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From 473b05bbdad50dc3877ab6da4ac52b5a4fc7d5e1 Mon Sep 17 00:00:00 2001
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From: Igor Mammedov <imammedo@redhat.com>
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Date: Wed, 12 Jan 2022 08:03:31 -0500
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Subject: [PATCH 11/14] acpi: fix OEM ID/OEM Table ID padding
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RH-Author: Igor Mammedov <imammedo@redhat.com>
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RH-MergeRequest: 130: acpi: fix QEMU crash when started with SLIC table
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RH-Commit: [7/10] 276af1aa7650e79f146c75ef4ec19f792e7e163c
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RH-Bugzilla: 2043531
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: MST <None>
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Commit [2] broke original '\0' padding of OEM ID and OEM Table ID
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fields in headers of ACPI tables. While it doesn't have impact on
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default values since QEMU uses 6 and 8 characters long values
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respectively, it broke usecase where IDs are provided on QEMU CLI.
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It shouldn't affect guest (but may cause licensing verification
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issues in guest OS).
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One of the broken usecases is user supplied SLIC table with IDs
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shorter than max possible length, where [2] mangles IDs with extra
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spaces in RSDT and FADT tables whereas guest OS expects those to
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mirror the respective values of the used SLIC table.
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Fix it by replacing whitespace padding with '\0' padding in
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accordance with [1] and expectations of guest OS
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1) ACPI spec, v2.0b
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17.2 AML Grammar Definition
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...
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//OEM ID of up to 6 characters. If the OEM ID is
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//shorter than 6 characters, it can be terminated
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//with a NULL character.
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2)
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Fixes: 602b458201 ("acpi: Permit OEM ID and OEM table ID fields to be changed")
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Resolves: https://gitlab.com/qemu-project/qemu/-/issues/707
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Reported-by: Dmitry V. Orekhov <dima.orekhov@gmail.com>
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Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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Cc: qemu-stable@nongnu.org
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Message-Id: <20220112130332.1648664-4-imammedo@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Ani Sinha <ani@anisinha.ca>
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Tested-by: Dmitry V. Orekhov dima.orekhov@gmail.com
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(cherry picked from commit 748c030f360a940fe0c9382c8ca1649096c3a80d)
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Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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---
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hw/acpi/aml-build.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
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index b3b3310df3..65148d5b9d 100644
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--- a/hw/acpi/aml-build.c
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+++ b/hw/acpi/aml-build.c
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@@ -1724,9 +1724,9 @@ void acpi_table_begin(AcpiTable *desc, GArray *array)
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build_append_int_noprefix(array, 0, 4); /* Length */
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build_append_int_noprefix(array, desc->rev, 1); /* Revision */
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build_append_int_noprefix(array, 0, 1); /* Checksum */
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- build_append_padded_str(array, desc->oem_id, 6, ' '); /* OEMID */
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+ build_append_padded_str(array, desc->oem_id, 6, '\0'); /* OEMID */
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/* OEM Table ID */
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- build_append_padded_str(array, desc->oem_table_id, 8, ' ');
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+ build_append_padded_str(array, desc->oem_table_id, 8, '\0');
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build_append_int_noprefix(array, 1, 4); /* OEM Revision */
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g_array_append_vals(array, ACPI_BUILD_APPNAME8, 4); /* Creator ID */
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build_append_int_noprefix(array, 1, 4); /* Creator Revision */
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--
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2.31.1
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