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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-10-24 12:46:58 (GMT)
committerArnaldo Carvalho de Melo <acme@ghostprotocols.net>2007-10-24 12:46:58 (GMT)
commit76fd1e87d9456c8185b8df76ac5e533e0c8b39bb (patch)
tree2706975f5e479de467afd959d68866dd12bbb363 /net
parentd8ef2c29a0dcfccb2d90cac990143d1a4668708a (diff)
downloadlinux-76fd1e87d9456c8185b8df76ac5e533e0c8b39bb.tar.xz
[DCCP]: Unaligned pointer access
This fixes `unaligned (read) access' errors of the type Kernel unaligned access at TPC[100f970c] dccp_parse_options+0x4f4/0x7e0 [dccp] Kernel unaligned access at TPC[1011f2e4] ccid3_hc_tx_parse_options+0x1ac/0x380 [dccp_ccid3] Kernel unaligned access at TPC[100f9898] dccp_parse_options+0x680/0x880 [dccp] by using the get_unaligned macro for parsing options. Commiter note: Preserved the sparse __be{16,32} annotations. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ccids/ccid3.c11
-rw-r--r--net/dccp/options.c33
2 files changed, 29 insertions, 15 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 25772c3..05f263e 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -40,6 +40,8 @@
#include "lib/tfrc.h"
#include "ccid3.h"
+#include <asm/unaligned.h>
+
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
static int ccid3_debug;
#define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a)
@@ -544,6 +546,7 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
const struct dccp_sock *dp = dccp_sk(sk);
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
+ __be32 opt_val;
opt_recv = &hctx->ccid3hctx_options_received;
@@ -563,8 +566,8 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
dccp_role(sk), sk, len);
rc = -EINVAL;
} else {
- opt_recv->ccid3or_loss_event_rate =
- ntohl(*(__be32 *)value);
+ opt_val = get_unaligned((__be32 *)value);
+ opt_recv->ccid3or_loss_event_rate = ntohl(opt_val);
ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
dccp_role(sk), sk,
opt_recv->ccid3or_loss_event_rate);
@@ -585,8 +588,8 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
dccp_role(sk), sk, len);
rc = -EINVAL;
} else {
- opt_recv->ccid3or_receive_rate =
- ntohl(*(__be32 *)value);
+ opt_val = get_unaligned((__be32 *)value);
+ opt_recv->ccid3or_receive_rate = ntohl(opt_val);
ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
dccp_role(sk), sk,
opt_recv->ccid3or_receive_rate);
diff --git a/net/dccp/options.c b/net/dccp/options.c
index d361b55..d286cff 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -14,6 +14,7 @@
#include <linux/dccp.h>
#include <linux/module.h>
#include <linux/types.h>
+#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
@@ -59,6 +60,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
unsigned char opt, len;
unsigned char *value;
u32 elapsed_time;
+ __be32 opt_val;
int rc;
int mandatory = 0;
@@ -145,7 +147,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
if (len != 4)
goto out_invalid_option;
- opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value);
+ opt_val = get_unaligned((__be32 *)value);
+ opt_recv->dccpor_timestamp = ntohl(opt_val);
dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
dp->dccps_timestamp_time = ktime_get_real();
@@ -159,7 +162,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
if (len != 4 && len != 6 && len != 8)
goto out_invalid_option;
- opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value);
+ opt_val = get_unaligned((__be32 *)value);
+ opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
"ackno=%llu", dccp_role(sk),
@@ -168,16 +172,20 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
(unsigned long long)
DCCP_SKB_CB(skb)->dccpd_ack_seq);
+ value += 4;
- if (len == 4) {
+ if (len == 4) { /* no elapsed time included */
dccp_pr_debug_cat("\n");
break;
}
- if (len == 6)
- elapsed_time = ntohs(*(__be16 *)(value + 4));
- else
- elapsed_time = ntohl(*(__be32 *)(value + 4));
+ if (len == 6) { /* 2-byte elapsed time */
+ __be16 opt_val2 = get_unaligned((__be16 *)value);
+ elapsed_time = ntohs(opt_val2);
+ } else { /* 4-byte elapsed time */
+ opt_val = get_unaligned((__be32 *)value);
+ elapsed_time = ntohl(opt_val);
+ }
dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
@@ -192,10 +200,13 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
if (pkt_type == DCCP_PKT_DATA)
continue;
- if (len == 2)
- elapsed_time = ntohs(*(__be16 *)value);
- else
- elapsed_time = ntohl(*(__be32 *)value);
+ if (len == 2) {
+ __be16 opt_val2 = get_unaligned((__be16 *)value);
+ elapsed_time = ntohs(opt_val2);
+ } else {
+ opt_val = get_unaligned((__be32 *)value);
+ elapsed_time = ntohl(opt_val);
+ }
if (elapsed_time > opt_recv->dccpor_elapsed_time)
opt_recv->dccpor_elapsed_time = elapsed_time;