/* * xenfs.c - a filesystem for passing info between the a domain and * the hypervisor. * * 2008-10-07 Alex Zeffertt Replaced /proc/xen/xenbus with xenfs filesystem * and /proc/xen compatibility mount point. * Turned xenfs into a loadable module. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include "xenfs.h" #include "../privcmd.h" #include "../xenbus/xenbus_comms.h" #include MODULE_DESCRIPTION("Xen filesystem"); MODULE_LICENSE("GPL"); static ssize_t capabilities_read(struct file *file, char __user *buf, size_t size, loff_t *off) { char *tmp = ""; if (xen_initial_domain()) tmp = "control_d\n"; return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp)); } static const struct file_operations capabilities_file_ops = { .read = capabilities_read, .llseek = default_llseek, }; static int xenfs_fill_super(struct super_block *sb, void *data, int silent) { static struct tree_descr xenfs_files[] = { [2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR }, { "capabilities", &capabilities_file_ops, S_IRUGO }, { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, {""}, }; static struct tree_descr xenfs_init_files[] = { [2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR }, { "capabilities", &capabilities_file_ops, S_IRUGO }, { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR }, { "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR}, { "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR}, #ifdef CONFIG_XEN_SYMS { "xensyms", &xensyms_ops, S_IRUSR}, #endif {""}, }; return simple_fill_super(sb, XENFS_SUPER_MAGIC, xen_initial_domain() ? xenfs_init_files : xenfs_files); } static struct dentry *xenfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return mount_single(fs_type, flags, data, xenfs_fill_super); } static struct file_system_type xenfs_type = { .owner = THIS_MODULE, .name = "xenfs", .mount = xenfs_mount, .kill_sb = kill_litter_super, }; MODULE_ALIAS_FS("xenfs"); static int __init xenfs_init(void) { if (xen_domain()) return register_filesystem(&xenfs_type); pr_info("not registering filesystem on non-xen platform\n"); return 0; } static void __exit xenfs_exit(void) { if (xen_domain()) unregister_filesystem(&xenfs_type); } module_init(xenfs_init); module_exit(xenfs_exit);
path: root/include/dt-bindings/dma/nbpfaxi.h
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authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /include/dt-bindings/dma/nbpfaxi.h
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'include/dt-bindings/dma/nbpfaxi.h')