, AT_DEBUG, 1);
|
|
}
|
|
if (args->execfd != -1) {
|
|
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
|
|
}
|
|
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
|
|
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
|
|
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
|
|
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
|
|
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
|
|
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
|
|
AUXARGS_ENTRY(pos, AT_BASE, args->base);
|
|
PROC_LOCK(imgp->proc);
|
|
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
|
|
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
|
|
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
|
|
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
|
|
PROC_UNLOCK(imgp->proc);
|
|
AUXARGS_ENTRY(pos, AT_NULL, 0);
|
|
|
|
free(imgp->auxargs, M_TEMP);
|
|
imgp->auxargs = NULL;
|
|
|
|
(*stack_base)--;
|
|
**stack_base = (long)imgp->argc;
|
|
return 0;
|
|
}
|
|
|
|
extern int _ucodesel, _udatasel;
|
|
extern unsigned long linux_sznonrtsigcode;
|
|
|
|
static void
|
|
linux_rt_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
|
|
{
|
|
register struct proc *p = curproc;
|
|
register struct trapframe *regs;
|
|
struct linux_rt_sigframe *fp, frame;
|
|
int oonstack;
|
|
|
|
regs = p->p_frame;
|
|
oonstack = sigonstack(regs->tf_esp);
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(sigreturn))
|
|
printf(ARGS(rt_sendsig, "%p, %d, %p, %lu"),
|
|
catcher, sig, (void*)mask, code);
|
|
#endif
|
|
/*
|
|
* Allocate space for the signal handler context.
|
|
*/
|
|
PROC_LOCK(p);
|
|
if ((p->p_flag & P_ALTSTACK) && !oonstack &&
|
|
SIGISMEMBER(p->p_sigacts->ps_sigonstack, sig)) {
|
|
fp = (struct linux_rt_sigframe *)(p->p_sigstk.ss_sp +
|
|
p->p_sigstk.ss_size - sizeof(struct linux_rt_sigframe));
|
|
} else
|
|
fp = (struct linux_rt_sigframe *)regs->tf_esp - 1;
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* grow() will return FALSE if the fp will not fit inside the stack
|
|
* and the stack can not be grown. useracc will return FALSE
|
|
* if access is denied.
|
|
*/
|
|
if ((grow_stack (p, (int)fp) == FALSE) ||
|
|
!useracc((caddr_t)fp, sizeof (struct linux_rt_sigframe),
|
|
VM_PROT_WRITE)) {
|
|
/*
|
|
* Process has trashed its stack; give it an illegal
|
|
* instruction to halt it in its tracks.
|
|
*/
|
|
PROC_LOCK(p);
|
|
SIGACTION(p, SIGILL) = SIG_DFL;
|
|
SIGDELSET(p->p_sigignore, SIGILL);
|
|
SIGDELSET(p->p_sigcatch, SIGILL);
|
|
SIGDELSET(p->p_sigmask, SIGILL);
|
|
#ifdef DEBUG
|
|
if (ldebug(sigreturn))
|
|
printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
|
|
fp, oonstack);
|
|
#endif
|
|
psignal(p, SIGILL);
|
|
PROC_UNLOCK(p);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Build the argument list for the signal handler.
|
|
*/
|
|
if (p->p_sysent->sv_sigtbl)
|
|
if (sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
frame.sf_handler = catcher;
|
|
frame.sf_sig = sig;
|
|
frame.sf_siginfo = &fp->sf_si;
|
|
frame.sf_ucontext = &fp->sf_sc;
|
|
|
|
/* Fill siginfo structure. */
|
|
frame.sf_si.lsi_signo = sig;
|
|
frame.sf_si.lsi_code = code;
|
|
frame.sf_si.lsi_addr = (void *)regs->tf_err;
|
|
|
|
/*
|
|
* Build the signal context to be used by sigreturn.
|
|
*/
|
|
frame.sf_sc.uc_flags = 0; /* XXX ??? */
|
|
frame.sf_sc.uc_link = NULL; /* XXX ??? */
|
|
|
|
PROC_LOCK(p);
|
|
frame.sf_sc.uc_stack.ss_sp = p->p_sigstk.ss_sp;
|
|
frame.sf_sc.uc_stack.ss_size = p->p_sigstk.ss_size;
|
|
frame.sf_sc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK)
|
|
? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
|
|
PROC_UNLOCK(p);
|
|
|
|
bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
|
|
|
|
frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0];
|
|
frame.sf_sc.uc_mcontext.sc_gs = rgs();
|
|
frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
|
|
frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
|
|
frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
|
|
frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi;
|
|
frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi;
|
|
frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp;
|
|
frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx;
|
|
frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx;
|
|
frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx;
|
|
frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax;
|
|
frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip;
|
|
frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
|
|
frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
|
|
frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
|
|
frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
|
|
frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
|
|
frame.sf_sc.uc_mcontext.sc_trapno = code; /* XXX ???? */
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(sigreturn))
|
|
printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
|
|
frame.sf_sc.uc_stack.ss_flags, p->p_sigstk.ss_sp,
|
|
p->p_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
|
|
#endif
|
|
|
|
if (copyout(&frame, fp, sizeof(frame)) != 0) {
|
|
/*
|
|
* Process has trashed its stack; give it an illegal
|
|
* instruction to halt it in its tracks.
|
|
*/
|
|
PROC_LOCK(p);
|
|
sigexit(p, SIGILL);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Build context to run handler in.
|
|
*/
|
|
regs->tf_esp = (int)fp;
|
|
regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode) +
|
|
linux_sznonrtsigcode;
|
|
regs->tf_eflags &= ~PSL_VM;
|
|
regs->tf_cs = _ucodesel;
|
|
regs->tf_ds = _udatasel;
|
|
regs->tf_es = _udatasel;
|
|
regs->tf_fs = _udatasel;
|
|
regs->tf_ss = _udatasel;
|
|
}
|
|
|
|
|
|
/*
|
|
* Send an interrupt to process.
|
|
*
|
|
* Stack is set up to allow sigcode stored
|
|
* in u. to call routine, followed by kcall
|
|
* to sigreturn routine below. After sigreturn
|
|
* resets the signal mask, the stack, and the
|
|
* frame pointer, it returns to the user
|
|
* specified pc, psl.
|
|
*/
|
|
|
|
static void
|
|
linux_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
|
|
{
|
|
register struct proc *p = curproc;
|
|
register struct trapframe *regs;
|
|
struct linux_sigframe *fp, frame;
|
|
linux_sigset_t lmask;
|
|
int oonstack, i;
|
|
|
|
if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
|
|
/* Signal handler installed with SA_SIGINFO. */
|
|
linux_rt_sendsig(catcher, sig, mask, code);
|
|
return;
|
|
}
|
|
|
|
regs = p->p_frame;
|
|
oonstack = sigonstack(regs->tf_esp);
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(sigreturn))
|
|
printf(ARGS(sendsig, "%p, %d, %p, %lu"),
|
|
catcher, sig, (void*)mask, code);
|
|
#endif
|
|
|
|
/*
|
|
* Allocate space for the signal handler context.
|
|
*/
|
|
PROC_LOCK(p);
|
|
if ((p->p_flag & P_ALTSTACK) && !oonstack &&
|
|
SIGISMEMBER(p->p_sigacts->ps_sigonstack, sig)) {
|
|
fp = (struct linux_sigframe *)(p->p_sigstk.ss_sp +
|
|
p->p_sigstk.ss_size - sizeof(struct linux_sigframe));
|
|
} else
|
|
fp = (struct linux_sigframe *)regs->tf_esp - 1;
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* grow() will return FALSE if the fp will not fit inside the stack
|
|
* and the stack can not be grown. useracc will return FALSE
|
|
* if access is denied.
|
|
*/
|
|
if ((grow_stack (p, (int)fp) == FALSE) ||
|
|
!useracc((caddr_t)fp, sizeof (struct linux_sigframe),
|
|
VM_PROT_WRITE)) {
|
|
/*
|
|
* Process has trashed its stack; give it an illegal
|
|
* instruction to halt it in its tracks.
|
|
*/
|
|
PROC_LOCK(p);
|
|
SIGACTION(p, SIGILL) = SIG_DFL;
|
|
SIGDELSET(p->p_sigignore, SIGILL);
|
|
SIGDELSET(p->p_sigcatch, SIGILL);
|
|
SIGDELSET(p->p_sigmask, SIGILL);
|
|
psignal(p, SIGILL);
|
|
PROC_UNLOCK(p);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Build the argument list for the signal handler.
|
|
*/
|
|
if (p->p_sysent->sv_sigtbl)
|
|
if (sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
frame.sf_handler = catcher;
|
|
frame.sf_sig = sig;
|
|
|
|
bsd_to_linux_sigset(mask, &lmask);
|
|
|
|
/*
|
|
* Build the signal context to be used by sigreturn.
|
|
*/
|
|
frame.sf_sc.sc_mask = lmask.__bits[0];
|
|
frame.sf_sc.sc_gs = rgs();
|
|
frame.sf_sc.sc_fs = regs->tf_fs;
|
|
frame.sf_sc.sc_es = regs->tf_es;
|
|
frame.sf_sc.sc_ds = regs->tf_ds;
|
|
frame.sf_sc.sc_edi = regs->tf_edi;
|
|
frame.sf_sc.sc_esi = regs->tf_esi;
|
|
frame.sf_sc.sc_ebp = regs->tf_ebp;
|
|
frame.sf_sc.sc_ebx = regs->tf_ebx;
|
|
frame.sf_sc.sc_edx = regs->tf_edx;
|
|
frame.sf_sc.sc_ecx = regs->tf_ecx;
|
|
frame.sf_sc.sc_eax = regs->tf_eax;
|
|
frame.sf_sc.sc_eip = regs->tf_eip;
|
|
frame.sf_sc.sc_cs = regs->tf_cs;
|
|
frame.sf_sc.sc_eflags = regs->tf_eflags;
|
|
frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
|
|
frame.sf_sc.sc_ss = regs->tf_ss;
|
|
frame.sf_sc.sc_err = regs->tf_err;
|
|
frame.sf_sc.sc_trapno = code; /* XXX ???? */
|
|
|
|
bzero(&frame.sf_fpstate, sizeof(struct linux_fpstate));
|
|
|
|
for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
|
|
frame.sf_extramask[i] = lmask.__bits[i+1];
|
|
|
|
if (copyout(&frame, fp, sizeof(frame)) != 0) {
|
|
/*
|
|
* Process has trashed its stack; give it an illegal
|
|
* instruction to halt it in its tracks.
|
|
*/
|
|
PROC_LOCK(p);
|
|
sigexit(p, SIGILL);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Build context to run handler in.
|
|
*/
|
|
regs->tf_esp = (int)fp;
|
|
regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
|
|
regs->tf_eflags &= ~PSL_VM;
|
|
regs->tf_cs = _ucodesel;
|
|
regs->tf_ds = _udatasel;
|
|
regs->tf_es = _udatasel;
|
|
regs->tf_fs = _udatasel;
|
|
regs->tf_ss = _udatasel;
|
|
}
|
|
|
|
/*
|
|
* System call to cleanup state after a signal
|
|
* has been taken. Reset signal mask and
|
|
* stack state from context left by sendsig (above).
|
|
* Return to previous pc and psl as specified by
|
|
* context left by sendsig. Check carefully to
|
|
* make sure that the user has not modified the
|
|
* psl to gain improper privileges or to cause
|
|
* a machine fault.
|
|
*/
|
|
int
|
|
linux_sigreturn(p, args)
|
|
struct proc *p;
|
|
struct linux_sigreturn_args *args;
|
|
{
|
|
struct linux_sigframe frame;
|
|
register struct trapframe *regs;
|
|
linux_sigset_t lmask;
|
|
int eflags, i;
|
|
|
|
regs = p->p_frame;
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(sigreturn))
|
|
printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
|
|
#endif
|
|
/*
|
|
* The trampoline code hands us the sigframe.
|
|
* It is unsafe to keep track of it ourselves, in the event that a
|
|
* program jumps out of a signal handler.
|
|
*/
|
|
if (copyin((caddr_t)args->sfp, &frame, sizeof(frame)) != 0)
|
|
return (EFAULT);
|
|
|
|
/*
|
|
* Check for security violations.
|
|
*/
|
|
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
|
|
eflags = frame.sf_sc.sc_eflags;
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF. The
|
|
* cpu sets PSL_RF in tf_eflags for faults. Debuggers should
|
|
* sometimes set it there too. tf_eflags is kept in the signal
|
|
* context during signal handling and there is no other place
|
|
* to remember it, so the PSL_RF bit may be corrupted by the
|
|
* signal handler without us knowing. Corruption of the PSL_RF
|
|
* bit at worst causes one more or one less debugger trap, so
|
|
* allowing it is fairly harmless.
|
|
*/
|
|
if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
|
|
return(EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
|
|
if (!CS_SECURE(frame.sf_sc.sc_cs)) {
|
|
trapsignal(p, SIGBUS, T_PROTFLT);
|
|
return(EINVAL);
|
|
}
|
|
|
|
lmask.__bits[0] = frame.sf_sc.sc_mask;
|
|
for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
|
|
lmask.__bits[i+1] = frame.sf_extramask[i];
|
|
PROC_LOCK(p);
|
|
linux_to_bsd_sigset(&lmask, &p->p_sigmask);
|
|
SIG_CANTMASK(p->p_sigmask);
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Restore signal context.
|
|
*/
|
|
/* %gs was restored by the trampoline. */
|
|
regs->tf_fs = frame.sf_sc.sc_fs;
|
|
regs->tf_es = frame.sf_sc.sc_es;
|
|
regs->tf_ds = frame.sf_sc.sc_ds;
|
|
regs->tf_edi = frame.sf_sc.sc_edi;
|
|
regs->tf_esi = frame.sf_sc.sc_esi;
|
|
regs->tf_ebp = frame.sf_sc.sc_ebp;
|
|
regs->tf_ebx = frame.sf_sc.sc_ebx;
|
|
regs->tf_edx = frame.sf_sc.sc_edx;
|
|
regs->tf_ecx = frame.sf_sc.sc_ecx;
|
|
regs->tf_eax = frame.sf_sc.sc_eax;
|
|
regs->tf_eip = frame.sf_sc.sc_eip;
|
|
regs->tf_cs = frame.sf_sc.sc_cs;
|
|
regs->tf_eflags = eflags;
|
|
regs->tf_esp = frame.sf_sc.sc_esp_at_signal;
|
|
regs->tf_ss = frame.sf_sc.sc_ss;
|
|
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* System call to cleanup state after a signal
|
|
* has been taken. Reset signal mask and
|
|
* stack state from context left by rt_sendsig (above).
|
|
* Return to previous pc and psl as specified by
|
|
* context left by sendsig. Check carefully to
|
|
* make sure that the user has not modified the
|
|
* psl to gain improper privileges or to cause
|
|
* a machine fault.
|
|
*/
|
|
int
|
|
linux_rt_sigreturn(p, args)
|
|
struct proc *p;
|
|
struct linux_rt_sigreturn_args *args;
|
|
{
|
|
struct sigaltstack_args sasargs;
|
|
struct linux_ucontext uc;
|
|
struct linux_sigcontext *context;
|
|
linux_stack_t *lss;
|
|
stack_t *ss;
|
|
register struct trapframe *regs;
|
|
int eflags;
|
|
caddr_t sg = stackgap_init();
|
|
|
|
regs = p->p_frame;
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(rt_sigreturn))
|
|
printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
|
|
#endif
|
|
/*
|
|
* The trampoline code hands us the ucontext.
|
|
* It is unsafe to keep track of it ourselves, in the event that a
|
|
* program jumps out of a signal handler.
|
|
*/
|
|
if (copyin((caddr_t)args->ucp, &uc, sizeof(uc)) != 0)
|
|
return (EFAULT);
|
|
|
|
context = &uc.uc_mcontext;
|
|
|
|
/*
|
|
* Check for security violations.
|
|
*/
|
|
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
|
|
eflags = context->sc_eflags;
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF. The
|
|
* cpu sets PSL_RF in tf_eflags for faults. Debuggers should
|
|
* sometimes set it there too. tf_eflags is kept in the signal
|
|
* context during signal handling and there is no other place
|
|
* to remember it, so the PSL_RF bit may be corrupted by the
|
|
* signal handler without us knowing. Corruption of the PSL_RF
|
|
* bit at worst causes one more or one less debugger trap, so
|
|
* allowing it is fairly harmless.
|
|
*/
|
|
if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
|
|
return(EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
|
|
if (!CS_SECURE(context->sc_cs)) {
|
|
trapsignal(p, SIGBUS, T_PROTFLT);
|
|
return(EINVAL);
|
|
}
|
|
|
|
PROC_LOCK(p);
|
|
linux_to_bsd_sigset(&uc.uc_sigmask, &p->p_sigmask);
|
|
SIG_CANTMASK(p->p_sigmask);
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Restore signal context
|
|
*/
|
|
/* %gs was restored by the trampoline. */
|
|
regs->tf_fs = context->sc_fs;
|
|
regs->tf_es = context->sc_es;
|
|
regs->tf_ds = context->sc_ds;
|
|
regs->tf_edi = context->sc_edi;
|
|
regs->tf_esi = context->sc_esi;
|
|
regs->tf_ebp = context->sc_ebp;
|
|
regs->tf_ebx = context->sc_ebx;
|
|
regs->tf_edx = context->sc_edx;
|
|
regs->tf_ecx = context->sc_ecx;
|
|
regs->tf_eax = context->sc_eax;
|
|
regs->tf_eip = context->sc_eip;
|
|
regs->tf_cs = context->sc_cs;
|
|
regs->tf_eflags = eflags;
|
|
regs->tf_esp = context->sc_esp_at_signal;
|
|
regs->tf_ss = context->sc_ss;
|
|
|
|
/*
|
|
* call sigaltstack & ignore results..
|
|
*/
|
|
ss = stackgap_alloc(&sg, sizeof(stack_t));
|
|
lss = &uc.uc_stack;
|
|
ss->ss_sp = lss->ss_sp;
|
|
ss->ss_size = lss->ss_size;
|
|
ss->ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(rt_sigreturn))
|
|
printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
|
|
ss->ss_flags, ss->ss_sp, ss->ss_size, context->sc_mask);
|
|
#endif
|
|
sasargs.ss = ss;
|
|
sasargs.oss = NULL;
|
|
(void) sigaltstack(p, &sasargs);
|
|
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
static void
|
|
linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, caddr_t *params)
|
|
{
|
|
args[0] = tf->tf_ebx;
|
|
args[1] = tf->tf_ecx;
|
|
args[2] = tf->tf_edx;
|
|
args[3] = tf->tf_esi;
|
|
args[4] = tf->tf_edi;
|
|
*params = NULL; /* no copyin */
|
|
}
|
|
|
|
/*
|
|
* If a linux binary is exec'ing something, try this image activator
|
|
* first. We override standard shell script execution in order to
|
|
* be able to modify the interpreter path. We only do this if a linux
|
|
* binary is doing the exec, so we do not create an EXEC module for it.
|
|
*/
|
|
static int exec_linux_imgact_try __P((struct image_params *iparams));
|
|
|
|
static int
|
|
exec_linux_imgact_try(imgp)
|
|
struct image_params *imgp;
|
|
{
|
|
const char *head = (const char *)imgp->image_header;
|
|
int error = -1;
|
|
|
|
/*
|
|
* The interpreter for shell scripts run from a linux binary needs
|
|
* to be located in /compat/linux if possible in order to recursively
|
|
* maintain linux path emulation.
|
|
*/
|
|
if (((const short *)head)[0] == SHELLMAGIC) {
|
|
/*
|
|
* Run our normal shell image activator. If it succeeds attempt
|
|
* to use the alternate path for the interpreter. If an alternate
|
|
* path is found, use our stringspace to store it.
|
|
*/
|
|
if ((error = exec_shell_imgact(imgp)) == 0) {
|
|
char *rpath = NULL;
|
|
|
|
linux_emul_find(imgp->proc, NULL, linux_emul_path,
|
|
imgp->interpreter_name, &rpath, 0);
|
|
if (rpath != imgp->interpreter_name) {
|
|
int len = strlen(rpath) + 1;
|
|
|
|
if (len <= MAXSHELLCMDLEN) {
|
|
memcpy(imgp->interpreter_name, rpath, len);
|
|
}
|
|
free(rpath, M_TEMP);
|
|
}
|
|
}
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
struct sysentvec linux_sysvec = {
|
|
LINUX_SYS_MAXSYSCALL,
|
|
linux_sysent,
|
|
0xff,
|
|
LINUX_SIGTBLSZ,
|
|
bsd_to_linux_signal,
|
|
ELAST + 1,
|
|
bsd_to_linux_errno,
|
|
translate_traps,
|
|
linux_fixup,
|
|
linux_sendsig,
|
|
linux_sigcode,
|
|
&linux_szsigcode,
|
|
linux_prepsyscall,
|
|
"Linux a.out",
|
|
aout_coredump,
|
|
exec_linux_imgact_try,
|
|
LINUX_MINSIGSTKSZ
|
|
};
|
|
|
|
struct sysentvec elf_linux_sysvec = {
|
|
LINUX_SYS_MAXSYSCALL,
|
|
linux_sysent,
|
|
0xff,
|
|
LINUX_SIGTBLSZ,
|
|
bsd_to_linux_signal,
|
|
ELAST + 1,
|
|
bsd_to_linux_errno,
|
|
translate_traps,
|
|
elf_linux_fixup,
|
|
linux_sendsig,
|
|
linux_sigcode,
|
|
&linux_szsigcode,
|
|
linux_prepsyscall,
|
|
"Linux ELF",
|
|
elf_coredump,
|
|
exec_linux_imgact_try,
|
|
LINUX_MINSIGSTKSZ
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_brand = {
|
|
ELFOSABI_LINUX,
|
|
"Linux",
|
|
"/compat/linux",
|
|
"/lib/ld-linux.so.1",
|
|
&elf_linux_sysvec
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_glibc2brand = {
|
|
ELFOSABI_LINUX,
|
|
"Linux",
|
|
"/compat/linux",
|
|
"/lib/ld-linux.so.2",
|
|
&elf_linux_sysvec
|
|
};
|
|
|
|
Elf32_Brandinfo *linux_brandlist[] = {
|
|
&linux_brand,
|
|
&linux_glibc2brand,
|
|
NULL
|
|
};
|
|
|
|
static int
|
|
linux_elf_modevent(module_t mod, int type, void *data)
|
|
{
|
|
Elf32_Brandinfo **brandinfo;
|
|
int error;
|
|
struct linux_ioctl_handler **lihp;
|
|
|
|
error = 0;
|
|
|
|
switch(type) {
|
|
case MOD_LOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
|
|
if (elf_insert_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_register_handler(*lihp);
|
|
if (bootverbose)
|
|
printf("Linux ELF exec handler installed\n");
|
|
} else
|
|
printf("cannot insert Linux ELF brand handler\n");
|
|
break;
|
|
case MOD_UNLOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
|
|
if (elf_brand_inuse(*brandinfo))
|
|
error = EBUSY;
|
|
if (error == 0) {
|
|
for (brandinfo = &linux_brandlist[0];
|
|
*brandinfo != NULL; ++brandinfo)
|
|
if (elf_remove_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
}
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_unregister_handler(*lihp);
|
|
if (bootverbose)
|
|
printf("Linux ELF exec handler removed\n");
|
|
} else
|
|
printf("Could not deinstall ELF interpreter entry\n");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static moduledata_t linux_elf_mod = {
|
|
"linuxelf",
|
|
linux_elf_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
|