linux-kernel - Re: [PATCHv6 bpf-next 1/9] x86/shstk: Make return uprobe work with shadow stack

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Message-ID: <ZkzRtTI72YPAMhIp@krava>
Date: Tue, 21 May 2024 18:54:13 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-man@...r.kernel.org, x86@...nel.org, bpf@...r.kernel.org,
	Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>,
	"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>
Subject: Re: [PATCHv6 bpf-next 1/9] x86/shstk: Make return uprobe work with
 shadow stack

On Tue, May 21, 2024 at 04:22:21PM +0200, Oleg Nesterov wrote:
> On 05/21, Jiri Olsa wrote:
> >
> > Currently the application with enabled shadow stack will crash
> > if it sets up return uprobe. The reason is the uretprobe kernel
> > code changes the user space task's stack, but does not update
> > shadow stack accordingly.
> >
> > Adding new functions to update values on shadow stack and using
> > them in uprobe code to keep shadow stack in sync with uretprobe
> > changes to user stack.
> 
> I don't think my ack has any value in this area but looks good to me.
> 
> Reviewed-by: Oleg Nesterov <oleg@...hat.com>
> 
> 
> > Fixes: 8b1c23543436 ("x86/shstk: Add return uprobe support")
> 
> Hmm... Was this commit ever applied?

should have been:
  488af8ea7131 x86/shstk: Wire in shadow stack interface

will send new version

thanks,
jirka

> 
> Oleg.
>