diff mbox series

[07/10] xfrm: add extack to xfrm_new_ae and xfrm_replay_verify_len

Message ID 20221126110303.1859238-8-steffen.klassert@secunet.com (mailing list archive)
State Accepted
Commit 643bc1a2ee30efc9ab832401e89c9400cd9f52ac
Delegated to: Netdev Maintainers
Headers show
Series [01/10] esp6: remove redundant variable err | expand

Checks

Context Check Description
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Pull request is its own cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 15 this patch: 15
netdev/cc_maintainers warning 2 maintainers not CCed: pabeni@redhat.com edumazet@google.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 15 this patch: 15
netdev/checkpatch warning WARNING: Missing commit description - Add an appropriate one WARNING: line length of 105 exceeds 80 columns WARNING: line length of 86 exceeds 80 columns WARNING: line length of 96 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Steffen Klassert Nov. 26, 2022, 11:03 a.m. UTC 
From: Sabrina Dubroca <sd@queasysnail.net>

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
 net/xfrm/xfrm_user.c | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 06a379d35ebb..13607df4f30d 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -515,7 +515,8 @@  static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
 }
 
 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
-					 struct nlattr *rp)
+					 struct nlattr *rp,
+					 struct netlink_ext_ack *extack)
 {
 	struct xfrm_replay_state_esn *up;
 	unsigned int ulen;
@@ -528,13 +529,25 @@  static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_es
 
 	/* Check the overall length and the internal bitmap length to avoid
 	 * potential overflow. */
-	if (nla_len(rp) < (int)ulen ||
-	    xfrm_replay_state_esn_len(replay_esn) != ulen ||
-	    replay_esn->bmp_len != up->bmp_len)
+	if (nla_len(rp) < (int)ulen) {
+		NL_SET_ERR_MSG(extack, "ESN attribute is too short");
 		return -EINVAL;
+	}
 
-	if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
+	if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
+		NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
 		return -EINVAL;
+	}
+
+	if (replay_esn->bmp_len != up->bmp_len) {
+		NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
+		return -EINVAL;
+	}
+
+	if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
+		NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
+		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -2433,12 +2446,16 @@  static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 
-	if (!lt && !rp && !re && !et && !rt)
+	if (!lt && !rp && !re && !et && !rt) {
+		NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
 		return err;
+	}
 
 	/* pedantic mode - thou shalt sayeth replaceth */
-	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
+	if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
+		NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
 		return err;
+	}
 
 	mark = xfrm_mark_get(attrs, &m);
 
@@ -2446,10 +2463,12 @@  static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (x == NULL)
 		return -ESRCH;
 
-	if (x->km.state != XFRM_STATE_VALID)
+	if (x->km.state != XFRM_STATE_VALID) {
+		NL_SET_ERR_MSG(extack, "SA must be in VALID state");
 		goto out;
+	}
 
-	err = xfrm_replay_verify_len(x->replay_esn, re);
+	err = xfrm_replay_verify_len(x->replay_esn, re, extack);
 	if (err)
 		goto out;