netdev - [Linux Kernel Bug] UBSAN: array-index-out-of-bounds in rds_cmsg

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Date: Fri, 19 Jan 2024 08:29:01 -0600
From: Chenyuan Yang <chenyuan0y@...il.com>
To: santosh.shilimkar@...cle.com, netdev@...r.kernel.org, 
	linux-rdma@...r.kernel.org, rds-devel@....oracle.com, 
	linux-kernel@...r.kernel.org
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	pabeni@...hat.com, "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>, 
	Zijie Zhao <zzjas98@...il.com>
Subject: [Linux Kernel Bug] UBSAN: array-index-out-of-bounds in rds_cmsg_recv

Dear Linux Kernel Developers for Network RDS,

We encountered "UBSAN: array-index-out-of-bounds in rds_cmsg_recv"
when testing the RDS with our generated specifications. The C
reproduce program and logs for this crash are attached.

This crash happens when RDS receives messages by using
`rds_cmsg_recv`, which reads the `j+1` index of the array
`inc->i_rx_lat_trace`
(https://elixir.bootlin.com/linux/v6.7/source/net/rds/recv.c#L585).
The length of `inc->i_rx_lat_trace` array is 4 (defined by
`RDS_RX_MAX_TRACES`,
https://elixir.bootlin.com/linux/v6.7/source/net/rds/rds.h#L289) while
`j` is the value stored in another array `rs->rs_rx_trace`
(https://elixir.bootlin.com/linux/v6.7/source/net/rds/recv.c#L583),
which is sent from others and could be arbitrary value.

This crash might be exploited to read the value out-of-bound from the
array by setting arbitrary values for the array `rs->rs_rx_trace`.

If you have any questions or require more information, please feel
free to contact us.

Best,
Chenyuan

Download attachment "repro.prog" of type "application/octet-stream" (925 bytes)

Download attachment "repro.report" of type "application/octet-stream" (1925 bytes)

Download attachment "repro.log" of type "application/octet-stream" (15746 bytes)

Download attachment "repro.cprog" of type "application/octet-stream" (34342 bytes)