linux-kernel - [PATCH] efi/cper: Fix cper_arm_ctx

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Message-ID: <20250221111516.1468261-1-patrick.rudolph@9elements.com>
Date: Fri, 21 Feb 2025 12:15:16 +0100
From: Patrick Rudolph <patrick.rudolph@...ements.com>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] efi/cper: Fix cper_arm_ctx_info alignment

According to the UEFI Common Platform Error Record appendix, the
processor context information structure is a variable length structure,
but "is padded with zeros if the size is not a multiple of 16 bytes".

Currently this isn't honoured, causing all but the first structure to
be garbage when printed. Thus align the size to be a multiple of 16.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
---
 drivers/firmware/efi/cper-arm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/cper-arm.c b/drivers/firmware/efi/cper-arm.c
index fa9c1c3bf168..f0a63d09d3c4 100644
--- a/drivers/firmware/efi/cper-arm.c
+++ b/drivers/firmware/efi/cper-arm.c
@@ -311,7 +311,7 @@ void cper_print_proc_arm(const char *pfx,
 	ctx_info = (struct cper_arm_ctx_info *)err_info;
 	max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1;
 	for (i = 0; i < proc->context_info_num; i++) {
-		int size = sizeof(*ctx_info) + ctx_info->size;
+		int size = ALIGN(sizeof(*ctx_info) + ctx_info->size, 16);
 
 		printk("%sContext info structure %d:\n", pfx, i);
 		if (len < size) {
-- 
2.48.1