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dynamic executable/loader handling, done right

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This commit is contained in:
cgd 1999-04-27 05:38:08 +00:00
parent e85db685e9
commit 6ef8f59ae6
1 changed files with 116 additions and 9 deletions
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125
sys/compat/osf1/osf1_exec.c
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@ -1,4 +1,4 @@
/* $NetBSD: osf1_exec.c,v 1.3 1999/04/27 03:19:44 cgd Exp $ */
/* $NetBSD: osf1_exec.c,v 1.4 1999/04/27 05:38:08 cgd Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
@ -112,7 +112,7 @@ osf1_exec_ecoff_hook(struct proc *p, struct exec_package *epp)
switch (execp->f.f_flags & ECOFF_FLAG_OBJECT_TYPE_MASK) {
case ECOFF_OBJECT_TYPE_SHARABLE:
/* can't exec a shared library! */
#if 1
#if 0
uprintf("can't execute OSF/1 shared libraries\n");
#endif
error = ENOEXEC;
@ -127,20 +127,30 @@ osf1_exec_ecoff_hook(struct proc *p, struct exec_package *epp)
error = 0;
break;
}
if (error) {
free(epp->ep_emul_arg, M_TEMP);
epp->ep_emul_arg = NULL;
kill_vmcmds(&epp->ep_vmcmds); /* if any */
}
return (error);
}
static int
osf1_exec_ecoff_dynamic(struct proc *p, struct exec_package *epp)
{
#if 1
uprintf("OSF/1 dynamically linked binaries not yet supported\n");
return ENOEXEC;
#else
struct osf1_exec_emul_arg *emul_arg = epp->ep_emul_arg;
struct ecoff_exechdr ldr_exechdr;
struct nameidata nd;
struct vnode *ldr_vp;
const char *pathbuf;
size_t resid;
int error;
/*
* locate the loader
*/
error = emul_find(p, NULL, osf1_emul_path,
OSF1_LDR_EXEC_DEFAULT_LOADER, &pathbuf, 0);
/* includes /emul/osf1 if appropriate */
@ -149,10 +159,107 @@ osf1_exec_ecoff_dynamic(struct proc *p, struct exec_package *epp)
if (!error)
free((char *)pathbuf, M_TEMP);
#if 0
uprintf("loader is %s\n", emul_arg->loader_name);
return ENOEXEC;
#endif
/*
* open the loader, see if it's an ECOFF executable,
* make sure the object type is amenable, then arrange to
* load it up.
*/
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
emul_arg->loader_name, p);
if ((error = namei(&nd)) != 0)
goto bad;
ldr_vp = nd.ni_vp;
/*
* Basic access checks. Reject if:
* not a regular file
* exec not allowed on binary
* exec not allowed on mount point
*/
if (ldr_vp->v_type != VREG) {
error = EACCES;
goto badunlock;
}
if ((error = VOP_ACCESS(ldr_vp, VEXEC, p->p_ucred, p)) != 0)
goto badunlock;
if (ldr_vp->v_mount->mnt_flag & MNT_NOEXEC) {
error = EACCES;
goto badunlock;
}
/*
* If loader's mount point disallows set-id execution,
* disable set-id.
*/
if (ldr_vp->v_mount->mnt_flag & MNT_NOSUID)
epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID);
VOP_UNLOCK(ldr_vp, 0);
/*
* read the header, and make sure we got all of it.
*/
if ((error = vn_rdwr(UIO_READ, ldr_vp, (caddr_t)&ldr_exechdr,
sizeof ldr_exechdr, 0, UIO_SYSSPACE, 0, p->p_ucred,
&resid, p)) != 0)
goto bad;
if (resid != 0) {
error = ENOEXEC;
goto bad;
}
/*
* Check the magic. We expect it to be the native Alpha ECOFF
* (Digital UNIX) magic number. Also make sure it's not a shared
* lib or dynamically linked executable.
*/
if (ldr_exechdr.f.f_magic != ECOFF_MAGIC_ALPHA) {
error = ENOEXEC;
goto bad;
}
switch (ldr_exechdr.f.f_flags & ECOFF_FLAG_OBJECT_TYPE_MASK) {
case ECOFF_OBJECT_TYPE_SHARABLE:
case ECOFF_OBJECT_TYPE_CALL_SHARED:
/* can't exec shared lib or dynamically linked executable. */
error = ENOEXEC;
goto bad;
}
switch (ldr_exechdr.a.magic) {
case ECOFF_OMAGIC:
error = exec_ecoff_prep_omagic(p, epp, &ldr_exechdr, ldr_vp);
break;
case ECOFF_NMAGIC:
error = exec_ecoff_prep_nmagic(p, epp, &ldr_exechdr, ldr_vp);
break;
case ECOFF_ZMAGIC:
error = exec_ecoff_prep_zmagic(p, epp, &ldr_exechdr, ldr_vp);
break;
default:
error = ENOEXEC;
}
if (error)
goto bad;
/* finally, set up the stack. */
error = exec_ecoff_setup_stack(p, epp);
if (error)
goto bad;
vrele(ldr_vp);
return (0);
badunlock:
VOP_UNLOCK(ldr_vp, 0);
bad:
vrele(ldr_vp);
return (error);
}
/*
@ -220,7 +327,7 @@ osf1_copyargs(pack, arginfo, stack, argp)
stack = (caddr_t)stack + len;
out:
FREE(pack->ep_emul_arg, M_TEMP);
free(pack->ep_emul_arg, M_TEMP);
pack->ep_emul_arg = NULL;
return stack;