tjh.dev / kernel
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sysfs: Allow mounting without CONFIG_NET

In kobj_ns_current_may_mount the default should be to allow the mount.
The test is only for a single kobj_ns_type at a time, and unless there
is a reason to prevent it the mounting sysfs should be allowed.
Subsystems that are not registered can't have are not involved so can't
have a reason to prevent mounting sysfs.

This is a bug-fix to commit 7dc5dbc879bd ("sysfs: Restrict mounting
sysfs") that came in via the userns tree during the 3.12 merge window.

Reported-and-tested-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Eric W. Biederman and committed by
Linus Torvalds 730d7d33 d2212b4d

+1 -4
+1 -4
lib/kobject.c
··· 933 933 934 934 bool kobj_ns_current_may_mount(enum kobj_ns_type type) 935 935 { 936 - bool may_mount = false; 937 - 938 - if (type == KOBJ_NS_TYPE_NONE) 939 - return true; 936 + bool may_mount = true; 940 937 941 938 spin_lock(&kobj_ns_type_lock); 942 939 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&