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Thu, 20 Aug 2026 14:24:42 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id hGMNKSoOh2o2aQAAD6G6ig (envelope-from ); Thu, 20 Aug 2026 14:24:42 +0000 Date: Thu, 20 Aug 2026 16:24:43 +0200 From: Cyril Hrubis To: Andrea Cervesato Message-ID: References: <20260820-fchroot-v2-0-062ed20957a0@suse.com> <20260820-fchroot-v2-7-062ed20957a0@suse.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20260820-fchroot-v2-7-062ed20957a0@suse.com> X-Spamd-Result: default: False [-8.30 / 50.00]; REPLY(-4.00)[]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MISSING_XM_UA(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_DN_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo, yuki.lan:mid, suse.cz:email] X-Virus-Scanned: clamav-milter 1.0.9 at in-7.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH STAGING v2 07/16] fchroot04: test fchroot() into failfs as root X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Linux Test Project Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi! > +/*\ > + * Test :manpage:`fchroot(2)` with the ``FD_FAILFS_ROOT`` sentinel as a > + * privileged process. > + * > + * :manpage:`fchroot(2)` was introduced in Linux v7.3 together with failfs, > + * a kernel internal filesystem where every operation fails with > + * ``EOPNOTSUPP``. The ``FD_FAILFS_ROOT`` sentinel moves the process root > + * there without needing a file descriptor: it is the ``fs_struct`` equivalent > + * of ``RESOLVE_BENEATH``. > + * > + * The test verifies that entering failfs succeeds with ``CAP_SYS_CHROOT`` and > + * that every absolute path lookup then fails with ``EOPNOTSUPP``. The working > + * directory, left behind in the real filesystem, is consequently reported > + * as unreachable by :manpage:`getcwd(2)`. > + * > + * The syscall runs in a forked child because leaving failfs requires a > + * mount namespace file descriptor and the parent needs its root for the > + * test framework cleanup. Here as well no need for the fork(). -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp