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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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16
fs/9p/acl.c
View file

@ -220,15 +220,12 @@ static int v9fs_xattr_get_acl(const struct xattr_handler *handler,
struct posix_acl *acl;
int error;
if (strcmp(name, "") != 0)
return -EINVAL;
v9ses = v9fs_dentry2v9ses(dentry);
/*
* We allow set/get/list of acl when access=client is not specified
*/
if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
return v9fs_xattr_get(dentry, handler->prefix, buffer, size);
return v9fs_xattr_get(dentry, handler->name, buffer, size);
acl = v9fs_get_cached_acl(d_inode(dentry), handler->flags);
if (IS_ERR(acl))
@ -250,16 +247,13 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
struct v9fs_session_info *v9ses;
struct inode *inode = d_inode(dentry);
if (strcmp(name, "") != 0)
return -EINVAL;
v9ses = v9fs_dentry2v9ses(dentry);
/*
* set the attribute on the remote. Without even looking at the
* xattr value. We leave it to the server to validate
*/
if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
return v9fs_xattr_set(dentry, handler->prefix, value, size,
return v9fs_xattr_set(dentry, handler->name, value, size,
flags);
if (S_ISLNK(inode->i_mode))
@ -319,7 +313,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
default:
BUG();
}
retval = v9fs_xattr_set(dentry, handler->prefix, value, size, flags);
retval = v9fs_xattr_set(dentry, handler->name, value, size, flags);
if (!retval)
set_cached_acl(inode, handler->flags, acl);
err_out:
@ -328,14 +322,14 @@ err_out:
}
const struct xattr_handler v9fs_xattr_acl_access_handler = {
.prefix = XATTR_NAME_POSIX_ACL_ACCESS,
.name = XATTR_NAME_POSIX_ACL_ACCESS,
.flags = ACL_TYPE_ACCESS,
.get = v9fs_xattr_get_acl,
.set = v9fs_xattr_set_acl,
};
const struct xattr_handler v9fs_xattr_acl_default_handler = {
.prefix = XATTR_NAME_POSIX_ACL_DEFAULT,
.name = XATTR_NAME_POSIX_ACL_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.get = v9fs_xattr_get_acl,
.set = v9fs_xattr_set_acl,

4
fs/9p/xattr.c
View file

@ -143,8 +143,6 @@ static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
{
const char *full_name = xattr_full_name(handler, name);
if (strcmp(name, "") == 0)
return -EINVAL;
return v9fs_xattr_get(dentry, full_name, buffer, size);
}
@ -154,8 +152,6 @@ static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
{
const char *full_name = xattr_full_name(handler, name);
if (strcmp(name, "") == 0)
return -EINVAL;
return v9fs_xattr_set(dentry, full_name, value, size, flags);
}