Thanks, Hraban. Appreciate the help. We will have a look at this soon.
Regards,
Tejas.
----- Original Message -----
From: "Hraban Luyat" <hraban@xxxxxxxx>
To: gluster-devel@xxxxxxxxxx
Sent: Sunday, December 20, 2009 2:47:25 AM GMT +05:30 Chennai, Kolkata, Mumbai, New Delhi
Subject: [PATCH BUG:397] More robust dictionary (un)serialization (fixes bug #397).
Hello,
This patch fixes bug 397: dictionary (de)serialization used pointer
casting which forced word-alignment on (at least) armv5tel, causing
corruption while writing and reading buffers into memory. It also adds
some debugging (more information in case of errors).
I tried to send this a few times already but I think it got bounced from
the list.
Greetings,
Hraban Luyat
Signed-off-by: Hraban Luyat <hraban@xxxxxxxx>
---
libglusterfs/src/dict.c | 41 +++++++++++++++++++++++++++++------------
1 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/libglusterfs/src/dict.c b/libglusterfs/src/dict.c
index e1c89a5..b8728ac 100644
--- a/libglusterfs/src/dict.c
+++ b/libglusterfs/src/dict.c
@@ -2195,11 +2195,12 @@ out:
int
_dict_serialize (dict_t *this, char *buf)
{
- int ret = -1;
- data_pair_t * pair = NULL;
- int32_t count = 0;
- int32_t keylen = 0;
- int32_t vallen = 0;
+ int ret = -1;
+ data_pair_t * pair = NULL;
+ int32_t count = 0;
+ int32_t keylen = 0;
+ int32_t vallen = 0;
+ int32_t netword = 0;
if (!buf) {
gf_log ("dict", GF_LOG_ERROR,
@@ -2213,7 +2214,8 @@ _dict_serialize (dict_t *this, char *buf)
goto out;
}
- *(int32_t *) buf = hton32 (count);
+ netword = hton32 (count);
+ memcpy (buf, &netword, sizeof(netword));
buf += DICT_HDR_LEN;
pair = this->members_list;
@@ -2231,7 +2233,8 @@ _dict_serialize (dict_t *this, char *buf)
}
keylen = strlen (pair->key);
- *(int32_t *) buf = hton32 (keylen);
+ netword = hton32 (keylen);
+ memcpy (buf, &netword, sizeof(netword));
buf += DICT_DATA_HDR_KEY_LEN;
if (!pair->value) {
@@ -2241,7 +2244,8 @@ _dict_serialize (dict_t *this, char *buf)
}
vallen = pair->value->len;
- *(int32_t *) buf = hton32 (vallen);
+ netword = hton32 (vallen);
+ memcpy (buf, &netword, sizeof(netword));
buf += DICT_DATA_HDR_VAL_LEN;
memcpy (buf, pair->key, keylen);
@@ -2354,7 +2358,7 @@ dict_unserialize (char *orig_buf, int32_t size, dict_t **fill)
char * key = NULL;
int32_t keylen = 0;
int32_t vallen = 0;
-
+ int32_t hostord = 0;
buf = orig_buf;
@@ -2388,7 +2392,8 @@ dict_unserialize (char *orig_buf, int32_t size, dict_t **fill)
goto out;
}
- count = ntoh32 (*(int32_t *) buf);
+ memcpy (&hostord, buf, sizeof(hostord));
+ count = ntoh32 (hostord);
buf += DICT_HDR_LEN;
if (count < 0) {
@@ -2402,22 +2407,32 @@ dict_unserialize (char *orig_buf, int32_t size, dict_t **fill)
for (i = 0; i < count; i++) {
if ((buf + DICT_DATA_HDR_KEY_LEN) > (orig_buf + size)) {
+ gf_log ("dict", GF_LOG_DEBUG,
+ "No room for keylen (size %d).",
+ DICT_DATA_HDR_KEY_LEN);
gf_log ("dict", GF_LOG_ERROR,
"undersized buffer passsed");
goto out;
}
- keylen = ntoh32 (*(int32_t *) buf);
+ memcpy (&hostord, buf, sizeof(hostord));
+ keylen = ntoh32 (hostord);
buf += DICT_DATA_HDR_KEY_LEN;
if ((buf + DICT_DATA_HDR_VAL_LEN) > (orig_buf + size)) {
+ gf_log ("dict", GF_LOG_DEBUG,
+ "No room for vallen (size %d).",
+ DICT_DATA_HDR_VAL_LEN);
gf_log ("dict", GF_LOG_ERROR,
"undersized buffer passsed");
goto out;
}
- vallen = ntoh32 (*(int32_t *) buf);
+ memcpy (&hostord, buf, sizeof(hostord));
+ vallen = ntoh32 (hostord);
buf += DICT_DATA_HDR_VAL_LEN;
if ((buf + keylen) > (orig_buf + size)) {
+ gf_log ("dict", GF_LOG_DEBUG,
+ "No room for key (size %d).", keylen);
gf_log ("dict", GF_LOG_ERROR,
"undersized buffer passsed");
goto out;
@@ -2426,6 +2441,8 @@ dict_unserialize (char *orig_buf, int32_t size, dict_t **fill)
buf += keylen + 1; /* for '\0' */
if ((buf + vallen) > (orig_buf + size)) {
+ gf_log ("dict", GF_LOG_DEBUG,
+ "No room for value (size %d).", vallen);
gf_log ("dict", GF_LOG_ERROR,
"undersized buffer passsed");
goto out;
--
1.6.5
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