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authorAl Viro <viro@zeniv.linux.org.uk>2019-05-12 17:46:05 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2019-05-25 18:00:00 -0400
commit709a643da8b8c5fc823e1870d8227ca0eeb51311 (patch)
treeb58fcd3e635d2949f903a1f6bd5d3308a99ee036 /ipc
parent20284ab7427ffac514faf44fd9eb50e5745f4474 (diff)
downloadlinux-stericsson-709a643da8b8c5fc823e1870d8227ca0eeb51311.tar.gz
mqueue: set ->user_ns before ->get_tree()
... so that we could lift the capability checks into ->get_tree() caller Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/mqueue.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 216cad1ff0d0..9f8e4cbcec00 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -364,8 +364,6 @@ static int mqueue_get_tree(struct fs_context *fc)
{
struct mqueue_fs_context *ctx = fc->fs_private;
- put_user_ns(fc->user_ns);
- fc->user_ns = get_user_ns(ctx->ipc_ns->user_ns);
fc->s_fs_info = ctx->ipc_ns;
return vfs_get_super(fc, vfs_get_keyed_super, mqueue_fill_super);
}
@@ -374,8 +372,7 @@ static void mqueue_fs_context_free(struct fs_context *fc)
{
struct mqueue_fs_context *ctx = fc->fs_private;
- if (ctx->ipc_ns)
- put_ipc_ns(ctx->ipc_ns);
+ put_ipc_ns(ctx->ipc_ns);
kfree(ctx);
}
@@ -388,6 +385,8 @@ static int mqueue_init_fs_context(struct fs_context *fc)
return -ENOMEM;
ctx->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns);
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(ctx->ipc_ns->user_ns);
fc->fs_private = ctx;
fc->ops = &mqueue_fs_context_ops;
return 0;
@@ -406,6 +405,8 @@ static struct vfsmount *mq_create_mount(struct ipc_namespace *ns)
ctx = fc->fs_private;
put_ipc_ns(ctx->ipc_ns);
ctx->ipc_ns = get_ipc_ns(ns);
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(ctx->ipc_ns->user_ns);
mnt = fc_mount(fc);
put_fs_context(fc);