From: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
To: davem@davemloft.net, kuba@kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
syzbot+c2a7e5c5211605a90865@syzkaller.appspotmail.com
Subject: [PATCH] net/qrtr: restrict user-controlled length in qrtr_tun_write_iter()
Date: Tue, 2 Feb 2021 15:20:59 +0600 [thread overview]
Message-ID: <20210202092059.1361381-1-snovitoll@gmail.com> (raw)
syzbot found WARNING in qrtr_tun_write_iter [1] when write_iter length
exceeds KMALLOC_MAX_SIZE causing order >= MAX_ORDER condition.
Additionally, there is no check for 0 length write.
[1]
WARNING: mm/page_alloc.c:5011
[..]
Call Trace:
alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2267
alloc_pages include/linux/gfp.h:547 [inline]
kmalloc_order+0x2e/0xb0 mm/slab_common.c:837
kmalloc_order_trace+0x14/0x120 mm/slab_common.c:853
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:682 [inline]
qrtr_tun_write_iter+0x8a/0x180 net/qrtr/tun.c:83
call_write_iter include/linux/fs.h:1901 [inline]
Reported-by: syzbot+c2a7e5c5211605a90865@syzkaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
---
net/qrtr/tun.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/qrtr/tun.c b/net/qrtr/tun.c
index 15ce9b642b25..b238c40a9984 100644
--- a/net/qrtr/tun.c
+++ b/net/qrtr/tun.c
@@ -80,6 +80,12 @@ static ssize_t qrtr_tun_write_iter(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret;
void *kbuf;
+ if (!len)
+ return -EINVAL;
+
+ if (len > KMALLOC_MAX_SIZE)
+ return -ENOMEM;
+
kbuf = kzalloc(len, GFP_KERNEL);
if (!kbuf)
return -ENOMEM;
--
2.25.1
next reply other threads:[~2021-02-02 9:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-02 9:20 Sabyrzhan Tasbolatov [this message]
2021-02-04 0:28 ` [PATCH] net/qrtr: restrict user-controlled length in qrtr_tun_write_iter() Jakub Kicinski
2021-02-04 9:02 ` [PATCH] net/qrtr: replaced useless kzalloc with kmalloc " Sabyrzhan Tasbolatov
2021-02-04 18:51 ` Jakub Kicinski
2021-02-04 18:53 ` Jakub Kicinski
2021-02-04 0:40 ` [PATCH] net/qrtr: restrict user-controlled length " patchwork-bot+netdevbpf
2021-02-12 11:51 ` Eric Dumazet
2021-02-21 12:39 ` [PATCH] net/qrtr: restrict " Sabyrzhan Tasbolatov
2021-02-22 8:45 ` Eric Dumazet
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=20210202092059.1361381-1-snovitoll@gmail.com \
--to=snovitoll@gmail.com \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=syzbot+c2a7e5c5211605a90865@syzkaller.appspotmail.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.