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fallback.c
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fallback.c
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// SPDX-License-Identifier: BSD-2-Clause-Patent
/*
* Copyright Red Hat, Inc.
* Copyright Peter Jones <[email protected]>
*/
#include "shim.h"
#define NO_REBOOT L"FB_NO_REBOOT"
EFI_LOADED_IMAGE *this_image = NULL;
int
get_fallback_verbose(void)
{
#ifdef FALLBACK_VERBOSE
return 1;
#else
UINT8 *data = NULL;
UINTN dataSize = 0;
EFI_STATUS efi_status;
unsigned int i;
static int state = -1;
if (state != -1)
return state;
efi_status = get_variable(L"FALLBACK_VERBOSE",
&data, &dataSize, SHIM_LOCK_GUID);
if (EFI_ERROR(efi_status)) {
state = 0;
return state;
}
state = 0;
for (i = 0; i < dataSize; i++) {
if (data[i]) {
state = 1;
break;
}
}
if (data)
FreePool(data);
return state;
#endif
}
#define VerbosePrintUnprefixed(fmt, ...) \
({ \
UINTN ret_ = 0; \
if (get_fallback_verbose()) \
ret_ = console_print((fmt), ##__VA_ARGS__); \
ret_; \
})
#define VerbosePrint(fmt, ...) \
({ \
UINTN line_ = __LINE__ - 2; \
UINTN ret_ = 0; \
if (get_fallback_verbose()) { \
console_print(L"%a:%d: ", __func__, line_); \
ret_ = console_print((fmt), ##__VA_ARGS__); \
} \
ret_; \
})
static EFI_STATUS
FindSubDevicePath(EFI_DEVICE_PATH *In, UINT8 Type, UINT8 SubType,
EFI_DEVICE_PATH **Out)
{
EFI_DEVICE_PATH *dp = In;
if (!In || !Out)
return EFI_INVALID_PARAMETER;
CHAR16 *dps = DevicePathToStr(In);
VerbosePrint(L"input device path: \"%s\"\n", dps);
FreePool(dps);
for (dp = In; !IsDevicePathEnd(dp); dp = NextDevicePathNode(dp)) {
if (DevicePathType(dp) == Type &&
DevicePathSubType(dp) == SubType) {
dps = DevicePathToStr(dp);
VerbosePrint(L"sub-path (%hhd,%hhd): \"%s\"\n",
Type, SubType, dps);
FreePool(dps);
*Out = DuplicateDevicePath(dp);
if (!*Out)
return EFI_OUT_OF_RESOURCES;
return EFI_SUCCESS;
}
}
*Out = NULL;
return EFI_NOT_FOUND;
}
static EFI_STATUS
get_file_size(EFI_FILE_HANDLE fh, UINTN *retsize)
{
EFI_STATUS efi_status;
void *buffer = NULL;
UINTN bs = 0;
/* The API here is "Call it once with bs=0, it fills in bs,
* then allocate a buffer and ask again to get it filled. */
efi_status = fh->GetInfo(fh, &EFI_FILE_INFO_GUID, &bs, NULL);
if (EFI_ERROR(efi_status) && efi_status != EFI_BUFFER_TOO_SMALL)
return efi_status;
if (bs == 0)
return EFI_SUCCESS;
buffer = AllocateZeroPool(bs);
if (!buffer) {
console_print(L"Could not allocate memory\n");
return EFI_OUT_OF_RESOURCES;
}
efi_status = fh->GetInfo(fh, &EFI_FILE_INFO_GUID, &bs, buffer);
/* This checks *either* the error from the first GetInfo, if it isn't
* the EFI_BUFFER_TOO_SMALL we're expecting, or the second GetInfo
* call in *any* case. */
if (EFI_ERROR(efi_status)) {
console_print(L"Could not get file info: %r\n", efi_status);
if (buffer)
FreePool(buffer);
return efi_status;
}
EFI_FILE_INFO *fi = buffer;
*retsize = fi->FileSize;
FreePool(buffer);
return EFI_SUCCESS;
}
EFI_STATUS
read_file(EFI_FILE_HANDLE fh, CHAR16 *fullpath, CHAR16 **buffer, UINT64 *bs)
{
EFI_FILE_HANDLE fh2;
EFI_STATUS efi_status;
efi_status = fh->Open(fh, &fh2, fullpath, EFI_FILE_READ_ONLY, 0);
if (EFI_ERROR(efi_status)) {
console_print(L"Couldn't open \"%s\": %r\n", fullpath, efi_status);
return efi_status;
}
UINTN len = 0;
CHAR16 *b = NULL;
efi_status = get_file_size(fh2, &len);
if (EFI_ERROR(efi_status)) {
console_print(L"Could not get file size for \"%s\": %r\n",
fullpath, efi_status);
fh2->Close(fh2);
return efi_status;
}
if (len > 1024 * PAGE_SIZE) {
fh2->Close(fh2);
return EFI_BAD_BUFFER_SIZE;
}
b = AllocateZeroPool(len + 2);
if (!b) {
console_print(L"Could not allocate memory\n");
fh2->Close(fh2);
return EFI_OUT_OF_RESOURCES;
}
efi_status = fh->Read(fh, &len, b);
if (EFI_ERROR(efi_status)) {
FreePool(b);
fh2->Close(fh2);
console_print(L"Could not read file: %r\n", efi_status);
return efi_status;
}
*buffer = b;
*bs = len;
fh2->Close(fh2);
return EFI_SUCCESS;
}
EFI_STATUS
make_full_path(CHAR16 *dirname, CHAR16 *filename, CHAR16 **out, UINT64 *outlen)
{
UINT64 len;
len = StrLen(L"\\EFI\\") + StrLen(dirname)
+ StrLen(L"\\") + StrLen(filename)
+ 2;
CHAR16 *fullpath = AllocateZeroPool(len*sizeof(CHAR16));
if (!fullpath) {
console_print(L"Could not allocate memory\n");
return EFI_OUT_OF_RESOURCES;
}
StrCat(fullpath, L"\\EFI\\");
StrCat(fullpath, dirname);
StrCat(fullpath, L"\\");
StrCat(fullpath, filename);
*out = fullpath;
*outlen = len;
return EFI_SUCCESS;
}
CHAR16 *bootorder = NULL;
int nbootorder = 0;
EFI_DEVICE_PATH *first_new_option = NULL;
VOID *first_new_option_args = NULL;
UINTN first_new_option_size = 0;
EFI_STATUS
add_boot_option(EFI_DEVICE_PATH *hddp, EFI_DEVICE_PATH *fulldp,
CHAR16 *filename, CHAR16 *label, CHAR16 *arguments)
{
static int i = 0;
CHAR16 varname[] = L"Boot0000";
CHAR16 hexmap[] = L"0123456789ABCDEF";
EFI_STATUS efi_status;
for(; i <= 0xffff; i++) {
varname[4] = hexmap[(i & 0xf000) >> 12];
varname[5] = hexmap[(i & 0x0f00) >> 8];
varname[6] = hexmap[(i & 0x00f0) >> 4];
varname[7] = hexmap[(i & 0x000f) >> 0];
void *var = LibGetVariable(varname, &GV_GUID);
if (!var) {
int size = sizeof(UINT32) + sizeof (UINT16) +
StrLen(label)*2 + 2 + DevicePathSize(hddp) +
StrLen(arguments) * 2;
CHAR8 *data = AllocateZeroPool(size + 2);
CHAR8 *cursor = data;
*(UINT32 *)cursor = LOAD_OPTION_ACTIVE;
cursor += sizeof (UINT32);
*(UINT16 *)cursor = DevicePathSize(hddp);
cursor += sizeof (UINT16);
StrCpy((CHAR16 *)cursor, label);
cursor += StrLen(label)*2 + 2;
CopyMem(cursor, hddp, DevicePathSize(hddp));
cursor += DevicePathSize(hddp);
StrCpy((CHAR16 *)cursor, arguments);
VerbosePrint(L"Creating boot entry \"%s\" with label \"%s\" "
L"for file \"%s\"\n",
varname, label, filename);
if (!first_new_option) {
first_new_option = DuplicateDevicePath(fulldp);
first_new_option_args = arguments;
first_new_option_size = StrLen(arguments) * sizeof (CHAR16);
}
efi_status = RT->SetVariable(varname, &GV_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
size, data);
FreePool(data);
if (EFI_ERROR(efi_status)) {
console_print(L"Could not create variable: %r\n",
efi_status);
return efi_status;
}
CHAR16 *newbootorder = AllocateZeroPool(sizeof (CHAR16)
* (nbootorder + 1));
if (!newbootorder)
return EFI_OUT_OF_RESOURCES;
int j = 0;
newbootorder[0] = i & 0xffff;
if (nbootorder) {
for (j = 0; j < nbootorder; j++)
newbootorder[j+1] = bootorder[j];
FreePool(bootorder);
}
bootorder = newbootorder;
nbootorder += 1;
VerbosePrint(L"nbootorder: %d\nBootOrder: ",
nbootorder);
for (j = 0 ; j < nbootorder ; j++)
VerbosePrintUnprefixed(L"%04x ", bootorder[j]);
VerbosePrintUnprefixed(L"\n");
return EFI_SUCCESS;
}
}
return EFI_OUT_OF_RESOURCES;
}
/*
* AMI BIOS (e.g, Intel NUC5i3MYHE) may automatically hide and patch BootXXXX
* variables with ami_masked_device_path_guid. We can get the valid device path
* if just skipping it and its next end path.
*/
static EFI_GUID ami_masked_device_path_guid = {
0x99e275e7, 0x75a0, 0x4b37,
{ 0xa2, 0xe6, 0xc5, 0x38, 0x5e, 0x6c, 0x0, 0xcb }
};
static unsigned int
calc_masked_boot_option_size(unsigned int size)
{
return size + sizeof(EFI_DEVICE_PATH) +
sizeof(ami_masked_device_path_guid) + sizeof(EFI_DEVICE_PATH);
}
static int
check_masked_boot_option(CHAR8 *candidate, unsigned int candidate_size,
CHAR8 *data, unsigned int data_size)
{
/*
* The patched BootXXXX variables contain a hardware device path and
* an end path, preceding the real device path.
*/
if (calc_masked_boot_option_size(data_size) != candidate_size)
return 1;
CHAR8 *cursor = candidate;
/* Check whether the BootXXXX is patched */
cursor += sizeof(UINT32) + sizeof(UINT16);
cursor += StrSize((CHAR16 *)cursor);
unsigned int min_valid_size = cursor - candidate + sizeof(EFI_DEVICE_PATH);
if (candidate_size <= min_valid_size)
return 1;
EFI_DEVICE_PATH *dp = (EFI_DEVICE_PATH *)cursor;
unsigned int node_size = DevicePathNodeLength(dp) - sizeof(EFI_DEVICE_PATH);
min_valid_size += node_size;
if (candidate_size <= min_valid_size ||
DevicePathType(dp) != HARDWARE_DEVICE_PATH ||
DevicePathSubType(dp) != HW_VENDOR_DP ||
node_size != sizeof(ami_masked_device_path_guid) ||
CompareGuid((EFI_GUID *)(cursor + sizeof(EFI_DEVICE_PATH)),
&ami_masked_device_path_guid))
return 1;
/* Check whether the patched guid is followed by an end path */
min_valid_size += sizeof(EFI_DEVICE_PATH);
if (candidate_size <= min_valid_size)
return 1;
dp = NextDevicePathNode(dp);
if (!IsDevicePathEnd(dp))
return 1;
/*
* OK. We may really get a masked BootXXXX variable. The next
* step is to test whether it is hidden.
*/
UINT32 attrs = *(UINT32 *)candidate;
#ifndef LOAD_OPTION_HIDDEN
# define LOAD_OPTION_HIDDEN 0x00000008
#endif
if (!(attrs & LOAD_OPTION_HIDDEN))
return 1;
attrs &= ~LOAD_OPTION_HIDDEN;
/* Compare the field Attributes */
if (attrs != *(UINT32 *)data)
return 1;
/* Compare the field FilePathListLength */
data += sizeof(UINT32);
candidate += sizeof(UINT32);
if (calc_masked_boot_option_size(*(UINT16 *)data) !=
*(UINT16 *)candidate)
return 1;
/* Compare the field Description */
data += sizeof(UINT16);
candidate += sizeof(UINT16);
if (CompareMem(candidate, data, cursor - candidate))
return 1;
/* Compare the filed FilePathList */
cursor = (CHAR8 *)NextDevicePathNode(dp);
data += sizeof(UINT16);
data += StrSize((CHAR16 *)data);
return CompareMem(cursor, data, candidate_size - min_valid_size);
}
EFI_STATUS
find_boot_option(EFI_DEVICE_PATH *dp, EFI_DEVICE_PATH *fulldp,
CHAR16 *filename, CHAR16 *label, CHAR16 *arguments,
UINT16 *optnum)
{
unsigned int label_size = StrLen(label)*2 + 2;
unsigned int size = sizeof(UINT32) + sizeof (UINT16) +
label_size + DevicePathSize(dp) +
StrLen(arguments) * 2;
CHAR8 *data = AllocateZeroPool(size + 2);
if (!data)
return EFI_OUT_OF_RESOURCES;
CHAR8 *cursor = data;
*(UINT32 *)cursor = LOAD_OPTION_ACTIVE;
cursor += sizeof (UINT32);
*(UINT16 *)cursor = DevicePathSize(dp);
cursor += sizeof (UINT16);
StrCpy((CHAR16 *)cursor, label);
cursor += label_size;
CopyMem(cursor, dp, DevicePathSize(dp));
cursor += DevicePathSize(dp);
StrCpy((CHAR16 *)cursor, arguments);
EFI_STATUS efi_status;
EFI_GUID vendor_guid = NullGuid;
UINTN buffer_size = 256 * sizeof(CHAR16);
CHAR16 *varname = AllocateZeroPool(buffer_size);
if (!varname)
return EFI_OUT_OF_RESOURCES;
UINTN max_candidate_size = calc_masked_boot_option_size(size);
CHAR8 *candidate = AllocateZeroPool(max_candidate_size);
if (!candidate) {
FreePool(data);
return EFI_OUT_OF_RESOURCES;
}
while (1) {
UINTN varname_size = buffer_size;
efi_status = RT->GetNextVariableName(&varname_size, varname,
&vendor_guid);
if (EFI_ERROR(efi_status)) {
if (efi_status == EFI_BUFFER_TOO_SMALL) {
VerbosePrint(L"Buffer too small for next variable name, re-allocating it to be %d bytes and retrying\n",
varname_size);
varname = ReallocatePool(varname,
buffer_size,
varname_size);
if (!varname)
return EFI_OUT_OF_RESOURCES;
buffer_size = varname_size;
continue;
}
if (efi_status == EFI_DEVICE_ERROR)
VerbosePrint(L"The next variable name could not be retrieved due to a hardware error\n");
if (efi_status == EFI_INVALID_PARAMETER)
VerbosePrint(L"Invalid parameter to GetNextVariableName: varname_size=%d, varname=%s\n",
varname_size, varname);
/* EFI_NOT_FOUND means we listed all variables */
VerbosePrint(L"Checked all boot entries\n");
break;
}
if (StrLen(varname) != 8 || StrnCmp(varname, L"Boot", 4) ||
!isxdigit(varname[4]) || !isxdigit(varname[5]) ||
!isxdigit(varname[6]) || !isxdigit(varname[7]))
continue;
UINTN candidate_size = max_candidate_size;
efi_status = RT->GetVariable(varname, &GV_GUID, NULL,
&candidate_size, candidate);
if (EFI_ERROR(efi_status))
continue;
if (candidate_size != size) {
if (check_masked_boot_option(candidate, candidate_size,
data, size))
continue;
} else if (CompareMem(candidate, data, size))
continue;
VerbosePrint(L"Found boot entry \"%s\" with label \"%s\" "
L"for file \"%s\"\n", varname, label, filename);
/* at this point, we have duplicate data. */
if (!first_new_option) {
first_new_option = DuplicateDevicePath(fulldp);
first_new_option_args = arguments;
first_new_option_size = StrLen(arguments) * sizeof (CHAR16);
}
*optnum = xtoi(varname + 4);
FreePool(candidate);
FreePool(data);
return EFI_SUCCESS;
}
FreePool(candidate);
FreePool(data);
FreePool(varname);
return efi_status;
}
EFI_STATUS
set_boot_order(void)
{
CHAR16 *oldbootorder;
UINTN size;
oldbootorder = LibGetVariableAndSize(L"BootOrder", &GV_GUID, &size);
if (oldbootorder) {
int i;
nbootorder = size / sizeof (CHAR16);
bootorder = oldbootorder;
VerbosePrint(L"Original nbootorder: %d\nOriginal BootOrder: ",
nbootorder);
for (i = 0 ; i < nbootorder ; i++)
VerbosePrintUnprefixed(L"%04x ", bootorder[i]);
VerbosePrintUnprefixed(L"\n");
}
return EFI_SUCCESS;
}
EFI_STATUS
update_boot_order(void)
{
UINTN size;
UINTN len = 0;
CHAR16 *newbootorder = NULL;
EFI_STATUS efi_status;
size = nbootorder * sizeof(CHAR16);
newbootorder = AllocateZeroPool(size);
if (!newbootorder)
return EFI_OUT_OF_RESOURCES;
CopyMem(newbootorder, bootorder, size);
VerbosePrint(L"nbootorder: %d\nBootOrder: ", size / sizeof (CHAR16));
UINTN j;
for (j = 0 ; j < size / sizeof (CHAR16); j++)
VerbosePrintUnprefixed(L"%04x ", newbootorder[j]);
VerbosePrintUnprefixed(L"\n");
efi_status = RT->GetVariable(L"BootOrder", &GV_GUID, NULL, &len, NULL);
if (efi_status == EFI_BUFFER_TOO_SMALL)
LibDeleteVariable(L"BootOrder", &GV_GUID);
efi_status = RT->SetVariable(L"BootOrder", &GV_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
size, newbootorder);
FreePool(newbootorder);
return efi_status;
}
EFI_STATUS
add_to_boot_list(CHAR16 *dirname, CHAR16 *filename, CHAR16 *label, CHAR16 *arguments)
{
CHAR16 *fullpath = NULL;
UINT64 pathlen = 0;
EFI_STATUS efi_status;
efi_status = make_full_path(dirname, filename, &fullpath, &pathlen);
if (EFI_ERROR(efi_status))
return efi_status;
EFI_DEVICE_PATH *full_device_path = NULL;
EFI_DEVICE_PATH *dp = NULL;
CHAR16 *dps;
full_device_path = FileDevicePath(this_image->DeviceHandle, fullpath);
if (!full_device_path) {
efi_status = EFI_OUT_OF_RESOURCES;
goto done;
}
dps = DevicePathToStr(full_device_path);
VerbosePrint(L"file DP: %s\n", dps);
FreePool(dps);
efi_status = FindSubDevicePath(full_device_path,
MEDIA_DEVICE_PATH, MEDIA_HARDDRIVE_DP,
&dp);
if (EFI_ERROR(efi_status)) {
if (efi_status == EFI_NOT_FOUND) {
dp = full_device_path;
} else {
efi_status = EFI_OUT_OF_RESOURCES;
goto done;
}
}
{
UINTN s = DevicePathSize(dp);
UINTN i;
UINT8 *dpv = (void *)dp;
for (i = 0; i < s; i++) {
if (i % 16 == 0) {
if (i > 0)
VerbosePrintUnprefixed(L"\n");
VerbosePrint(L"");
}
VerbosePrintUnprefixed(L"%02x ", dpv[i]);
}
VerbosePrintUnprefixed(L"\n");
CHAR16 *dps = DevicePathToStr(dp);
VerbosePrint(L"device path: \"%s\"\n", dps);
FreePool(dps);
}
UINT16 option;
efi_status = find_boot_option(dp, full_device_path, fullpath, label,
arguments, &option);
if (EFI_ERROR(efi_status)) {
add_boot_option(dp, full_device_path, fullpath, label,
arguments);
goto done;
}
UINT16 bootnum;
CHAR16 *newbootorder;
/* Search for the option in the current bootorder */
for (bootnum = 0; bootnum < nbootorder; bootnum++)
if (bootorder[bootnum] == option)
break;
if (bootnum == nbootorder) {
/* Option not found, prepend option and copy the rest */
newbootorder = AllocateZeroPool(sizeof(CHAR16)
* (nbootorder + 1));
if (!newbootorder) {
efi_status = EFI_OUT_OF_RESOURCES;
goto done;
}
newbootorder[0] = option;
CopyMem(newbootorder + 1, bootorder,
sizeof(CHAR16) * nbootorder);
FreePool(bootorder);
bootorder = newbootorder;
nbootorder += 1;
} else {
/* Option found, put first and slice the rest */
newbootorder = AllocateZeroPool(
sizeof(CHAR16) * nbootorder);
if (!newbootorder) {
efi_status = EFI_OUT_OF_RESOURCES;
goto done;
}
newbootorder[0] = option;
CopyMem(newbootorder + 1, bootorder,
sizeof(CHAR16) * bootnum);
CopyMem(newbootorder + 1 + bootnum,
bootorder + bootnum + 1,
sizeof(CHAR16) * (nbootorder - bootnum - 1));
FreePool(bootorder);
bootorder = newbootorder;
}
VerbosePrint(L"New nbootorder: %d\nBootOrder: ",
nbootorder);
for (int i = 0 ; i < nbootorder ; i++)
VerbosePrintUnprefixed(L"%04x ", bootorder[i]);
VerbosePrintUnprefixed(L"\n");
done:
if (full_device_path)
FreePool(full_device_path);
if (dp && dp != full_device_path)
FreePool(dp);
if (fullpath)
FreePool(fullpath);
return efi_status;
}
EFI_STATUS
populate_stanza(CHAR16 *dirname, CHAR16 *filename UNUSED, CHAR16 *csv)
{
CHAR16 *file = csv;
VerbosePrint(L"CSV data: \"%s\"\n", csv);
UINTN comma0 = StrCSpn(csv, L",");
if (comma0 == 0)
return EFI_INVALID_PARAMETER;
file[comma0] = L'\0';
VerbosePrint(L"filename: \"%s\"\n", file);
CHAR16 *label = csv + comma0 + 1;
UINTN comma1 = StrCSpn(label, L",");
if (comma1 == 0)
return EFI_INVALID_PARAMETER;
label[comma1] = L'\0';
VerbosePrint(L"label: \"%s\"\n", label);
CHAR16 *arguments = csv + comma0 +1 + comma1 +1;
UINTN comma2 = StrCSpn(arguments, L",");
arguments[comma2] = L'\0';
/* This one is optional, so don't check if comma2 is 0 */
VerbosePrint(L"arguments: \"%s\"\n", arguments);
add_to_boot_list(dirname, file, label, arguments);
return EFI_SUCCESS;
}
EFI_STATUS
try_boot_csv(EFI_FILE_HANDLE fh, CHAR16 *dirname, CHAR16 *filename)
{
CHAR16 *fullpath = NULL;
UINT64 pathlen = 0;
EFI_STATUS efi_status;
efi_status = make_full_path(dirname, filename, &fullpath, &pathlen);
if (EFI_ERROR(efi_status))
return efi_status;
VerbosePrint(L"Found file \"%s\"\n", fullpath);
CHAR16 *buffer;
UINT64 bs;
efi_status = read_file(fh, fullpath, &buffer, &bs);
if (EFI_ERROR(efi_status)) {
console_print(L"Could not read file \"%s\": %r\n",
fullpath, efi_status);
FreePool(fullpath);
return efi_status;
}
FreePool(fullpath);
VerbosePrint(L"File looks like:\n%s\n", buffer);
CHAR16 *start = buffer;
/* The file may or may not start with the Unicode byte order marker.
* Sadness ensues. Since UEFI is defined as LE, I'm going to decree
* that these files must also be LE.
*
* IT IS THUS SO.
*
* But if we find the LE byte order marker, just skip it.
*/
if (*start == 0xfeff)
start++;
while (*start) {
while (*start == L'\r' || *start == L'\n')
start++;
UINTN l = StrCSpn(start, L"\r\n");
if (l == 0) {
if (start[l] == L'\0')
break;
start++;
continue;
}
CHAR16 c = start[l];
start[l] = L'\0';
populate_stanza(dirname, filename, start);
start[l] = c;
start += l;
}
FreePool(buffer);
return EFI_SUCCESS;
}
EFI_STATUS
find_boot_csv(EFI_FILE_HANDLE fh, CHAR16 *dirname)
{
EFI_STATUS efi_status;
void *buffer = NULL;
UINTN bs = 0;
/* The API here is "Call it once with bs=0, it fills in bs,
* then allocate a buffer and ask again to get it filled. */
efi_status = fh->GetInfo(fh, &EFI_FILE_INFO_GUID, &bs, NULL);
if (EFI_ERROR(efi_status) && efi_status != EFI_BUFFER_TOO_SMALL) {
console_print(L"Could not get directory info for \\EFI\\%s\\: %r\n",
dirname, efi_status);
return efi_status;
}
if (bs == 0)
return EFI_SUCCESS;
buffer = AllocateZeroPool(bs);
if (!buffer) {
console_print(L"Could not allocate memory\n");
return EFI_OUT_OF_RESOURCES;
}
efi_status = fh->GetInfo(fh, &EFI_FILE_INFO_GUID, &bs, buffer);
/* This checks *either* the error from the first GetInfo, if it isn't
* the EFI_BUFFER_TOO_SMALL we're expecting, or the second GetInfo
* call in *any* case. */
if (EFI_ERROR(efi_status)) {
console_print(L"Could not get info for \"%s\": %r\n", dirname,
efi_status);
if (buffer)
FreePool(buffer);
return efi_status;
}
EFI_FILE_INFO *fi = buffer;
if (!(fi->Attribute & EFI_FILE_DIRECTORY)) {
FreePool(buffer);
return EFI_SUCCESS;
}
FreePool(buffer);
buffer = NULL;
CHAR16 *bootcsv=NULL, *bootarchcsv=NULL;
bs = 0;
do {
bs = 0;
efi_status = fh->Read(fh, &bs, NULL);
if (EFI_ERROR(efi_status) &&
efi_status != EFI_BUFFER_TOO_SMALL) {
console_print(L"Could not read \\EFI\\%s\\: %r\n",
dirname, efi_status);
return efi_status;
}
/* If there's no data to read, don't try to allocate 0 bytes
* and read the data... */
if (bs == 0)
break;
buffer = AllocateZeroPool(bs);
if (!buffer) {
console_print(L"Could not allocate memory\n");
return EFI_OUT_OF_RESOURCES;
}
efi_status = fh->Read(fh, &bs, buffer);
if (EFI_ERROR(efi_status)) {
console_print(L"Could not read \\EFI\\%s\\: %r\n",
dirname, efi_status);
FreePool(buffer);
return efi_status;
}
if (bs == 0)
break;
fi = buffer;
if (!bootcsv && !StrCaseCmp(fi->FileName, L"boot.csv"))
bootcsv = StrDuplicate(fi->FileName);
if (!bootarchcsv &&
!StrCaseCmp(fi->FileName, L"boot" EFI_ARCH L".csv"))
bootarchcsv = StrDuplicate(fi->FileName);
FreePool(buffer);
buffer = NULL;
} while (bs != 0);
efi_status = EFI_SUCCESS;
if (bootarchcsv) {
EFI_FILE_HANDLE fh2;
efi_status = fh->Open(fh, &fh2, bootarchcsv,
EFI_FILE_READ_ONLY, 0);
if (EFI_ERROR(efi_status) || fh2 == NULL) {
console_print(L"Couldn't open \\EFI\\%s\\%s: %r\n",
dirname, bootarchcsv, efi_status);
} else {
efi_status = try_boot_csv(fh2, dirname, bootarchcsv);
fh2->Close(fh2);
if (EFI_ERROR(efi_status))
console_print(L"Could not process \\EFI\\%s\\%s: %r\n",
dirname, bootarchcsv, efi_status);
}
}
if ((EFI_ERROR(efi_status) || !bootarchcsv) && bootcsv) {
EFI_FILE_HANDLE fh2;
efi_status = fh->Open(fh, &fh2, bootcsv,
EFI_FILE_READ_ONLY, 0);
if (EFI_ERROR(efi_status) || fh2 == NULL) {
console_print(L"Couldn't open \\EFI\\%s\\%s: %r\n",
dirname, bootcsv, efi_status);
} else {
efi_status = try_boot_csv(fh2, dirname, bootcsv);
fh2->Close(fh2);
if (EFI_ERROR(efi_status))
console_print(L"Could not process \\EFI\\%s\\%s: %r\n",
dirname, bootarchcsv, efi_status);
}
}
return EFI_SUCCESS;
}
EFI_STATUS
find_boot_options(EFI_HANDLE device)
{
EFI_STATUS efi_status;
EFI_FILE_IO_INTERFACE *fio = NULL;
efi_status = BS->HandleProtocol(device, &FileSystemProtocol,
(void **) &fio);
if (EFI_ERROR(efi_status)) {
console_print(L"Couldn't find file system: %r\n", efi_status);
return efi_status;
}
/* EFI_FILE_HANDLE is a pointer to an EFI_FILE, and I have
* *no idea* what frees the memory allocated here. Hopefully
* Close() does. */
EFI_FILE_HANDLE fh = NULL;
efi_status = fio->OpenVolume(fio, &fh);
if (EFI_ERROR(efi_status) || fh == NULL) {
console_print(L"Couldn't open file system: %r\n", efi_status);
return efi_status;
}
EFI_FILE_HANDLE fh2 = NULL;
efi_status = fh->Open(fh, &fh2, L"EFI", EFI_FILE_READ_ONLY, 0);
if (EFI_ERROR(efi_status) || fh2 == NULL) {
console_print(L"Couldn't open EFI: %r\n", efi_status);
fh->Close(fh);
return efi_status;
}
efi_status = fh2->SetPosition(fh2, 0);
if (EFI_ERROR(efi_status)) {
console_print(L"Couldn't set file position: %r\n", efi_status);
fh2->Close(fh2);
fh->Close(fh);
return efi_status;
}
void *buffer;
UINTN bs;
do {
bs = 0;
efi_status = fh2->Read(fh2, &bs, NULL);
if (EFI_ERROR(efi_status) && efi_status != EFI_BUFFER_TOO_SMALL) {
console_print(L"Could not read \\EFI\\: %r\n", efi_status);
return efi_status;
}
if (bs == 0)
break;
buffer = AllocateZeroPool(bs);
if (!buffer) {
console_print(L"Could not allocate memory\n");
/* sure, this might work, why not? */
fh2->Close(fh2);
fh->Close(fh);
return EFI_OUT_OF_RESOURCES;
}
efi_status = fh2->Read(fh2, &bs, buffer);
if (EFI_ERROR(efi_status)) {
if (buffer) {
FreePool(buffer);
buffer = NULL;
}
fh2->Close(fh2);
fh->Close(fh);
return efi_status;
}
EFI_FILE_INFO *fi = buffer;
if (!(fi->Attribute & EFI_FILE_DIRECTORY)) {
FreePool(buffer);
buffer = NULL;
continue;
}
if (!StrCmp(fi->FileName, L".") ||
!StrCmp(fi->FileName, L"..") ||
!StrCaseCmp(fi->FileName, L"BOOT")) {
FreePool(buffer);
buffer = NULL;
continue;
}
VerbosePrint(L"Found directory named \"%s\"\n", fi->FileName);
EFI_FILE_HANDLE fh3;
efi_status = fh2->Open(fh2, &fh3, fi->FileName,
EFI_FILE_READ_ONLY, 0);
if (EFI_ERROR(efi_status)) {
console_print(L"%d Couldn't open %s: %r\n", __LINE__,
fi->FileName, efi_status);
FreePool(buffer);
buffer = NULL;
continue;
}
efi_status = find_boot_csv(fh3, fi->FileName);
fh3->Close(fh3);
FreePool(buffer);
buffer = NULL;
if (efi_status == EFI_OUT_OF_RESOURCES)
break;
} while (1);
if (!EFI_ERROR(efi_status) && nbootorder > 0)
efi_status = update_boot_order();
fh2->Close(fh2);
fh->Close(fh);
return efi_status;
}
static EFI_STATUS
try_start_first_option(EFI_HANDLE parent_image_handle)