From: Paolo Abeni <pabeni@redhat.com>
To: Simon Horman <horms@kernel.org>, lucien.xin@gmail.com
Cc: steved@redhat.com, marcelo.leitner@gmail.com,
aahringo@redhat.com, alibuda@linux.alibaba.com,
jbaron@akamai.com, hare@suse.de, kuba@kernel.org, tom@talpey.com,
linux-cifs@vger.kernel.org, daniel@haxx.se, quic@lists.linux.dev,
jlayton@kernel.org, tfanelli@redhat.com, dhowells@redhat.com,
linkinjeon@kernel.org, hepengtao@xiaomi.com, pc@manguebit.com,
kernel-tls-handshake@lists.linux.dev, illiliti@protonmail.com,
xiyou.wangcong@gmail.com, andrew.gospodarek@broadcom.com,
mail@johnericson.me, edumazet@google.com, matttbe@kernel.org,
netdev@vger.kernel.org, smfrench@gmail.com, metze@samba.org,
mbuhl@openbsd.org, chuck.lever@oracle.com, dreibh@simula.no,
davem@davemloft.net, sd@queasysnail.net
Subject: Re: [net-next,v9,03/15] quic: provide common utilities and data structures
Date: Thu, 5 Feb 2026 13:51:46 +0100 [thread overview]
Message-ID: <1bcfe20e-0103-44a5-82b5-90cba7ba5a60@redhat.com> (raw)
In-Reply-To: <20260205115449.2195294-1-horms@kernel.org>
On 2/5/26 12:54 PM, Simon Horman wrote:
> This is an AI-generated review of your patch. The human sending this
> email has considered the AI review valid, or at least plausible.
>
> For local reproduction steps see https://netdev-ai.bots.linux.dev/ai-local.html
> ---
> quic: provide common utilities and data structures
>
> This patch provides foundational data structures and utilities for
> the QUIC stack, including hash tables for socket lookup, connection
> ID management, and helpers for encoding/decoding transport parameters.
>
>> diff --git a/net/quic/common.c b/net/quic/common.c
>> new file mode 100644
>> index 000000000000..94321f3f213d
>> --- /dev/null
>> +++ b/net/quic/common.c
>
> [ ... ]
>
>> +/* Reads a QUIC transport parameter value. */
>> +u8 quic_get_param(u64 *pdest, u8 **pp, u32 *plen)
>> +{
>> + u64 valuelen;
>> +
>> + if (!quic_get_var(pp, plen, &valuelen))
>> + return 0;
>> +
>> + if (*plen < valuelen)
>> + return 0;
>> +
>> + if (!quic_get_var(pp, plen, pdest))
>> + return 0;
>> +
>> + return (u8)valuelen;
>> +}
>
> Does quic_get_param() need to verify that quic_get_var() consumed exactly
> valuelen bytes?
>
> The function reads valuelen at the first quic_get_var() call, then decodes
> the value with the second quic_get_var(). However, quic_get_var() determines
> how many bytes to consume based on the varint prefix in the data, not from
> valuelen.
>
> If a malformed packet has valuelen=2 but the varint encoding requires 4 bytes,
> quic_get_var() will consume 4 bytes while the function returns valuelen=2.
> This could desynchronize parsing of subsequent parameters since the caller
> expects the buffer to have advanced by valuelen bytes based on the return
> value.
Hard to tell without any caller for this function. Possibly you could
drop it? IDK if enforcing such check would be correct/safe from an
interoperability PoV.
>> diff --git a/net/quic/common.h b/net/quic/common.h
>> new file mode 100644
>> index 000000000000..bfec0aaf2907
>> --- /dev/null
>> +++ b/net/quic/common.h
>
> [ ... ]
>
>> +#define QUIC_CONN_ID_MAX_LEN 20
>
> [ ... ]
>
>> +struct quic_conn_id {
>> + u8 data[QUIC_CONN_ID_MAX_LEN];
>> + u8 len;
>> +};
>> +
>> +static inline void quic_conn_id_update(struct quic_conn_id *conn_id, u8 *data, u32 len)
>> +{
>> + memcpy(conn_id->data, data, len);
>> + conn_id->len = (u8)len;
>> +}
>
> Should quic_conn_id_update() validate that len does not exceed
> QUIC_CONN_ID_MAX_LEN before the memcpy?
>
> The destination buffer conn_id->data is a 20-byte array, but the len
> parameter is u32 with no bounds check. If a caller passes len > 20, the
> memcpy would overflow the buffer.
It looks like the check responsibility is on the callers. I guess it
would make things more robust and simpler move the check here.
/P
next prev parent reply other threads:[~2026-02-05 12:51 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-02 14:27 [PATCH net-next v9 00/15] net: introduce QUIC infrastructure and core subcomponents Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 01/15] net: define IPPROTO_QUIC and SOL_QUIC constants Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 02/15] net: build socket infrastructure for QUIC protocol Xin Long
2026-02-05 11:54 ` [net-next,v9,02/15] " Simon Horman
2026-02-05 12:48 ` Paolo Abeni
2026-02-05 19:03 ` Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 03/15] quic: provide common utilities and data structures Xin Long
2026-02-05 11:54 ` [net-next,v9,03/15] " Simon Horman
2026-02-05 12:51 ` Paolo Abeni [this message]
2026-02-05 19:18 ` Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 04/15] quic: provide family ops for address and protocol Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 05/15] quic: provide quic.h header files for kernel and userspace Xin Long
2026-02-05 11:55 ` [net-next,v9,05/15] " Simon Horman
2026-02-05 19:37 ` Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 06/15] quic: add stream management Xin Long
2026-02-05 11:55 ` [net-next,v9,06/15] " Simon Horman
2026-02-05 18:56 ` Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 07/15] quic: add connection id management Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 08/15] quic: add path management Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 09/15] quic: add congestion control Xin Long
2026-02-05 11:55 ` [net-next,v9,09/15] " Simon Horman
2026-02-05 19:00 ` Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 10/15] quic: add packet number space Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 11/15] quic: add crypto key derivation and installation Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 12/15] quic: add crypto packet encryption and decryption Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 13/15] quic: add timer management Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 14/15] quic: add packet builder base Xin Long
2026-02-02 14:27 ` [PATCH net-next v9 15/15] quic: add packet parser base Xin Long
2026-02-05 11:55 ` [net-next,v9,15/15] " Simon Horman
2026-02-05 19:02 ` Xin Long
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