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| author | Peter Jones <pjones@redhat.com> | 2021-04-10 16:05:23 -0400 |
|---|---|---|
| committer | Peter Jones <pjones@redhat.com> | 2021-05-24 16:05:18 -0400 |
| commit | 493bd940e5c6e28e673034687de7adef9529efff (patch) | |
| tree | 7b65c7673e846934dd9148d3e7208fb748175edc /mok.c | |
| parent | 4068fd42c891ea6ebdec056f461babc6e4048844 (diff) | |
| download | efi-boot-shim-493bd940e5c6e28e673034687de7adef9529efff.tar.gz efi-boot-shim-493bd940e5c6e28e673034687de7adef9529efff.zip | |
Don't call QueryVariableInfo() on EFI 1.10 machines
The EFI 1.10 spec (and presumably earlier revisions as well) didn't have
RT->QueryVariableInfo(), and on Chris Murphy's MacBookPro8,2 , that
memory appears to be initialized randomly.
This patch changes it to not call RT->QueryVariableInfo() if the
EFI_RUNTIME_SERVICES table's major revision is less than two, and
assumes our maximum variable size is 1024 in that case.
Signed-off-by: Peter Jones <pjones@redhat.com>
Diffstat (limited to 'mok.c')
| -rw-r--r-- | mok.c | 23 |
1 files changed, 18 insertions, 5 deletions
@@ -261,6 +261,9 @@ static const uint8_t null_sha256[32] = { 0, }; typedef UINTN SIZE_T; +#define EFI_MAJOR_VERSION(tablep) ((UINT16)((((tablep)->Hdr.Revision) >> 16) & 0xfffful)) +#define EFI_MINOR_VERSION(tablep) ((UINT16)(((tablep)->Hdr.Revision) & 0xfffful)) + static EFI_STATUS get_max_var_sz(UINT32 attrs, SIZE_T *max_var_szp) { @@ -270,11 +273,21 @@ get_max_var_sz(UINT32 attrs, SIZE_T *max_var_szp) uint64_t max_var_sz = 0; *max_var_szp = 0; - efi_status = gRT->QueryVariableInfo(attrs, &max_storage_sz, - &remaining_sz, &max_var_sz); - if (EFI_ERROR(efi_status)) { - perror(L"Could not get variable storage info: %r\n", efi_status); - return efi_status; + if (EFI_MAJOR_VERSION(gRT) < 2) { + dprint(L"EFI %d.%d; no RT->QueryVariableInfo(). Using 1024!\n", + EFI_MAJOR_VERSION(gRT), EFI_MINOR_VERSION(gRT)); + max_var_sz = remaining_sz = max_storage_sz = 1024; + efi_status = EFI_SUCCESS; + } else { + dprint(L"calling RT->QueryVariableInfo() at 0x%lx\n", + gRT->QueryVariableInfo); + efi_status = gRT->QueryVariableInfo(attrs, &max_storage_sz, + &remaining_sz, &max_var_sz); + if (EFI_ERROR(efi_status)) { + perror(L"Could not get variable storage info: %r\n", + efi_status); + return efi_status; + } } /* |