netdev - Re: [PATCH net] rxrpc: Truncate UTS

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Date: Sat, 27 May 2023 13:59:51 +0200
From: Simon Horman <simon.horman@...igine.com>
To: David Howells <dhowells@...hat.com>
Cc: netdev@...r.kernel.org, Kenny Ho <Kenny.Ho@....com>,
	Marc Dionne <marc.dionne@...istor.com>,
	Andrew Lunn <andrew@...n.ch>,
	David Laight <David.Laight@...lab.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] rxrpc: Truncate UTS_RELEASE for rxrpc version

On Fri, May 26, 2023 at 12:34:54PM +0100, David Howells wrote:
>     
> UTS_RELEASE has a maximum length of 64 which can cause rxrpc_version to
> exceed the 65 byte message limit.
> 
> Per the rx spec[1]: "If a server receives a packet with a type value of 13,
> and the client-initiated flag set, it should respond with a 65-byte payload
> containing a string that identifies the version of AFS software it is
> running."
> 
> The current implementation causes a compile error when WERROR is turned on
> and/or UTS_RELEASE exceeds the length of 49 (making the version string more
> than 64 characters).
> 
> Fix this by generating the string during module initialisation and limiting
> the UTS_RELEASE segment of the string does not exceed 49 chars.  We need to
> make sure that the 64 bytes includes "linux-" at the front and " AF_RXRPC"
> at the back as this may be used in pattern matching.
> 
> Fixes: 44ba06987c0b ("RxRPC: Handle VERSION Rx protocol packets")
> Reported-by: Kenny Ho <Kenny.Ho@....com>
> Link: https://lore.kernel.org/r/20230523223944.691076-1-Kenny.Ho@amd.com/
> Signed-off-by: David Howells <dhowells@...hat.com>
> Acked-by: Kenny Ho <Kenny.Ho@....com>
> cc: Marc Dionne <marc.dionne@...istor.com>
> cc: Andrew Lunn <andrew@...n.ch>
> cc: David Laight <David.Laight@...LAB.COM>
> cc: "David S. Miller" <davem@...emloft.net>
> cc: Eric Dumazet <edumazet@...gle.com>
> cc: Jakub Kicinski <kuba@...nel.org>
> cc: Paolo Abeni <pabeni@...hat.com>
> cc: linux-afs@...ts.infradead.org
> cc: netdev@...r.kernel.org
> Link: https://web.mit.edu/kolya/afs/rx/rx-spec [1]

Reviewed-by: Simon Horman <simon.horman@...igine.com>