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, 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>,
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 18/24] sys:__sys_setuid(): handle fsid mappings
Date: Tue, 11 Feb 2020 17:57:47 +0100 [thread overview]
Message-ID: <20200211165753.356508-19-christian.brauner@ubuntu.com> (raw)
In-Reply-To: <20200211165753.356508-1-christian.brauner@ubuntu.com>
Switch setuid() to lookup fsids in the fsid mappings. If no fsid mappings are
setup the behavior is unchanged, i.e. fsids are looked up in the id mappings.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
kernel/sys.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/sys.c b/kernel/sys.c
index b89334ad0908..afaec8d46bc5 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -574,11 +574,16 @@ long __sys_setuid(uid_t uid)
struct cred *new;
int retval;
kuid_t kuid;
+ kuid_t kfsuid;
kuid = make_kuid(ns, uid);
if (!uid_valid(kuid))
return -EINVAL;
+ kfsuid = make_kfsuid(ns, uid);
+ if (!uid_valid(kfsuid))
+ return -EINVAL;
+
new = prepare_creds();
if (!new)
return -ENOMEM;
@@ -596,7 +601,8 @@ long __sys_setuid(uid_t uid)
goto error;
}
- new->fsuid = new->euid = kuid;
+ new->euid = kuid;
+ new->fsuid = kfsuid;
retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
if (retval < 0)
--
2.25.0
next prev parent reply other threads:[~2020-02-11 17:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 16:57 [PATCH 00/24] user_namespace: introduce fsid mappings Christian Brauner
2020-02-11 16:57 ` [PATCH 01/24] user_namespace: introduce fsid mappings infrastructure Christian Brauner
2020-02-11 17:26 ` Randy Dunlap
2020-02-11 16:57 ` [PATCH 02/24] proc: add /proc/<pid>/fsuid_map Christian Brauner
2020-02-11 16:57 ` [PATCH 03/24] proc: add /proc/<pid>/fsgid_map Christian Brauner
2020-02-11 16:57 ` [PATCH 04/24] fsuidgid: add fsid mapping helpers Christian Brauner
2020-02-11 16:57 ` [PATCH 05/24] proc: task_state(): use from_kfs{g,u}id_munged Christian Brauner
2020-02-11 16:57 ` [PATCH 06/24] fs: add is_userns_visible() helper Christian Brauner
2020-02-11 16:57 ` [PATCH 07/24] namei: may_{o_}create(): handle fsid mappings Christian Brauner
2020-02-11 16:57 ` [PATCH 08/24] inode: inode_owner_or_capable(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 09/24] capability: privileged_wrt_inode_uidgid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 10/24] stat: " Christian Brauner
2020-02-11 16:57 ` [PATCH 11/24] open: chown_common(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 12/24] posix_acl: " Christian Brauner
2020-02-11 16:57 ` [PATCH 13/24] attr: notify_change(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 14/24] commoncap: cap_task_fix_setuid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 15/24] commoncap:cap_bprm_set_creds(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 16/24] sys: __sys_setfsuid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 17/24] sys: __sys_setfsgid(): " Christian Brauner
2020-02-11 16:57 ` Christian Brauner [this message]
2020-02-11 16:57 ` [PATCH 19/24] sys:__sys_setgid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 20/24] sys:__sys_setreuid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 21/24] sys:__sys_setregid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 22/24] sys:__sys_setresuid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 23/24] sys:__sys_setresgid(): " Christian Brauner
2020-02-11 16:57 ` [PATCH 24/24] devpts: " Christian Brauner
2020-02-11 20:55 ` [PATCH 00/24] user_namespace: introduce " Jann Horn
2020-02-12 14:51 ` Christian Brauner
2020-02-12 18:53 ` Jann Horn
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