[PATCH][next] integrity: Use static_assert() to check struct sizes

["Gustavo A. R. Silva" <gustavoars@kernel.org>]

Commit 38aa3f5ac6d2 ("integrity: Avoid -Wflex-array-member-not-at-end
warnings") introduced tagged `struct evm_ima_xattr_data_hdr` and
`struct ima_digest_data_hdr`. We want to ensure that when new members
need to be added to the flexible structures, they are always included
within these tagged structs.

So, we use `static_assert()` to ensure that the memory layout for
both the flexible structure and the tagged struct is the same after
any changes.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 security/integrity/integrity.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 660f76cb69d3..c2c2da691123 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -37,6 +37,8 @@ struct evm_ima_xattr_data {
 	);
 	u8 data[];
 } __packed;
+static_assert(offsetof(struct evm_ima_xattr_data, data) == sizeof(struct evm_ima_xattr_data_hdr),
+	      "struct member likely outside of __struct_group()");
 
 /* Only used in the EVM HMAC code. */
 struct evm_xattr {
@@ -65,6 +67,8 @@ struct ima_digest_data {
 	);
 	u8 digest[];
 } __packed;
+static_assert(offsetof(struct ima_digest_data, digest) == sizeof(struct ima_digest_data_hdr),
+	      "struct member likely outside of __struct_group()");
 
 /*
  * Instead of wrapping the ima_digest_data struct inside a local structure
-- 
2.34.1