linux-kernel - Re: Add Morton,Peter and David for discussion//Re: [PATCH -next] uprobes: fix two zero old_folio bugs in __replace

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Message-ID: <20250220122525.GA30669@redhat.com>
Date: Thu, 20 Feb 2025 13:25:26 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Tong Tiangen <tongtiangen@...wei.com>
Cc: David Hildenbrand <david@...hat.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, bpf@...r.kernel.org,
	wangkefeng.wang@...wei.com, linux-mm <linux-mm@...ck.org>
Subject: Re: Add Morton,Peter and David for discussion//Re: [PATCH -next]
 uprobes: fix two zero old_folio bugs in __replace_page()

On 02/20, Tong Tiangen wrote:
>
> 在 2025/2/20 16:38, David Hildenbrand 写道:
> >On 20.02.25 03:31, Tong Tiangen wrote:
> >>
> >>@@ -506,6 +506,12 @@ int uprobe_write_opcode(struct arch_uprobe
> >>*auprobe, struct mm_struct *mm,
> >>          if (ret <= 0)
> >>                  goto put_old;
> >>
> >>+       if (WARN(is_zero_page(old_page),
> >
> >This can likely be triggered by user space, so do not use WARN.
>
> OK,thanks.
>
> Hi Oleg, is that all right?

Thanks, LGTM.

Oleg.