610ecfe035
copies arguments into the kernel space and one that operates completely in the kernel space; o use kernel-only version of execve(2) to kill another stackgap in linuxlator/i386. Obtained from: DragonFlyBSD (partially) MFC after: 2 weeks
292 lines
7.8 KiB
C
292 lines
7.8 KiB
C
/*-
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* Copyright (c) 1994-1996 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* XXX we use functions that might not exist. */
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#include "opt_compat.h"
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#ifndef COMPAT_43
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#error "Unable to compile Linux-emulator due to missing COMPAT_43 option!"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/imgact_aout.h>
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#include <sys/imgact_elf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/sysent.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <machine/cpu.h>
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#include <machine/md_var.h>
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#include <alpha/linux/linux.h>
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#include <alpha/linux/linux_proto.h>
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#include <compat/linux/linux_mib.h>
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#include <compat/linux/linux_util.h>
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#undef szsigcode
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MODULE_VERSION(linux, 1);
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MODULE_DEPEND(linux, osf1, 1, 1, 1);
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MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
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MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
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MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
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MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define SHELLMAGIC 0x2123 /* #! */
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#else
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#define SHELLMAGIC 0x2321
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#endif
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SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
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void osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code);
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static int elf_linux_fixup(register_t **stack_base,
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struct image_params *iparams);
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static int exec_linux_imgact_try(struct image_params *iparams);
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static int
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elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
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{
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Elf64_Auxargs *args;
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register_t *pos;
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KASSERT(curthread->td_proc == imgp->proc &&
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(curthread->td_proc->p_flag & P_SA) == 0,
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("unsafe elf_linux_fixup(), should be curproc"));
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args = (Elf64_Auxargs *)imgp->auxargs;
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pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
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if (args->trace)
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AUXARGS_ENTRY(pos, AT_DEBUG, 1);
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if (args->execfd != -1)
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AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
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AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
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AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
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AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
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AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
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AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
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AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
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AUXARGS_ENTRY(pos, AT_BASE, args->base);
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AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
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AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
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AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
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AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
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AUXARGS_ENTRY(pos, AT_NULL, 0);
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free(imgp->auxargs, M_TEMP);
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imgp->auxargs = NULL;
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(*stack_base)--;
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**stack_base = (register_t)imgp->args->argc;
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return 0;
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}
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/*
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* If a linux binary is exec'ing something, try this image activator
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* first. We override standard shell script execution in order to
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* be able to modify the interpreter path. We only do this if a linux
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* binary is doing the exec, so we do not create an EXEC module for it.
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*/
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static int
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exec_linux_imgact_try(imgp)
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struct image_params *imgp;
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{
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const char *head;
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int error;
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head = (const char *)imgp->image_header;
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error = -1;
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/*
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* The interpreter for shell scripts run from a linux binary needs
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* to be located in /compat/linux if possible in order to recursively
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* maintain linux path emulation.
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*/
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if (((const short *)head)[0] == SHELLMAGIC) {
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/*
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* Run our normal shell image activator. If it succeeds
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* attempt to use the alternate path for the interpreter. If
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* an alternate path is found, use our stringspace to store it.
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*/
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if ((error = exec_shell_imgact(imgp)) == 0) {
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char *rpath = NULL;
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linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
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imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0);
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if (rpath != imgp->interpreter_name) {
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int len = strlen(rpath) + 1;
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if (len <= MAXSHELLCMDLEN) {
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memcpy(imgp->interpreter_name, rpath,
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len);
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}
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free(rpath, M_TEMP);
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}
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}
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}
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return(error);
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}
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/*
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* To maintain OSF/1 compat, linux uses BSD signals & errnos on their
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* alpha port. This greatly simplfies things for us.
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*/
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struct sysentvec elf_linux_sysvec = {
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LINUX_SYS_MAXSYSCALL,
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linux_sysent,
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0,
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0,
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NULL,
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0,
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NULL,
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NULL,
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elf_linux_fixup,
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osendsig,
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linux_sigcode,
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&linux_szsigcode,
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NULL,
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"Linux ELF",
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elf64_coredump,
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exec_linux_imgact_try,
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LINUX_MINSIGSTKSZ,
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PAGE_SIZE,
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VM_MIN_ADDRESS,
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VM_MAXUSER_ADDRESS,
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USRSTACK,
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PS_STRINGS,
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VM_PROT_ALL,
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exec_copyout_strings,
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exec_setregs,
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NULL
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};
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static Elf64_Brandinfo linux_brand = {
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ELFOSABI_LINUX,
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EM_ALPHA,
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"Linux",
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"/compat/linux",
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"/lib/ld-linux.so.1",
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&elf_linux_sysvec,
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NULL,
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};
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static Elf64_Brandinfo linux_glibc2brand = {
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ELFOSABI_LINUX,
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EM_ALPHA,
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"Linux",
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"/compat/linux",
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"/lib/ld-linux.so.2",
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&elf_linux_sysvec,
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NULL,
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};
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Elf64_Brandinfo *linux_brandlist[] = {
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&linux_brand,
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&linux_glibc2brand,
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NULL
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};
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static int
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linux_elf_modevent(module_t mod, int type, void *data)
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{
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Elf64_Brandinfo **brandinfo;
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int error;
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struct linux_ioctl_handler **lihp;
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error = 0;
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switch(type) {
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case MOD_LOAD:
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for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
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++brandinfo)
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if (elf64_insert_brand_entry(*brandinfo) < 0)
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error = EINVAL;
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if (error == 0) {
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SET_FOREACH(lihp, linux_ioctl_handler_set)
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linux_ioctl_register_handler(*lihp);
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if (bootverbose)
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printf("Linux ELF exec handler installed\n");
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} else
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printf("cannot insert Linux ELF brand handler\n");
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break;
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case MOD_UNLOAD:
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for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
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++brandinfo)
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if (elf64_brand_inuse(*brandinfo))
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error = EBUSY;
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if (error == 0) {
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for (brandinfo = &linux_brandlist[0];
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*brandinfo != NULL; ++brandinfo)
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if (elf64_remove_brand_entry(*brandinfo) < 0)
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error = EINVAL;
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}
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if (error == 0) {
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SET_FOREACH(lihp, linux_ioctl_handler_set)
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linux_ioctl_unregister_handler(*lihp);
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if (bootverbose)
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printf("Linux ELF exec handler removed\n");
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linux_mib_destroy();
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} else
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printf("Could not deinstall ELF interpreter entry\n");
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break;
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default:
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return (EOPNOTSUPP);
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break;
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}
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return error;
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}
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static moduledata_t linux_elf_mod = {
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"linuxelf",
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linux_elf_modevent,
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0
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};
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DUMMY(rt_sigreturn);
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DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
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