From 367cbfaae87c1f539c729b0653d920701beac3be Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sun, 20 Jul 2014 14:09:34 +0200 Subject: src: stricter netlink attribute length validation If the kernel sends us different data length for a given attribute, stop further processing and indicate that an ABI breakage has ocurred. This is an example of the (hypothetical) message that is shown in that case: nf_tables kernel ABI is broken, contact your vendor. table.c:214 reason: Numerical result out of range Signed-off-by: Pablo Neira Ayuso --- src/expr/byteorder.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'src/expr/byteorder.c') diff --git a/src/expr/byteorder.c b/src/expr/byteorder.c index 3659918..ad28bc4 100644 --- a/src/expr/byteorder.c +++ b/src/expr/byteorder.c @@ -99,10 +99,8 @@ static int nft_rule_expr_byteorder_cb(const struct nlattr *attr, void *data) case NFTA_BYTEORDER_OP: case NFTA_BYTEORDER_LEN: case NFTA_BYTEORDER_SIZE: - if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { - perror("mnl_attr_validate"); - return MNL_CB_ERROR; - } + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); break; } -- cgit v1.2.3