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authorDavid Howells <dhowells@redhat.com>2023-05-26 14:34:54 +0300
committerPaolo Abeni <pabeni@redhat.com>2023-05-30 11:01:06 +0300
commit020c69c1a793ed29d28793808eddd75210c858dd (patch)
tree8e4499c758f061207c072036b9a61abaca810362 /net/rxrpc/ar-internal.h
parent34dfde4ad87b84d21278a7e19d92b5b2c68e6c4d (diff)
downloadlinux-020c69c1a793ed29d28793808eddd75210c858dd.tar.xz
rxrpc: Truncate UTS_RELEASE for rxrpc version
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@amd.com> Link: https://lore.kernel.org/r/20230523223944.691076-1-Kenny.Ho@amd.com/ Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Kenny Ho <Kenny.Ho@amd.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: Andrew Lunn <andrew@lunn.ch> cc: David Laight <David.Laight@ACULAB.COM> cc: "David S. Miller" <davem@davemloft.net> cc: Eric Dumazet <edumazet@google.com> cc: Jakub Kicinski <kuba@kernel.org> cc: Paolo Abeni <pabeni@redhat.com> cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org Link: https://web.mit.edu/kolya/afs/rx/rx-spec [1] Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: Jeffrey Altman <jaltman@auristor.com> Link: https://lore.kernel.org/r/654974.1685100894@warthog.procyon.org.uk Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/rxrpc/ar-internal.h')
-rw-r--r--net/rxrpc/ar-internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 5d44dc08f66d..e8e14c6f904d 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -1068,6 +1068,7 @@ int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
/*
* local_event.c
*/
+void rxrpc_gen_version_string(void);
void rxrpc_send_version_request(struct rxrpc_local *local,
struct rxrpc_host_header *hdr,
struct sk_buff *skb);