From: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
To: santosh.shilimkar@oracle.com, davem@davemloft.net, kuba@kernel.org
Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
rds-devel@oss.oracle.com, linux-kernel@vger.kernel.org,
syzbot+1bd2b07f93745fa38425@syzkaller.appspotmail.com
Subject: [PATCH] net/rds: restrict iovecs length for RDS_CMSG_RDMA_ARGS
Date: Tue, 2 Feb 2021 02:32:33 +0600 [thread overview]
Message-ID: <20210201203233.1324704-1-snovitoll@gmail.com> (raw)
syzbot found WARNING in rds_rdma_extra_size [1] when RDS_CMSG_RDMA_ARGS
control message is passed with user-controlled
0x40001 bytes of args->nr_local, causing order >= MAX_ORDER condition.
The exact value 0x40001 can be checked with UIO_MAXIOV which is 0x400.
So for kcalloc() 0x400 iovecs with sizeof(struct rds_iovec) = 0x10
is the closest limit, with 0x10 leftover.
Same condition is currently done in rds_cmsg_rdma_args().
[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_array include/linux/slab.h:592 [inline]
kcalloc include/linux/slab.h:621 [inline]
rds_rdma_extra_size+0xb2/0x3b0 net/rds/rdma.c:568
rds_rm_size net/rds/send.c:928 [inline]
Reported-by: syzbot+1bd2b07f93745fa38425@syzkaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
---
net/rds/rdma.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 1d0afb1dd77b..6f1a50d50d06 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -565,6 +565,9 @@ int rds_rdma_extra_size(struct rds_rdma_args *args,
if (args->nr_local == 0)
return -EINVAL;
+ if (args->nr_local > UIO_MAXIOV)
+ return -EMSGSIZE;
+
iov->iov = kcalloc(args->nr_local,
sizeof(struct rds_iovec),
GFP_KERNEL);
--
2.25.1
next reply other threads:[~2021-02-01 20:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 20:32 Sabyrzhan Tasbolatov [this message]
2021-02-01 20:40 ` [PATCH] net/rds: restrict iovecs length for RDS_CMSG_RDMA_ARGS Santosh Shilimkar
2021-02-02 16:50 ` patchwork-bot+netdevbpf
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