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fs/xattr.c
23.5 KB
1da177e4c Linux-2.6.12-rc2 |
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/* File: fs/xattr.c Extended attribute handling. Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org> Copyright (C) 2001 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com> Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> */ #include <linux/fs.h> #include <linux/slab.h> |
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#include <linux/file.h> #include <linux/xattr.h> |
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#include <linux/mount.h> |
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#include <linux/namei.h> #include <linux/security.h> |
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#include <linux/evm.h> |
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#include <linux/syscalls.h> |
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#include <linux/export.h> |
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#include <linux/fsnotify.h> |
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#include <linux/audit.h> |
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#include <linux/vmalloc.h> |
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#include <linux/posix_acl_xattr.h> |
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|
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#include <asm/uaccess.h> |
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|
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static const char * strcmp_prefix(const char *a, const char *a_prefix) { while (*a_prefix && *a == *a_prefix) { a++; a_prefix++; } return *a_prefix ? NULL : a; } /* * In order to implement different sets of xattr operations for each xattr |
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* prefix, a filesystem should create a null-terminated array of struct * xattr_handler (one for each prefix) and hang a pointer to it off of the * s_xattr field of the superblock. |
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*/ #define for_each_xattr_handler(handlers, handler) \ if (handlers) \ for ((handler) = *(handlers)++; \ (handler) != NULL; \ (handler) = *(handlers)++) /* * Find the xattr_handler with the matching prefix. */ static const struct xattr_handler * |
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xattr_resolve_name(struct inode *inode, const char **name) |
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{ |
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const struct xattr_handler **handlers = inode->i_sb->s_xattr; |
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const struct xattr_handler *handler; |
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if (!(inode->i_opflags & IOP_XATTR)) { if (unlikely(is_bad_inode(inode))) return ERR_PTR(-EIO); |
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return ERR_PTR(-EOPNOTSUPP); |
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} |
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for_each_xattr_handler(handlers, handler) { const char *n; n = strcmp_prefix(*name, xattr_prefix(handler)); if (n) { if (!handler->prefix ^ !*n) { if (*n) continue; return ERR_PTR(-EINVAL); } *name = n; return handler; } } return ERR_PTR(-EOPNOTSUPP); } |
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/* * Check permissions for extended attribute access. This is a bit complicated * because different namespaces have very different rules. */ static int xattr_permission(struct inode *inode, const char *name, int mask) { /* * We can never set or remove an extended attribute on a read-only * filesystem or on an immutable / append-only inode. */ if (mask & MAY_WRITE) { |
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if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) return -EPERM; |
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/* * Updating an xattr will likely cause i_uid and i_gid * to be writen back improperly if their true value is * unknown to the vfs. */ if (HAS_UNMAPPED_ID(inode)) return -EPERM; |
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} /* * No restriction for security.* and system.* from the VFS. Decision * on these is left to the underlying filesystem / security module. */ if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return 0; /* |
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* The trusted.* namespace can only be accessed by privileged users. |
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*/ |
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if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) { if (!capable(CAP_SYS_ADMIN)) return (mask & MAY_WRITE) ? -EPERM : -ENODATA; return 0; } |
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|
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/* * In the user.* namespace, only regular files and directories can have |
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* extended attributes. For sticky directories, only the owner and |
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* privileged users can write attributes. |
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*/ |
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if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) { |
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if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) |
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return (mask & MAY_WRITE) ? -EPERM : -ENODATA; |
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if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) && |
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(mask & MAY_WRITE) && !inode_owner_or_capable(inode)) |
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return -EPERM; } |
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return inode_permission(inode, mask); |
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} |
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int __vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name, const void *value, size_t size, int flags) { |
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const struct xattr_handler *handler; handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); if (!handler->set) |
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return -EOPNOTSUPP; |
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if (size == 0) value = ""; /* empty EA, do not remove */ return handler->set(handler, dentry, inode, name, value, size, flags); |
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} EXPORT_SYMBOL(__vfs_setxattr); |
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/** * __vfs_setxattr_noperm - perform setxattr operation without performing * permission checks. * * @dentry - object to perform setxattr on * @name - xattr name to set * @value - value to set @name to * @size - size of @value * @flags - flags to pass into filesystem operations * * returns the result of the internal setxattr or setsecurity operations. * * This function requires the caller to lock the inode's i_mutex before it * is executed. It also assumes that the caller will make the appropriate * permission checks. */ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) |
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{ struct inode *inode = dentry->d_inode; |
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int error = -EAGAIN; |
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int issec = !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); |
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|
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if (issec) inode->i_flags &= ~S_NOSEC; |
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if (inode->i_opflags & IOP_XATTR) { |
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error = __vfs_setxattr(dentry, inode, name, value, size, flags); |
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if (!error) { fsnotify_xattr(dentry); security_inode_post_setxattr(dentry, name, value, size, flags); } |
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} else { |
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if (unlikely(is_bad_inode(inode))) return -EIO; |
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} if (error == -EAGAIN) { error = -EOPNOTSUPP; if (issec) { const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; error = security_inode_setsecurity(inode, suffix, value, size, flags); if (!error) fsnotify_xattr(dentry); } |
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} |
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return error; } int vfs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { struct inode *inode = dentry->d_inode; int error; error = xattr_permission(inode, name, MAY_WRITE); if (error) return error; |
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inode_lock(inode); |
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error = security_inode_setxattr(dentry, name, value, size, flags); if (error) goto out; error = __vfs_setxattr_noperm(dentry, name, value, size, flags); |
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out: |
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inode_unlock(inode); |
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return error; } EXPORT_SYMBOL_GPL(vfs_setxattr); ssize_t |
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xattr_getsecurity(struct inode *inode, const char *name, void *value, size_t size) { void *buffer = NULL; ssize_t len; if (!value || !size) { len = security_inode_getsecurity(inode, name, &buffer, false); goto out_noalloc; } len = security_inode_getsecurity(inode, name, &buffer, true); if (len < 0) return len; if (size < len) { len = -ERANGE; goto out; } memcpy(value, buffer, len); out: security_release_secctx(buffer, len); out_noalloc: return len; } EXPORT_SYMBOL_GPL(xattr_getsecurity); |
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/* * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr * * Allocate memory, if not already allocated, or re-allocate correct size, * before retrieving the extended attribute. * * Returns the result of alloc, if failed, or the getxattr operation. */ ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value, size_t xattr_size, gfp_t flags) { |
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const struct xattr_handler *handler; |
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struct inode *inode = dentry->d_inode; char *value = *xattr_value; int error; error = xattr_permission(inode, name, MAY_READ); if (error) return error; |
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handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); if (!handler->get) |
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return -EOPNOTSUPP; |
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error = handler->get(handler, dentry, inode, name, NULL, 0); |
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if (error < 0) return error; if (!value || (error > xattr_size)) { value = krealloc(*xattr_value, error + 1, flags); if (!value) return -ENOMEM; memset(value, 0, error + 1); } |
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error = handler->get(handler, dentry, inode, name, value, error); |
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*xattr_value = value; return error; } |
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ssize_t |
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__vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name, void *value, size_t size) { |
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const struct xattr_handler *handler; handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); if (!handler->get) |
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return -EOPNOTSUPP; |
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return handler->get(handler, dentry, inode, name, value, size); |
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} EXPORT_SYMBOL(__vfs_getxattr); ssize_t |
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vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) |
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{ struct inode *inode = dentry->d_inode; int error; |
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error = xattr_permission(inode, name, MAY_READ); if (error) return error; |
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error = security_inode_getxattr(dentry, name); if (error) return error; |
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if (!strncmp(name, XATTR_SECURITY_PREFIX, |
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XATTR_SECURITY_PREFIX_LEN)) { const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; |
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int ret = xattr_getsecurity(inode, suffix, value, size); |
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/* * Only overwrite the return value if a security module * is actually active. */ |
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if (ret == -EOPNOTSUPP) goto nolsm; return ret; |
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} |
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nolsm: |
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return __vfs_getxattr(dentry, inode, name, value, size); |
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} EXPORT_SYMBOL_GPL(vfs_getxattr); |
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ssize_t |
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vfs_listxattr(struct dentry *dentry, char *list, size_t size) |
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{ |
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struct inode *inode = d_inode(dentry); |
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ssize_t error; |
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error = security_inode_listxattr(dentry); |
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if (error) return error; |
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if (inode->i_op->listxattr && (inode->i_opflags & IOP_XATTR)) { error = -EOPNOTSUPP; error = inode->i_op->listxattr(dentry, list, size); |
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} else { |
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error = security_inode_listsecurity(inode, list, size); |
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if (size && error > size) error = -ERANGE; } return error; } EXPORT_SYMBOL_GPL(vfs_listxattr); |
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int |
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__vfs_removexattr(struct dentry *dentry, const char *name) |
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{ |
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struct inode *inode = d_inode(dentry); const struct xattr_handler *handler; |
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|
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handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); if (!handler->set) |
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return -EOPNOTSUPP; |
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return handler->set(handler, dentry, inode, name, NULL, 0, XATTR_REPLACE); |
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} EXPORT_SYMBOL(__vfs_removexattr); int vfs_removexattr(struct dentry *dentry, const char *name) { struct inode *inode = dentry->d_inode; int error; |
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|
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error = xattr_permission(inode, name, MAY_WRITE); if (error) return error; |
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inode_lock(inode); |
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error = security_inode_removexattr(dentry, name); |
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if (error) goto out; |
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|
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error = __vfs_removexattr(dentry, name); |
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|
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if (!error) { |
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fsnotify_xattr(dentry); |
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evm_inode_post_removexattr(dentry, name); } |
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out: |
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inode_unlock(inode); |
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return error; } EXPORT_SYMBOL_GPL(vfs_removexattr); |
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/* * Extended attribute SET operations */ static long |
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setxattr(struct dentry *d, const char __user *name, const void __user *value, |
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size_t size, int flags) { int error; void *kvalue = NULL; char kname[XATTR_NAME_MAX + 1]; if (flags & ~(XATTR_CREATE|XATTR_REPLACE)) return -EINVAL; error = strncpy_from_user(kname, name, sizeof(kname)); if (error == 0 || error == sizeof(kname)) error = -ERANGE; if (error < 0) return error; if (size) { if (size > XATTR_SIZE_MAX) return -E2BIG; |
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kvalue = kmalloc(size, GFP_KERNEL | __GFP_NOWARN); if (!kvalue) { |
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kvalue = vmalloc(size); if (!kvalue) |
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return -ENOMEM; |
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} if (copy_from_user(kvalue, value, size)) { error = -EFAULT; goto out; } |
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if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) posix_acl_fix_xattr_from_user(kvalue, size); |
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} |
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error = vfs_setxattr(d, kname, kvalue, size, flags); |
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out: |
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kvfree(kvalue); |
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return error; } |
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static int path_setxattr(const char __user *pathname, const char __user *name, const void __user *value, size_t size, int flags, unsigned int lookup_flags) |
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{ |
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struct path path; |
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int error; |
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retry: error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
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if (error) return error; |
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error = mnt_want_write(path.mnt); |
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if (!error) { |
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error = setxattr(path.dentry, name, value, size, flags); mnt_drop_write(path.mnt); |
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} |
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path_put(&path); |
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if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } |
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return error; } |
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SYSCALL_DEFINE5(setxattr, const char __user *, pathname, const char __user *, name, const void __user *, value, size_t, size, int, flags) { return path_setxattr(pathname, name, value, size, flags, LOOKUP_FOLLOW); } |
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SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname, const char __user *, name, const void __user *, value, size_t, size, int, flags) |
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{ |
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return path_setxattr(pathname, name, value, size, flags, 0); |
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} |
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SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name, const void __user *,value, size_t, size, int, flags) |
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{ |
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struct fd f = fdget(fd); |
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int error = -EBADF; |
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472 |
if (!f.file) |
1da177e4c Linux-2.6.12-rc2 |
473 |
return error; |
9f45f5bf3 new helper: audit... |
474 |
audit_file(f.file); |
2903ff019 switch simple cas... |
475 |
error = mnt_want_write_file(f.file); |
18f335aff [PATCH] r/o bind ... |
476 |
if (!error) { |
9f45f5bf3 new helper: audit... |
477 |
error = setxattr(f.file->f_path.dentry, name, value, size, flags); |
2903ff019 switch simple cas... |
478 |
mnt_drop_write_file(f.file); |
18f335aff [PATCH] r/o bind ... |
479 |
} |
2903ff019 switch simple cas... |
480 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
481 482 483 484 485 486 487 |
return error; } /* * Extended attribute GET operations */ static ssize_t |
8f0cfa52a xattr: add missin... |
488 489 |
getxattr(struct dentry *d, const char __user *name, void __user *value, size_t size) |
1da177e4c Linux-2.6.12-rc2 |
490 491 492 493 494 495 496 497 498 499 500 501 502 503 |
{ ssize_t error; void *kvalue = NULL; char kname[XATTR_NAME_MAX + 1]; error = strncpy_from_user(kname, name, sizeof(kname)); if (error == 0 || error == sizeof(kname)) error = -ERANGE; if (error < 0) return error; if (size) { if (size > XATTR_SIZE_MAX) size = XATTR_SIZE_MAX; |
779302e67 fs/xattr.c:getxat... |
504 505 |
kvalue = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); if (!kvalue) { |
0b2a6f231 fs: xattr: Use kv... |
506 507 |
kvalue = vmalloc(size); if (!kvalue) |
779302e67 fs/xattr.c:getxat... |
508 |
return -ENOMEM; |
779302e67 fs/xattr.c:getxat... |
509 |
} |
1da177e4c Linux-2.6.12-rc2 |
510 |
} |
5be196e5f [PATCH] add vfs_*... |
511 |
error = vfs_getxattr(d, kname, kvalue, size); |
f549d6c18 [PATCH] Generic V... |
512 |
if (error > 0) { |
2f6f0654a userns: Convert v... |
513 514 515 |
if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) posix_acl_fix_xattr_to_user(kvalue, size); |
f549d6c18 [PATCH] Generic V... |
516 517 518 519 520 521 |
if (size && copy_to_user(value, kvalue, error)) error = -EFAULT; } else if (error == -ERANGE && size >= XATTR_SIZE_MAX) { /* The file system tried to returned a value bigger than XATTR_SIZE_MAX bytes. Not possible. */ error = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
522 |
} |
0b2a6f231 fs: xattr: Use kv... |
523 524 |
kvfree(kvalue); |
1da177e4c Linux-2.6.12-rc2 |
525 526 |
return error; } |
8cc431165 vfs: Deduplicate ... |
527 528 529 |
static ssize_t path_getxattr(const char __user *pathname, const char __user *name, void __user *value, size_t size, unsigned int lookup_flags) |
1da177e4c Linux-2.6.12-rc2 |
530 |
{ |
2d8f30380 [PATCH] sanitize ... |
531 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
532 |
ssize_t error; |
60e66b48c vfs: make getxatt... |
533 534 |
retry: error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
1da177e4c Linux-2.6.12-rc2 |
535 536 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
537 538 |
error = getxattr(path.dentry, name, value, size); path_put(&path); |
60e66b48c vfs: make getxatt... |
539 540 541 542 |
if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } |
1da177e4c Linux-2.6.12-rc2 |
543 544 |
return error; } |
8cc431165 vfs: Deduplicate ... |
545 546 547 548 549 |
SYSCALL_DEFINE4(getxattr, const char __user *, pathname, const char __user *, name, void __user *, value, size_t, size) { return path_getxattr(pathname, name, value, size, LOOKUP_FOLLOW); } |
64fd1de3d [CVE-2009-0029] S... |
550 551 |
SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname, const char __user *, name, void __user *, value, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
552 |
{ |
8cc431165 vfs: Deduplicate ... |
553 |
return path_getxattr(pathname, name, value, size, 0); |
1da177e4c Linux-2.6.12-rc2 |
554 |
} |
64fd1de3d [CVE-2009-0029] S... |
555 556 |
SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name, void __user *, value, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
557 |
{ |
2903ff019 switch simple cas... |
558 |
struct fd f = fdget(fd); |
1da177e4c Linux-2.6.12-rc2 |
559 |
ssize_t error = -EBADF; |
2903ff019 switch simple cas... |
560 |
if (!f.file) |
1da177e4c Linux-2.6.12-rc2 |
561 |
return error; |
9f45f5bf3 new helper: audit... |
562 |
audit_file(f.file); |
2903ff019 switch simple cas... |
563 564 |
error = getxattr(f.file->f_path.dentry, name, value, size); fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 |
return error; } /* * Extended attribute LIST operations */ static ssize_t listxattr(struct dentry *d, char __user *list, size_t size) { ssize_t error; char *klist = NULL; if (size) { if (size > XATTR_LIST_MAX) size = XATTR_LIST_MAX; |
703bf2d12 fs/xattr.c: suppr... |
580 |
klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL); |
0d08d7b7e fs/xattr.c:listxa... |
581 |
if (!klist) { |
0b2a6f231 fs: xattr: Use kv... |
582 583 |
klist = vmalloc(size); if (!klist) |
0d08d7b7e fs/xattr.c:listxa... |
584 |
return -ENOMEM; |
0d08d7b7e fs/xattr.c:listxa... |
585 |
} |
1da177e4c Linux-2.6.12-rc2 |
586 |
} |
659564c8a [PATCH] Introduce... |
587 |
error = vfs_listxattr(d, klist, size); |
f549d6c18 [PATCH] Generic V... |
588 589 590 591 592 593 594 |
if (error > 0) { if (size && copy_to_user(list, klist, error)) error = -EFAULT; } else if (error == -ERANGE && size >= XATTR_LIST_MAX) { /* The file system tried to returned a list bigger than XATTR_LIST_MAX bytes. Not possible. */ error = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
595 |
} |
0b2a6f231 fs: xattr: Use kv... |
596 597 |
kvfree(klist); |
1da177e4c Linux-2.6.12-rc2 |
598 599 |
return error; } |
8cc431165 vfs: Deduplicate ... |
600 601 |
static ssize_t path_listxattr(const char __user *pathname, char __user *list, size_t size, unsigned int lookup_flags) |
1da177e4c Linux-2.6.12-rc2 |
602 |
{ |
2d8f30380 [PATCH] sanitize ... |
603 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
604 |
ssize_t error; |
10a90cf36 vfs: make listxat... |
605 606 |
retry: error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
1da177e4c Linux-2.6.12-rc2 |
607 608 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
609 610 |
error = listxattr(path.dentry, list, size); path_put(&path); |
10a90cf36 vfs: make listxat... |
611 612 613 614 |
if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } |
1da177e4c Linux-2.6.12-rc2 |
615 616 |
return error; } |
8cc431165 vfs: Deduplicate ... |
617 618 619 620 621 |
SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list, size_t, size) { return path_listxattr(pathname, list, size, LOOKUP_FOLLOW); } |
64fd1de3d [CVE-2009-0029] S... |
622 623 |
SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
624 |
{ |
8cc431165 vfs: Deduplicate ... |
625 |
return path_listxattr(pathname, list, size, 0); |
1da177e4c Linux-2.6.12-rc2 |
626 |
} |
64fd1de3d [CVE-2009-0029] S... |
627 |
SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
628 |
{ |
2903ff019 switch simple cas... |
629 |
struct fd f = fdget(fd); |
1da177e4c Linux-2.6.12-rc2 |
630 |
ssize_t error = -EBADF; |
2903ff019 switch simple cas... |
631 |
if (!f.file) |
1da177e4c Linux-2.6.12-rc2 |
632 |
return error; |
9f45f5bf3 new helper: audit... |
633 |
audit_file(f.file); |
2903ff019 switch simple cas... |
634 635 |
error = listxattr(f.file->f_path.dentry, list, size); fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
636 637 638 639 640 641 642 |
return error; } /* * Extended attribute REMOVE operations */ static long |
8f0cfa52a xattr: add missin... |
643 |
removexattr(struct dentry *d, const char __user *name) |
1da177e4c Linux-2.6.12-rc2 |
644 645 646 647 648 649 650 651 652 |
{ int error; char kname[XATTR_NAME_MAX + 1]; error = strncpy_from_user(kname, name, sizeof(kname)); if (error == 0 || error == sizeof(kname)) error = -ERANGE; if (error < 0) return error; |
5be196e5f [PATCH] add vfs_*... |
653 |
return vfs_removexattr(d, kname); |
1da177e4c Linux-2.6.12-rc2 |
654 |
} |
8cc431165 vfs: Deduplicate ... |
655 656 |
static int path_removexattr(const char __user *pathname, const char __user *name, unsigned int lookup_flags) |
1da177e4c Linux-2.6.12-rc2 |
657 |
{ |
2d8f30380 [PATCH] sanitize ... |
658 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
659 |
int error; |
12f062129 vfs: make removex... |
660 661 |
retry: error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
1da177e4c Linux-2.6.12-rc2 |
662 663 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
664 |
error = mnt_want_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
665 |
if (!error) { |
2d8f30380 [PATCH] sanitize ... |
666 667 |
error = removexattr(path.dentry, name); mnt_drop_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
668 |
} |
2d8f30380 [PATCH] sanitize ... |
669 |
path_put(&path); |
12f062129 vfs: make removex... |
670 671 672 673 |
if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } |
1da177e4c Linux-2.6.12-rc2 |
674 675 |
return error; } |
8cc431165 vfs: Deduplicate ... |
676 677 678 679 680 |
SYSCALL_DEFINE2(removexattr, const char __user *, pathname, const char __user *, name) { return path_removexattr(pathname, name, LOOKUP_FOLLOW); } |
6a6160a7b [CVE-2009-0029] S... |
681 682 |
SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname, const char __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
683 |
{ |
8cc431165 vfs: Deduplicate ... |
684 |
return path_removexattr(pathname, name, 0); |
1da177e4c Linux-2.6.12-rc2 |
685 |
} |
6a6160a7b [CVE-2009-0029] S... |
686 |
SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
687 |
{ |
2903ff019 switch simple cas... |
688 |
struct fd f = fdget(fd); |
1da177e4c Linux-2.6.12-rc2 |
689 |
int error = -EBADF; |
2903ff019 switch simple cas... |
690 |
if (!f.file) |
1da177e4c Linux-2.6.12-rc2 |
691 |
return error; |
9f45f5bf3 new helper: audit... |
692 |
audit_file(f.file); |
2903ff019 switch simple cas... |
693 |
error = mnt_want_write_file(f.file); |
18f335aff [PATCH] r/o bind ... |
694 |
if (!error) { |
9f45f5bf3 new helper: audit... |
695 |
error = removexattr(f.file->f_path.dentry, name); |
2903ff019 switch simple cas... |
696 |
mnt_drop_write_file(f.file); |
18f335aff [PATCH] r/o bind ... |
697 |
} |
2903ff019 switch simple cas... |
698 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
699 700 |
return error; } |
1da177e4c Linux-2.6.12-rc2 |
701 |
/* |
1da177e4c Linux-2.6.12-rc2 |
702 703 704 705 706 707 |
* Combine the results of the list() operation from every xattr_handler in the * list. */ ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) { |
bb4354538 fs: xattr_handler... |
708 |
const struct xattr_handler *handler, **handlers = dentry->d_sb->s_xattr; |
1da177e4c Linux-2.6.12-rc2 |
709 710 711 |
unsigned int size = 0; if (!buffer) { |
431547b3c sanitize xattr ha... |
712 |
for_each_xattr_handler(handlers, handler) { |
764a5c6b1 xattr handlers: S... |
713 714 |
if (!handler->name || (handler->list && !handler->list(dentry))) |
c4803c497 nfs: Move call to... |
715 |
continue; |
764a5c6b1 xattr handlers: S... |
716 |
size += strlen(handler->name) + 1; |
431547b3c sanitize xattr ha... |
717 |
} |
1da177e4c Linux-2.6.12-rc2 |
718 719 |
} else { char *buf = buffer; |
764a5c6b1 xattr handlers: S... |
720 |
size_t len; |
1da177e4c Linux-2.6.12-rc2 |
721 722 |
for_each_xattr_handler(handlers, handler) { |
764a5c6b1 xattr handlers: S... |
723 724 |
if (!handler->name || (handler->list && !handler->list(dentry))) |
c4803c497 nfs: Move call to... |
725 |
continue; |
764a5c6b1 xattr handlers: S... |
726 727 |
len = strlen(handler->name); if (len + 1 > buffer_size) |
1da177e4c Linux-2.6.12-rc2 |
728 |
return -ERANGE; |
764a5c6b1 xattr handlers: S... |
729 730 731 |
memcpy(buf, handler->name, len + 1); buf += len + 1; buffer_size -= len + 1; |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 735 736 |
} size = buf - buffer; } return size; } |
1da177e4c Linux-2.6.12-rc2 |
737 |
EXPORT_SYMBOL(generic_listxattr); |
38f386574 xattr: extract si... |
738 |
|
e409de992 9p: xattr simplif... |
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 |
/** * xattr_full_name - Compute full attribute name from suffix * * @handler: handler of the xattr_handler operation * @name: name passed to the xattr_handler operation * * The get and set xattr handler operations are called with the remainder of * the attribute name after skipping the handler's prefix: for example, "foo" * is passed to the get operation of a handler with prefix "user." to get * attribute "user.foo". The full name is still "there" in the name though. * * Note: the list xattr handler operation when called from the vfs is passed a * NULL name; some file systems use this operation internally, with varying * semantics. */ const char *xattr_full_name(const struct xattr_handler *handler, const char *name) { |
98e9cb571 vfs: Distinguish ... |
757 |
size_t prefix_len = strlen(xattr_prefix(handler)); |
e409de992 9p: xattr simplif... |
758 759 760 761 |
return name - prefix_len; } EXPORT_SYMBOL(xattr_full_name); |
38f386574 xattr: extract si... |
762 763 764 765 766 767 768 769 770 771 |
/* * Allocate new xattr and copy in the value; but leave the name to callers. */ struct simple_xattr *simple_xattr_alloc(const void *value, size_t size) { struct simple_xattr *new_xattr; size_t len; /* wrap around? */ len = sizeof(*new_xattr) + size; |
4e66d445d simple_xattr: per... |
772 |
if (len < sizeof(*new_xattr)) |
38f386574 xattr: extract si... |
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 |
return NULL; new_xattr = kmalloc(len, GFP_KERNEL); if (!new_xattr) return NULL; new_xattr->size = size; memcpy(new_xattr->value, value, size); return new_xattr; } /* * xattr GET operation for in-memory/pseudo filesystems */ int simple_xattr_get(struct simple_xattrs *xattrs, const char *name, void *buffer, size_t size) { struct simple_xattr *xattr; int ret = -ENODATA; spin_lock(&xattrs->lock); list_for_each_entry(xattr, &xattrs->head, list) { if (strcmp(name, xattr->name)) continue; ret = xattr->size; if (buffer) { if (size < xattr->size) ret = -ERANGE; else memcpy(buffer, xattr->value, xattr->size); } break; } spin_unlock(&xattrs->lock); return ret; } |
aa7c5241c tmpfs: Use xattr ... |
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 |
/** * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems * @xattrs: target simple_xattr list * @name: name of the extended attribute * @value: value of the xattr. If %NULL, will remove the attribute. * @size: size of the new xattr * @flags: %XATTR_{CREATE|REPLACE} * * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist; * otherwise, fails with -ENODATA. * * Returns 0 on success, -errno on failure. */ int simple_xattr_set(struct simple_xattrs *xattrs, const char *name, const void *value, size_t size, int flags) |
38f386574 xattr: extract si... |
826 827 |
{ struct simple_xattr *xattr; |
433858469 fs, xattr: fix bu... |
828 |
struct simple_xattr *new_xattr = NULL; |
38f386574 xattr: extract si... |
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 |
int err = 0; /* value == NULL means remove */ if (value) { new_xattr = simple_xattr_alloc(value, size); if (!new_xattr) return -ENOMEM; new_xattr->name = kstrdup(name, GFP_KERNEL); if (!new_xattr->name) { kfree(new_xattr); return -ENOMEM; } } spin_lock(&xattrs->lock); list_for_each_entry(xattr, &xattrs->head, list) { if (!strcmp(name, xattr->name)) { if (flags & XATTR_CREATE) { xattr = new_xattr; err = -EEXIST; } else if (new_xattr) { list_replace(&xattr->list, &new_xattr->list); } else { list_del(&xattr->list); } goto out; } } if (flags & XATTR_REPLACE) { xattr = new_xattr; err = -ENODATA; } else { list_add(&new_xattr->list, &xattrs->head); xattr = NULL; } out: spin_unlock(&xattrs->lock); if (xattr) { kfree(xattr->name); kfree(xattr); } return err; } |
38f386574 xattr: extract si... |
874 875 876 877 |
static bool xattr_is_trusted(const char *name) { return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN); } |
786534b92 tmpfs: listxattr ... |
878 879 880 881 882 883 884 885 886 887 888 889 890 |
static int xattr_list_one(char **buffer, ssize_t *remaining_size, const char *name) { size_t len = strlen(name) + 1; if (*buffer) { if (*remaining_size < len) return -ERANGE; memcpy(*buffer, name, len); *buffer += len; } *remaining_size -= len; return 0; } |
38f386574 xattr: extract si... |
891 892 893 |
/* * xattr LIST operation for in-memory/pseudo filesystems */ |
786534b92 tmpfs: listxattr ... |
894 895 |
ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer, size_t size) |
38f386574 xattr: extract si... |
896 897 898 |
{ bool trusted = capable(CAP_SYS_ADMIN); struct simple_xattr *xattr; |
786534b92 tmpfs: listxattr ... |
899 |
ssize_t remaining_size = size; |
0e9a7da51 xattr handlers: p... |
900 |
int err = 0; |
786534b92 tmpfs: listxattr ... |
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 |
#ifdef CONFIG_FS_POSIX_ACL if (inode->i_acl) { err = xattr_list_one(&buffer, &remaining_size, XATTR_NAME_POSIX_ACL_ACCESS); if (err) return err; } if (inode->i_default_acl) { err = xattr_list_one(&buffer, &remaining_size, XATTR_NAME_POSIX_ACL_DEFAULT); if (err) return err; } #endif |
38f386574 xattr: extract si... |
916 917 918 |
spin_lock(&xattrs->lock); list_for_each_entry(xattr, &xattrs->head, list) { |
38f386574 xattr: extract si... |
919 920 921 |
/* skip "trusted." attributes for unprivileged callers */ if (!trusted && xattr_is_trusted(xattr->name)) continue; |
786534b92 tmpfs: listxattr ... |
922 923 |
err = xattr_list_one(&buffer, &remaining_size, xattr->name); if (err) |
0e9a7da51 xattr handlers: p... |
924 |
break; |
38f386574 xattr: extract si... |
925 926 |
} spin_unlock(&xattrs->lock); |
0e9a7da51 xattr handlers: p... |
927 |
return err ? err : size - remaining_size; |
38f386574 xattr: extract si... |
928 |
} |
4895768b6 fs: add missing d... |
929 930 931 |
/* * Adds an extended attribute to the list */ |
38f386574 xattr: extract si... |
932 933 934 935 936 937 938 |
void simple_xattr_list_add(struct simple_xattrs *xattrs, struct simple_xattr *new_xattr) { spin_lock(&xattrs->lock); list_add(&new_xattr->list, &xattrs->head); spin_unlock(&xattrs->lock); } |