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From 636a09dbe361517ac2b8d810166676b5006a6ca2 Mon Sep 17 00:00:00 2001
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From: Igor Mammedov <imammedo@redhat.com>
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Date: Mon, 27 Dec 2021 14:31:17 -0500
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Subject: [PATCH 05/14] acpi: fix QEMU crash when started with SLIC table
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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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: [1/10] 67c1d1d2358d0ba746f260dfc3c1cfc165357fd1
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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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if QEMU is started with used provided SLIC table blob,
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-acpitable sig=SLIC,oem_id='CRASH ',oem_table_id="ME",oem_rev=00002210,asl_compiler_id="",asl_compiler_rev=00000000,data=/dev/null
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it will assert with:
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hw/acpi/aml-build.c:61:build_append_padded_str: assertion failed: (len <= maxlen)
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and following backtrace:
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...
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build_append_padded_str (array=0x555556afe320, str=0x555556afdb2e "CRASH ME", maxlen=0x6, pad=0x20) at hw/acpi/aml-build.c:61
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acpi_table_begin (desc=0x7fffffffd1b0, array=0x555556afe320) at hw/acpi/aml-build.c:1727
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build_fadt (tbl=0x555556afe320, linker=0x555557ca3830, f=0x7fffffffd318, oem_id=0x555556afdb2e "CRASH ME", oem_table_id=0x555556afdb34 "ME") at hw/acpi/aml-build.c:2064
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...
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which happens due to acpi_table_begin() expecting NULL terminated
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oem_id and oem_table_id strings, which is normally the case, but
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in case of user provided SLIC table, oem_id points to table's blob
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directly and as result oem_id became longer than expected.
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Fix issue by handling oem_id consistently and make acpi_get_slic_oem()
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return NULL terminated strings.
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PS:
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After [1] refactoring, oem_id semantics became inconsistent, where
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NULL terminated string was coming from machine and old way pointer
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into byte array coming from -acpitable option. That used to work
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since build_header() wasn't expecting NULL terminated string and
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blindly copied the 1st 6 bytes only.
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However commit [2] broke that by replacing build_header() with
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acpi_table_begin(), which was expecting NULL terminated string
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and was checking oem_id size.
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1) 602b45820 ("acpi: Permit OEM ID and OEM table ID fields to be changed")
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2)
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Fixes: 4b56e1e4eb08 ("acpi: build_fadt: use acpi_table_begin()/acpi_table_end() instead of build_header()")
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Resolves: https://gitlab.com/qemu-project/qemu/-/issues/786
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Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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Message-Id: <20211227193120.1084176-2-imammedo@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Tested-by: Denis Lisov <dennis.lissov@gmail.com>
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Tested-by: Alexander Tsoy <alexander@tsoy.me>
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Cc: qemu-stable@nongnu.org
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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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(cherry picked from commit 8cdb99af45365727ac17f45239a9b8c1d5155c6d)
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Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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---
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hw/acpi/core.c | 4 ++--
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hw/i386/acpi-build.c | 2 ++
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2 files changed, 4 insertions(+), 2 deletions(-)
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diff --git a/hw/acpi/core.c b/hw/acpi/core.c
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index 1e004d0078..3e811bf03c 100644
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--- a/hw/acpi/core.c
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+++ b/hw/acpi/core.c
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@@ -345,8 +345,8 @@ int acpi_get_slic_oem(AcpiSlicOem *oem)
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struct acpi_table_header *hdr = (void *)(u - sizeof(hdr->_length));
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if (memcmp(hdr->sig, "SLIC", 4) == 0) {
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- oem->id = hdr->oem_id;
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- oem->table_id = hdr->oem_table_id;
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+ oem->id = g_strndup(hdr->oem_id, 6);
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+ oem->table_id = g_strndup(hdr->oem_table_id, 8);
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return 0;
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}
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}
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diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
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index 8383b83ee3..0234fe7588 100644
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--- a/hw/i386/acpi-build.c
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+++ b/hw/i386/acpi-build.c
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@@ -2723,6 +2723,8 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
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/* Cleanup memory that's no longer used. */
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g_array_free(table_offsets, true);
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+ g_free(slic_oem.id);
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+ g_free(slic_oem.table_id);
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}
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static void acpi_ram_update(MemoryRegion *mr, GArray *data)
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--
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2.31.1
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