diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/projid.h | 104 | ||||
| -rw-r--r-- | include/linux/user_namespace.h | 3 |
2 files changed, 107 insertions, 0 deletions
diff --git a/include/linux/projid.h b/include/linux/projid.h new file mode 100644 index 00000000000..36517b95be5 --- /dev/null +++ b/include/linux/projid.h @@ -0,0 +1,104 @@ +#ifndef _LINUX_PROJID_H +#define _LINUX_PROJID_H + +/* + * A set of types for the internal kernel types representing project ids. + * + * The types defined in this header allow distinguishing which project ids in + * the kernel are values used by userspace and which project id values are + * the internal kernel values. With the addition of user namespaces the values + * can be different. Using the type system makes it possible for the compiler + * to detect when we overlook these differences. + * + */ +#include <linux/types.h> + +struct user_namespace; +extern struct user_namespace init_user_ns; + +typedef __kernel_uid32_t projid_t; + +#ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS + +typedef struct { + projid_t val; +} kprojid_t; + +static inline projid_t __kprojid_val(kprojid_t projid) +{ + return projid.val; +} + +#define KPROJIDT_INIT(value) (kprojid_t){ value } + +#else + +typedef projid_t kprojid_t; + +static inline projid_t __kprojid_val(kprojid_t projid) +{ + return projid; +} + +#define KPROJIDT_INIT(value) ((kprojid_t) value ) + +#endif + +#define INVALID_PROJID KPROJIDT_INIT(-1) +#define OVERFLOW_PROJID 65534 + +static inline bool projid_eq(kprojid_t left, kprojid_t right) +{ + return __kprojid_val(left) == __kprojid_val(right); +} + +static inline bool projid_lt(kprojid_t left, kprojid_t right) +{ + return __kprojid_val(left) < __kprojid_val(right); +} + +static inline bool projid_valid(kprojid_t projid) +{ + return !projid_eq(projid, INVALID_PROJID); +} + +#ifdef CONFIG_USER_NS + +extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid); + +extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid); +extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid); + +static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid) +{ + return from_kprojid(ns, projid) != (projid_t)-1; +} + +#else + +static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid) +{ + return KPROJIDT_INIT(projid); +} + +static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid) +{ + return __kprojid_val(kprojid); +} + +static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid) +{ + projid_t projid = from_kprojid(to, kprojid); + if (projid == (projid_t)-1) + projid = OVERFLOW_PROJID; + return projid; +} + +static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid) +{ + return true; +} + +#endif /* CONFIG_USER_NS */ + +#endif /* _LINUX_PROJID_H */ diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index 4e72922e5a7..95142cae446 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -20,6 +20,7 @@ struct uid_gid_map { /* 64 bytes -- 1 cache line */ struct user_namespace { struct uid_gid_map uid_map; struct uid_gid_map gid_map; + struct uid_gid_map projid_map; struct kref kref; struct user_namespace *parent; kuid_t owner; @@ -49,8 +50,10 @@ static inline void put_user_ns(struct user_namespace *ns) struct seq_operations; extern struct seq_operations proc_uid_seq_operations; extern struct seq_operations proc_gid_seq_operations; +extern struct seq_operations proc_projid_seq_operations; extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); +extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *); #else static inline struct user_namespace *get_user_ns(struct user_namespace *ns) |