From: Tomas Bortoli <tomasbortoli@gmail.com>
To: vyasevich@gmail.com, nhorman@tuxdriver.com, marcelo.leitner@gmail.com
Cc: davem@davemloft.net, linux-sctp@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Tomas Bortoli <tomasbortoli@gmail.com>
Subject: [PATCH v2] sctp: socket.c validate sprstat_policy
Date: Sat, 27 Oct 2018 20:53:20 +0000 [thread overview]
Message-ID: <20181027205320.14975-1-tomasbortoli@gmail.com> (raw)
It is possible to perform out-of-bound reads on
sctp_getsockopt_pr_streamstatus() and on
sctp_getsockopt_pr_assocstatus() by passing from userspace a
sprstat_policy that overflows the abandoned_sent/abandoned_unsent
fixed length arrays. The over-read data are directly copied/leaked
to userspace.
Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com>
Reported-by: syzbot+5da0d0a72a9e7d791748@syzkaller.appspotmail.com
---
net/sctp/socket.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fc0386e8ff23..14dce5d95817 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -7083,7 +7083,9 @@ static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
}
policy = params.sprstat_policy;
- if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)))
+ if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
+ __SCTP_PR_INDEX(policy) > SCTP_PR_INDEX(MAX) ||
+ __SCTP_PR_INDEX(policy) < 0)
goto out;
asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
@@ -7142,7 +7144,9 @@ static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
}
policy = params.sprstat_policy;
- if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)))
+ if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
+ __SCTP_PR_INDEX(policy) > SCTP_PR_INDEX(MAX) ||
+ __SCTP_PR_INDEX(policy) < 0)
goto out;
asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
--
2.11.0
next reply other threads:[~2018-10-27 20:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-27 20:53 Tomas Bortoli [this message]
2018-10-28 4:17 ` [PATCH v2] sctp: socket.c validate sprstat_policy Xin Long
2018-10-28 8:42 ` Tomas Bortoli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181027205320.14975-1-tomasbortoli@gmail.com \
--to=tomasbortoli@gmail.com \
--cc=davem@davemloft.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sctp@vger.kernel.org \
--cc=marcelo.leitner@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=nhorman@tuxdriver.com \
--cc=vyasevich@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).