From b4bfec7f4a86424b114f94f41c4e1841ec102df3 Mon Sep 17 00:00:00 2001 From: Seth Forshee Date: Mon, 1 Aug 2016 08:19:10 -0500 Subject: security/integrity: Harden against malformed xattrs In general the handling of IMA/EVM xattrs is good, but I found a few locations where either the xattr size or the value of the type field in the xattr are not checked. Add a few simple checks to these locations to prevent malformed or malicious xattrs from causing problems. Signed-off-by: Seth Forshee Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_appraise.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'security/integrity/ima') diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index a705598ced5f..1fd9539a969d 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -130,6 +130,7 @@ enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len) { struct signature_v2_hdr *sig; + enum hash_algo ret; if (!xattr_value || xattr_len < 2) /* return default hash algo */ @@ -143,7 +144,9 @@ enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, return sig->hash_algo; break; case IMA_XATTR_DIGEST_NG: - return xattr_value->digest[0]; + ret = xattr_value->digest[0]; + if (ret < HASH_ALGO__LAST) + return ret; break; case IMA_XATTR_DIGEST: /* this is for backward compatibility */ -- cgit v1.2.1