Messages in this thread |  | | Date | Sun, 21 Jan 2024 16:34:58 +0800 | | Subject | Re: [Linux Kernel Bug] UBSAN: array-index-out-of-bounds in rds_cmsg_recv | | From | Zhu Yanjun <> |
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在 2024/1/19 22:29, Chenyuan Yang 写道: > 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.
I recommend to use the latest rds to make tests. The rds in linux kernel upstream is too old. The rds in oracle linux is newer.
Zhu Yanjun
> > 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
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