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authorDmitry Kasatkin <dmitry.kasatkin@nokia.com>2011-03-09 14:28:20 -0500
committerMimi Zohar <zohar@linux.vnet.ibm.com>2011-07-18 12:29:41 -0400
commit6be5cc5246f807fd8ede9f5f1bb2826f2c598658 (patch)
tree00fc342eb91fb50df4e8eddfe2a7294b27df8117 /security/integrity/integrity.h
parent66dbc325afcef909043c30e90930a36823fc734c (diff)
downloadlinux-stericsson-6be5cc5246f807fd8ede9f5f1bb2826f2c598658.tar.gz
evm: add support for different security.evm data types
EVM protects a file's security extended attributes(xattrs) against integrity attacks. The current patchset maintains an HMAC-sha1 value across the security xattrs, storing the value as the extended attribute 'security.evm'. We anticipate other methods for protecting the security extended attributes. This patch reserves the first byte of 'security.evm' as a place holder for the type of method. Changelog v6: - move evm_ima_xattr_type definition to security/integrity/integrity.h - defined a structure for the EVM xattr called evm_ima_xattr_data (based on Serge Hallyn's suggestion) - removed unnecessary memset Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com> Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Diffstat (limited to 'security/integrity/integrity.h')
-rw-r--r--security/integrity/integrity.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 397a46b3992f..7efbf560b7d5 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -18,6 +18,17 @@
/* iint cache flags */
#define IMA_MEASURED 0x01
+enum evm_ima_xattr_type {
+ IMA_XATTR_DIGEST = 0x01,
+ EVM_XATTR_HMAC,
+ EVM_IMA_XATTR_DIGSIG,
+};
+
+struct evm_ima_xattr_data {
+ u8 type;
+ u8 digest[SHA1_DIGEST_SIZE];
+} __attribute__((packed));
+
/* integrity data associated with an inode */
struct integrity_iint_cache {
struct rb_node rb_node; /* rooted in integrity_iint_tree */