linux-kernel - Re: [PATCH] SUNRPC: Fix rpcgss_context trace event acceptor field

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Date: Wed, 10 Apr 2024 13:07:20 -0400
From: Chuck Lever <chuck.lever@...cle.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Jeff Layton <jlayton@...nel.org>,
        Anna Schumaker <Anna.Schumaker@...app.com>, linux-nfs@...r.kernel.org
Subject: Re: [PATCH] SUNRPC: Fix rpcgss_context trace event acceptor field

On Wed, Apr 10, 2024 at 01:07:41PM -0400, Steven Rostedt wrote:
> On Wed, 10 Apr 2024 12:38:53 -0400
> Chuck Lever <chuck.lever@...cle.com> wrote:
> 
> > On Wed, Apr 10, 2024 at 12:38:13PM -0400, Steven Rostedt wrote:
> > > From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> > > 
> > > The rpcgss_context trace event acceptor field is a dynamically sized
> > > string that records the "data" parameter. But this parameter is also
> > > dependent on the "len" field to determine the size of the data.
> > > 
> > > It needs to use __string_len() helper macro where the length can be passed
> > > in. It also incorrectly uses strncpy() to save it instead of
> > > __assign_str(). As these macros can change, it is not wise to open code
> > > them in trace events.
> > > 
> > > As of commit c759e609030c ("tracing: Remove __assign_str_len()"),
> > > __assign_str() can be used for both __string() and __string_len() fields.
> > > Before that commit, __assign_str_len() is required to be used. This needs
> > > to be noted for backporting. (In actuality, commit c1fa617caeb0 ("tracing:
> > > Rework __assign_str() and __string() to not duplicate getting the string")
> > > is the commit that makes __string_str_len() obsolete).
> > > 
> > > Cc: stable@...r.kernel.org
> > > Fixes: 0c77668ddb4e7 ("SUNRPC: Introduce trace points in rpc_auth_gss.ko")
> > > Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>  
> > 
> > Acked-by: Chuck Lever <chuck.lever@...cle.com>
> > 
> 
> Thanks, but feel free to take it if you want. Unless you rather have me
> take it through my tree?

Well I guess I could test it for you. I'll take it for nfsd v6.9-rc.


-- 
Chuck Lever