From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f200.google.com (mail-io0-f200.google.com [209.85.223.200]) by kanga.kvack.org (Postfix) with ESMTP id 518156B0260 for ; Thu, 8 Dec 2016 16:52:32 -0500 (EST) Received: by mail-io0-f200.google.com with SMTP id b194so22004979ioa.6 for ; Thu, 08 Dec 2016 13:52:32 -0800 (PST) Received: from ch3vs02.rockwellcollins.com (ch3vs02.rockwellcollins.com. [205.175.226.29]) by mx.google.com with ESMTPS id q7si10462828itb.45.2016.12.08.13.52.31 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 08 Dec 2016 13:52:31 -0800 (PST) From: David Graziano Subject: [PATCH RFC v3 1/3] xattr: add simple initxattrs function Date: Thu, 8 Dec 2016 15:52:26 -0600 Message-Id: <1481233948-53350-2-git-send-email-david.graziano@rockwellcollins.com> In-Reply-To: <1481233948-53350-1-git-send-email-david.graziano@rockwellcollins.com> References: <1481233948-53350-1-git-send-email-david.graziano@rockwellcollins.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-security-module@vger.kernel.org Cc: paul@paul-moore.com, agruenba@redhat.com, hch@infradead.org, linux-mm@kvack.org, David Graziano Adds new simple_xattr_initxattrs() initialization function for initializing the extended attributes via LSM callback. Based on callback function used by tmpfs/shmem. This is allows for consolidation and avoiding code duplication when other filesystem need to implement a simple initxattrs LSM callback function. Signed-off-by: David Graziano --- fs/xattr.c | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/xattr.h | 3 +++ 2 files changed, 42 insertions(+) diff --git a/fs/xattr.c b/fs/xattr.c index c243905..69dd142 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -994,3 +994,42 @@ void simple_xattr_list_add(struct simple_xattrs *xattrs, list_add(&new_xattr->list, &xattrs->head); spin_unlock(&xattrs->lock); } + +/* + * Callback for security_inode_init_security() for acquiring xattrs. + */ +int simple_xattr_initxattrs(struct inode *inode, + const struct xattr *xattr_array, + void *fs_info) +{ + struct simple_xattrs *xattrs; + const struct xattr *xattr; + struct simple_xattr *new_xattr; + size_t len; + + if (!fs_info) + return -ENOMEM; + xattrs = (struct simple_xattrs *) fs_info; + + for (xattr = xattr_array; xattr->name != NULL; xattr++) { + new_xattr = simple_xattr_alloc(xattr->value, xattr->value_len); + if (!new_xattr) + return -ENOMEM; + len = strlen(xattr->name) + 1; + new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len, + GFP_KERNEL); + if (!new_xattr->name) { + kfree(new_xattr); + return -ENOMEM; + } + + memcpy(new_xattr->name, XATTR_SECURITY_PREFIX, + XATTR_SECURITY_PREFIX_LEN); + memcpy(new_xattr->name + XATTR_SECURITY_PREFIX_LEN, + xattr->name, len); + + simple_xattr_list_add(xattrs, new_xattr); + } + + return 0; +} diff --git a/include/linux/xattr.h b/include/linux/xattr.h index 94079ba..a787d1a 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -108,5 +108,8 @@ ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, cha size_t size); void simple_xattr_list_add(struct simple_xattrs *xattrs, struct simple_xattr *new_xattr); +int simple_xattr_initxattrs(struct inode *inode, + const struct xattr *xattr_array, + void *fs_info); #endif /* _LINUX_XATTR_H */ -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org