From: Alexey Dobriyan <adobriyan@gmail.com>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: viro@zeniv.linux.org.uk, davem@davemloft.net,
ebiederm@xmission.com, akpm@linux-foundation.org,
christian.brauner@ubuntu.com, areber@redhat.com,
serge@hallyn.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 11/23] fs: Add /proc/namespaces/ directory
Date: Thu, 30 Jul 2020 15:18:34 +0300
Message-ID: <20200730121834.GA4490@localhost.localdomain> (raw)
In-Reply-To: <159611041929.535980.14513096920129728440.stgit@localhost.localdomain>
On Thu, Jul 30, 2020 at 03:00:19PM +0300, Kirill Tkhai wrote:
> # ls /proc/namespaces/ -l
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'cgroup:[4026531835]' -> 'cgroup:[4026531835]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'ipc:[4026531839]' -> 'ipc:[4026531839]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'mnt:[4026531840]' -> 'mnt:[4026531840]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'mnt:[4026531861]' -> 'mnt:[4026531861]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'mnt:[4026532133]' -> 'mnt:[4026532133]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'mnt:[4026532134]' -> 'mnt:[4026532134]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'mnt:[4026532135]' -> 'mnt:[4026532135]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'mnt:[4026532136]' -> 'mnt:[4026532136]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'net:[4026531993]' -> 'net:[4026531993]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'pid:[4026531836]' -> 'pid:[4026531836]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'time:[4026531834]' -> 'time:[4026531834]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'user:[4026531837]' -> 'user:[4026531837]'
> lrwxrwxrwx 1 root root 0 Jul 29 16:50 'uts:[4026531838]' -> 'uts:[4026531838]'
I'd say make it '%s-%llu'. The brackets don't carry any information.
And ':' forces quoting with recent coreutils.
> +static int parse_namespace_dentry_name(const struct dentry *dentry,
> + const char **type, unsigned int *type_len, unsigned int *inum)
> +{
> + const char *p, *name;
> + int count;
> +
> + *type = name = dentry->d_name.name;
> + p = strchr(name, ':');
> + *type_len = p - name;
> + if (!p || p == name)
> + return -ENOENT;
> +
> + p += 1;
> + if (sscanf(p, "[%u]%n", inum, &count) != 1 || *(p + count) != '\0' ||
> + *inum < PROC_NS_MIN_INO)
> + return -ENOENT;
sscanf is banned from lookup code due to lax whitespace rules.
See
commit ac7f1061c2c11bb8936b1b6a94cdb48de732f7a4
proc: fix /proc/*/map_files lookup
Of course someone sneaked in 1 instance, yikes.
$ grep -e scanf -n -r fs/proc/
fs/proc/base.c:1596: err = sscanf(pos, "%9s %lld %lu", clock,
> +static int proc_namespaces_readdir(struct file *file, struct dir_context *ctx)
> + len = snprintf(name, sizeof(name), "%s:[%u]", ns->ops->name, inum);
[] -- no need.
next prev parent reply other threads:[~2020-07-30 12:18 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 11:59 [PATCH 00/23] proc: Introduce /proc/namespaces/ directory to expose namespaces lineary Kirill Tkhai
2020-07-30 11:59 ` [PATCH 01/23] ns: Add common refcount into ns_common add use it as counter for net_ns Kirill Tkhai
2020-07-30 13:35 ` Christian Brauner
2020-07-30 14:07 ` Kirill Tkhai
2020-07-30 15:59 ` Christian Brauner
2020-07-30 14:30 ` Christian Brauner
2020-07-30 14:34 ` Kirill Tkhai
2020-07-30 14:39 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 02/23] uts: Use generic ns_common::count Kirill Tkhai
2020-07-30 14:30 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 03/23] ipc: " Kirill Tkhai
2020-07-30 14:32 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 04/23] pid: " Kirill Tkhai
2020-07-30 14:37 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 05/23] user: " Kirill Tkhai
2020-07-30 14:46 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 06/23] mnt: " Kirill Tkhai
2020-07-30 14:49 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 07/23] cgroup: " Kirill Tkhai
2020-07-30 14:50 ` Christian Brauner
2020-07-30 12:00 ` [PATCH 08/23] time: " Kirill Tkhai
2020-07-30 14:52 ` Christian Brauner
2020-07-30 12:00 ` [PATCH 09/23] ns: Introduce ns_idr to be able to iterate all allocated namespaces in the system Kirill Tkhai
2020-07-30 12:23 ` Matthew Wilcox
2020-07-30 13:32 ` Kirill Tkhai
2020-07-30 13:56 ` Matthew Wilcox
2020-07-30 14:12 ` Kirill Tkhai
2020-07-30 14:15 ` Matthew Wilcox
2020-07-30 14:20 ` Kirill Tkhai
2020-07-30 12:00 ` [PATCH 10/23] fs: Rename fs/proc/namespaces.c into fs/proc/task_namespaces.c Kirill Tkhai
2020-07-30 12:00 ` [PATCH 11/23] fs: Add /proc/namespaces/ directory Kirill Tkhai
2020-07-30 12:18 ` Alexey Dobriyan [this message]
2020-07-30 13:22 ` Kirill Tkhai
2020-07-30 13:26 ` Christian Brauner
2020-07-30 14:30 ` Kirill Tkhai
2020-07-30 20:47 ` kernel test robot
2020-07-30 22:20 ` kernel test robot
2020-08-05 8:17 ` kernel test robot
2020-08-05 8:17 ` [RFC PATCH] fs: namespaces_dentry_operations can be static kernel test robot
2020-07-30 12:00 ` [PATCH 12/23] user: Free user_ns one RCU grace period after final counter put Kirill Tkhai
2020-07-30 12:00 ` [PATCH 13/23] user: Add user namespaces into ns_idr Kirill Tkhai
2020-07-30 12:00 ` [PATCH 14/23] net: Add net " Kirill Tkhai
2020-07-30 12:00 ` [PATCH 15/23] pid: Eextract child_reaper check from pidns_for_children_get() Kirill Tkhai
2020-07-30 12:00 ` [PATCH 16/23] proc_ns_operations: Add can_get method Kirill Tkhai
2020-07-30 12:00 ` [PATCH 17/23] pid: Add pid namespaces into ns_idr Kirill Tkhai
2020-07-30 12:00 ` [PATCH 18/23] uts: Free uts namespace one RCU grace period after final counter put Kirill Tkhai
2020-07-30 12:01 ` [PATCH 19/23] uts: Add uts namespaces into ns_idr Kirill Tkhai
2020-07-30 12:01 ` [PATCH 20/23] ipc: Add ipc " Kirill Tkhai
2020-07-30 12:01 ` [PATCH 21/23] mnt: Add mount " Kirill Tkhai
2020-07-30 12:01 ` [PATCH 22/23] cgroup: Add cgroup " Kirill Tkhai
2020-07-30 12:01 ` [PATCH 23/23] time: Add time " Kirill Tkhai
2020-07-30 13:08 ` [PATCH 00/23] proc: Introduce /proc/namespaces/ directory to expose namespaces lineary Christian Brauner
2020-07-30 13:38 ` Christian Brauner
2020-07-30 14:34 ` Eric W. Biederman
2020-07-30 14:42 ` Christian Brauner
2020-07-30 15:01 ` Kirill Tkhai
2020-07-30 22:13 ` Eric W. Biederman
2020-07-31 8:48 ` Pavel Tikhomirov
2020-08-03 10:03 ` Kirill Tkhai
2020-08-03 10:51 ` Alexey Dobriyan
2020-08-06 8:05 ` Andrei Vagin
2020-08-07 8:47 ` Kirill Tkhai
2020-08-10 17:34 ` Andrei Vagin
2020-08-11 10:23 ` Kirill Tkhai
2020-08-12 17:53 ` Andrei Vagin
2020-08-13 8:12 ` Kirill Tkhai
2020-08-14 1:16 ` Andrei Vagin
2020-08-14 15:11 ` Kirill Tkhai
2020-08-14 19:21 ` Andrei Vagin
2020-08-17 14:05 ` Kirill Tkhai
2020-08-17 15:48 ` Eric W. Biederman
2020-08-17 17:47 ` Christian Brauner
2020-08-17 18:53 ` Eric W. Biederman
2020-08-04 5:43 ` Andrei Vagin
2020-08-04 12:11 ` Pavel Tikhomirov
2020-08-04 14:47 ` Kirill Tkhai
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