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44 lines
1.6 KiB
Diff
44 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Lukasz Hawrylko <lukasz.hawrylko@linux.intel.com>
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Date: Mon, 16 Dec 2019 11:15:55 +0100
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Subject: [PATCH] multiboot2: Set min address for mbi allocation to 0x1000
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In some cases GRUB2 allocates multiboot2 structure at 0 address, that is
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a confusing behavior. Consumers of that structure can have internal NULL-checks
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that will throw an error when get a pointer to data allocated at address 0.
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To prevent that, define min address for mbi allocation on x86 and x86_64
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platforms.
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Signed-off-by: Lukasz Hawrylko <lukasz.hawrylko@linux.intel.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Upstream-commit-id: 0f3f5b7c13f
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---
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grub-core/loader/multiboot_mbi2.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/grub-core/loader/multiboot_mbi2.c b/grub-core/loader/multiboot_mbi2.c
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index 47d4c6f0977..797870b6138 100644
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--- a/grub-core/loader/multiboot_mbi2.c
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+++ b/grub-core/loader/multiboot_mbi2.c
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@@ -49,6 +49,12 @@
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#define HAS_VGA_TEXT 0
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#endif
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+#if defined (__i386__) || defined (__x86_64__)
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+#define MBI_MIN_ADDR 0x1000
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+#else
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+#define MBI_MIN_ADDR 0
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+#endif
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+
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struct module
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{
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struct module *next;
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@@ -747,7 +753,7 @@ grub_multiboot2_make_mbi (grub_uint32_t *target)
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COMPILE_TIME_ASSERT (MULTIBOOT_TAG_ALIGN % sizeof (grub_properly_aligned_t) == 0);
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err = grub_relocator_alloc_chunk_align (grub_multiboot2_relocator, &ch,
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- 0, 0xffffffff - bufsize,
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+ MBI_MIN_ADDR, 0xffffffff - bufsize,
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bufsize, MULTIBOOT_TAG_ALIGN,
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GRUB_RELOCATOR_PREFERENCE_NONE, 1);
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if (err)
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