linux-kernel - [PATCH 4.19 74/98] x86/boot: Fix boot regression caused by bootparam sanitizing

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Message-Id: <20190827072722.081796585@linuxfoundation.org>
Date:   Tue, 27 Aug 2019 09:50:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Neil MacLeod <neil@...cleod.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 4.19 74/98] x86/boot: Fix boot regression caused by bootparam sanitizing

From: John Hubbard <jhubbard@...dia.com>

commit 7846f58fba964af7cb8cf77d4d13c33254725211 upstream.

commit a90118c445cc ("x86/boot: Save fields explicitly, zero out everything
else") had two errors:

    * It preserved boot_params.acpi_rsdp_addr, and
    * It failed to preserve boot_params.hdr

Therefore, zero out acpi_rsdp_addr, and preserve hdr.

Fixes: a90118c445cc ("x86/boot: Save fields explicitly, zero out everything else")
Reported-by: Neil MacLeod <neil@...cleod.com>
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Neil MacLeod <neil@...cleod.com>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/20190821192513.20126-1-jhubbard@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/bootparam_utils.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/include/asm/bootparam_utils.h
+++ b/arch/x86/include/asm/bootparam_utils.h
@@ -71,6 +71,7 @@ static void sanitize_boot_params(struct
 			BOOT_PARAM_PRESERVE(eddbuf_entries),
 			BOOT_PARAM_PRESERVE(edd_mbr_sig_buf_entries),
 			BOOT_PARAM_PRESERVE(edd_mbr_sig_buffer),
+			BOOT_PARAM_PRESERVE(hdr),
 			BOOT_PARAM_PRESERVE(e820_table),
 			BOOT_PARAM_PRESERVE(eddbuf),
 		};