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evm: posix acls modify i_mode

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The posix xattr acls are 'system' prefixed, which normally would not
affect security.evm.  An interesting side affect of writing posix xattr
acls is their modifying of the i_mode, which is included in security.evm.

This patch updates security.evm when posix xattr acls are written.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
This commit is contained in:
Mimi Zohar
2011-08-18 18:07:44 -04:00
parent a924ce0b35
commit bf6d0f5dcd
5 changed files with 59 additions and 5 deletions
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26
security/integrity/evm/evm_posix_acl.c Normal file
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@@ -0,0 +1,26 @@
/*
* Copyright (C) 2011 IBM Corporation
*
* Author:
* Mimi Zohar <zohar@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*/
#include <linux/module.h>
#include <linux/xattr.h>
int posix_xattr_acl(char *xattr)
{
int xattr_len = strlen(xattr);
if ((strlen(XATTR_NAME_POSIX_ACL_ACCESS) == xattr_len)
&& (strncmp(XATTR_NAME_POSIX_ACL_ACCESS, xattr, xattr_len) == 0))
return 1;
if ((strlen(XATTR_NAME_POSIX_ACL_DEFAULT) == xattr_len)
&& (strncmp(XATTR_NAME_POSIX_ACL_DEFAULT, xattr, xattr_len) == 0))
return 1;
return 0;
}