384 lines
8.5 KiB
C
384 lines
8.5 KiB
C
/* 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 SVR4-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/buf.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/signalvar.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/module.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_prot.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <sys/exec.h>
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#include <sys/kernel.h>
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#include <machine/cpu.h>
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#include <netinet/in.h>
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#include <svr4/svr4.h>
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#include <svr4/svr4_types.h>
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#include <svr4/svr4_syscall.h>
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#include <svr4/svr4_signal.h>
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#include <svr4/svr4_sockio.h>
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#include <svr4/svr4_socket.h>
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#include <svr4/svr4_errno.h>
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#include <svr4/svr4_proto.h>
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#include <svr4/svr4_siginfo.h>
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#include <svr4/svr4_util.h>
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extern int bsd_to_svr4_sig[];
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extern int svr4_to_bsd_sig[];
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int bsd_to_svr4_errno[ELAST+1] = {
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0,
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SVR4_EPERM,
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SVR4_ENOENT,
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SVR4_ESRCH,
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SVR4_EINTR,
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SVR4_EIO,
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SVR4_ENXIO,
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SVR4_E2BIG,
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SVR4_ENOEXEC,
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SVR4_EBADF,
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SVR4_ECHILD,
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SVR4_EDEADLK,
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SVR4_ENOMEM,
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SVR4_EACCES,
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SVR4_EFAULT,
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SVR4_ENOTBLK,
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SVR4_EBUSY,
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SVR4_EEXIST,
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SVR4_EXDEV,
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SVR4_ENODEV,
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SVR4_ENOTDIR,
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SVR4_EISDIR,
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SVR4_EINVAL,
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SVR4_ENFILE,
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SVR4_EMFILE,
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SVR4_ENOTTY,
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SVR4_ETXTBSY,
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SVR4_EFBIG,
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SVR4_ENOSPC,
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SVR4_ESPIPE,
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SVR4_EROFS,
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SVR4_EMLINK,
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SVR4_EPIPE,
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SVR4_EDOM,
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SVR4_ERANGE,
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SVR4_EAGAIN,
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SVR4_EINPROGRESS,
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SVR4_EALREADY,
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SVR4_ENOTSOCK,
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SVR4_EDESTADDRREQ,
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SVR4_EMSGSIZE,
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SVR4_EPROTOTYPE,
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SVR4_ENOPROTOOPT,
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SVR4_EPROTONOSUPPORT,
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SVR4_ESOCKTNOSUPPORT,
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SVR4_EOPNOTSUPP,
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SVR4_EPFNOSUPPORT,
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SVR4_EAFNOSUPPORT,
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SVR4_EADDRINUSE,
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SVR4_EADDRNOTAVAIL,
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SVR4_ENETDOWN,
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SVR4_ENETUNREACH,
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SVR4_ENETRESET,
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SVR4_ECONNABORTED,
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SVR4_ECONNRESET,
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SVR4_ENOBUFS,
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SVR4_EISCONN,
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SVR4_ENOTCONN,
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SVR4_ESHUTDOWN,
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SVR4_ETOOMANYREFS,
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SVR4_ETIMEDOUT,
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SVR4_ECONNREFUSED,
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SVR4_ELOOP,
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SVR4_ENAMETOOLONG,
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SVR4_EHOSTDOWN,
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SVR4_EHOSTUNREACH,
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SVR4_ENOTEMPTY,
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SVR4_EPROCLIM,
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SVR4_EUSERS,
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SVR4_EDQUOT,
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SVR4_ESTALE,
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SVR4_EREMOTE,
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SVR4_EBADRPC,
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SVR4_ERPCMISMATCH,
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SVR4_EPROGUNAVAIL,
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SVR4_EPROGMISMATCH,
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SVR4_EPROCUNAVAIL,
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SVR4_ENOLCK,
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SVR4_ENOSYS,
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SVR4_EFTYPE,
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SVR4_EAUTH,
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SVR4_ENEEDAUTH,
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SVR4_EIDRM,
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SVR4_ENOMSG,
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};
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static int svr4_fixup(long **stack_base, struct image_params *imgp);
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extern struct sysent svr4_sysent[];
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#undef szsigcode
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#undef sigcode
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extern int svr4_szsigcode;
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extern char svr4_sigcode[];
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struct sysentvec svr4_sysvec = {
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SVR4_SYS_MAXSYSCALL,
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svr4_sysent,
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0xff,
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NSIG,
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bsd_to_svr4_sig,
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ELAST, /* ELAST */
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bsd_to_svr4_errno,
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0,
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svr4_fixup,
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svr4_sendsig,
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svr4_sigcode,
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&svr4_szsigcode,
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0,
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"SVR4"
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};
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Elf32_Brandinfo svr4_brand = {
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"SVR4",
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"/compat/svr4",
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"/lib/libc.so.1",
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&svr4_sysvec
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};
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const char svr4_emul_path[] = "/compat/svr4";
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static int
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svr4_fixup(long **stack_base, struct image_params *imgp)
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{
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Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
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long *pos;
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pos = *stack_base + (imgp->argc + imgp->envc + 2);
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if (args->trace) {
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AUXARGS_ENTRY(pos, AT_DEBUG, 1);
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}
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if (args->execfd != -1) {
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AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
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}
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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_cred->p_ruid);
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AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_cred->p_svuid);
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AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_cred->p_rgid);
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AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_cred->p_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 = (int)imgp->argc;
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return 0;
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}
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/*
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* Search an alternate path before passing pathname arguments on
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* to system calls. Useful for keeping a seperate 'emulation tree'.
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*
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* If cflag is set, we check if an attempt can be made to create
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* the named file, i.e. we check if the directory it should
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* be in exists.
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*
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* Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
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*/
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int
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svr4_emul_find(p, sgp, prefix, path, pbuf, cflag)
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struct proc *p;
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caddr_t *sgp; /* Pointer to stackgap memory */
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const char *prefix;
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char *path;
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char **pbuf;
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int cflag;
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{
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struct nameidata nd;
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struct nameidata ndroot;
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struct vattr vat;
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struct vattr vatroot;
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int error;
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char *ptr, *buf, *cp;
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size_t sz, len;
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buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
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*pbuf = path;
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for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
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continue;
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sz = MAXPATHLEN - (ptr - buf);
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/*
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* If sgp is not given then the path is already in kernel space
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*/
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if (sgp == NULL)
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error = copystr(path, ptr, sz, &len);
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else
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error = copyinstr(path, ptr, sz, &len);
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if (error) {
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free(buf, M_TEMP);
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return error;
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}
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if (*ptr != '/') {
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free(buf, M_TEMP);
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return EINVAL;
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}
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/*
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* We know that there is a / somewhere in this pathname.
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* Search backwards for it, to find the file's parent dir
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* to see if it exists in the alternate tree. If it does,
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* and we want to create a file (cflag is set). We don't
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* need to worry about the root comparison in this case.
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*/
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if (cflag) {
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for (cp = &ptr[len] - 1; *cp != '/'; cp--);
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*cp = '\0';
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
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if ((error = namei(&nd)) != 0) {
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free(buf, M_TEMP);
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return error;
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}
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*cp = '/';
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}
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else {
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
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if ((error = namei(&nd)) != 0) {
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free(buf, M_TEMP);
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return error;
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}
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/*
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* We now compare the vnode of the svr4_root to the one
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* vnode asked. If they resolve to be the same, then we
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* ignore the match so that the real root gets used.
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* This avoids the problem of traversing "../.." to find the
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* root directory and never finding it, because "/" resolves
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* to the emulation root directory. This is expensive :-(
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*/
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NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
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p);
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if ((error = namei(&ndroot)) != 0) {
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/* Cannot happen! */
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free(buf, M_TEMP);
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vrele(nd.ni_vp);
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return error;
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}
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if ((error = VOP_GETATTR(nd.ni_vp, &vat, p->p_ucred, p)) != 0) {
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goto done;
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}
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if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, p->p_ucred, p))
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!= 0) {
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goto done;
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}
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if (vat.va_fsid == vatroot.va_fsid &&
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vat.va_fileid == vatroot.va_fileid) {
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error = ENOENT;
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goto done;
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}
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}
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if (sgp == NULL)
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*pbuf = buf;
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else {
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sz = &ptr[len] - buf;
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*pbuf = stackgap_alloc(sgp, sz + 1);
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error = copyout(buf, *pbuf, sz);
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free(buf, M_TEMP);
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}
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done:
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vrele(nd.ni_vp);
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if (!cflag)
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vrele(ndroot.ni_vp);
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return error;
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}
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/*
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* XXX: wrong, for the same reason described in linux_sysvec.c
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*/
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static int svr4_elf_modevent __P((module_t mod, int type, void *data));
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static int
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svr4_elf_modevent(module_t mod, int type, void *data)
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{
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int error;
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error = 0;
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switch(type) {
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case MOD_LOAD:
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if (elf_insert_brand_entry(&svr4_brand) < 0)
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error = EINVAL;
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if (error)
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printf("cannot insert svr4 elf brand handler\n");
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else if (bootverbose)
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printf("svr4 ELF exec handler installed\n");
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break;
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case MOD_UNLOAD:
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/* Only allow the emulator to be removed if it isn't in use. */
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if (elf_brand_inuse(&svr4_brand) != 0) {
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error = EBUSY;
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} else if (elf_remove_brand_entry(&svr4_brand) < 0) {
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error = EINVAL;
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}
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if (error)
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printf("Could not deinstall ELF interpreter entry (error %d)\n",
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error);
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else if (bootverbose)
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printf("svr4 ELF exec handler removed\n");
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break;
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default:
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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 svr4_elf_mod = {
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"svr4elf",
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svr4_elf_modevent,
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0
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};
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DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
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