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authorMimi Zohar <zohar@linux.vnet.ibm.com>2015-04-21 13:59:31 -0400
committerMimi Zohar <zohar@linux.vnet.ibm.com>2015-05-21 13:28:47 -0400
commit5101a1850bb7ccbf107929dee9af0cd2f400940f (patch)
tree5ef7ac633c626864273b091ffe6b180e5b92297f /security/integrity
parentima: remove definition of IMA_X509_PATH (diff)
downloadlinux-dev-5101a1850bb7ccbf107929dee9af0cd2f400940f.tar.xz
linux-dev-5101a1850bb7ccbf107929dee9af0cd2f400940f.zip
evm: labeling pseudo filesystems exception
To prevent offline stripping of existing file xattrs and relabeling of them at runtime, EVM allows only newly created files to be labeled. As pseudo filesystems are not persistent, stripping of xattrs is not a concern. Some LSMs defer file labeling on pseudo filesystems. This patch permits the labeling of existing files on pseudo files systems. Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/evm/evm_main.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 10f994307a04..582091498819 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -296,6 +296,17 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
iint = integrity_iint_find(d_backing_inode(dentry));
if (iint && (iint->flags & IMA_NEW_FILE))
return 0;
+
+ /* exception for pseudo filesystems */
+ if (dentry->d_inode->i_sb->s_magic == TMPFS_MAGIC
+ || dentry->d_inode->i_sb->s_magic == SYSFS_MAGIC)
+ return 0;
+
+ integrity_audit_msg(AUDIT_INTEGRITY_METADATA,
+ dentry->d_inode, dentry->d_name.name,
+ "update_metadata",
+ integrity_status_msg[evm_status],
+ -EPERM, 0);
}
out:
if (evm_status != INTEGRITY_PASS)