NetBSD/sys/kern/exec_subr.c

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/* $NetBSD: exec_subr.c,v 1.35 2003/02/26 21:18:23 matt Exp $ */
/*
* Copyright (c) 1993, 1994, 1996 Christopher G. Demetriou
* 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.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou.
* 4. 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
*
* 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.
*/
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#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.35 2003/02/26 21:18:23 matt Exp $");
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
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#include <sys/filedesc.h>
#include <sys/exec.h>
#include <sys/mman.h>
#include <uvm/uvm.h>
/*
* XXX cgd 960926: this module should collect simple statistics
* (calls, extends, kills).
*/
#ifdef DEBUG
/*
* new_vmcmd():
* create a new vmcmd structure and fill in its fields based
* on function call arguments. make sure objects ref'd by
* the vmcmd are 'held'.
*
* If not debugging, this is a macro, so it's expanded inline.
*/
void
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new_vmcmd(struct exec_vmcmd_set *evsp,
int (*proc)(struct proc * p, struct exec_vmcmd *),
u_long len, u_long addr, struct vnode *vp, u_long offset,
u_int prot, int flags)
{
struct exec_vmcmd *vcp;
if (evsp->evs_used >= evsp->evs_cnt)
vmcmdset_extend(evsp);
vcp = &evsp->evs_cmds[evsp->evs_used++];
vcp->ev_proc = proc;
vcp->ev_len = len;
vcp->ev_addr = addr;
if ((vcp->ev_vp = vp) != NULL)
vref(vp);
vcp->ev_offset = offset;
vcp->ev_prot = prot;
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vcp->ev_flags = flags;
}
#endif /* DEBUG */
void
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vmcmdset_extend(struct exec_vmcmd_set *evsp)
{
struct exec_vmcmd *nvcp;
u_int ocnt;
#ifdef DIAGNOSTIC
if (evsp->evs_used < evsp->evs_cnt)
panic("vmcmdset_extend: not necessary");
#endif
/* figure out number of entries in new set */
ocnt = evsp->evs_cnt;
evsp->evs_cnt += ocnt ? ocnt : EXEC_DEFAULT_VMCMD_SETSIZE;
/* allocate it */
nvcp = malloc(evsp->evs_cnt * sizeof(struct exec_vmcmd),
M_EXEC, M_WAITOK);
/* free the old struct, if there was one, and record the new one */
if (ocnt) {
memcpy(nvcp, evsp->evs_cmds,
(ocnt * sizeof(struct exec_vmcmd)));
free(evsp->evs_cmds, M_EXEC);
}
evsp->evs_cmds = nvcp;
}
void
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kill_vmcmds(struct exec_vmcmd_set *evsp)
{
struct exec_vmcmd *vcp;
u_int i;
if (evsp->evs_cnt == 0)
return;
for (i = 0; i < evsp->evs_used; i++) {
vcp = &evsp->evs_cmds[i];
if (vcp->ev_vp != NULLVP)
vrele(vcp->ev_vp);
}
evsp->evs_used = evsp->evs_cnt = 0;
free(evsp->evs_cmds, M_EXEC);
}
/*
* vmcmd_map_pagedvn():
* handle vmcmd which specifies that a vnode should be mmap'd.
* appropriate for handling demand-paged text and data segments.
*/
int
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vmcmd_map_pagedvn(struct proc *p, struct exec_vmcmd *cmd)
{
struct uvm_object *uobj;
int error;
KASSERT(cmd->ev_vp->v_flag & VTEXT);
/*
* map the vnode in using uvm_map.
*/
if (cmd->ev_len == 0)
return(0);
if (cmd->ev_offset & PAGE_MASK)
return(EINVAL);
if (cmd->ev_addr & PAGE_MASK)
return(EINVAL);
if (cmd->ev_len & PAGE_MASK)
return(EINVAL);
/*
* first, attach to the object
*/
uobj = uvn_attach(cmd->ev_vp, VM_PROT_READ|VM_PROT_EXECUTE);
if (uobj == NULL)
return(ENOMEM);
VREF(cmd->ev_vp);
/*
* do the map
*/
error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr, cmd->ev_len,
uobj, cmd->ev_offset, 0,
UVM_MAPFLAG(cmd->ev_prot, VM_PROT_ALL, UVM_INH_COPY,
UVM_ADV_NORMAL, UVM_FLAG_COPYONW|UVM_FLAG_FIXED));
if (error) {
uobj->pgops->pgo_detach(uobj);
}
return error;
}
/*
* vmcmd_map_readvn():
* handle vmcmd which specifies that a vnode should be read from.
* appropriate for non-demand-paged text/data segments, i.e. impure
* objects (a la OMAGIC and NMAGIC).
*/
int
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vmcmd_map_readvn(struct proc *p, struct exec_vmcmd *cmd)
{
int error;
long diff;
if (cmd->ev_len == 0)
return 0;
diff = cmd->ev_addr - trunc_page(cmd->ev_addr);
cmd->ev_addr -= diff; /* required by uvm_map */
cmd->ev_offset -= diff;
cmd->ev_len += diff;
error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr,
round_page(cmd->ev_len), NULL, UVM_UNKNOWN_OFFSET, 0,
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY,
UVM_ADV_NORMAL,
UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
if (error)
return error;
return vmcmd_readvn(p, cmd);
}
int
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vmcmd_readvn(struct proc *p, struct exec_vmcmd *cmd)
{
int error;
error = vn_rdwr(UIO_READ, cmd->ev_vp, (caddr_t)cmd->ev_addr,
cmd->ev_len, cmd->ev_offset, UIO_USERSPACE, IO_UNIT,
p->p_ucred, NULL, p);
if (error)
return error;
#ifdef PMAP_NEED_PROCWR
/*
* we had to write the process, make sure the pages are synched
* with the instruction cache.
*/
if (cmd->ev_prot & VM_PROT_EXECUTE)
pmap_procwr(p, cmd->ev_addr, cmd->ev_len);
#endif
if (cmd->ev_prot != (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)) {
/*
* we had to map in the area at PROT_ALL so that vn_rdwr()
* could write to it. however, the caller seems to want
* it mapped read-only, so now we are going to have to call
* uvm_map_protect() to fix up the protection. ICK.
*/
return uvm_map_protect(&p->p_vmspace->vm_map,
trunc_page(cmd->ev_addr),
round_page(cmd->ev_addr + cmd->ev_len),
cmd->ev_prot, FALSE);
}
return 0;
}
/*
* vmcmd_map_zero():
* handle vmcmd which specifies a zero-filled address space region. The
* address range must be first allocated, then protected appropriately.
*/
int
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vmcmd_map_zero(struct proc *p, struct exec_vmcmd *cmd)
{
int error;
long diff;
diff = cmd->ev_addr - trunc_page(cmd->ev_addr);
cmd->ev_addr -= diff; /* required by uvm_map */
cmd->ev_len += diff;
error = uvm_map(&p->p_vmspace->vm_map, &cmd->ev_addr,
round_page(cmd->ev_len), NULL, UVM_UNKNOWN_OFFSET, 0,
UVM_MAPFLAG(cmd->ev_prot, UVM_PROT_ALL, UVM_INH_COPY,
UVM_ADV_NORMAL,
UVM_FLAG_FIXED|UVM_FLAG_COPYONW));
return error;
}
/*
* exec_read_from():
*
* Read from vnode into buffer at offset.
*/
int
exec_read_from(struct proc *p, struct vnode *vp, u_long off, void *buf,
size_t size)
{
int error;
size_t resid;
if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE,
0, p->p_ucred, &resid, p)) != 0)
return error;
/*
* See if we got all of it
*/
if (resid != 0)
return ENOEXEC;
return 0;
}