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authorJakub Kicinski <kuba@kernel.org>2022-08-25 03:18:30 +0300
committerDavid S. Miller <davem@davemloft.net>2022-08-29 14:47:15 +0300
commit9c5d03d362519f36cd551aec596388f895c93d2d (patch)
tree5669b75a062436435dc9d4354c668d0f61b7146c /net/netlabel
parent53a406803ca5b0b1f91beffacad4321fae4fa2a7 (diff)
downloadlinux-9c5d03d362519f36cd551aec596388f895c93d2d.tar.xz
genetlink: start to validate reserved header bytes
We had historically not checked that genlmsghdr.reserved is 0 on input which prevents us from using those precious bytes in the future. One use case would be to extend the cmd field, which is currently just 8 bits wide and 256 is not a lot of commands for some core families. To make sure that new families do the right thing by default put the onus of opting out of validation on existing families. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Paul Moore <paul@paul-moore.com> (NetLabel) Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlabel')
-rw-r--r--net/netlabel/netlabel_calipso.c1
-rw-r--r--net/netlabel/netlabel_cipso_v4.c1
-rw-r--r--net/netlabel/netlabel_mgmt.c1
-rw-r--r--net/netlabel/netlabel_unlabeled.c1
4 files changed, 4 insertions, 0 deletions
diff --git a/net/netlabel/netlabel_calipso.c b/net/netlabel/netlabel_calipso.c
index 91a19c3ea1a3..f1d5b8465217 100644
--- a/net/netlabel/netlabel_calipso.c
+++ b/net/netlabel/netlabel_calipso.c
@@ -344,6 +344,7 @@ static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
.module = THIS_MODULE,
.small_ops = netlbl_calipso_ops,
.n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
+ .resv_start_op = NLBL_CALIPSO_C_LISTALL + 1,
};
/* NetLabel Generic NETLINK Protocol Functions
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 894e6b8f1a86..fa08ee75ac06 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -767,6 +767,7 @@ static struct genl_family netlbl_cipsov4_gnl_family __ro_after_init = {
.module = THIS_MODULE,
.small_ops = netlbl_cipsov4_ops,
.n_small_ops = ARRAY_SIZE(netlbl_cipsov4_ops),
+ .resv_start_op = NLBL_CIPSOV4_C_LISTALL + 1,
};
/*
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index 032b7d7b32c7..689eaa2afbec 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -826,6 +826,7 @@ static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
.module = THIS_MODULE,
.small_ops = netlbl_mgmt_genl_ops,
.n_small_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
+ .resv_start_op = NLBL_MGMT_C_VERSION + 1,
};
/*
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 0555dffd80e0..9996883bf2b7 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -1374,6 +1374,7 @@ static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = {
.module = THIS_MODULE,
.small_ops = netlbl_unlabel_genl_ops,
.n_small_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops),
+ .resv_start_op = NLBL_UNLABEL_C_STATICLISTDEF + 1,
};
/*