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Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Anderson Nascimento , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, Jeffrey Altman , stable@kernel.org Subject: [PATCH net v2 2/6] rxrpc: Fix rxkad crypto unalignment handling Date: Wed, 22 Apr 2026 17:14:31 +0100 Message-ID: <20260422161438.2593376-3-dhowells@redhat.com> In-Reply-To: <20260422161438.2593376-1-dhowells@redhat.com> References: <20260422161438.2593376-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Fix handling of a packet with a misaligned crypto length. Also handle non-ENOMEM errors from decryption by aborting. Further, remove the WARN_ON_ONCE() so that it can't be remotely triggered (a trace line can still be emitted). Fixes: f93af41b9f5f ("rxrpc: Fix missing error checks for rxkad encryption/decryption failure") Closes: https://sashiko.dev/#/patchset/20260408121252.2249051-1-dhowells%40redhat.com Signed-off-by: David Howells cc: Marc Dionne cc: Jeffrey Altman cc: Eric Dumazet cc: "David S. Miller" cc: Jakub Kicinski cc: Paolo Abeni cc: Simon Horman cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org cc: stable@kernel.org --- include/trace/events/rxrpc.h | 1 + net/rxrpc/rxkad.c | 9 +++++++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index 578b8038b211..5820d7e41ea0 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -37,6 +37,7 @@ EM(rxkad_abort_1_short_encdata, "rxkad1-short-encdata") \ EM(rxkad_abort_1_short_header, "rxkad1-short-hdr") \ EM(rxkad_abort_2_short_check, "rxkad2-short-check") \ + EM(rxkad_abort_2_crypto_unaligned, "rxkad2-crypto-unaligned") \ EM(rxkad_abort_2_short_data, "rxkad2-short-data") \ EM(rxkad_abort_2_short_header, "rxkad2-short-hdr") \ EM(rxkad_abort_2_short_len, "rxkad2-short-len") \ diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c index 5a720222854f..cba7935977f0 100644 --- a/net/rxrpc/rxkad.c +++ b/net/rxrpc/rxkad.c @@ -510,6 +510,9 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb, return rxrpc_abort_eproto(call, skb, RXKADSEALEDINCON, rxkad_abort_2_short_header); + /* Don't let the crypto algo see a misaligned length. */ + sp->len = round_down(sp->len, 8); + /* Decrypt the skbuff in-place. TODO: We really want to decrypt * directly into the target buffer. */ @@ -543,8 +546,10 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb, if (sg != _sg) kfree(sg); if (ret < 0) { - WARN_ON_ONCE(ret != -ENOMEM); - return ret; + if (ret == -ENOMEM) + return ret; + return rxrpc_abort_eproto(call, skb, RXKADSEALEDINCON, + rxkad_abort_2_crypto_unaligned); } /* Extract the decrypted packet length */