linux-hardening - [PATCH 06/10] x86/tdx: Mark message.str as nonstring

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Message-Id: <20250207010022.749952-6-kees@kernel.org>
Date: Thu,  6 Feb 2025 17:00:15 -0800
From: Kees Cook <kees@...nel.org>
To: Andy Shevchenko <andy@...nel.org>
Cc: Kees Cook <kees@...nel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-coco@...ts.linux.dev,
	Sathya Prakash <sathya.prakash@...adcom.com>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Nilesh Javali <njavali@...vell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Sven Eckelmann <sven@...fation.org>,
	Tadeusz Struk <tadeusz.struk@...aro.org>,
	kernel test robot <lkp@...el.com>,
	Erick Archer <erick.archer@...look.com>,
	Dmitry Antipov <dmantipov@...dex.ru>,
	Ryusuke Konishi <konishi.ryusuke@...il.com>,
	Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
	linux-kernel@...r.kernel.org,
	MPT-FusionLinux.pdl@...adcom.com,
	linux-scsi@...r.kernel.org,
	mpi3mr-linuxdrv.pdl@...adcom.com,
	GR-QLogic-Storage-Upstream@...vell.com,
	linux-hardening@...r.kernel.org,
	linux-nilfs@...r.kernel.org
Subject: [PATCH 06/10] x86/tdx: Mark message.str as nonstring

In preparation for strtomem*() checking that its destination is a
nonstring, annotate message.str accordingly.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: linux-coco@...ts.linux.dev
---
 arch/x86/coco/tdx/tdx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 0d9b090b4880..977ab1ffa3fe 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -170,7 +170,7 @@ static void __noreturn tdx_panic(const char *msg)
 		/* Define register order according to the GHCI */
 		struct { u64 r14, r15, rbx, rdi, rsi, r8, r9, rdx; };
 
-		char str[64];
+		char str[64] __nonstring;
 	} message;
 
 	/* VMM assumes '\0' in byte 65, if the message took all 64 bytes */
-- 
2.34.1