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Mon, 04 Nov 2024 16:38:48 +0000 Date: Mon, 4 Nov 2024 17:38:45 +0100 From: Petr Vorel To: Cyril Hrubis Message-ID: <20241104163845.GA1417282@pevik> References: <20240925084921.16352-1-ice_yangxiao@163.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spamd-Result: default: False [-3.50 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; HAS_REPLYTO(0.30)[pvorel@suse.cz]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; MISSING_XM_UA(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[163.com]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[163.com,lists.linux.it]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:replyto]; RCPT_COUNT_THREE(0.00)[3]; REPLYTO_EQ_FROM(0.00)[] X-Virus-Scanned: clamav-milter 1.0.3 at in-2.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH v2] syscalls/{fanotify17, getxattr05}: Fix the ENOSPC error 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: , Reply-To: Petr Vorel Cc: ltp@lists.linux.it 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 Cyril, Xiao Yang, > Hi! > > If the value of max_user_namespaces is set to 10 but more than > > 10 user namspaces are currently used on system. In this case, > > these tests fail with ENOSPC. for example: > > # lsns -t user -n | wc -l > > 17 > > # ./fanotify17 > > ... > > fanotify17.c:174: TINFO: Test #0: Global groups limit in init user ns > > fanotify17.c:130: TPASS: Created 128 groups - below groups limit (128) > > fanotify17.c:174: TINFO: Test #1: Global groups limit in privileged user ns > > fanotify17.c:154: TFAIL: unshare(CLONE_NEWUSER) failed: ENOSPC (28) > > tst_test.c:452: TBROK: Invalid child (6958) exit value 1 > That's strange the test seems to work for me even if it's over the > limit. > $ lsns -t user -n | wc -l > 14 I'm able to reproduce as well on VM. I get problems with 9 for fanotify17 ... # for i in {0..7}; do unshare -U & done # lsns -t user -n | wc -l 9 # ./fanotify17 ... fanotify17.c:154: TFAIL: unshare(CLONE_NEWUSER) failed: ENOSPC (28) tst_test.c:452: TBROK: Invalid child (1916) exit value 1 and with 10 for getxattr05: # unshare -U & # lsns -t user -n | wc -l 10 # ./getxattr05 getxattr05.c:88: TPASS: Got same data when acquiring the value of system.posix_acl_access twice getxattr05.c:88: TPASS: Got same data when acquiring the value of system.posix_acl_access twice getxattr05.c:88: TPASS: Got same data when acquiring the value of system.posix_acl_access twice > I suppose that since the test is executed as a root since it has > .require_root the limits does not apply. It's strange that they apply in > your case. Which kernel is this? Testing on 6.12.0-rc4-1.gf83465d-default and 6.11.5-1-default (both openSUSE Tumbleweed) and 6.9.9-amd64 (Debian). Yes, root access is required for rw to /proc/sys/user/max_user_namespaces: getxattr05.c:159: TBROK: Failed to open FILE '/proc/sys/user/max_user_namespaces' for writing: EACCES (13) getxattr05.c:167: TWARN: Failed to open FILE '/proc/sys/user/max_user_namespaces' for writing: EACCES (13) Kind regards, Petr -- Mailing list info: https://lists.linux.it/listinfo/ltp