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b=RVdZvFd7/PpZR32+eZg7X1QRZ7g/q6oTQ6OEknlAyPszGrI+fv6bFpSXAyKc2n4zO 8n9dU5jrjDG9xlXBZuisTlYA/57Bbcu5eQoFDFyO84sITO/5CnXX6WWdnkBEMZx74e IPRAGMZQ92UbIT3O+wG+rhkYCWoziPX2apKLB+P5U7QySKxwSQEcHkhUlLzvczlE+K Mhf+JUQdE+YYzI9grPKcdqxagMueig5tF5FxMnRN5hD9J9bNu+kbuVchQ2qFpvmZtz 1bkwmpwcbXXW2P5N2ghxQg5qv3iFPV+bRYp8oq8CNgm2PNxz5+6mp64P0ehGIFm3hn 0SXBRAqR82yCA== Date: Sat, 3 Oct 2026 10:18:34 +0100 From: "Lorenzo Stoakes (ARM)" To: Sasha Levin Cc: rppt@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, david@kernel.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev, stable@vger.kernel.org, 4ncienth@gmail.com, alexander.motin@truenas.com, caleb.stjohn@truenas.com, ameer.hamza@truenas.com Subject: Re: [REGRESSION] secretmem: SIGBUS on memfd_secret() pages while perf record runs Message-ID: References: <20261002175651.811343-1-ameer.hamza@truenas.com> <2026-10-02-rc-reply-0003-re-secretmem-sigbus-perf@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2026-10-02-rc-reply-0003-re-secretmem-sigbus-perf@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 13B891C0002 X-Stat-Signature: mj89xa95dje7zyjszi8z78hi78p7gjjz X-HE-Tag: 1791019121-734115 X-HE-Meta: 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 7z32splL +vAF83WC+cajEEsR0Z/jq9GAER0UY2a4gDVWf86cEJlxIINJpi/TIoSXVPQcAa5HPQdJz1A+fGHazmT+nhZ5Mh8EtND+QB/DDmRWjxJiY+Zbj/cL5c/T9M38Zz9b1FCT5NOTqLz2Ip7em4rKDmffcQGt4vhaM8Ho2bHxjRyLXas6AD2Rt59VTj5ae5zhSSBdLti3BLezr+Z2/HdrH2EBal+2P0z6P9cWmAdhs/eNvASB/d8H8BAKKNFN5haKTHhb2BS/h8S02wkNqI7Z5NgCbhWLN7enGqljNzflKJ2WANGVSi3k= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Oct 02, 2026 at 09:30:23PM -0400, Sasha Levin wrote: > > Since commit 97d34aa65c29 ("mm/secretmem: properly account locked > > pages"), in v7.3-rc2 and the 6.18.52 and 7.2.5 backports, touching a > > memfd_secret() page for the first time fails with SIGBUS while the > > same user is running perf record, and read() into such a page fails > > Thanks for the report. I've dropped 97d34aa65c29 from the 6.12 queue, > and also removed the copies that were staged for 6.6 and 6.1. > > 7.2.y and 6.18.y already shipped it, so those need an upstream fix, > which stable will pick up once it lands. Sasha, Could we perhaps take a breath and pause? This patch fixes a really quite serious vulnerability that allows an unprivileged process to allocate arbitrary, unreclaimable (i.e. OOMK cannot save you) memory. Allow me to assess the validity of this report _before_ dropping things from queues perhaps? :) It was sent late on Friday in a week that I was ill and it's Saturday pre-LPC, so that's hardly a timeframe that I could reasonably have replied. Thanks! -- Cheers, Lorenzo