linux-kernel - Re: [PATCH 00/14] EVM

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Date:	Wed, 21 Apr 2010 18:18:58 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH 00/14] EVM

On Wed, 2010-04-21 at 14:58 -0700, Randy Dunlap wrote:
> On Wed, 21 Apr 2010 17:49:40 -0400 Mimi Zohar wrote:
> 
> > Extended Verification Module(EVM) detects offline tampering of the
> > security extended attributes (e.g. security.selinux, security.SMACK64,
> > security.ima), which is the basis for LSM permission decisions and,
> > with this set of patches, integrity appraisal decisions. To detect
> > offline tampering of the extended attributes, EVM maintains an
> > HMAC-sha1 across a set of security extended attributes, storing the
> > HMAC as the extended attribute 'security.evm'. To verify the integrity
> > of an extended attribute, EVM exports evm_verifyxattr(), which
> > re-calculates the HMAC and compares it with the version stored in
> > 'security.evm'.
> > 
> ...
> > 
> > Much appreciation to Dave Hansen, Serge Hallyn, and Matt Helsley for
> > reviewing the patches.
> > 
> > Mimi
> > 
> > Mimi Zohar (14):
> >   integrity: move ima inode integrity data management
> >   security: move LSM xattrnames to xattr.h
> >   xattr: define vfs_getxattr_alloc and vfs_xattr_cmp
> >   evm: re-release
> >   ima: move ima_file_free before releasing the file
> >   security: imbed evm calls in security hooks
> >   evm: inode post removexattr
> >   evm: imbed evm_inode_post_setattr
> >   evm: inode_post_init
> >   fs: add evm_inode_post_init calls
> >   ima: integrity appraisal extension
> >   ima: appraise default rules
> >   ima: inode post_setattr
> >   ima: add ima_inode_setxattr and ima_inode_removexattr
> > --
> 
> A summary diffstat would be good to see in patch 00/14.
> 
> Lacking that, at least each individual patch should have a diffstat summary
> in it.  Please read Documentation/SubmittingPatches.
> 
> ---
> ~Randy

Only two minor changes from the RFC posting:

0011-ima-integrity-appraisal-extension.patch adds a missing
ima_fix_xattr() call.

Index: security-testing-2.6/security/integrity/ima/ima_appraise.c
===================================================================
--- security-testing-2.6.orig/security/integrity/ima/ima_appraise.c
+++ security-testing-2.6/security/integrity/ima/ima_appraise.c
@@ -92,8 +92,13 @@ int ima_appraise_measurement(struct inte
 				ima_fix_xattr(dentry, iint);
 			integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
 					    filename, op, cause, 1, 0);
-		} else
+		} else {
 			status = INTEGRITY_PASS;
+
+			if ((status == INTEGRITY_UNKNOWN)
+			    && (ima_appraise & IMA_APPRAISE_FIX))
+				ima_fix_xattr(dentry, iint);
+		}
 		iint->flags |= IMA_APPRAISED;
 	} else {
 		if (status == INTEGRITY_NOLABEL)

0012-ima-appraise-default-rules.patch replaces audit_log_format() calls
with ima_log_string(), introduced in Eric's patches.

Mimi


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