netdev - Re: [PATCH v1 bpf-next 03/10] bpf: tcp: Get rid of st_bucket

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250521231755.91774-1-kuniyu@amazon.com>
Date: Wed, 21 May 2025 16:17:48 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <kuniyu@...zon.com>
CC: <alexei.starovoitov@...il.com>, <bpf@...r.kernel.org>,
	<daniel@...earbox.net>, <jordan@...fe.io>, <martin.lau@...ux.dev>,
	<netdev@...r.kernel.org>, <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH v1 bpf-next 03/10] bpf: tcp: Get rid of st_bucket_done

From: Kuniyuki Iwashima <kuniyu@...zon.com>
Date: Wed, 21 May 2025 15:57:59 -0700
> From: Jordan Rife <jordan@...fe.io>
> Date: Tue, 20 May 2025 07:50:50 -0700
> > Get rid of the st_bucket_done field to simplify TCP iterator state and
> > logic. Before, st_bucket_done could be false if bpf_iter_tcp_batch
> > returned a partial batch; however, with the last patch ("bpf: tcp: Make
> > sure iter->batch always contains a full bucket snapshot"),
> > st_bucket_done == true is equivalent to iter->cur_sk == iter->end_sk.
> > 
> > Signed-off-by: Jordan Rife <jordan@...fe.io>
> > ---
> >  net/ipv4/tcp_ipv4.c | 14 ++++++--------
> >  1 file changed, 6 insertions(+), 8 deletions(-)
> > 
> > diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> > index 27022018194a..20730723a02c 100644
> > --- a/net/ipv4/tcp_ipv4.c
> > +++ b/net/ipv4/tcp_ipv4.c
> > @@ -3020,7 +3020,6 @@ struct bpf_tcp_iter_state {
> >  	unsigned int end_sk;
> >  	unsigned int max_sk;
> >  	struct sock **batch;
> > -	bool st_bucket_done;
> >  };
> >  
> >  struct bpf_iter__tcp {
> > @@ -3043,8 +3042,10 @@ static int tcp_prog_seq_show(struct bpf_prog *prog, struct bpf_iter_meta *meta,
> >  
> >  static void bpf_iter_tcp_put_batch(struct bpf_tcp_iter_state *iter)
> >  {
> > -	while (iter->cur_sk < iter->end_sk)
> > -		sock_gen_put(iter->batch[iter->cur_sk++]);
> > +	unsigned int cur_sk = iter->cur_sk;
> > +
> > +	while (cur_sk < iter->end_sk)
> > +		sock_gen_put(iter->batch[cur_sk++]);
> 
> Why is this chunk included in this patch ?

This should be in patch 5 to keep cur_sk for find_cookie