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Sat, 13 Dec 2025 10:00:47 -0800 (PST) From: Dan Klishch To: legion@kernel.org Cc: containers@lists.linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk Subject: Re: [RESEND PATCH v6 0/5] proc: subset=pid: Relax check of mount visibility Date: Sat, 13 Dec 2025 13:00:38 -0500 Message-ID: <20251213180040.750109-1-danilklishch@gmail.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > It is much easier to implement file access > restrictions in procfs using an ebpf controller. But if we already have a masked /proc from podman/docker/user who decided to run `mount --bind /dev/null /proc/smth`, the sandbox will not have a choice other than to bail out. Also, correct me if I am wrong, installing ebpf controller requires CAP_BPF in initial userns, so rootless podman will not be able to mask /proc "properly" even if someone sends a patch switching it to ebpf. Thanks, Dan Klishch