From: Mark Brown <broonie@kernel.org>
Date: Fri, 22 Dec 2023 14:54:37 +0000 (+0000)
Subject: lsm: Add a __counted_by() annotation to lsm_ctx.ctx
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ea67677dbb0d30b993b15790d6cee24c900dd597;p=linux.git

lsm: Add a __counted_by() annotation to lsm_ctx.ctx

The ctx in struct lsm_ctx is an array of size ctx_len, tell the compiler
about this using __counted_by() where supported to improve the ability to
detect overflow issues.

Reported-by: Aishwarya TCV <aishwarya.tcv@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
---

diff --git a/include/uapi/linux/lsm.h b/include/uapi/linux/lsm.h
index f0386880a78e..f8aef9ade549 100644
--- a/include/uapi/linux/lsm.h
+++ b/include/uapi/linux/lsm.h
@@ -9,6 +9,7 @@
 #ifndef _UAPI_LINUX_LSM_H
 #define _UAPI_LINUX_LSM_H
 
+#include <linux/stddef.h>
 #include <linux/types.h>
 #include <linux/unistd.h>
 
@@ -36,7 +37,7 @@ struct lsm_ctx {
 	__u64 flags;
 	__u64 len;
 	__u64 ctx_len;
-	__u8 ctx[];
+	__u8 ctx[] __counted_by(ctx_len);
 };
 
 /*