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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 <[email protected]>
Reviewed-by: James Morris <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Andreas Gruenbacher 2015-12-02 14:44:36 +01:00 • committed by Al Viro
commit 98e9cb5711
22 changed files with 47 additions and 130 deletions
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12
fs/hfsplus/xattr.c
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@ -431,9 +431,6 @@ int hfsplus_setxattr(struct dentry *dentry, const char *name,
char *xattr_name;
int res;
if (!strcmp(name, ""))
return -EINVAL;
xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
GFP_KERNEL);
if (!xattr_name)
@ -589,9 +586,6 @@ ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
int res;
char *xattr_name;
if (!strcmp(name, ""))
return -EINVAL;
xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
GFP_KERNEL);
if (!xattr_name)
@ -853,9 +847,6 @@ static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
void *buffer, size_t size)
{
if (!strcmp(name, ""))
return -EINVAL;
/*
* Don't allow retrieving properly prefixed attributes
* by prepending them with "osx."
@ -876,9 +867,6 @@ static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *buffer, size_t size, int flags)
{
if (!strcmp(name, ""))
return -EINVAL;
/*
* Don't allow setting properly prefixed attributes
* by prepending them with "osx."