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Date: Tue, 21 May 2024 16:22:21 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>, linux-kernel@vger.kernel.org,
	linux-trace-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	linux-man@vger.kernel.org, x86@kernel.org, bpf@vger.kernel.org,
	Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Borislav Petkov (AMD)" <bp@alien8.de>,
	Ingo Molnar <mingo@redhat.com>, Andy Lutomirski <luto@kernel.org>,
	"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
	Deepak Gupta <debug@rivosinc.com>
Subject: Re: [PATCHv6 bpf-next 1/9] x86/shstk: Make return uprobe work with
 shadow stack
Message-ID: <20240521142221.GA19434@redhat.com>
References: <20240521104825.1060966-1-jolsa@kernel.org>
 <20240521104825.1060966-2-jolsa@kernel.org>
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User-Agent: Mutt/1.5.24 (2015-08-30)

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@redhat.com>


> Fixes: 8b1c23543436 ("x86/shstk: Add return uprobe support")

Hmm... Was this commit ever applied?

Oleg.