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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_MNT_IDMAPPING_H#define _LINUX_MNT_IDMAPPING_H
#include <linux/types.h>#include <linux/uidgid.h>
struct mnt_idmap;struct user_namespace;
extern struct mnt_idmap nop_mnt_idmap;extern struct mnt_idmap invalid_mnt_idmap;extern struct user_namespace init_user_ns;
typedef struct { uid_t val;} vfsuid_t;
typedef struct { gid_t val;} vfsgid_t;
static_assert(sizeof(vfsuid_t) == sizeof(kuid_t));static_assert(sizeof(vfsgid_t) == sizeof(kgid_t));static_assert(offsetof(vfsuid_t, val) == offsetof(kuid_t, val));static_assert(offsetof(vfsgid_t, val) == offsetof(kgid_t, val));
static inline bool is_valid_mnt_idmap(const struct mnt_idmap *idmap){ return idmap != &nop_mnt_idmap && idmap != &invalid_mnt_idmap;}
#ifdef CONFIG_MULTIUSERstatic inline uid_t __vfsuid_val(vfsuid_t uid){ return uid.val;}
static inline gid_t __vfsgid_val(vfsgid_t gid){ return gid.val;}#elsestatic inline uid_t __vfsuid_val(vfsuid_t uid){ return 0;}
static inline gid_t __vfsgid_val(vfsgid_t gid){ return 0;}#endif
static inline bool vfsuid_valid(vfsuid_t uid){ return __vfsuid_val(uid) != (uid_t)-1;}
static inline bool vfsgid_valid(vfsgid_t gid){ return __vfsgid_val(gid) != (gid_t)-1;}
static inline bool vfsuid_eq(vfsuid_t left, vfsuid_t right){ return vfsuid_valid(left) && __vfsuid_val(left) == __vfsuid_val(right);}
static inline bool vfsgid_eq(vfsgid_t left, vfsgid_t right){ return vfsgid_valid(left) && __vfsgid_val(left) == __vfsgid_val(right);}
/** * vfsuid_eq_kuid - check whether kuid and vfsuid have the same value * @vfsuid: the vfsuid to compare * @kuid: the kuid to compare * * Check whether @vfsuid and @kuid have the same values. * * Return: true if @vfsuid and @kuid have the same value, false if not. * Comparison between two invalid uids returns false. */static inline bool vfsuid_eq_kuid(vfsuid_t vfsuid, kuid_t kuid){ return vfsuid_valid(vfsuid) && __vfsuid_val(vfsuid) == __kuid_val(kuid);}
/** * vfsgid_eq_kgid - check whether kgid and vfsgid have the same value * @vfsgid: the vfsgid to compare * @kgid: the kgid to compare * * Check whether @vfsgid and @kgid have the same values. * * Return: true if @vfsgid and @kgid have the same value, false if not. * Comparison between two invalid gids returns false. */static inline bool vfsgid_eq_kgid(vfsgid_t vfsgid, kgid_t kgid){ return vfsgid_valid(vfsgid) && __vfsgid_val(vfsgid) == __kgid_val(kgid);}
/* * vfs{g,u}ids are created from k{g,u}ids. * We don't allow them to be created from regular {u,g}id. */#define VFSUIDT_INIT(val) (vfsuid_t){ __kuid_val(val) }#define VFSGIDT_INIT(val) (vfsgid_t){ __kgid_val(val) }
#define INVALID_VFSUID VFSUIDT_INIT(INVALID_UID)#define INVALID_VFSGID VFSGIDT_INIT(INVALID_GID)
/* * Allow a vfs{g,u}id to be used as a k{g,u}id where we want to compare * whether the mapped value is identical to value of a k{g,u}id. */#define AS_KUIDT(val) (kuid_t){ __vfsuid_val(val) }#define AS_KGIDT(val) (kgid_t){ __vfsgid_val(val) }
int vfsgid_in_group_p(vfsgid_t vfsgid);
struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);void mnt_idmap_put(struct mnt_idmap *idmap);
vfsuid_t make_vfsuid(struct mnt_idmap *idmap, struct user_namespace *fs_userns, kuid_t kuid);
vfsgid_t make_vfsgid(struct mnt_idmap *idmap, struct user_namespace *fs_userns, kgid_t kgid);
kuid_t from_vfsuid(struct mnt_idmap *idmap, struct user_namespace *fs_userns, vfsuid_t vfsuid);
kgid_t from_vfsgid(struct mnt_idmap *idmap, struct user_namespace *fs_userns, vfsgid_t vfsgid);
/** * vfsuid_has_fsmapping - check whether a vfsuid maps into the filesystem * @idmap: the mount's idmapping * @fs_userns: the filesystem's idmapping * @vfsuid: vfsuid to be mapped * * Check whether @vfsuid has a mapping in the filesystem idmapping. Use this * function to check whether the filesystem idmapping has a mapping for * @vfsuid. * * Return: true if @vfsuid has a mapping in the filesystem, false if not. */static inline bool vfsuid_has_fsmapping(struct mnt_idmap *idmap, struct user_namespace *fs_userns, vfsuid_t vfsuid){ return uid_valid(from_vfsuid(idmap, fs_userns, vfsuid));}
static inline bool vfsuid_has_mapping(struct user_namespace *userns, vfsuid_t vfsuid){ return from_kuid(userns, AS_KUIDT(vfsuid)) != (uid_t)-1;}
/** * vfsuid_into_kuid - convert vfsuid into kuid * @vfsuid: the vfsuid to convert * * This can be used when a vfsuid is committed as a kuid. * * Return: a kuid with the value of @vfsuid */static inline kuid_t vfsuid_into_kuid(vfsuid_t vfsuid){ return AS_KUIDT(vfsuid);}
/** * vfsgid_has_fsmapping - check whether a vfsgid maps into the filesystem * @idmap: the mount's idmapping * @fs_userns: the filesystem's idmapping * @vfsgid: vfsgid to be mapped * * Check whether @vfsgid has a mapping in the filesystem idmapping. Use this * function to check whether the filesystem idmapping has a mapping for * @vfsgid. * * Return: true if @vfsgid has a mapping in the filesystem, false if not. */static inline bool vfsgid_has_fsmapping(struct mnt_idmap *idmap, struct user_namespace *fs_userns, vfsgid_t vfsgid){ return gid_valid(from_vfsgid(idmap, fs_userns, vfsgid));}
static inline bool vfsgid_has_mapping(struct user_namespace *userns, vfsgid_t vfsgid){ return from_kgid(userns, AS_KGIDT(vfsgid)) != (gid_t)-1;}
/** * vfsgid_into_kgid - convert vfsgid into kgid * @vfsgid: the vfsgid to convert * * This can be used when a vfsgid is committed as a kgid. * * Return: a kgid with the value of @vfsgid */static inline kgid_t vfsgid_into_kgid(vfsgid_t vfsgid){ return AS_KGIDT(vfsgid);}
/** * mapped_fsuid - return caller's fsuid mapped according to an idmapping * @idmap: the mount's idmapping * @fs_userns: the filesystem's idmapping * * Use this helper to initialize a new vfs or filesystem object based on * the caller's fsuid. A common example is initializing the i_uid field of * a newly allocated inode triggered by a creation event such as mkdir or * O_CREAT. Other examples include the allocation of quotas for a specific * user. * * Return: the caller's current fsuid mapped up according to @idmap. */static inline kuid_t mapped_fsuid(struct mnt_idmap *idmap, struct user_namespace *fs_userns){ return from_vfsuid(idmap, fs_userns, VFSUIDT_INIT(current_fsuid()));}
/** * mapped_fsgid - return caller's fsgid mapped according to an idmapping * @idmap: the mount's idmapping * @fs_userns: the filesystem's idmapping * * Use this helper to initialize a new vfs or filesystem object based on * the caller's fsgid. A common example is initializing the i_gid field of * a newly allocated inode triggered by a creation event such as mkdir or * O_CREAT. Other examples include the allocation of quotas for a specific * user. * * Return: the caller's current fsgid mapped up according to @idmap. */static inline kgid_t mapped_fsgid(struct mnt_idmap *idmap, struct user_namespace *fs_userns){ return from_vfsgid(idmap, fs_userns, VFSGIDT_INIT(current_fsgid()));}
#endif /* _LINUX_MNT_IDMAPPING_H */