mirror of
https://github.com/sheumann/hush.git
synced 2024-08-04 20:29:02 +00:00
61b038accc
Hey guys. I've found a bug in modprobe where it generates bad strings and makes sytem calls with them. The following patch seems to have fixed the problem. It is rather inherited elsewhere, as there seems to be incorrect entries in the list which results in more dependencies than really exist for a given call to mod_process. But, this patch prevents the bad text from going to the screen. You will notice there are cases where lcmd goes unmodified before calling system. Please consider the following patch. Thanks. -Steve
597 lines
13 KiB
C
597 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Modprobe written from scratch for BusyBox
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*
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* Copyright (c) 2002 by Robert Griebl, griebl@gmx.de
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* Copyright (c) 2003 by Andrew Dennison, andrew.dennison@motec.com.au
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sys/utsname.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <string.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include "busybox.h"
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struct dep_t {
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char * m_module;
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char * m_options;
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int m_isalias : 1;
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int m_reserved : 15;
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int m_depcnt : 16;
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char ** m_deparr;
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struct dep_t * m_next;
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};
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struct mod_list_t {
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char * m_module;
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char * m_options;
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struct mod_list_t * m_prev;
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struct mod_list_t * m_next;
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};
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static struct dep_t *depend;
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static int autoclean, show_only, quiet, do_syslog, verbose;
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int parse_tag_value ( char *buffer, char **ptag, char **pvalue )
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{
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char *tag, *value;
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while ( isspace ( *buffer ))
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buffer++;
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tag = value = buffer;
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while ( !isspace ( *value ))
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value++;
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*value++ = 0;
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while ( isspace ( *value ))
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value++;
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*ptag = tag;
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*pvalue = value;
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return bb_strlen( tag ) && bb_strlen( value );
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}
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/* Jump through hoops to simulate how fgets() grabs just one line at a
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* time... Don't use any stdio since modprobe gets called from a kernel
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* thread and stdio junk can overflow the limited stack...
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*/
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static char *reads ( int fd, char *buffer, size_t len )
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{
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int n = read ( fd, buffer, len );
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if ( n > 0 ) {
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char *p;
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buffer [len-1] = 0;
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p = strchr ( buffer, '\n' );
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if ( p ) {
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off_t offset;
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offset = lseek ( fd, 0L, SEEK_CUR ); // Get the current file descriptor offset
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lseek ( fd, offset-n + (p-buffer) + 1, SEEK_SET ); // Set the file descriptor offset to right after the \n
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p[1] = 0;
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}
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return buffer;
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}
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else
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return 0;
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}
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static struct dep_t *build_dep ( void )
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{
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int fd;
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struct utsname un;
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struct dep_t *first = 0;
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struct dep_t *current = 0;
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char buffer[256];
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char *filename = buffer;
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int continuation_line = 0;
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if ( uname ( &un ))
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return 0;
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// check for buffer overflow in following code
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if ( bb_strlen ( un.release ) > ( sizeof( buffer ) - 64 )) {
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return 0;
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}
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strcpy ( filename, "/lib/modules/" );
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strcat ( filename, un.release );
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strcat ( filename, "/modules.dep" );
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if (( fd = open ( filename, O_RDONLY )) < 0 ) {
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/* Ok, that didn't work. Fall back to looking in /lib/modules */
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if (( fd = open ( "/lib/modules/modules.dep", O_RDONLY )) < 0 ) {
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return 0;
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}
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}
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while ( reads ( fd, buffer, sizeof( buffer ))) {
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int l = bb_strlen ( buffer );
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char *p = 0;
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while ( isspace ( buffer [l-1] )) {
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buffer [l-1] = 0;
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l--;
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}
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if ( l == 0 ) {
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continuation_line = 0;
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continue;
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}
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if ( !continuation_line ) {
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char *col = strchr ( buffer, ':' );
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if ( col ) {
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char *mods;
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char *mod;
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int ext = 0;
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*col = 0;
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mods = strrchr ( buffer, '/' );
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if ( !mods )
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mods = buffer;
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else
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mods++;
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if (( *(col-2) == '.' ) && ( *(col-1) == 'o' ))
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ext = 2;
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mod = bb_xstrndup ( mods, col - mods - ext );
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if ( !current ) {
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first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
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}
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else {
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current-> m_next = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
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current = current-> m_next;
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}
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current-> m_module = mod;
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current-> m_options = 0;
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current-> m_isalias = 0;
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current-> m_depcnt = 0;
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current-> m_deparr = 0;
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current-> m_next = 0;
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//printf ( "%s:\n", mod );
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p = col + 1;
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}
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else
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p = 0;
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}
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else
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p = buffer;
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if ( p && *p ) {
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char *end = &buffer [l-1];
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char *deps = strrchr ( end, '/' );
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char *dep;
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int ext = 0;
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while ( isblank ( *end ) || ( *end == '\\' ))
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end--;
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deps = strrchr ( p, '/' );
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if ( !deps || ( deps < p )) {
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deps = p;
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while ( isblank ( *deps ))
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deps++;
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}
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else
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deps++;
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if (( *(end-1) == '.' ) && ( *end == 'o' ))
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ext = 2;
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/* Cope with blank lines */
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if ((end-deps-ext+1) <= 0)
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continue;
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dep = bb_xstrndup ( deps, end - deps - ext + 1 );
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current-> m_depcnt++;
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current-> m_deparr = (char **) xrealloc ( current-> m_deparr, sizeof ( char *) * current-> m_depcnt );
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current-> m_deparr [current-> m_depcnt - 1] = dep;
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//printf ( " %d) %s\n", current-> m_depcnt, current-> m_deparr [current-> m_depcnt -1] );
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}
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if ( buffer [l-1] == '\\' )
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continuation_line = 1;
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else
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continuation_line = 0;
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}
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close ( fd );
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// alias parsing is not 100% correct (no correct handling of continuation lines within an alias) !
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if (( fd = open ( "/etc/modules.conf", O_RDONLY )) < 0 )
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if (( fd = open ( "/etc/conf.modules", O_RDONLY )) < 0 )
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return first;
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continuation_line = 0;
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while ( reads ( fd, buffer, sizeof( buffer ))) {
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int l;
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char *p;
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p = strchr ( buffer, '#' );
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if ( p )
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*p = 0;
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l = bb_strlen ( buffer );
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while ( l && isspace ( buffer [l-1] )) {
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buffer [l-1] = 0;
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l--;
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}
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if ( l == 0 ) {
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continuation_line = 0;
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continue;
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}
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if ( !continuation_line ) {
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if (( strncmp ( buffer, "alias", 5 ) == 0 ) && isspace ( buffer [5] )) {
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char *alias, *mod;
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if ( parse_tag_value ( buffer + 6, &alias, &mod )) {
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// fprintf ( stderr, "ALIAS: '%s' -> '%s'\n", alias, mod );
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if ( !current ) {
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first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
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}
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else {
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current-> m_next = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
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current = current-> m_next;
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}
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current-> m_module = bb_xstrdup ( alias );
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current-> m_isalias = 1;
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if (( strcmp ( alias, "off" ) == 0 ) || ( strcmp ( alias, "null" ) == 0 )) {
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current-> m_depcnt = 0;
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current-> m_deparr = 0;
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}
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else {
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current-> m_depcnt = 1;
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current-> m_deparr = xmalloc ( 1 * sizeof( char * ));
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current-> m_deparr[0] = bb_xstrdup ( mod );
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}
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current-> m_next = 0;
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}
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}
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else if (( strncmp ( buffer, "options", 7 ) == 0 ) && isspace ( buffer [7] )) {
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char *mod, *opt;
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if ( parse_tag_value ( buffer + 8, &mod, &opt )) {
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struct dep_t *dt;
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for ( dt = first; dt; dt = dt-> m_next ) {
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if ( strcmp ( dt-> m_module, mod ) == 0 )
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break;
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}
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if ( dt ) {
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dt-> m_options = xrealloc ( dt-> m_options, bb_strlen( opt ) + 1 );
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strcpy ( dt-> m_options, opt );
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// fprintf ( stderr, "OPTION: '%s' -> '%s'\n", dt-> m_module, dt-> m_options );
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}
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}
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}
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}
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}
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close ( fd );
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return first;
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}
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/* return 1 = loaded, 0 = not loaded, -1 = can't tell */
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static int already_loaded (const char *name)
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{
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int fd;
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char buffer[256];
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fd = open ("/proc/modules", O_RDONLY);
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if (fd < 0)
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return -1;
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while ( reads ( fd, buffer, sizeof( buffer ))) {
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char *p;
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p = strchr (buffer, ' ');
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if (p) {
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*p = 0;
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if (strcmp (name, buffer) == 0) {
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close (fd);
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return 1;
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}
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}
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}
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close (fd);
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return 0;
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}
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static int mod_process ( struct mod_list_t *list, int do_insert )
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{
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char lcmd [256];
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int rc = 1;
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while ( list ) {
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*lcmd = '\0';
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if ( do_insert ) {
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if (already_loaded (list->m_module) != 1)
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snprintf ( lcmd, sizeof( lcmd ) - 1, "insmod %s %s %s %s %s", do_syslog ? "-s" : "", autoclean ? "-k" : "", quiet ? "-q" : "", list-> m_module, list-> m_options ? list-> m_options : "" );
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} else {
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if (already_loaded (list->m_module) != 0)
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snprintf ( lcmd, sizeof( lcmd ) - 1, "rmmod %s %s", do_syslog ? "-s" : "", list-> m_module );
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}
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if ( verbose )
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printf ( "%s\n", lcmd );
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if ( !show_only && *lcmd) {
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int rc2 = system ( lcmd );
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if (do_insert) rc = rc2; /* only last module matters */
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else if (!rc2) rc = 0; /* success if remove any mod */
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}
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list = do_insert ? list-> m_prev : list-> m_next;
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}
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return (show_only) ? 0 : rc;
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}
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static void check_dep ( char *mod, struct mod_list_t **head, struct mod_list_t **tail )
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{
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struct mod_list_t *find;
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struct dep_t *dt;
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char *opt = 0;
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int lm;
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// remove .o extension
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lm = bb_strlen ( mod );
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if (( mod [lm-2] == '.' ) && ( mod [lm-1] == 'o' ))
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mod [lm-2] = 0;
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// check dependencies
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for ( dt = depend; dt; dt = dt-> m_next ) {
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if ( strcmp ( dt-> m_module, mod ) == 0 ) {
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opt = dt-> m_options;
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break;
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}
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}
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// resolve alias names
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while ( dt && dt-> m_isalias ) {
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if ( dt-> m_depcnt == 1 ) {
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struct dep_t *adt;
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for ( adt = depend; adt; adt = adt-> m_next ) {
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if ( strcmp ( adt-> m_module, dt-> m_deparr [0] ) == 0 )
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break;
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}
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if ( adt ) {
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dt = adt;
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mod = dt-> m_module;
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if ( !opt )
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opt = dt-> m_options;
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}
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else
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return;
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}
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else
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return;
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}
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// search for duplicates
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for ( find = *head; find; find = find-> m_next ) {
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if ( !strcmp ( mod, find-> m_module )) {
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// found -> dequeue it
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if ( find-> m_prev )
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find-> m_prev-> m_next = find-> m_next;
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else
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*head = find-> m_next;
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if ( find-> m_next )
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find-> m_next-> m_prev = find-> m_prev;
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else
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*tail = find-> m_prev;
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break; // there can be only one duplicate
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}
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}
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if ( !find ) { // did not find a duplicate
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find = (struct mod_list_t *) xmalloc ( sizeof(struct mod_list_t));
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find-> m_module = mod;
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find-> m_options = opt;
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}
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// enqueue at tail
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if ( *tail )
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(*tail)-> m_next = find;
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find-> m_prev = *tail;
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find-> m_next = 0;
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if ( !*head )
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*head = find;
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*tail = find;
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if ( dt ) {
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int i;
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for ( i = 0; i < dt-> m_depcnt; i++ )
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check_dep ( dt-> m_deparr [i], head, tail );
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}
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}
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static int mod_insert ( char *mod, int argc, char **argv )
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{
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struct mod_list_t *tail = 0;
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struct mod_list_t *head = 0;
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int rc;
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// get dep list for module mod
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check_dep ( mod, &head, &tail );
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if ( head && tail ) {
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if ( argc ) {
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int i;
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int l = 0;
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// append module args
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for ( i = 0; i < argc; i++ )
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l += ( bb_strlen ( argv [i] ) + 1 );
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head-> m_options = xrealloc ( head-> m_options, l + 1 );
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head-> m_options [0] = 0;
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for ( i = 0; i < argc; i++ ) {
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strcat ( head-> m_options, argv [i] );
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strcat ( head-> m_options, " " );
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}
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}
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// process tail ---> head
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rc = mod_process ( tail, 1 );
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}
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else
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rc = 1;
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return rc;
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}
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static int mod_remove ( char *mod )
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{
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int rc;
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static struct mod_list_t rm_a_dummy = { "-a", 0, 0 };
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struct mod_list_t *head = 0;
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struct mod_list_t *tail = 0;
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if ( mod )
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check_dep ( mod, &head, &tail );
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else // autoclean
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head = tail = &rm_a_dummy;
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if ( head && tail )
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rc = mod_process ( head, 0 ); // process head ---> tail
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else
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rc = 1;
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return rc;
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}
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extern int modprobe_main(int argc, char** argv)
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{
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int opt;
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int remove_opt = 0;
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autoclean = show_only = quiet = do_syslog = verbose = 0;
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while ((opt = getopt(argc, argv, "acdklnqrst:vVC:")) != -1) {
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switch(opt) {
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case 'c': // no config used
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case 'l': // no pattern matching
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return EXIT_SUCCESS;
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break;
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case 'C': // no config used
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case 't': // no pattern matching
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bb_error_msg_and_die("-t and -C not supported");
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case 'a': // ignore
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case 'd': // ignore
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break;
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case 'k':
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autoclean++;
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break;
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case 'n':
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show_only++;
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break;
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case 'q':
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quiet++;
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break;
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case 'r':
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remove_opt++;
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break;
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case 's':
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do_syslog++;
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break;
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case 'v':
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verbose++;
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break;
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case 'V':
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default:
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bb_show_usage();
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break;
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}
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}
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|
|
|
depend = build_dep ( );
|
|
|
|
if ( !depend )
|
|
bb_error_msg_and_die ( "could not parse modules.dep\n" );
|
|
|
|
if (remove_opt) {
|
|
int rc = EXIT_SUCCESS;
|
|
do {
|
|
if (mod_remove ( optind < argc ?
|
|
bb_xstrdup (argv [optind]) : NULL )) {
|
|
bb_error_msg ("failed to remove module %s",
|
|
argv [optind] );
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
} while ( ++optind < argc );
|
|
|
|
return rc;
|
|
}
|
|
|
|
if (optind >= argc)
|
|
bb_error_msg_and_die ( "No module or pattern provided\n" );
|
|
|
|
if ( mod_insert ( bb_xstrdup ( argv [optind] ), argc - optind - 1, argv + optind + 1 ))
|
|
bb_error_msg_and_die ( "failed to load module %s", argv [optind] );
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
|