freebsd-dev/sys/alpha/linux/linux_sysvec.c
Peter Wemm 9b68618df0 Add an additional field to the elf brandinfo structure to support
quicker exec-time replacement of the elf interpreter on an emulation
environment where an entire /compat/* tree isn't really warranted.
2003-12-23 02:42:39 +00:00

291 lines
7.7 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 without 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* 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/exec.h>
#include <sys/imgact.h>
#include <sys/imgact_aout.h>
#include <sys/imgact_elf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/sysent.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_page.h>
#include <vm/vm_extern.h>
#include <machine/cpu.h>
#include <machine/md_var.h>
#include <alpha/linux/linux.h>
#include <alpha/linux/linux_proto.h>
#include <compat/linux/linux_mib.h>
#include <compat/linux/linux_util.h>
#undef szsigcode
MODULE_VERSION(linux, 1);
MODULE_DEPEND(linux, osf1, 1, 1, 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
SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
void osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code);
static int elf_linux_fixup(register_t **stack_base,
struct image_params *iparams);
static int exec_linux_imgact_try(struct image_params *iparams);
static int
elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
{
Elf64_Auxargs *args;
register_t *pos;
KASSERT(curthread->td_proc == imgp->proc &&
(curthread->td_proc->p_flag & P_SA) == 0,
("unsafe elf_linux_fixup(), should be curproc"));
args = (Elf64_Auxargs *)imgp->auxargs;
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);
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);
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
(*stack_base)--;
**stack_base = (register_t)imgp->argc;
return 0;
}
/*
* 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(imgp)
struct image_params *imgp;
{
const char *head;
int error;
head = (const char *)imgp->image_header;
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(FIRST_THREAD_IN_PROC(imgp->proc), NULL,
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);
}
/*
* To maintain OSF/1 compat, linux uses BSD signals & errnos on their
* alpha port. This greatly simplfies things for us.
*/
struct sysentvec elf_linux_sysvec = {
LINUX_SYS_MAXSYSCALL,
linux_sysent,
0,
0,
NULL,
0,
NULL,
NULL,
elf_linux_fixup,
osendsig,
linux_sigcode,
&linux_szsigcode,
NULL,
"Linux ELF",
elf64_coredump,
exec_linux_imgact_try,
LINUX_MINSIGSTKSZ,
PAGE_SIZE,
VM_MIN_ADDRESS,
VM_MAXUSER_ADDRESS,
USRSTACK,
PS_STRINGS,
VM_PROT_ALL,
exec_copyout_strings,
exec_setregs,
NULL
};
static Elf64_Brandinfo linux_brand = {
ELFOSABI_LINUX,
EM_ALPHA,
"Linux",
"/compat/linux",
"/lib/ld-linux.so.1",
&elf_linux_sysvec,
NULL,
};
static Elf64_Brandinfo linux_glibc2brand = {
ELFOSABI_LINUX,
EM_ALPHA,
"Linux",
"/compat/linux",
"/lib/ld-linux.so.2",
&elf_linux_sysvec,
NULL,
};
Elf64_Brandinfo *linux_brandlist[] = {
&linux_brand,
&linux_glibc2brand,
NULL
};
static int
linux_elf_modevent(module_t mod, int type, void *data)
{
Elf64_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 (elf64_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 (elf64_brand_inuse(*brandinfo))
error = EBUSY;
if (error == 0) {
for (brandinfo = &linux_brandlist[0];
*brandinfo != NULL; ++brandinfo)
if (elf64_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");
linux_mib_destroy();
} 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
};
DUMMY(rt_sigreturn);
DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);