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: <20250219152237.GB5948@redhat.com>
Date: Wed, 19 Feb 2025 16:22:38 +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 02/18, Tong Tiangen wrote:
>
> OK, Before your rewrite last merged, How about i change the solution to
> just reject them immediately after get_user_page_vma_remote()？

I agree, uprobe_write_opcode() should simply fail if is_zero_page(old_page).

Oleg.