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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2015-12-02 14:44:36 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-06 21:33:52 -0500 |
| commit | 98e9cb5711c68223f0e4d5201b9a6add255ec550 (patch) | |
| tree | 12fee55d296fc85a6e8188368ca4944fc4d913a8 /fs/9p/acl.c | |
| parent | 97d79299223baab330b194437e676d301f12d5f6 (diff) | |
| download | lwn-98e9cb5711c68223f0e4d5201b9a6add255ec550.tar.gz lwn-98e9cb5711c68223f0e4d5201b9a6add255ec550.zip | |
vfs: Distinguish between full xattr names and proper prefixes
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>
Diffstat (limited to 'fs/9p/acl.c')
| -rw-r--r-- | fs/9p/acl.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/fs/9p/acl.c b/fs/9p/acl.c index 6ff30b14bc76..9da967f38387 100644 --- a/fs/9p/acl.c +++ b/fs/9p/acl.c @@ -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, |