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fs/posix_acl.c
24.1 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2002,2003 by Andreas Gruenbacher <a.gruenbacher@computer.org> |
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* |
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* Fixes from William Schumacher incorporated on 15 March 2001. * (Reported by Charles Bertsch, <CBertsch@microtest.com>). |
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*/ /* * This file contains generic functions for manipulating * POSIX 1003.1e draft standard 17 ACLs. */ #include <linux/kernel.h> #include <linux/slab.h> |
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#include <linux/atomic.h> |
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#include <linux/fs.h> #include <linux/sched.h> |
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#include <linux/cred.h> |
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#include <linux/posix_acl.h> |
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#include <linux/posix_acl_xattr.h> |
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#include <linux/xattr.h> |
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#include <linux/export.h> |
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#include <linux/user_namespace.h> |
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#include <linux/namei.h> |
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#include <linux/mnt_idmapping.h> |
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|
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static struct posix_acl **acl_by_type(struct inode *inode, int type) |
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{ switch (type) { case ACL_TYPE_ACCESS: return &inode->i_acl; case ACL_TYPE_DEFAULT: return &inode->i_default_acl; default: BUG(); } } |
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struct posix_acl *get_cached_acl(struct inode *inode, int type) { struct posix_acl **p = acl_by_type(inode, type); |
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struct posix_acl *acl; for (;;) { rcu_read_lock(); acl = rcu_dereference(*p); if (!acl || is_uncached_acl(acl) || |
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refcount_inc_not_zero(&acl->a_refcount)) |
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break; rcu_read_unlock(); cpu_relax(); |
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} |
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rcu_read_unlock(); |
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return acl; } EXPORT_SYMBOL(get_cached_acl); struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type) { |
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struct posix_acl *acl = rcu_dereference(*acl_by_type(inode, type)); if (acl == ACL_DONT_CACHE) { struct posix_acl *ret; ret = inode->i_op->get_acl(inode, type, LOOKUP_RCU); if (!IS_ERR(ret)) acl = ret; } return acl; |
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} EXPORT_SYMBOL(get_cached_acl_rcu); void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl) { struct posix_acl **p = acl_by_type(inode, type); struct posix_acl *old; |
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old = xchg(p, posix_acl_dup(acl)); if (!is_uncached_acl(old)) |
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posix_acl_release(old); } EXPORT_SYMBOL(set_cached_acl); |
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static void __forget_cached_acl(struct posix_acl **p) |
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{ |
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struct posix_acl *old; |
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old = xchg(p, ACL_NOT_CACHED); if (!is_uncached_acl(old)) |
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posix_acl_release(old); } |
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void forget_cached_acl(struct inode *inode, int type) { __forget_cached_acl(acl_by_type(inode, type)); } |
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EXPORT_SYMBOL(forget_cached_acl); void forget_all_cached_acls(struct inode *inode) { |
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__forget_cached_acl(&inode->i_acl); __forget_cached_acl(&inode->i_default_acl); |
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} EXPORT_SYMBOL(forget_all_cached_acls); |
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|
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struct posix_acl *get_acl(struct inode *inode, int type) { |
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void *sentinel; struct posix_acl **p; |
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struct posix_acl *acl; |
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/* * The sentinel is used to detect when another operation like * set_cached_acl() or forget_cached_acl() races with get_acl(). * It is guaranteed that is_uncached_acl(sentinel) is true. */ |
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acl = get_cached_acl(inode, type); |
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if (!is_uncached_acl(acl)) |
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return acl; if (!IS_POSIXACL(inode)) return NULL; |
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sentinel = uncached_acl_sentinel(current); p = acl_by_type(inode, type); /* * If the ACL isn't being read yet, set our sentinel. Otherwise, the * current value of the ACL will not be ACL_NOT_CACHED and so our own * sentinel will not be set; another task will update the cache. We * could wait for that other task to complete its job, but it's easier * to just call ->get_acl to fetch the ACL ourself. (This is going to * be an unlikely race.) */ if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) /* fall through */ ; |
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/* |
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* Normally, the ACL returned by ->get_acl will be cached. * A filesystem can prevent that by calling * forget_cached_acl(inode, type) in ->get_acl. |
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* * If the filesystem doesn't have a get_acl() function at all, we'll * just create the negative cache entry. */ if (!inode->i_op->get_acl) { set_cached_acl(inode, type, NULL); return NULL; } |
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acl = inode->i_op->get_acl(inode, type, false); |
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if (IS_ERR(acl)) { /* * Remove our sentinel so that we don't block future attempts * to cache the ACL. */ cmpxchg(p, sentinel, ACL_NOT_CACHED); return acl; } /* * Cache the result, but only if our sentinel is still in place. */ posix_acl_dup(acl); if (unlikely(cmpxchg(p, sentinel, acl) != sentinel)) posix_acl_release(acl); return acl; |
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} EXPORT_SYMBOL(get_acl); |
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/* |
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* Init a fresh posix_acl */ void posix_acl_init(struct posix_acl *acl, int count) { |
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refcount_set(&acl->a_refcount, 1); |
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acl->a_count = count; } |
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EXPORT_SYMBOL(posix_acl_init); |
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/* |
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* Allocate a new ACL with the specified number of entries. */ struct posix_acl * |
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posix_acl_alloc(int count, gfp_t flags) |
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{ const size_t size = sizeof(struct posix_acl) + count * sizeof(struct posix_acl_entry); struct posix_acl *acl = kmalloc(size, flags); |
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if (acl) posix_acl_init(acl, count); |
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return acl; } |
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EXPORT_SYMBOL(posix_acl_alloc); |
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/* * Clone an ACL. */ |
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static struct posix_acl * |
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posix_acl_clone(const struct posix_acl *acl, gfp_t flags) |
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{ struct posix_acl *clone = NULL; if (acl) { int size = sizeof(struct posix_acl) + acl->a_count * sizeof(struct posix_acl_entry); |
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clone = kmemdup(acl, size, flags); if (clone) |
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refcount_set(&clone->a_refcount, 1); |
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} return clone; } /* * Check if an acl is valid. Returns 0 if it is, or -E... otherwise. */ int |
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posix_acl_valid(struct user_namespace *user_ns, const struct posix_acl *acl) |
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{ const struct posix_acl_entry *pa, *pe; int state = ACL_USER_OBJ; |
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int needs_mask = 0; FOREACH_ACL_ENTRY(pa, acl, pe) { if (pa->e_perm & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE)) return -EINVAL; switch (pa->e_tag) { case ACL_USER_OBJ: if (state == ACL_USER_OBJ) { |
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state = ACL_USER; break; } return -EINVAL; case ACL_USER: if (state != ACL_USER) return -EINVAL; |
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if (!kuid_has_mapping(user_ns, pa->e_uid)) |
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return -EINVAL; |
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needs_mask = 1; break; case ACL_GROUP_OBJ: if (state == ACL_USER) { |
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state = ACL_GROUP; break; } return -EINVAL; case ACL_GROUP: if (state != ACL_GROUP) return -EINVAL; |
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if (!kgid_has_mapping(user_ns, pa->e_gid)) |
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return -EINVAL; |
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needs_mask = 1; break; case ACL_MASK: if (state != ACL_GROUP) return -EINVAL; state = ACL_OTHER; break; case ACL_OTHER: if (state == ACL_OTHER || (state == ACL_GROUP && !needs_mask)) { state = 0; break; } return -EINVAL; default: return -EINVAL; } } if (state == 0) return 0; return -EINVAL; } |
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EXPORT_SYMBOL(posix_acl_valid); |
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/* * Returns 0 if the acl can be exactly represented in the traditional * file mode permission bits, or else 1. Returns -E... on error. */ int |
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posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p) |
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{ const struct posix_acl_entry *pa, *pe; |
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umode_t mode = 0; |
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int not_equiv = 0; |
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/* * A null ACL can always be presented as mode bits. */ if (!acl) return 0; |
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FOREACH_ACL_ENTRY(pa, acl, pe) { switch (pa->e_tag) { case ACL_USER_OBJ: mode |= (pa->e_perm & S_IRWXO) << 6; break; case ACL_GROUP_OBJ: mode |= (pa->e_perm & S_IRWXO) << 3; break; case ACL_OTHER: mode |= pa->e_perm & S_IRWXO; break; case ACL_MASK: mode = (mode & ~S_IRWXG) | ((pa->e_perm & S_IRWXO) << 3); not_equiv = 1; break; case ACL_USER: case ACL_GROUP: not_equiv = 1; break; default: return -EINVAL; } } if (mode_p) *mode_p = (*mode_p & ~S_IRWXUGO) | mode; return not_equiv; } |
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EXPORT_SYMBOL(posix_acl_equiv_mode); |
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/* * Create an ACL representing the file mode permission bits of an inode. */ struct posix_acl * |
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posix_acl_from_mode(umode_t mode, gfp_t flags) |
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{ struct posix_acl *acl = posix_acl_alloc(3, flags); if (!acl) return ERR_PTR(-ENOMEM); acl->a_entries[0].e_tag = ACL_USER_OBJ; |
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acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6; acl->a_entries[1].e_tag = ACL_GROUP_OBJ; |
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acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3; acl->a_entries[2].e_tag = ACL_OTHER; |
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acl->a_entries[2].e_perm = (mode & S_IRWXO); return acl; } |
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EXPORT_SYMBOL(posix_acl_from_mode); |
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/* * Return 0 if current is granted want access to the inode * by the acl. Returns -E... otherwise. */ int |
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posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode, const struct posix_acl *acl, int want) |
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{ const struct posix_acl_entry *pa, *pe, *mask_obj; int found = 0; |
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kuid_t uid; kgid_t gid; |
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|
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want &= MAY_READ | MAY_WRITE | MAY_EXEC; |
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|
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FOREACH_ACL_ENTRY(pa, acl, pe) { switch(pa->e_tag) { case ACL_USER_OBJ: /* (May have been checked already) */ |
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uid = i_uid_into_mnt(mnt_userns, inode); if (uid_eq(uid, current_fsuid())) |
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goto check_perm; break; case ACL_USER: |
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uid = mapped_kuid_fs(mnt_userns, |
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i_user_ns(inode), pa->e_uid); |
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if (uid_eq(uid, current_fsuid())) |
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goto mask; break; case ACL_GROUP_OBJ: |
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gid = i_gid_into_mnt(mnt_userns, inode); if (in_group_p(gid)) { |
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found = 1; if ((pa->e_perm & want) == want) goto mask; } break; case ACL_GROUP: |
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gid = mapped_kgid_fs(mnt_userns, |
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i_user_ns(inode), pa->e_gid); |
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if (in_group_p(gid)) { |
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found = 1; if ((pa->e_perm & want) == want) goto mask; } break; case ACL_MASK: break; case ACL_OTHER: if (found) return -EACCES; else goto check_perm; default: return -EIO; } } return -EIO; mask: for (mask_obj = pa+1; mask_obj != pe; mask_obj++) { if (mask_obj->e_tag == ACL_MASK) { if ((pa->e_perm & mask_obj->e_perm & want) == want) return 0; return -EACCES; } } check_perm: if ((pa->e_perm & want) == want) return 0; return -EACCES; } /* * Modify acl when creating a new inode. The caller must ensure the acl is * only referenced once. * * mode_p initially must contain the mode parameter to the open() / creat() * system calls. All permissions that are not granted by the acl are removed. * The permissions in the acl are changed to reflect the mode_p parameter. */ |
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static int posix_acl_create_masq(struct posix_acl *acl, umode_t *mode_p) |
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{ struct posix_acl_entry *pa, *pe; struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; |
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umode_t mode = *mode_p; |
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int not_equiv = 0; /* assert(atomic_read(acl->a_refcount) == 1); */ FOREACH_ACL_ENTRY(pa, acl, pe) { switch(pa->e_tag) { case ACL_USER_OBJ: pa->e_perm &= (mode >> 6) | ~S_IRWXO; mode &= (pa->e_perm << 6) | ~S_IRWXU; break; case ACL_USER: case ACL_GROUP: not_equiv = 1; break; case ACL_GROUP_OBJ: group_obj = pa; break; case ACL_OTHER: pa->e_perm &= mode | ~S_IRWXO; mode &= pa->e_perm | ~S_IRWXO; break; case ACL_MASK: mask_obj = pa; not_equiv = 1; break; default: return -EIO; } } if (mask_obj) { mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO; mode &= (mask_obj->e_perm << 3) | ~S_IRWXG; } else { if (!group_obj) return -EIO; group_obj->e_perm &= (mode >> 3) | ~S_IRWXO; mode &= (group_obj->e_perm << 3) | ~S_IRWXG; } *mode_p = (*mode_p & ~S_IRWXUGO) | mode; return not_equiv; } /* * Modify the ACL for the chmod syscall. */ |
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static int __posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode) |
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{ struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; struct posix_acl_entry *pa, *pe; /* assert(atomic_read(acl->a_refcount) == 1); */ FOREACH_ACL_ENTRY(pa, acl, pe) { switch(pa->e_tag) { case ACL_USER_OBJ: pa->e_perm = (mode & S_IRWXU) >> 6; break; case ACL_USER: case ACL_GROUP: break; case ACL_GROUP_OBJ: group_obj = pa; break; case ACL_MASK: mask_obj = pa; break; case ACL_OTHER: pa->e_perm = (mode & S_IRWXO); break; default: return -EIO; } } if (mask_obj) { mask_obj->e_perm = (mode & S_IRWXG) >> 3; } else { if (!group_obj) return -EIO; group_obj->e_perm = (mode & S_IRWXG) >> 3; } return 0; } |
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int |
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__posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p) |
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{ struct posix_acl *clone = posix_acl_clone(*acl, gfp); int err = -ENOMEM; if (clone) { err = posix_acl_create_masq(clone, mode_p); if (err < 0) { posix_acl_release(clone); clone = NULL; } } posix_acl_release(*acl); *acl = clone; return err; } |
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EXPORT_SYMBOL(__posix_acl_create); |
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int |
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__posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode) |
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{ struct posix_acl *clone = posix_acl_clone(*acl, gfp); int err = -ENOMEM; if (clone) { |
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err = __posix_acl_chmod_masq(clone, mode); |
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if (err) { posix_acl_release(clone); clone = NULL; } } posix_acl_release(*acl); *acl = clone; return err; } |
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EXPORT_SYMBOL(__posix_acl_chmod); |
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/** * posix_acl_chmod - chmod a posix acl * * @mnt_userns: user namespace of the mount @inode was found from * @inode: inode to check permissions on * @mode: the new mode of @inode * * If the inode has been found through an idmapped mount the user namespace of * the vfsmount must be passed through @mnt_userns. This function will then * take care to map the inode according to @mnt_userns before checking * permissions. On non-idmapped mounts or if permission checking is to be * performed on the raw inode simply passs init_user_ns. */ |
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int |
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582 583 |
posix_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode, umode_t mode) |
5bf3258fd fs: make posix_ac... |
584 585 586 587 588 589 590 591 592 593 |
{ struct posix_acl *acl; int ret = 0; if (!IS_POSIXACL(inode)) return 0; if (!inode->i_op->set_acl) return -EOPNOTSUPP; acl = get_acl(inode, ACL_TYPE_ACCESS); |
789b663ae fs: get_acl() mus... |
594 595 596 |
if (IS_ERR_OR_NULL(acl)) { if (acl == ERR_PTR(-EOPNOTSUPP)) return 0; |
5bf3258fd fs: make posix_ac... |
597 |
return PTR_ERR(acl); |
789b663ae fs: get_acl() mus... |
598 |
} |
5bf3258fd fs: make posix_ac... |
599 |
|
37bc15392 fs: make posix_ac... |
600 |
ret = __posix_acl_chmod(&acl, GFP_KERNEL, mode); |
5bf3258fd fs: make posix_ac... |
601 602 |
if (ret) return ret; |
549c72977 fs: make helpers ... |
603 |
ret = inode->i_op->set_acl(mnt_userns, inode, acl, ACL_TYPE_ACCESS); |
5bf3258fd fs: make posix_ac... |
604 605 606 |
posix_acl_release(acl); return ret; } |
bc26ab5f6 kill boilerplate ... |
607 |
EXPORT_SYMBOL(posix_acl_chmod); |
5c8ebd57b fs: merge xattr_a... |
608 |
|
37bc15392 fs: make posix_ac... |
609 610 611 612 613 |
int posix_acl_create(struct inode *dir, umode_t *mode, struct posix_acl **default_acl, struct posix_acl **acl) { struct posix_acl *p; |
c0c3a718e fs/posix_acl.c: m... |
614 |
struct posix_acl *clone; |
37bc15392 fs: make posix_ac... |
615 |
int ret; |
c0c3a718e fs/posix_acl.c: m... |
616 617 |
*acl = NULL; *default_acl = NULL; |
37bc15392 fs: make posix_ac... |
618 |
if (S_ISLNK(*mode) || !IS_POSIXACL(dir)) |
c0c3a718e fs/posix_acl.c: m... |
619 |
return 0; |
37bc15392 fs: make posix_ac... |
620 621 |
p = get_acl(dir, ACL_TYPE_DEFAULT); |
c0c3a718e fs/posix_acl.c: m... |
622 623 624 |
if (!p || p == ERR_PTR(-EOPNOTSUPP)) { *mode &= ~current_umask(); return 0; |
37bc15392 fs: make posix_ac... |
625 |
} |
c0c3a718e fs/posix_acl.c: m... |
626 627 |
if (IS_ERR(p)) return PTR_ERR(p); |
37bc15392 fs: make posix_ac... |
628 |
|
beaf226b8 posix_acl: don't ... |
629 |
ret = -ENOMEM; |
c0c3a718e fs/posix_acl.c: m... |
630 631 |
clone = posix_acl_clone(p, GFP_NOFS); if (!clone) |
beaf226b8 posix_acl: don't ... |
632 |
goto err_release; |
37bc15392 fs: make posix_ac... |
633 |
|
c0c3a718e fs/posix_acl.c: m... |
634 |
ret = posix_acl_create_masq(clone, mode); |
fed0b588b posix_acl: fix re... |
635 |
if (ret < 0) |
beaf226b8 posix_acl: don't ... |
636 |
goto err_release_clone; |
37bc15392 fs: make posix_ac... |
637 |
|
c0c3a718e fs/posix_acl.c: m... |
638 639 640 641 |
if (ret == 0) posix_acl_release(clone); else *acl = clone; |
37bc15392 fs: make posix_ac... |
642 |
|
c0c3a718e fs/posix_acl.c: m... |
643 |
if (!S_ISDIR(*mode)) |
37bc15392 fs: make posix_ac... |
644 |
posix_acl_release(p); |
c0c3a718e fs/posix_acl.c: m... |
645 |
else |
37bc15392 fs: make posix_ac... |
646 |
*default_acl = p; |
37bc15392 fs: make posix_ac... |
647 |
|
37bc15392 fs: make posix_ac... |
648 |
return 0; |
fed0b588b posix_acl: fix re... |
649 |
|
beaf226b8 posix_acl: don't ... |
650 |
err_release_clone: |
c0c3a718e fs/posix_acl.c: m... |
651 |
posix_acl_release(clone); |
beaf226b8 posix_acl: don't ... |
652 |
err_release: |
fed0b588b posix_acl: fix re... |
653 |
posix_acl_release(p); |
beaf226b8 posix_acl: don't ... |
654 |
return ret; |
37bc15392 fs: make posix_ac... |
655 656 |
} EXPORT_SYMBOL_GPL(posix_acl_create); |
073931017 posix_acl: Clear ... |
657 658 |
/** * posix_acl_update_mode - update mode in set_acl |
e65ce2a50 acl: handle idmap... |
659 660 661 662 |
* @mnt_userns: user namespace of the mount @inode was found from * @inode: target inode * @mode_p: mode (pointer) for update * @acl: acl pointer |
073931017 posix_acl: Clear ... |
663 664 665 |
* * Update the file mode when setting an ACL: compute the new file permission * bits based on the ACL. In addition, if the ACL is equivalent to the new |
e39e773ad fs/posix_acl.c: f... |
666 |
* file mode, set *@acl to NULL to indicate that no ACL should be set. |
073931017 posix_acl: Clear ... |
667 |
* |
e39e773ad fs/posix_acl.c: f... |
668 |
* As with chmod, clear the setgid bit if the caller is not in the owning group |
073931017 posix_acl: Clear ... |
669 670 |
* or capable of CAP_FSETID (see inode_change_ok). * |
e65ce2a50 acl: handle idmap... |
671 672 673 674 675 676 |
* If the inode has been found through an idmapped mount the user namespace of * the vfsmount must be passed through @mnt_userns. This function will then * take care to map the inode according to @mnt_userns before checking * permissions. On non-idmapped mounts or if permission checking is to be * performed on the raw inode simply passs init_user_ns. * |
073931017 posix_acl: Clear ... |
677 678 |
* Called from set_acl inode operations. */ |
e65ce2a50 acl: handle idmap... |
679 680 |
int posix_acl_update_mode(struct user_namespace *mnt_userns, struct inode *inode, umode_t *mode_p, |
073931017 posix_acl: Clear ... |
681 682 683 684 685 686 687 688 689 690 |
struct posix_acl **acl) { umode_t mode = inode->i_mode; int error; error = posix_acl_equiv_mode(*acl, &mode); if (error < 0) return error; if (error == 0) *acl = NULL; |
e65ce2a50 acl: handle idmap... |
691 692 |
if (!in_group_p(i_gid_into_mnt(mnt_userns, inode)) && !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID)) |
073931017 posix_acl: Clear ... |
693 694 695 696 697 |
mode &= ~S_ISGID; *mode_p = mode; return 0; } EXPORT_SYMBOL(posix_acl_update_mode); |
5c8ebd57b fs: merge xattr_a... |
698 699 700 701 702 |
/* * Fix up the uids and gids in posix acl extended attributes in place. */ static void posix_acl_fix_xattr_userns( struct user_namespace *to, struct user_namespace *from, |
e65ce2a50 acl: handle idmap... |
703 704 |
struct user_namespace *mnt_userns, void *value, size_t size, bool from_user) |
5c8ebd57b fs: merge xattr_a... |
705 |
{ |
2211d5ba5 posix_acl: xattr ... |
706 707 |
struct posix_acl_xattr_header *header = value; struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end; |
5c8ebd57b fs: merge xattr_a... |
708 709 710 711 712 713 |
int count; kuid_t uid; kgid_t gid; if (!value) return; |
2211d5ba5 posix_acl: xattr ... |
714 |
if (size < sizeof(struct posix_acl_xattr_header)) |
5c8ebd57b fs: merge xattr_a... |
715 716 717 718 719 720 721 722 723 724 725 726 727 728 |
return; if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) return; count = posix_acl_xattr_count(size); if (count < 0) return; if (count == 0) return; for (end = entry + count; entry != end; entry++) { switch(le16_to_cpu(entry->e_tag)) { case ACL_USER: uid = make_kuid(from, le32_to_cpu(entry->e_id)); |
e65ce2a50 acl: handle idmap... |
729 |
if (from_user) |
f895d0ff4 fs: use low-level... |
730 |
uid = mapped_kuid_user(mnt_userns, &init_user_ns, uid); |
e65ce2a50 acl: handle idmap... |
731 |
else |
f895d0ff4 fs: use low-level... |
732 |
uid = mapped_kuid_fs(mnt_userns, &init_user_ns, uid); |
5c8ebd57b fs: merge xattr_a... |
733 734 735 736 |
entry->e_id = cpu_to_le32(from_kuid(to, uid)); break; case ACL_GROUP: gid = make_kgid(from, le32_to_cpu(entry->e_id)); |
e65ce2a50 acl: handle idmap... |
737 |
if (from_user) |
f895d0ff4 fs: use low-level... |
738 |
gid = mapped_kgid_user(mnt_userns, &init_user_ns, gid); |
e65ce2a50 acl: handle idmap... |
739 |
else |
f895d0ff4 fs: use low-level... |
740 |
gid = mapped_kgid_fs(mnt_userns, &init_user_ns, gid); |
5c8ebd57b fs: merge xattr_a... |
741 742 743 744 745 746 747 |
entry->e_id = cpu_to_le32(from_kgid(to, gid)); break; default: break; } } } |
e65ce2a50 acl: handle idmap... |
748 |
void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns, |
dc85bc24f fs: fix acl trans... |
749 |
struct inode *inode, |
e65ce2a50 acl: handle idmap... |
750 |
void *value, size_t size) |
5c8ebd57b fs: merge xattr_a... |
751 752 |
{ struct user_namespace *user_ns = current_user_ns(); |
dc85bc24f fs: fix acl trans... |
753 754 755 756 |
/* Leave ids untouched on non-idmapped mounts. */ if (no_idmapping(mnt_userns, i_user_ns(inode))) mnt_userns = &init_user_ns; |
e65ce2a50 acl: handle idmap... |
757 |
if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns)) |
5c8ebd57b fs: merge xattr_a... |
758 |
return; |
e65ce2a50 acl: handle idmap... |
759 760 |
posix_acl_fix_xattr_userns(&init_user_ns, user_ns, mnt_userns, value, size, true); |
5c8ebd57b fs: merge xattr_a... |
761 |
} |
e65ce2a50 acl: handle idmap... |
762 |
void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns, |
dc85bc24f fs: fix acl trans... |
763 |
struct inode *inode, |
e65ce2a50 acl: handle idmap... |
764 |
void *value, size_t size) |
5c8ebd57b fs: merge xattr_a... |
765 766 |
{ struct user_namespace *user_ns = current_user_ns(); |
dc85bc24f fs: fix acl trans... |
767 768 769 770 |
/* Leave ids untouched on non-idmapped mounts. */ if (no_idmapping(mnt_userns, i_user_ns(inode))) mnt_userns = &init_user_ns; |
e65ce2a50 acl: handle idmap... |
771 |
if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns)) |
5c8ebd57b fs: merge xattr_a... |
772 |
return; |
e65ce2a50 acl: handle idmap... |
773 774 |
posix_acl_fix_xattr_userns(user_ns, &init_user_ns, mnt_userns, value, size, false); |
5c8ebd57b fs: merge xattr_a... |
775 776 777 778 779 780 781 782 783 |
} /* * Convert from extended attribute to in-memory representation. */ struct posix_acl * posix_acl_from_xattr(struct user_namespace *user_ns, const void *value, size_t size) { |
2211d5ba5 posix_acl: xattr ... |
784 785 |
const struct posix_acl_xattr_header *header = value; const struct posix_acl_xattr_entry *entry = (const void *)(header + 1), *end; |
5c8ebd57b fs: merge xattr_a... |
786 787 788 789 790 791 |
int count; struct posix_acl *acl; struct posix_acl_entry *acl_e; if (!value) return NULL; |
2211d5ba5 posix_acl: xattr ... |
792 |
if (size < sizeof(struct posix_acl_xattr_header)) |
5c8ebd57b fs: merge xattr_a... |
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 |
return ERR_PTR(-EINVAL); if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) return ERR_PTR(-EOPNOTSUPP); count = posix_acl_xattr_count(size); if (count < 0) return ERR_PTR(-EINVAL); if (count == 0) return NULL; acl = posix_acl_alloc(count, GFP_NOFS); if (!acl) return ERR_PTR(-ENOMEM); acl_e = acl->a_entries; for (end = entry + count; entry != end; acl_e++, entry++) { acl_e->e_tag = le16_to_cpu(entry->e_tag); acl_e->e_perm = le16_to_cpu(entry->e_perm); switch(acl_e->e_tag) { case ACL_USER_OBJ: case ACL_GROUP_OBJ: case ACL_MASK: case ACL_OTHER: break; case ACL_USER: acl_e->e_uid = make_kuid(user_ns, le32_to_cpu(entry->e_id)); if (!uid_valid(acl_e->e_uid)) goto fail; break; case ACL_GROUP: acl_e->e_gid = make_kgid(user_ns, le32_to_cpu(entry->e_id)); if (!gid_valid(acl_e->e_gid)) goto fail; break; default: goto fail; } } return acl; fail: posix_acl_release(acl); return ERR_PTR(-EINVAL); } EXPORT_SYMBOL (posix_acl_from_xattr); /* * Convert from in-memory to extended attribute representation. */ int posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl, void *buffer, size_t size) { |
2211d5ba5 posix_acl: xattr ... |
853 854 |
struct posix_acl_xattr_header *ext_acl = buffer; struct posix_acl_xattr_entry *ext_entry; |
5c8ebd57b fs: merge xattr_a... |
855 856 857 858 859 860 861 |
int real_size, n; real_size = posix_acl_xattr_size(acl->a_count); if (!buffer) return real_size; if (real_size > size) return -ERANGE; |
47ba97344 fs: NULL derefere... |
862 |
|
2211d5ba5 posix_acl: xattr ... |
863 |
ext_entry = (void *)(ext_acl + 1); |
5c8ebd57b fs: merge xattr_a... |
864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 |
ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION); for (n=0; n < acl->a_count; n++, ext_entry++) { const struct posix_acl_entry *acl_e = &acl->a_entries[n]; ext_entry->e_tag = cpu_to_le16(acl_e->e_tag); ext_entry->e_perm = cpu_to_le16(acl_e->e_perm); switch(acl_e->e_tag) { case ACL_USER: ext_entry->e_id = cpu_to_le32(from_kuid(user_ns, acl_e->e_uid)); break; case ACL_GROUP: ext_entry->e_id = cpu_to_le32(from_kgid(user_ns, acl_e->e_gid)); break; default: ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); break; } } return real_size; } EXPORT_SYMBOL (posix_acl_to_xattr); |
2aeccbe95 fs: add generic x... |
887 888 |
static int |
d9a82a040 xattr handlers: P... |
889 |
posix_acl_xattr_get(const struct xattr_handler *handler, |
b296821a7 xattr_handler: pa... |
890 891 |
struct dentry *unused, struct inode *inode, const char *name, void *value, size_t size) |
2aeccbe95 fs: add generic x... |
892 893 894 |
{ struct posix_acl *acl; int error; |
b296821a7 xattr_handler: pa... |
895 |
if (!IS_POSIXACL(inode)) |
2aeccbe95 fs: add generic x... |
896 |
return -EOPNOTSUPP; |
b296821a7 xattr_handler: pa... |
897 |
if (S_ISLNK(inode->i_mode)) |
2aeccbe95 fs: add generic x... |
898 |
return -EOPNOTSUPP; |
b296821a7 xattr_handler: pa... |
899 |
acl = get_acl(inode, handler->flags); |
2aeccbe95 fs: add generic x... |
900 901 902 903 904 905 906 907 908 909 |
if (IS_ERR(acl)) return PTR_ERR(acl); if (acl == NULL) return -ENODATA; error = posix_acl_to_xattr(&init_user_ns, acl, value, size); posix_acl_release(acl); return error; } |
485e71e8f posix_acl: Add se... |
910 |
int |
e65ce2a50 acl: handle idmap... |
911 912 |
set_posix_acl(struct user_namespace *mnt_userns, struct inode *inode, int type, struct posix_acl *acl) |
2aeccbe95 fs: add generic x... |
913 |
{ |
2aeccbe95 fs: add generic x... |
914 915 916 917 |
if (!IS_POSIXACL(inode)) return -EOPNOTSUPP; if (!inode->i_op->set_acl) return -EOPNOTSUPP; |
485e71e8f posix_acl: Add se... |
918 919 |
if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) return acl ? -EACCES : 0; |
e65ce2a50 acl: handle idmap... |
920 |
if (!inode_owner_or_capable(mnt_userns, inode)) |
2aeccbe95 fs: add generic x... |
921 |
return -EPERM; |
485e71e8f posix_acl: Add se... |
922 |
if (acl) { |
a867d7349 Merge branch 'for... |
923 |
int ret = posix_acl_valid(inode->i_sb->s_user_ns, acl); |
485e71e8f posix_acl: Add se... |
924 925 926 |
if (ret) return ret; } |
549c72977 fs: make helpers ... |
927 |
return inode->i_op->set_acl(mnt_userns, inode, acl, type); |
485e71e8f posix_acl: Add se... |
928 929 930 931 932 |
} EXPORT_SYMBOL(set_posix_acl); static int posix_acl_xattr_set(const struct xattr_handler *handler, |
e65ce2a50 acl: handle idmap... |
933 934 935 936 |
struct user_namespace *mnt_userns, struct dentry *unused, struct inode *inode, const char *name, const void *value, size_t size, int flags) |
485e71e8f posix_acl: Add se... |
937 938 939 |
{ struct posix_acl *acl = NULL; int ret; |
2aeccbe95 fs: add generic x... |
940 941 942 943 |
if (value) { acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); |
2aeccbe95 fs: add generic x... |
944 |
} |
e65ce2a50 acl: handle idmap... |
945 |
ret = set_posix_acl(mnt_userns, inode, handler->flags, acl); |
2aeccbe95 fs: add generic x... |
946 947 948 |
posix_acl_release(acl); return ret; } |
764a5c6b1 xattr handlers: S... |
949 950 |
static bool posix_acl_xattr_list(struct dentry *dentry) |
2aeccbe95 fs: add generic x... |
951 |
{ |
764a5c6b1 xattr handlers: S... |
952 |
return IS_POSIXACL(d_backing_inode(dentry)); |
2aeccbe95 fs: add generic x... |
953 954 955 |
} const struct xattr_handler posix_acl_access_xattr_handler = { |
98e9cb571 vfs: Distinguish ... |
956 |
.name = XATTR_NAME_POSIX_ACL_ACCESS, |
2aeccbe95 fs: add generic x... |
957 958 959 960 961 962 963 964 |
.flags = ACL_TYPE_ACCESS, .list = posix_acl_xattr_list, .get = posix_acl_xattr_get, .set = posix_acl_xattr_set, }; EXPORT_SYMBOL_GPL(posix_acl_access_xattr_handler); const struct xattr_handler posix_acl_default_xattr_handler = { |
98e9cb571 vfs: Distinguish ... |
965 |
.name = XATTR_NAME_POSIX_ACL_DEFAULT, |
2aeccbe95 fs: add generic x... |
966 967 968 969 970 971 |
.flags = ACL_TYPE_DEFAULT, .list = posix_acl_xattr_list, .get = posix_acl_xattr_get, .set = posix_acl_xattr_set, }; EXPORT_SYMBOL_GPL(posix_acl_default_xattr_handler); |
feda821e7 fs: remove generi... |
972 |
|
549c72977 fs: make helpers ... |
973 974 |
int simple_set_acl(struct user_namespace *mnt_userns, struct inode *inode, struct posix_acl *acl, int type) |
feda821e7 fs: remove generi... |
975 976 977 978 |
{ int error; if (type == ACL_TYPE_ACCESS) { |
549c72977 fs: make helpers ... |
979 |
error = posix_acl_update_mode(mnt_userns, inode, |
497de07d8 tmpfs: clear S_IS... |
980 981 982 |
&inode->i_mode, &acl); if (error) return error; |
feda821e7 fs: remove generi... |
983 |
} |
078cd8279 fs: Replace CURRE... |
984 |
inode->i_ctime = current_time(inode); |
feda821e7 fs: remove generi... |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 |
set_cached_acl(inode, type, acl); return 0; } int simple_acl_create(struct inode *dir, struct inode *inode) { struct posix_acl *default_acl, *acl; int error; error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); if (error) return error; set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl); set_cached_acl(inode, ACL_TYPE_ACCESS, acl); if (default_acl) posix_acl_release(default_acl); if (acl) posix_acl_release(acl); return 0; } |