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From: Christian Brauner <christian.brauner@ubuntu.com>
To: "Stéphane Graber" <stgraber@ubuntu.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Aleksa Sarai" <cyphar@cyphar.com>,
	"Jann Horn" <jannh@google.com>
Cc: smbarber@chromium.org, Seth Forshee <seth.forshee@canonical.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Serge Hallyn <serge@hallyn.com>, James Morris <jmorris@namei.org>,
	Kees Cook <keescook@chromium.org>,
	Jonathan Corbet <corbet@lwn.net>, Phil Estes <estesp@gmail.com>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	containers@lists.linux-foundation.org,
	linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
	Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH v2 05/28] proc: task_state(): use from_kfs{g,u}id_munged
Date: Fri, 14 Feb 2020 19:35:31 +0100
Message-ID: <20200214183554.1133805-6-christian.brauner@ubuntu.com> (raw)
In-Reply-To: <20200214183554.1133805-1-christian.brauner@ubuntu.com>

If fsid mappings have been written, this will cause proc to look at fsid
mappings for the user namespace. If no fsid mappings have been written the
behavior is as before.

Here is part of the output from /proc/<pid>/status from the initial user
namespace for systemd running in an unprivileged container as user namespace
root with id mapping 0 100000 100000 and fsid mapping 0 300000 100000:

Name:	systemd
Umask:	0000
State:	S (sleeping)
Tgid:	13023
Ngid:	0
Pid:	13023
PPid:	13008
TracerPid:	0
Uid:	100000	100000	100000	300000
Gid:	100000	100000	100000	300000
FDSize:	64
Groups:

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 fs/proc/array.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 5efaf3708ec6..d4a04f85a67e 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -91,6 +91,7 @@
 #include <linux/string_helpers.h>
 #include <linux/user_namespace.h>
 #include <linux/fs_struct.h>
+#include <linux/fsuidgid.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -193,11 +194,11 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 	seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
 	seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
 	seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
-	seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
+	seq_put_decimal_ull(m, "\t", from_kfsuid_munged(user_ns, cred->fsuid));
 	seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
 	seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
 	seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
-	seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
+	seq_put_decimal_ull(m, "\t", from_kfsgid_munged(user_ns, cred->fsgid));
 	seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
 
 	seq_puts(m, "\nGroups:\t");
-- 
2.25.0


  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 18:35 [PATCH v2 00/28] user_namespace: introduce fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 01/28] user_namespace: introduce fsid mappings infrastructure Christian Brauner
2020-02-14 18:35 ` [PATCH v2 02/28] proc: add /proc/<pid>/fsuid_map Christian Brauner
2020-02-14 18:35 ` [PATCH v2 03/28] proc: add /proc/<pid>/fsgid_map Christian Brauner
2020-02-14 18:35 ` [PATCH v2 04/28] fsuidgid: add fsid mapping helpers Christian Brauner
2020-02-14 19:11   ` Jann Horn
2020-02-16 16:55     ` Christian Brauner
2020-02-14 18:35 ` Christian Brauner [this message]
2020-02-14 18:35 ` [PATCH v2 06/28] cred: add kfs{g,u}id Christian Brauner
2020-02-14 18:35 ` [PATCH v2 07/28] sys: __sys_setfsuid(): handle fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 08/28] sys: __sys_setfsgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 09/28] sys:__sys_setuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 10/28] sys:__sys_setgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 11/28] sys:__sys_setreuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 12/28] sys:__sys_setregid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 13/28] sys:__sys_setresuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 14/28] sys:__sys_setresgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 15/28] fs: add is_userns_visible() helper Christian Brauner
2020-02-14 18:35 ` [PATCH v2 16/28] namei: may_{o_}create(): handle fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 17/28] inode: inode_owner_or_capable(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 18/28] capability: privileged_wrt_inode_uidgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 19/28] stat: " Christian Brauner
2020-02-14 19:03   ` Tycho Andersen
2020-02-16 14:12     ` Christian Brauner
2020-02-14 18:35 ` [PATCH v2 20/28] open: " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 21/28] posix_acl: " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 22/28] attr: notify_change(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 23/28] commoncap: cap_bprm_set_creds(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 24/28] commoncap: cap_task_fix_setuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 25/28] commoncap: handle fsid mappings with vfs caps Christian Brauner
2020-02-14 18:35 ` [PATCH v2 26/28] exec: bprm_fill_uid(): handle fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 27/28] ptrace: adapt ptrace_may_access() to always uses unmapped fsids Christian Brauner
2020-02-14 18:35 ` [PATCH v2 28/28] devpts: handle fsid mappings Christian Brauner
2020-02-16 15:55 ` [PATCH v2 00/28] user_namespace: introduce " Florian Weimer
2020-02-16 16:40   ` Christian Brauner
2020-02-17 21:06 ` James Bottomley
2020-02-17 21:20   ` Christian Brauner
2020-02-17 22:35     ` James Bottomley
2020-02-17 23:05       ` Christian Brauner
2020-02-17 21:11 ` James Bottomley
     [not found]   ` <CA+enf=vwd-dxzve87t7Mw1Z35RZqdLzVaKq=fZ4EGOpnES0f5w@mail.gmail.com>
2020-02-17 22:02     ` Stéphane Graber
2020-02-17 23:03     ` James Bottomley
2020-02-17 23:11       ` Stéphane Graber

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