6.13-stable review patch. If anyone has any objections, please let me know.
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From: Dave Young dyoung@redhat.com
commit 64b45dd46e154ee7641d7e0457f3fa266e57179f upstream.
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/20250108215957.3437660-2-usamaarif642@gmail.com/
Ard suggests to skip the efi memattr table in kexec, this makes sense because those memattr fixups are not critical.
Fixes: 8fbe4c49c0cc ("efi/memattr: Ignore table if the size is clearly bogus") Cc: stable@vger.kernel.org # v6.13+ Reported-by: Breno Leitao leitao@debian.org Reported-and-tested-by: Usama Arif usamaarif642@gmail.com Suggested-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Dave Young dyoung@redhat.com Signed-off-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/platform/efi/quirks.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c index 846bf49f2508..553f330198f2 100644 --- a/arch/x86/platform/efi/quirks.c +++ b/arch/x86/platform/efi/quirks.c @@ -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);