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| author | Eric W. Biederman <ebiederm@xmission.com> | 2014-12-05 19:36:04 -0600 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2014-12-11 18:07:06 -0600 |
| commit | 66d2f338ee4c449396b6f99f5e75cd18eb6df272 (patch) | |
| tree | 6ee765ac11630eb41207b1b4f4202c4d602fa459 /kernel/user_namespace.c | |
| parent | 9cc46516ddf497ea16e8d7cb986ae03a0f6b92f8 (diff) | |
| download | lwn-66d2f338ee4c449396b6f99f5e75cd18eb6df272.tar.gz lwn-66d2f338ee4c449396b6f99f5e75cd18eb6df272.zip | |
userns: Allow setting gid_maps without privilege when setgroups is disabled
Now that setgroups can be disabled and not reenabled, setting gid_map
without privielge can now be enabled when setgroups is disabled.
This restores most of the functionality that was lost when unprivileged
setting of gid_map was removed. Applications that use this functionality
will need to check to see if they use setgroups or init_groups, and if they
don't they can be fixed by simply disabling setgroups before writing to
gid_map.
Cc: stable@vger.kernel.org
Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/user_namespace.c')
| -rw-r--r-- | kernel/user_namespace.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 6e80f4c1322b..a2e37c5d2f63 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -826,6 +826,11 @@ static bool new_idmap_permitted(const struct file *file, kuid_t uid = make_kuid(ns->parent, id); if (uid_eq(uid, cred->euid)) return true; + } else if (cap_setid == CAP_SETGID) { + kgid_t gid = make_kgid(ns->parent, id); + if (!(ns->flags & USERNS_SETGROUPS_ALLOWED) && + gid_eq(gid, cred->egid)) + return true; } } |