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| author | Eric W. Biederman <ebiederm@xmission.com> | 2014-12-09 14:03:14 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-08 10:30:26 -0800 |
| commit | 54b8ced1efd4a5f2746ff98b34b8c9bee7c6b80d (patch) | |
| tree | debea70024ff87f04e21c607428706b6252a7265 | |
| parent | 39d3003edf610a4fefdba0e0758aeca89d3d720d (diff) | |
| download | lwn-54b8ced1efd4a5f2746ff98b34b8c9bee7c6b80d.tar.gz lwn-54b8ced1efd4a5f2746ff98b34b8c9bee7c6b80d.zip | |
userns: Rename id_map_mutex to userns_state_mutex
commit f0d62aec931e4ae3333c797d346dc4f188f454ba upstream.
Generalize id_map_mutex so it can be used for more state of a user namespace.
Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/user_namespace.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 1e34de2fbd60..44a555ac6104 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -24,6 +24,7 @@ #include <linux/fs_struct.h> static struct kmem_cache *user_ns_cachep __read_mostly; +static DEFINE_MUTEX(userns_state_mutex); static bool new_idmap_permitted(const struct file *file, struct user_namespace *ns, int cap_setid, @@ -583,9 +584,6 @@ static bool mappings_overlap(struct uid_gid_map *new_map, return false; } - -static DEFINE_MUTEX(id_map_mutex); - static ssize_t map_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos, int cap_setid, @@ -602,7 +600,7 @@ static ssize_t map_write(struct file *file, const char __user *buf, ssize_t ret = -EINVAL; /* - * The id_map_mutex serializes all writes to any given map. + * The userns_state_mutex serializes all writes to any given map. * * Any map is only ever written once. * @@ -620,7 +618,7 @@ static ssize_t map_write(struct file *file, const char __user *buf, * order and smp_rmb() is guaranteed that we don't have crazy * architectures returning stale data. */ - mutex_lock(&id_map_mutex); + mutex_lock(&userns_state_mutex); ret = -EPERM; /* Only allow one successful write to the map */ @@ -750,7 +748,7 @@ static ssize_t map_write(struct file *file, const char __user *buf, *ppos = count; ret = count; out: - mutex_unlock(&id_map_mutex); + mutex_unlock(&userns_state_mutex); if (page) free_page(page); return ret; @@ -845,12 +843,12 @@ bool userns_may_setgroups(const struct user_namespace *ns) { bool allowed; - mutex_lock(&id_map_mutex); + mutex_lock(&userns_state_mutex); /* It is not safe to use setgroups until a gid mapping in * the user namespace has been established. */ allowed = ns->gid_map.nr_extents != 0; - mutex_unlock(&id_map_mutex); + mutex_unlock(&userns_state_mutex); return allowed; } |