From: ebiederm@xmission.com (Eric W. Biederman) To: Linus Torvalds <torvalds@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk>, LKML <linux-kernel@vger.kernel.org>, Kernel Hardening <kernel-hardening@lists.openwall.com>, Linux API <linux-api@vger.kernel.org>, Linux FS Devel <linux-fsdevel@vger.kernel.org>, Linux Security Module <linux-security-module@vger.kernel.org>, Akinobu Mita <akinobu.mita@gmail.com>, Alexey Dobriyan <adobriyan@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Andy Lutomirski <luto@kernel.org>, Daniel Micay <danielmicay@gmail.com>, Djalal Harouni <tixxdz@gmail.com>, "Dmitry V . Levin" <ldv@altlinux.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Ingo Molnar <mingo@kernel.org>, "J . Bruce Fields" <bfields@fieldses.org>, Jeff Layton <jlayton@poochiereds.net>, Jonathan Corbet <corbet@lwn.net>, Kees Cook <keescook@chromium.org>, Oleg Nesterov <oleg@redhat.com>, Solar Designer <solar@openwall.com>, Alexey Gladkov <gladkov.alexey@gmail.com> Subject: [PATCH v2 0/6] proc: Dentry flushing without proc_mnt Date: Mon, 24 Feb 2020 10:25:16 -0600 Message-ID: <871rqk2brn.fsf_-_@x220.int.ebiederm.org> (raw) In-Reply-To: <871rqpaswu.fsf_-_@x220.int.ebiederm.org> (Eric W. Biederman's message of "Thu, 20 Feb 2020 14:46:25 -0600") I have addressed all of the review comments as I understand them, and fixed the small oversight the kernel test robot was able to find. (I had failed to initialize the new field pid->inodes). I did not hear any concerns from the 10,000 foot level last time so I am assuming this set of changes (baring bugs) is good to go. Unless some new issues appear my plan is to put this in my tree and get this into linux-next. Which will give Alexey something to build his changes on. I tested this set of changes by running: (while ls -1 -f /proc > /dev/null ; do :; done ) & And monitoring the amount of free memory. With the flushing disabled I saw the used memory in the system grow by 20M before the shrinker would bring it back down to where it started. With the patch applied I saw the memory usage stay essentially fixed. So flushing definitely keeps things working better. If anyone sees any problems with this code please let me know. Thank you, Eric W. Biederman (6): proc: Rename in proc_inode rename sysctl_inodes sibling_inodes proc: Generalize proc_sys_prune_dcache into proc_prune_siblings_dcache proc: In proc_prune_siblings_dcache cache an aquired super block proc: Use d_invalidate in proc_prune_siblings_dcache proc: Clear the pieces of proc_inode that proc_evict_inode cares about proc: Use a list of inodes to flush from proc fs/proc/base.c | 111 ++++++++++++++++-------------------------------- fs/proc/inode.c | 73 ++++++++++++++++++++++++++++--- fs/proc/internal.h | 4 +- fs/proc/proc_sysctl.c | 45 +++----------------- include/linux/pid.h | 1 + include/linux/proc_fs.h | 4 +- kernel/exit.c | 4 +- kernel/pid.c | 1 + 8 files changed, 120 insertions(+), 123 deletions(-)
next prev parent reply index Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-10 15:05 [PATCH v8 00/11] proc: modernize proc to support multiple private instances Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 01/11] proc: Rename struct proc_fs_info to proc_fs_opts Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 02/11] proc: add proc_fs_info struct to store proc information Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 03/11] proc: move /proc/{self|thread-self} dentries to proc_fs_info Alexey Gladkov 2020-02-10 18:23 ` Andy Lutomirski 2020-02-12 15:00 ` Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 04/11] proc: move hide_pid, pid_gid from pid_namespace " Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 05/11] proc: add helpers to set and get proc hidepid and gid mount options Alexey Gladkov 2020-02-10 18:30 ` Andy Lutomirski 2020-02-12 14:57 ` Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 06/11] proc: support mounting procfs instances inside same pid namespace Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 07/11] proc: flush task dcache entries from all procfs instances Alexey Gladkov 2020-02-10 17:46 ` Linus Torvalds 2020-02-10 19:23 ` Al Viro 2020-02-11 1:36 ` Eric W. Biederman 2020-02-11 4:01 ` Eric W. Biederman 2020-02-12 14:49 ` Alexey Gladkov 2020-02-12 14:59 ` Eric W. Biederman 2020-02-12 17:08 ` Alexey Gladkov 2020-02-12 18:45 ` Linus Torvalds 2020-02-12 19:16 ` Eric W. Biederman 2020-02-12 19:49 ` Linus Torvalds 2020-02-12 20:03 ` Al Viro 2020-02-12 20:35 ` Linus Torvalds 2020-02-12 20:38 ` Al Viro 2020-02-12 20:41 ` Al Viro 2020-02-12 21:02 ` Linus Torvalds 2020-02-12 21:46 ` Eric W. Biederman 2020-02-13 0:48 ` Linus Torvalds 2020-02-13 4:37 ` Eric W. Biederman 2020-02-13 5:55 ` Al Viro 2020-02-13 21:30 ` Linus Torvalds 2020-02-13 22:23 ` Al Viro 2020-02-13 22:47 ` Linus Torvalds 2020-02-14 14:15 ` Eric W. Biederman 2020-02-14 3:48 ` Eric W. Biederman 2020-02-20 20:46 ` [PATCH 0/7] proc: Dentry flushing without proc_mnt Eric W. Biederman 2020-02-20 20:47 ` [PATCH 1/7] proc: Rename in proc_inode rename sysctl_inodes sibling_inodes Eric W. Biederman 2020-02-20 20:48 ` [PATCH 2/7] proc: Generalize proc_sys_prune_dcache into proc_prune_siblings_dcache Eric W. Biederman 2020-02-20 20:49 ` [PATCH 3/7] proc: Mov rcu_read_(lock|unlock) in proc_prune_siblings_dcache Eric W. Biederman 2020-02-20 22:33 ` Linus Torvalds 2020-02-20 20:49 ` [PATCH 4/7] proc: Use d_invalidate " Eric W. Biederman 2020-02-20 22:43 ` Linus Torvalds 2020-02-20 22:54 ` Al Viro 2020-02-20 23:00 ` Linus Torvalds 2020-02-20 23:03 ` Al Viro 2020-02-20 23:39 ` Eric W. Biederman 2020-02-20 20:51 ` [PATCH 5/7] proc: Clear the pieces of proc_inode that proc_evict_inode cares about Eric W. Biederman 2020-02-20 20:52 ` [PATCH 6/7] proc: Use a list of inodes to flush from proc Eric W. Biederman 2020-02-20 20:52 ` [PATCH 7/7] proc: Ensure we see the exit of each process tid exactly once Eric W. Biederman 2020-02-21 16:50 ` Oleg Nesterov 2020-02-22 15:46 ` Eric W. Biederman 2020-02-20 23:02 ` [PATCH 0/7] proc: Dentry flushing without proc_mnt Linus Torvalds 2020-02-20 23:07 ` Al Viro 2020-02-20 23:37 ` Eric W. Biederman 2020-02-24 16:25 ` Eric W. Biederman [this message] 2020-02-24 16:26 ` [PATCH v2 1/6] proc: Rename in proc_inode rename sysctl_inodes sibling_inodes Eric W. Biederman 2020-02-24 16:27 ` [PATCH v2 2/6] proc: Generalize proc_sys_prune_dcache into proc_prune_siblings_dcache Eric W. Biederman 2020-02-24 16:27 ` [PATCH v2 3/6] proc: In proc_prune_siblings_dcache cache an aquired super block Eric W. Biederman 2020-02-24 16:28 ` [PATCH v2 4/6] proc: Use d_invalidate in proc_prune_siblings_dcache Eric W. Biederman 2020-02-24 16:28 ` [PATCH v2 5/6] proc: Clear the pieces of proc_inode that proc_evict_inode cares about Eric W. Biederman 2020-02-24 16:29 ` [PATCH v2 6/6] proc: Use a list of inodes to flush from proc Eric W. Biederman 2020-02-28 20:17 ` [PATCH 0/3] proc: Actually honor the mount options Eric W. Biederman 2020-02-28 20:18 ` [PATCH 1/3] uml: Don't consult current to find the proc_mnt in mconsole_proc Eric W. Biederman 2020-02-28 20:18 ` [PATCH 2/3] uml: Create a private mount of proc for mconsole Eric W. Biederman 2020-02-28 20:30 ` Christian Brauner 2020-02-28 21:28 ` Eric W. Biederman 2020-02-28 21:59 ` Christian Brauner 2020-02-28 20:19 ` [PATCH 3/3] proc: Remove the now unnecessary internal mount of proc Eric W. Biederman 2020-02-28 20:39 ` Christian Brauner 2020-02-28 21:40 ` Eric W. Biederman 2020-02-28 22:34 ` [PATCH 4/3] pid: Improve the comment about waiting in zap_pid_ns_processes Eric W. Biederman 2020-02-29 2:59 ` Christian Brauner 2020-02-14 3:49 ` [PATCH v8 07/11] proc: flush task dcache entries from all procfs instances Eric W. Biederman 2020-02-12 19:47 ` Al Viro 2020-02-11 22:45 ` Al Viro 2020-02-12 14:26 ` Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 08/11] proc: instantiate only pids that we can ptrace on 'hidepid=4' mount option Alexey Gladkov 2020-02-10 16:29 ` Jordan Glover 2020-02-12 14:34 ` Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 09/11] proc: add option to mount only a pids subset Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 10/11] docs: proc: add documentation for "hidepid=4" and "subset=pidfs" options and new mount behavior Alexey Gladkov 2020-02-10 18:29 ` Andy Lutomirski 2020-02-12 16:03 ` Alexey Gladkov 2020-02-10 15:05 ` [PATCH v8 11/11] proc: Move hidepid values to uapi as they are user interface to mount Alexey Gladkov
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