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mqueue: set ->user_ns before ->get_tree() 

... so that we could lift the capability checks into ->get_tree()
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
alistair/sunxi64-5.4-dsi
Al Viro 2019-05-12 17:46:05 -04:00
parent 20284ab742
commit 709a643da8
1 changed files with 5 additions and 4 deletions
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9
ipc/mqueue.c
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@ -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);