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vfs: Distinguish between full xattr names and proper prefixes

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Add an additional "name" field to struct xattr_handler.  When the name
is set, the handler matches attributes with exactly that name.  When the
prefix is set instead, the handler matches attributes with the given
prefix and with a non-empty suffix.

This patch should avoid bugs like the one fixed in commit c361016a in
the future.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher
2015-12-02 14:44:36 +01:00
committed by Al Viro
parent 97d7929922
commit 98e9cb5711
22 changed files with 47 additions and 130 deletions
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11
include/linux/xattr.h
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@@ -19,7 +19,13 @@
struct inode;
struct dentry;
/*
* struct xattr_handler: When @name is set, match attributes with exactly that
* name. When @prefix is set instead, match attributes with that prefix and
* with a non-empty suffix.
*/
struct xattr_handler {
const char *name;
const char *prefix;
int flags; /* fs private flags */
size_t (*list)(const struct xattr_handler *, struct dentry *dentry,
@@ -54,6 +60,11 @@ int generic_removexattr(struct dentry *dentry, const char *name);
ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
char **xattr_value, size_t size, gfp_t flags);
static inline const char *xattr_prefix(const struct xattr_handler *handler)
{
return handler->prefix ?: handler->name;
}
struct simple_xattrs {
struct list_head head;
spinlock_t lock;