cap.c revision 5aefb6555731130ca4fd295960123d71f2d21fe8
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "_synonyms.h"
#include <sys/types.h>
#include <sys/mman.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <debug.h>
#include <conv.h>
#include "_rtld.h"
#include "_audit.h"
#include "msg.h"
/*
* qsort(3c) comparison function.
*/
static int
compare(const void *fdesc1, const void *fdesc2)
{
ulong_t hwcap1 = ((Fdesc *)fdesc1)->fd_fmap.fm_hwptr;
ulong_t hwcap2 = ((Fdesc *)fdesc2)->fd_fmap.fm_hwptr;
if (hwcap1 && (hwcap2 == 0))
return (-1);
if ((hwcap1 == 0) && hwcap2)
return (1);
if ((hwcap1 == 0) && (hwcap2 == 0))
return (0);
if (hwcap1 > hwcap2)
return (-1);
if (hwcap1 < hwcap2)
return (1);
return (0);
}
/*
* If this object defines a set of hardware capability requirements, insure the
* kernal can cope with them.
*/
int
hwcap_check(Rej_desc *rej, Ehdr *ehdr)
{
Cap *cptr;
Phdr *phdr;
int cnt;
/* LINTED */
phdr = (Phdr *)((char *)ehdr + ehdr->e_phoff);
for (cnt = 0; cnt < ehdr->e_phnum; cnt++, phdr++) {
Lword val;
if (phdr->p_type != PT_SUNWCAP)
continue;
/* LINTED */
cptr = (Cap *)((char *)ehdr + phdr->p_offset);
while (cptr->c_tag != CA_SUNW_NULL) {
if (cptr->c_tag == CA_SUNW_HW_1)
break;
cptr++;
}
if (cptr->c_tag == CA_SUNW_NULL)
break;
if ((val = (cptr->c_un.c_val & ~hwcap)) != 0) {
rej->rej_type = SGS_REJ_HWCAP_1;
rej->rej_str = conv_cap_val_hw1(val, M_MACH);
return (0);
}
/*
* Retain this hardware capabilities pointer for possible later
* inspection should this object be processed as a filtee.
*/
fmap->fm_hwptr = cptr->c_un.c_val;
}
return (1);
}
static void
remove_fdesc(Fdesc *fdp)
{
#if defined(MAP_ALIGN)
if (fdp->fd_fmap.fm_maddr &&
((fdp->fd_fmap.fm_mflags & MAP_ALIGN) == 0)) {
#else
if (fdp->fd_fmap.fm_maddr) {
#endif
(void) munmap(fdp->fd_fmap.fm_maddr, fdp->fd_fmap.fm_msize);
/*
* Note, this file descriptor might be duplicating information
* from the global fmap descriptor. If so, clean up the global
* descriptor to prevent a duplicate (unnecessary) unmap.
*/
if (fmap->fm_maddr == fdp->fd_fmap.fm_maddr)
fmap->fm_maddr = 0;
}
if (fdp->fd_fd)
(void) close(fdp->fd_fd);
if (fdp->fd_pname && (fdp->fd_pname != fdp->fd_nname))
free((void *)fdp->fd_pname);
if (fdp->fd_nname)
free((void *)fdp->fd_nname);
}
/*
* When $HWCAP is used to represent dependencies, take the associated directory
* and analyze all the files it contains.
*/
int
hwcap_dir(Alist **fdalpp, Lm_list *lml, const char *name, Rt_map *clmp,
uint_t flags, Rej_desc *rej)
{
char path[PATH_MAX], *dst;
const char *src;
DIR *dir;
struct dirent *dirent;
Aliste off;
Alist *fdalp = 0;
Fdesc *fdp;
int error = 0;
/*
* Access the directory in preparation for reading its entries. If
* successful, establish the initial pathname.
*/
if ((dir = opendir(name)) == 0) {
Rej_desc _rej = { 0 };
_rej.rej_type = SGS_REJ_STR;
_rej.rej_name = name;
_rej.rej_str = strerror(errno);
DBG_CALL(Dbg_file_rejected(lml, &_rej));
rejection_inherit(rej, &_rej, 0);
return (0);
}
for (dst = path, src = name; *src; dst++, src++)
*dst = *src;
*dst++ = '/';
/*
* Read each entry from the directory and determine whether it is a
* valid ELF file.
*/
while ((dirent = readdir(dir)) != NULL) {
const char *file = dirent->d_name;
char *_dst;
Fdesc fdesc = { 0 };
Rej_desc _rej = { 0 };
/*
* Ignore "." and ".." entries.
*/
if ((file[0] == '.') && ((file[1] == '\0') ||
((file[1] == '.') && (file[2] == '\0'))))
continue;
/*
* Complete the full pathname, and verify its usability.
*/
for (_dst = dst, src = file, file = dst; *src; _dst++, src++)
*_dst = *src;
*_dst = '\0';
if ((name = strdup(path)) == 0) {
error = 1;
break;
}
if ((name = load_trace(lml, name, clmp)) == 0)
continue;
if (find_path(lml, name, clmp, flags, &fdesc, &_rej) == 0)
rejection_inherit(rej, &_rej, &fdesc);
else {
DBG_CALL(Dbg_cap_hw_candidate(lml, name));
/*
* If this object has already been loaded, obtain the
* hardware capabilities for later sorting. Otherwise
* we have a new candidate.
*/
if (fdesc.fd_lmp)
fdesc.fd_fmap.fm_hwptr = HWCAP(fdesc.fd_lmp);
else
fdesc.fd_fmap = *fmap;
if (alist_append(&fdalp, &fdesc,
sizeof (Fdesc), 10) == 0) {
remove_fdesc(&fdesc);
error = 1;
break;
}
}
/*
* Clear the global file mapping structure so that the mapping
* for this file won't be overriden.
*/
fmap->fm_mflags = MAP_PRIVATE;
fmap->fm_maddr = 0;
fmap->fm_msize = syspagsz;
fmap->fm_hwptr = 0;
}
(void) closedir(dir);
/*
* If no objects have been found, we're done. Also, if an allocation
* error occurred while processing any object, remove any objects that
* had already been added to the list and return.
*/
if ((fdalp == 0) || error) {
if (fdalp) {
for (ALIST_TRAVERSE(fdalp, off, fdp))
remove_fdesc(fdp);
free(fdalp);
}
return (0);
}
/*
* Having processed and retained all candidates from this directory,
* sort them, based on the precedence of their hardware capabilities.
*/
qsort(&(fdalp->al_data[0]), ((fdalp->al_next - (sizeof (Alist) -
sizeof (void *))) / fdalp->al_size), fdalp->al_size, compare);
*fdalpp = fdalp;
return (1);
}
static Pnode *
_hwcap_filtees(Pnode **pnpp, Aliste nlmco, Rt_map *flmp, const char *ref,
const char *dir, int mode, uint_t flags)
{
Alist *fdalp = 0;
Aliste off;
Pnode *fpnp = 0, *lpnp, *npnp = (*pnpp)->p_next;
Fdesc *fdp;
Lm_list *lml = LIST(flmp);
int unused = 0;
Rej_desc rej = { 0 };
if (hwcap_dir(&fdalp, lml, dir, flmp, flags, &rej) == 0) {
remove_rej(&rej);
return (0);
}
/*
* Now complete the mapping of each of the ordered objects, adding
* each object to a new Pnode.
*/
for (ALIST_TRAVERSE(fdalp, off, fdp)) {
Rt_map *nlmp;
Grp_hdl *ghp = 0;
Pnode *pnp;
int audit = 0;
if (unused) {
/*
* Flush out objects remaining.
*/
remove_fdesc(fdp);
continue;
}
/*
* Complete mapping the file, obtaining a handle, and continue
* to analyze the object, establishing dependencies and
* relocating. Remove the file descriptor at this point, as it
* is no longer required.
*/
DBG_CALL(Dbg_file_filtee(lml, NAME(flmp), fdp->fd_nname, 0));
nlmp = load_path(lml, nlmco, fdp->fd_nname, flmp, mode,
(flags | FLG_RT_HANDLE), &ghp, fdp, &rej);
remove_fdesc(fdp);
/*
* Create a new Pnode to represent this filtee, and substitute
* the calling Pnode (which was used to represent the hardware
* capability directory).
*/
if ((pnp = calloc(1, sizeof (Pnode))) == 0) {
if (ghp)
(void) dlclose_core(ghp, flmp);
return (0);
}
if ((pnp->p_name = strdup(NAME(nlmp))) == 0) {
if (ghp)
(void) dlclose_core(ghp, flmp);
free(pnp);
return (0);
}
pnp->p_len = strlen(NAME(nlmp));
pnp->p_info = (void *)ghp;
pnp->p_next = npnp;
if (fpnp == 0) {
Pnode *opnp = (*pnpp);
/*
* If this is the first pnode, reuse the original after
* freeing any of its pathnames.
*/
if (opnp->p_name)
free((void *)opnp->p_name);
if (opnp->p_oname)
free((void *)opnp->p_oname);
*opnp = *pnp;
free((void *)pnp);
fpnp = lpnp = pnp = opnp;
} else {
lpnp->p_next = pnp;
lpnp = pnp;
}
/*
* Establish the filter handle to prevent any recursion.
*/
if (nlmp && ghp) {
ghp->gh_flags |= GPH_FILTEE;
pnp->p_info = (void *)ghp;
}
/*
* Audit the filter/filtee established. A return of 0
* indicates the auditor wishes to ignore this filtee.
*/
if (nlmp && (lml->lm_tflags | FLAGS1(flmp)) &
LML_TFLG_AUD_OBJFILTER) {
if (audit_objfilter(flmp, ref, nlmp, 0) == 0) {
audit = 1;
nlmp = 0;
}
}
/*
* Finish processing the objects associated with this request.
*/
if (nlmp && ghp && ((analyze_lmc(lml, nlmco, nlmp) == 0) ||
(relocate_lmc(lml, nlmco, nlmp) == 0)))
nlmp = 0;
/*
* Finally, if the filtee is part of a link-map control list
* that is equivalent, or less, than the filter control list,
* create an association between the filter and filtee. This
* association provides sufficient information to tear down the
* filter and filtee if necessary.
*/
if (nlmp && ghp && (CNTL(nlmp) <= CNTL(flmp)) &&
(hdl_add(ghp, flmp, GPD_FILTER) == 0))
nlmp = 0;
/*
* If this object is marked an end-filtee, we're done.
*/
if (nlmp && ghp && (FLAGS1(nlmp) & FL1_RT_ENDFILTE))
unused = 1;
/*
* Generate a diagnostic if the filtee couldn't be loaded, null
* out the pnode entry, and continue the search.
*/
if (nlmp == 0) {
pnp->p_info = 0;
DBG_CALL(Dbg_file_filtee(lml, 0, pnp->p_name, audit));
if (ghp)
(void) dlclose_core(ghp, flmp);
pnp->p_len = 0;
}
}
free(fdalp);
return (fpnp);
}
Pnode *
hwcap_filtees(Pnode **pnpp, Aliste nlmco, Dyninfo *dip, Rt_map *flmp,
const char *ref, int mode, uint_t flags)
{
Pnode *pnp = *pnpp;
const char *dir = pnp->p_name;
Lm_list *flml = LIST(flmp);
DBG_CALL(Dbg_cap_hw_filter(flml, dir, flmp));
if ((pnp = _hwcap_filtees(pnpp, nlmco, flmp, ref, dir, mode,
flags)) != 0)
return (pnp);
/*
* If no hardware capability filtees have been found, provide suitable
* diagnostics and mark the incoming Pnode as unused.
*/
if ((flml->lm_flags & LML_FLG_TRC_ENABLE) &&
(dip->di_flags & FLG_DI_AUXFLTR) && (rtld_flags & RT_FL_WARNFLTR))
(void) printf(MSG_INTL(MSG_LDD_HWCAP_NFOUND), dir);
DBG_CALL(Dbg_cap_hw_filter(flml, dir, 0));
pnp = *pnpp;
pnp->p_len = 0;
return (pnp);
}
/*
* Load an individual hardware capabilities object.
*/
Rt_map *
load_hwcap(Lm_list *lml, Aliste lmco, const char *dir, Rt_map *clmp,
uint_t mode, uint_t flags, Grp_hdl **hdl, Rej_desc *rej)
{
Alist *fdalp = 0;
Aliste off;
Fdesc *fdp;
int found = 0;
Rt_map *lmp = 0;
/*
* Obtain the sorted list of hardware capabilites objects available.
*/
if (hwcap_dir(&fdalp, lml, dir, clmp, flags, rej) == 0)
return (0);
/*
* From the list of hardware capability objects, use the first and
* discard the rest.
*/
for (ALIST_TRAVERSE(fdalp, off, fdp)) {
if ((found == 0) && ((lmp = load_path(lml, lmco, fdp->fd_nname,
clmp, mode, flags, hdl, fdp, rej)) != 0))
found++;
/*
* Remove the used file descriptor and any objects remaining.
*/
remove_fdesc(fdp);
}
free(fdalp);
return (lmp);
}