Fix sctp privilege elevation (CVE-2006-3745)

sctp_make_abort_user() now takes the msg_len along with the msg
so that we don't have to recalculate the bytes in iovec.
It also uses memcpy_fromiovec() so that we don't go beyond the
length allocated.

It is good to have this fix even if verify_iovec() is fixed to
return error on overflow.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sridhar Samudrala
2006-08-22 11:50:39 -07:00
committed by Greg Kroah-Hartman
parent ac185bdc02
commit c164a9ba0a
5 changed files with 23 additions and 53 deletions

View File

@ -404,19 +404,6 @@ static inline int sctp_list_single_entry(struct list_head *head)
return ((head->next != head) && (head->next == head->prev));
}
/* Calculate the size (in bytes) occupied by the data of an iovec. */
static inline size_t get_user_iov_size(struct iovec *iov, int iovlen)
{
size_t retval = 0;
for (; iovlen > 0; --iovlen) {
retval += iov->iov_len;
iov++;
}
return retval;
}
/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
static inline __s32 sctp_jitter(__u32 rto)
{