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[PATCH] WE-22 : prevent information leak on 64 bit
Johannes Berg discovered that kernel space was leaking to userspace on 64 bit platform. He made a first patch to fix that. This is an improved version of his patch. Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jean Tourrilhes
John W. Linville
parent
ed4bb10631
commit
c2805fbb86
@ -1,10 +1,10 @@
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/*
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* This file define a set of standard wireless extensions
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*
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* Version : 21 14.3.06
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* Version : 22 16.3.07
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*
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* Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
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* Copyright (c) 1997-2006 Jean Tourrilhes, All Rights Reserved.
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* Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
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*/
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#ifndef _LINUX_WIRELESS_H
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@ -85,7 +85,7 @@
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* (there is some stuff that will be added in the future...)
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* I just plan to increment with each new version.
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*/
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#define WIRELESS_EXT 21
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#define WIRELESS_EXT 22
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/*
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* Changes :
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@ -221,6 +221,10 @@
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* - Add IW_RETRY_SHORT/IW_RETRY_LONG retry modifiers
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* - Power/Retry relative values no longer * 100000
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* - Add explicit flag to tell stats are in 802.11k RCPI : IW_QUAL_RCPI
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*
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* V21 to V22
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* ----------
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* - Prevent leaking of kernel space in stream on 64 bits.
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*/
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/**************************** CONSTANTS ****************************/
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@ -1085,4 +1089,15 @@ struct iw_event
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#define IW_EV_POINT_LEN (IW_EV_LCP_LEN + sizeof(struct iw_point) - \
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IW_EV_POINT_OFF)
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/* Size of the Event prefix when packed in stream */
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#define IW_EV_LCP_PK_LEN (4)
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/* Size of the various events when packed in stream */
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#define IW_EV_CHAR_PK_LEN (IW_EV_LCP_PK_LEN + IFNAMSIZ)
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#define IW_EV_UINT_PK_LEN (IW_EV_LCP_PK_LEN + sizeof(__u32))
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#define IW_EV_FREQ_PK_LEN (IW_EV_LCP_PK_LEN + sizeof(struct iw_freq))
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#define IW_EV_PARAM_PK_LEN (IW_EV_LCP_PK_LEN + sizeof(struct iw_param))
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#define IW_EV_ADDR_PK_LEN (IW_EV_LCP_PK_LEN + sizeof(struct sockaddr))
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#define IW_EV_QUAL_PK_LEN (IW_EV_LCP_PK_LEN + sizeof(struct iw_quality))
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#define IW_EV_POINT_PK_LEN (IW_EV_LCP_LEN + 4)
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#endif /* _LINUX_WIRELESS_H */
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@ -1,10 +1,10 @@
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/*
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* This file define the new driver API for Wireless Extensions
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*
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* Version : 7 18.3.05
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* Version : 8 16.3.07
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*
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* Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
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* Copyright (c) 2001-2006 Jean Tourrilhes, All Rights Reserved.
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* Copyright (c) 2001-2007 Jean Tourrilhes, All Rights Reserved.
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*/
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#ifndef _IW_HANDLER_H
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@ -207,7 +207,7 @@
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* will be needed...
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* I just plan to increment with each new version.
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*/
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#define IW_HANDLER_VERSION 7
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#define IW_HANDLER_VERSION 8
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/*
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* Changes :
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@ -239,6 +239,10 @@
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* - Remove (struct iw_point *)->pointer from events and streams
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* - Remove spy_offset from struct iw_handler_def
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* - Add "check" version of event macros for ieee802.11 stack
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*
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* V7 to V8
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* ----------
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* - Prevent leaking of kernel space in stream on 64 bits.
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*/
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/**************************** CONSTANTS ****************************/
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@ -500,7 +504,11 @@ iwe_stream_add_event(char * stream, /* Stream of events */
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/* Check if it's possible */
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if(likely((stream + event_len) < ends)) {
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iwe->len = event_len;
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memcpy(stream, (char *) iwe, event_len);
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/* Beware of alignement issues on 64 bits */
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memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
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memcpy(stream + IW_EV_LCP_LEN,
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((char *) iwe) + IW_EV_LCP_LEN,
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event_len - IW_EV_LCP_LEN);
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stream += event_len;
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}
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return stream;
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@ -521,10 +529,10 @@ iwe_stream_add_point(char * stream, /* Stream of events */
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/* Check if it's possible */
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if(likely((stream + event_len) < ends)) {
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iwe->len = event_len;
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memcpy(stream, (char *) iwe, IW_EV_LCP_LEN);
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memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
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memcpy(stream + IW_EV_LCP_LEN,
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((char *) iwe) + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
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IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
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memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length);
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stream += event_len;
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}
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@ -574,7 +582,11 @@ iwe_stream_check_add_event(char * stream, /* Stream of events */
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/* Check if it's possible, set error if not */
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if(likely((stream + event_len) < ends)) {
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iwe->len = event_len;
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memcpy(stream, (char *) iwe, event_len);
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/* Beware of alignement issues on 64 bits */
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memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
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memcpy(stream + IW_EV_LCP_LEN,
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((char *) iwe) + IW_EV_LCP_LEN,
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event_len - IW_EV_LCP_LEN);
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stream += event_len;
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} else
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*perr = -E2BIG;
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@ -598,10 +610,10 @@ iwe_stream_check_add_point(char * stream, /* Stream of events */
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/* Check if it's possible */
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if(likely((stream + event_len) < ends)) {
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iwe->len = event_len;
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memcpy(stream, (char *) iwe, IW_EV_LCP_LEN);
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memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
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memcpy(stream + IW_EV_LCP_LEN,
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((char *) iwe) + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
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IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
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memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length);
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stream += event_len;
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} else
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@ -621,7 +621,8 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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if (err < 0)
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goto errout;
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iw += IW_EV_POINT_OFF;
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/* Payload is at an offset in buffer */
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iw = iw_buf + IW_EV_POINT_OFF;
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}
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#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
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@ -2,7 +2,7 @@
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* This file implement the Wireless Extensions APIs.
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*
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* Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
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* Copyright (c) 1997-2006 Jean Tourrilhes, All Rights Reserved.
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* Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
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*
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* (As all part of the Linux kernel, this file is GPL)
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*/
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@ -76,6 +76,9 @@
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* o Change length in ESSID and NICK to strlen() instead of strlen()+1
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* o Make standard_ioctl_num and standard_event_num unsigned
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* o Remove (struct net_device *)->get_wireless_stats()
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*
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* v10 - 16.3.07 - Jean II
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* o Prevent leaking of kernel space in stream on 64 bits.
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*/
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/***************************** INCLUDES *****************************/
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@ -427,6 +430,21 @@ static const int event_type_size[] = {
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IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
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};
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/* Size (in bytes) of various events, as packed */
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static const int event_type_pk_size[] = {
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IW_EV_LCP_PK_LEN, /* IW_HEADER_TYPE_NULL */
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0,
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IW_EV_CHAR_PK_LEN, /* IW_HEADER_TYPE_CHAR */
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0,
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IW_EV_UINT_PK_LEN, /* IW_HEADER_TYPE_UINT */
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IW_EV_FREQ_PK_LEN, /* IW_HEADER_TYPE_FREQ */
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IW_EV_ADDR_PK_LEN, /* IW_HEADER_TYPE_ADDR */
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0,
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IW_EV_POINT_PK_LEN, /* Without variable payload */
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IW_EV_PARAM_PK_LEN, /* IW_HEADER_TYPE_PARAM */
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IW_EV_QUAL_PK_LEN, /* IW_HEADER_TYPE_QUAL */
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};
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/************************ COMMON SUBROUTINES ************************/
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/*
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* Stuff that may be used in various place or doesn't fit in one
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@ -1217,7 +1235,7 @@ static int rtnetlink_standard_get(struct net_device * dev,
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memcpy(buffer + IW_EV_POINT_OFF, request, request_len);
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/* Use our own copy of wrqu */
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wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF
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+ IW_EV_LCP_LEN);
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+ IW_EV_LCP_PK_LEN);
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/* No extra arguments. Trivial to handle */
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ret = handler(dev, &info, wrqu, NULL);
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@ -1229,8 +1247,8 @@ static int rtnetlink_standard_get(struct net_device * dev,
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/* Get a temp copy of wrqu (skip pointer) */
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memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
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((char *) request) + IW_EV_LCP_LEN,
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IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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((char *) request) + IW_EV_LCP_PK_LEN,
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IW_EV_POINT_LEN - IW_EV_LCP_PK_LEN);
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/* Calculate space needed by arguments. Always allocate
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* for max space. Easier, and won't last long... */
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@ -1240,7 +1258,7 @@ static int rtnetlink_standard_get(struct net_device * dev,
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(wrqu_point.data.length > descr->max_tokens))
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extra_size = (wrqu_point.data.length
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* descr->token_size);
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buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF;
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buffer_size = extra_size + IW_EV_POINT_PK_LEN + IW_EV_POINT_OFF;
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#ifdef WE_RTNETLINK_DEBUG
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printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n",
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dev->name, extra_size, buffer_size);
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@ -1254,15 +1272,15 @@ static int rtnetlink_standard_get(struct net_device * dev,
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/* Put wrqu in the right place (just before extra).
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* Leave space for IWE header and dummy pointer...
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* Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned...
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* Note that IW_EV_LCP_PK_LEN==4 bytes, so it's still aligned.
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*/
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memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
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memcpy(buffer + IW_EV_LCP_PK_LEN + IW_EV_POINT_OFF,
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((char *) &wrqu_point) + IW_EV_POINT_OFF,
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IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN);
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IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
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wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_PK_LEN);
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/* Extra comes logically after that. Offset +12 bytes. */
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extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN;
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extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_PK_LEN;
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/* Call the handler */
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ret = handler(dev, &info, wrqu, extra);
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@ -1270,11 +1288,11 @@ static int rtnetlink_standard_get(struct net_device * dev,
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/* Calculate real returned length */
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extra_size = (wrqu->data.length * descr->token_size);
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/* Re-adjust reply size */
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request->len = extra_size + IW_EV_POINT_LEN;
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request->len = extra_size + IW_EV_POINT_PK_LEN;
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/* Put the iwe header where it should, i.e. scrap the
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* dummy pointer. */
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memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN);
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memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_PK_LEN);
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#ifdef WE_RTNETLINK_DEBUG
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printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size);
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@ -1331,10 +1349,10 @@ static inline int rtnetlink_standard_set(struct net_device * dev,
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#endif /* WE_RTNETLINK_DEBUG */
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/* Extract fixed header from request. This is properly aligned. */
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wrqu = &request->u;
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wrqu = (union iwreq_data *) (((char *) request) + IW_EV_LCP_PK_LEN);
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/* Check if wrqu is complete */
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hdr_len = event_type_size[descr->header_type];
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hdr_len = event_type_pk_size[descr->header_type];
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if(request_len < hdr_len) {
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#ifdef WE_RTNETLINK_DEBUG
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printk(KERN_DEBUG
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@ -1359,7 +1377,7 @@ static inline int rtnetlink_standard_set(struct net_device * dev,
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/* Put wrqu in the right place (skip pointer) */
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memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
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wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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wrqu, IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
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/* Don't forget about the event code... */
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wrqu = &wrqu_point;
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@ -1483,7 +1501,7 @@ static inline int rtnetlink_private_get(struct net_device * dev,
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hdr_len = extra_size;
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extra_size = 0;
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} else {
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hdr_len = IW_EV_POINT_LEN;
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hdr_len = IW_EV_POINT_PK_LEN;
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}
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/* Check if wrqu is complete */
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@ -1514,7 +1532,7 @@ static inline int rtnetlink_private_get(struct net_device * dev,
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memcpy(buffer + IW_EV_POINT_OFF, request, request_len);
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/* Use our own copy of wrqu */
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wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF
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+ IW_EV_LCP_LEN);
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+ IW_EV_LCP_PK_LEN);
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/* No extra arguments. Trivial to handle */
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ret = handler(dev, &info, wrqu, (char *) wrqu);
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@ -1523,7 +1541,7 @@ static inline int rtnetlink_private_get(struct net_device * dev,
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char * extra;
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/* Buffer for full reply */
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buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF;
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buffer_size = extra_size + IW_EV_POINT_PK_LEN + IW_EV_POINT_OFF;
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#ifdef WE_RTNETLINK_DEBUG
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printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n",
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@ -1538,15 +1556,15 @@ static inline int rtnetlink_private_get(struct net_device * dev,
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/* Put wrqu in the right place (just before extra).
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* Leave space for IWE header and dummy pointer...
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* Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned...
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* Note that IW_EV_LCP_PK_LEN==4 bytes, so it's still aligned.
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*/
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memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
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((char *) request) + IW_EV_LCP_LEN,
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IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN);
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memcpy(buffer + IW_EV_LCP_PK_LEN + IW_EV_POINT_OFF,
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((char *) request) + IW_EV_LCP_PK_LEN,
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IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
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wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_PK_LEN);
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/* Extra comes logically after that. Offset +12 bytes. */
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extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN;
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extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_PK_LEN;
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/* Call the handler */
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ret = handler(dev, &info, wrqu, extra);
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@ -1556,11 +1574,11 @@ static inline int rtnetlink_private_get(struct net_device * dev,
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if (!(descr->get_args & IW_PRIV_SIZE_FIXED))
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extra_size = adjust_priv_size(descr->get_args, wrqu);
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/* Re-adjust reply size */
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request->len = extra_size + IW_EV_POINT_LEN;
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request->len = extra_size + IW_EV_POINT_PK_LEN;
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/* Put the iwe header where it should, i.e. scrap the
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* dummy pointer. */
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memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN);
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memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_PK_LEN);
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#ifdef WE_RTNETLINK_DEBUG
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printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size);
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@ -1641,14 +1659,14 @@ static inline int rtnetlink_private_set(struct net_device * dev,
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/* Does it fits in wrqu ? */
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if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
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(extra_size <= IFNAMSIZ)) {
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hdr_len = IW_EV_LCP_LEN + extra_size;
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hdr_len = IW_EV_LCP_PK_LEN + extra_size;
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extra_size = 0;
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} else {
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hdr_len = IW_EV_POINT_LEN;
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hdr_len = IW_EV_POINT_PK_LEN;
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}
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/* Extract fixed header from request. This is properly aligned. */
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wrqu = &request->u;
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wrqu = (union iwreq_data *) (((char *) request) + IW_EV_LCP_PK_LEN);
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/* Check if wrqu is complete */
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if(request_len < hdr_len) {
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@ -1675,7 +1693,7 @@ static inline int rtnetlink_private_set(struct net_device * dev,
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/* Put wrqu in the right place (skip pointer) */
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memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
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wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN);
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wrqu, IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
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/* Does it fits within bounds ? */
|
||||
if(wrqu_point.data.length > (descr->set_args &
|
||||
@ -1738,7 +1756,7 @@ int wireless_rtnetlink_get(struct net_device * dev,
|
||||
iw_handler handler;
|
||||
|
||||
/* Check length */
|
||||
if(len < IW_EV_LCP_LEN) {
|
||||
if(len < IW_EV_LCP_PK_LEN) {
|
||||
printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n",
|
||||
dev->name, len);
|
||||
return -EINVAL;
|
||||
@ -1822,7 +1840,7 @@ int wireless_rtnetlink_set(struct net_device * dev,
|
||||
iw_handler handler;
|
||||
|
||||
/* Check length */
|
||||
if(len < IW_EV_LCP_LEN) {
|
||||
if(len < IW_EV_LCP_PK_LEN) {
|
||||
printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n",
|
||||
dev->name, len);
|
||||
return -EINVAL;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user