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x86/efi: skip memattr table on kexec boot

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efi_memattr_init() added a sanity check to avoid firmware caused corruption.
The check is based on efi memmap entry numbers, but kexec only takes the
runtime related memmap entries thus this caused many false warnings, see
below thread for details:

https://lore.kernel.org/all/[email protected]/

Ard suggests to skip the efi memattr table in kexec, this makes sense because
those memattr fixups are not critical.

Fixes: 8fbe4c49c0 ("efi/memattr: Ignore table if the size is clearly bogus")
Cc: <[email protected]> # v6.13+
Reported-by: Breno Leitao <[email protected]>
Reported-and-tested-by: Usama Arif <[email protected]>
Suggested-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Dave Young <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
This commit is contained in:
Dave Young authored and Ard Biesheuvel committed 2025-01-23 09:58:43 +01:00
1 parent b5d1e6ee76
commit 64b45dd46e
1 file changed
+5
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arch/x86/platform/efi/quirks.c
+5
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@@ -561,6 +561,11 @@ int __init efi_reuse_config(u64 tables, int nr_tables)
if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID))
((efi_config_table_64_t *)p)->table = data->smbios;
/* Do not bother to play with mem attr table across kexec */
if (!efi_guidcmp(guid, EFI_MEMORY_ATTRIBUTES_TABLE_GUID))
((efi_config_table_64_t *)p)->table = EFI_INVALID_TABLE_ADDR;
p += sz;
}
early_memunmap(tablep, nr_tables * sz);