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34 lines
1.4 KiB
Diff
34 lines
1.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Date: Wed, 16 Oct 2024 16:20:24 +1100
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Subject: [PATCH] acpi: Fix out of bounds access in grub_acpi_xsdt_find_table()
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The calculation of the size of the table was incorrect (copy/pasta from
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grub_acpi_rsdt_find_table() I assume...). The entries are 64-bit long.
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This causes us to access beyond the end of the table which is causing
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crashes during boot on some systems. Typically this is causing a crash
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on VMWare when using UEFI and enabling serial autodetection, as
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grub_acpi_find_table (GRUB_ACPI_SPCR_SIGNATURE);
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Will goes past the end of the table (the SPCR table doesn't exits)
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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---
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grub-core/kern/acpi.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/grub-core/kern/acpi.c b/grub-core/kern/acpi.c
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index 48ded4e2ea6e..8ff0835d501f 100644
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--- a/grub-core/kern/acpi.c
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+++ b/grub-core/kern/acpi.c
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@@ -75,7 +75,7 @@ grub_acpi_xsdt_find_table (struct grub_acpi_table_header *xsdt, const char *sig)
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return 0;
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ptr = (grub_unaligned_uint64_t *) (xsdt + 1);
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- s = (xsdt->length - sizeof (*xsdt)) / sizeof (grub_uint32_t);
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+ s = (xsdt->length - sizeof (*xsdt)) / sizeof (grub_uint64_t);
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for (; s; s--, ptr++)
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{
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struct grub_acpi_table_header *tbl;
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