ima: set appraise status in fix mode only when xattr is fixed
When a file system is mounted read-only, setting the xattr value in
fix mode fails with an error code -EROFS. The xattr should be fixed
after the file system is remounted read-write. This patch verifies
that the set xattr succeeds, before setting the appraise status value
to INTEGRITY_PASS.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index bdc8ba1..b240c58 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -42,12 +42,13 @@
return ima_match_policy(inode, func, mask, IMA_APPRAISE);
}
-static void ima_fix_xattr(struct dentry *dentry,
+static int ima_fix_xattr(struct dentry *dentry,
struct integrity_iint_cache *iint)
{
iint->ima_xattr.type = IMA_XATTR_DIGEST;
- __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA, (u8 *)&iint->ima_xattr,
- sizeof iint->ima_xattr, 0);
+ return __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA,
+ (u8 *)&iint->ima_xattr,
+ sizeof(iint->ima_xattr), 0);
}
/*
@@ -141,8 +142,8 @@
if ((ima_appraise & IMA_APPRAISE_FIX) &&
(!xattr_value ||
xattr_value->type != EVM_IMA_XATTR_DIGSIG)) {
- ima_fix_xattr(dentry, iint);
- status = INTEGRITY_PASS;
+ if (!ima_fix_xattr(dentry, iint))
+ status = INTEGRITY_PASS;
}
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, filename,
op, cause, rc, 0);