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From 5397ab9995f7354e7f8122a8a91c810256afa3d1 Mon Sep 17 00:00:00 2001
From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Wed, 26 Jun 2024 13:42:30 +0200
Subject: [PATCH 32/56] xen/ubsan: Fix UB in type_descriptor declaration
struct type_descriptor is arranged with a NUL terminated string following the
kind/info fields.
The only reason this doesn't trip UBSAN detection itself (on more modern
compilers at least) is because struct type_descriptor is only referenced in
suppressed regions.
Switch the declaration to be a real flexible member. No functional change.
Fixes: 00fcf4dd8eb4 ("xen/ubsan: Import ubsan implementation from Linux 4.13")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: bd59af99700f075d06a6d47a16f777c9519928e0
master date: 2024-06-18 14:55:04 +0100
---
xen/common/ubsan/ubsan.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/common/ubsan/ubsan.h b/xen/common/ubsan/ubsan.h
index a3159040fe..3db42e75b1 100644
--- a/xen/common/ubsan/ubsan.h
+++ b/xen/common/ubsan/ubsan.h
@@ -10,7 +10,7 @@ enum {
struct type_descriptor {
u16 type_kind;
u16 type_info;
- char type_name[1];
+ char type_name[];
};
struct source_location {
--
2.45.2
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