[U-Boot] [PATCH v3 04/18] efi_loader: fix efi_convert_device_node_to_text
Heinrich Schuchardt
xypron.glpk at gmx.de
Sun Nov 26 13:05:09 UTC 2017
We need to implement to different functions for the
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL:
ConvertDeviceNodeToText
ConvertDevicePathToText
A recent patch screwed up efi_convert_device_node_to_text
to expect a device path and not a node.
The patch makes both service functions work again.
efi_convert_device_node_to_text is renamed to
efi_convert_single_device_node_to_text and
efi_convert_device_node_to_text_ext is renamed to
efi_convert_device_node_to_text to avoid future
confusion.
A test of ConvertDeviceNodeToText will be provided in
a follow-up patch.
Fixes: adae4313cdd efi_loader: flesh out device-path to text
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
v3
Correctly handle NULL values.
v2
no change
---
lib/efi_loader/efi_device_path_to_text.c | 154 ++++++++++++++++++-------------
1 file changed, 88 insertions(+), 66 deletions(-)
diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c
index ad248cb492..43af5dfd8d 100644
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -12,12 +12,31 @@
#define MAC_OUTPUT_LEN 22
#define UNKNOWN_OUTPUT_LEN 23
+#define MAX_NODE_LEN 512
+#define MAX_PATH_LEN 1024
+
const efi_guid_t efi_guid_device_path_to_text_protocol =
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
+static u16 *efi_str_to_u16(char *str)
+{
+ efi_uintn_t len;
+ u16 *out;
+ efi_status_t ret;
+
+ len = strlen(str) + 1;
+ ret = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, len * sizeof(u16),
+ (void **)&out);
+ if (ret != EFI_SUCCESS)
+ return NULL;
+ ascii2unicode(out, str);
+ out[len - 1] = 0;
+ return out;
+}
+
static char *dp_unknown(char *s, struct efi_device_path *dp)
{
- s += sprintf(s, "/UNKNOWN(%04x,%04x)", dp->type, dp->sub_type);
+ s += sprintf(s, "UNKNOWN(%04x,%04x)", dp->type, dp->sub_type);
return s;
}
@@ -27,7 +46,7 @@ static char *dp_hardware(char *s, struct efi_device_path *dp)
case DEVICE_PATH_SUB_TYPE_MEMORY: {
struct efi_device_path_memory *mdp =
(struct efi_device_path_memory *)dp;
- s += sprintf(s, "/MemoryMapped(0x%x,0x%llx,0x%llx)",
+ s += sprintf(s, "MemoryMapped(0x%x,0x%llx,0x%llx)",
mdp->memory_type,
mdp->start_address,
mdp->end_address);
@@ -36,7 +55,7 @@ static char *dp_hardware(char *s, struct efi_device_path *dp)
case DEVICE_PATH_SUB_TYPE_VENDOR: {
struct efi_device_path_vendor *vdp =
(struct efi_device_path_vendor *)dp;
- s += sprintf(s, "/VenHw(%pUl)", &vdp->guid);
+ s += sprintf(s, "VenHw(%pUl)", &vdp->guid);
break;
}
default:
@@ -52,7 +71,7 @@ static char *dp_acpi(char *s, struct efi_device_path *dp)
case DEVICE_PATH_SUB_TYPE_ACPI_DEVICE: {
struct efi_device_path_acpi_path *adp =
(struct efi_device_path_acpi_path *)dp;
- s += sprintf(s, "/Acpi(PNP%04x", EISA_PNP_NUM(adp->hid));
+ s += sprintf(s, "Acpi(PNP%04x", EISA_PNP_NUM(adp->hid));
if (adp->uid)
s += sprintf(s, ",%d", adp->uid);
s += sprintf(s, ")");
@@ -71,7 +90,7 @@ static char *dp_msging(char *s, struct efi_device_path *dp)
case DEVICE_PATH_SUB_TYPE_MSG_USB: {
struct efi_device_path_usb *udp =
(struct efi_device_path_usb *)dp;
- s += sprintf(s, "/Usb(0x%x,0x%x)", udp->parent_port_number,
+ s += sprintf(s, "Usb(0x%x,0x%x)", udp->parent_port_number,
udp->usb_interface);
break;
}
@@ -82,7 +101,7 @@ static char *dp_msging(char *s, struct efi_device_path *dp)
if (mdp->if_type != 0 && mdp->if_type != 1)
break;
- s += sprintf(s, "/MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
+ s += sprintf(s, "MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
mdp->mac.addr[0], mdp->mac.addr[1],
mdp->mac.addr[2], mdp->mac.addr[3],
mdp->mac.addr[4], mdp->mac.addr[5],
@@ -94,7 +113,7 @@ static char *dp_msging(char *s, struct efi_device_path *dp)
struct efi_device_path_usb_class *ucdp =
(struct efi_device_path_usb_class *)dp;
- s += sprintf(s, "/USBClass(%x,%x,%x,%x,%x)",
+ s += sprintf(s, "USBClass(%x,%x,%x,%x,%x)",
ucdp->vendor_id, ucdp->product_id,
ucdp->device_class, ucdp->device_subclass,
ucdp->device_protocol);
@@ -108,7 +127,7 @@ static char *dp_msging(char *s, struct efi_device_path *dp)
"SDCard" : "MMC";
struct efi_device_path_sd_mmc_path *sddp =
(struct efi_device_path_sd_mmc_path *)dp;
- s += sprintf(s, "/%s(Slot%u)", typename, sddp->slot_number);
+ s += sprintf(s, "%s(Slot%u)", typename, sddp->slot_number);
break;
}
default:
@@ -128,15 +147,15 @@ static char *dp_media(char *s, struct efi_device_path *dp)
switch (hddp->signature_type) {
case SIG_TYPE_MBR:
- s += sprintf(s, "/HD(Part%d,Sig%08x)",
+ s += sprintf(s, "HD(Part%d,Sig%08x)",
hddp->partition_number,
*(uint32_t *)sig);
break;
case SIG_TYPE_GUID:
- s += sprintf(s, "/HD(Part%d,Sig%pUl)",
+ s += sprintf(s, "HD(Part%d,Sig%pUl)",
hddp->partition_number, sig);
default:
- s += sprintf(s, "/HD(Part%d,MBRType=%02x,SigType=%02x)",
+ s += sprintf(s, "HD(Part%d,MBRType=%02x,SigType=%02x)",
hddp->partition_number, hddp->partmap_type,
hddp->signature_type);
}
@@ -146,14 +165,16 @@ static char *dp_media(char *s, struct efi_device_path *dp)
case DEVICE_PATH_SUB_TYPE_CDROM_PATH: {
struct efi_device_path_cdrom_path *cddp =
(struct efi_device_path_cdrom_path *)dp;
- s += sprintf(s, "/CDROM(0x%x)", cddp->boot_entry);
+ s += sprintf(s, "CDROM(0x%x)", cddp->boot_entry);
break;
}
case DEVICE_PATH_SUB_TYPE_FILE_PATH: {
struct efi_device_path_file_path *fp =
(struct efi_device_path_file_path *)dp;
int slen = (dp->length - sizeof(*dp)) / 2;
- s += sprintf(s, "/%-.*ls", slen, fp->str);
+ if (slen > MAX_NODE_LEN - 2)
+ slen = MAX_NODE_LEN - 2;
+ s += sprintf(s, "%-.*ls", slen, fp->str);
break;
}
default:
@@ -163,65 +184,59 @@ static char *dp_media(char *s, struct efi_device_path *dp)
return s;
}
-static uint16_t *efi_convert_device_node_to_text(
- struct efi_device_path *dp,
- bool display_only,
- bool allow_shortcuts)
+/*
+ * Converts a single node to a char string.
+ *
+ * @buffer output buffer
+ * @dp device path or node
+ * @return end of string
+ */
+static char *efi_convert_single_device_node_to_text(
+ char *buffer,
+ struct efi_device_path *dp)
{
- unsigned long len;
- efi_status_t r;
- char buf[512]; /* this ought be be big enough for worst case */
- char *str = buf;
- uint16_t *out;
-
- while (dp) {
- switch (dp->type) {
- case DEVICE_PATH_TYPE_HARDWARE_DEVICE:
- str = dp_hardware(str, dp);
- break;
- case DEVICE_PATH_TYPE_ACPI_DEVICE:
- str = dp_acpi(str, dp);
- break;
- case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
- str = dp_msging(str, dp);
- break;
- case DEVICE_PATH_TYPE_MEDIA_DEVICE:
- str = dp_media(str, dp);
- break;
- default:
- str = dp_unknown(str, dp);
- }
+ char *str = buffer;
- dp = efi_dp_next(dp);
+ switch (dp->type) {
+ case DEVICE_PATH_TYPE_HARDWARE_DEVICE:
+ str = dp_hardware(str, dp);
+ break;
+ case DEVICE_PATH_TYPE_ACPI_DEVICE:
+ str = dp_acpi(str, dp);
+ break;
+ case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
+ str = dp_msging(str, dp);
+ break;
+ case DEVICE_PATH_TYPE_MEDIA_DEVICE:
+ str = dp_media(str, dp);
+ break;
+ default:
+ str = dp_unknown(str, dp);
}
- *str++ = '\0';
-
- len = str - buf;
- r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, 2 * len, (void **)&out);
- if (r != EFI_SUCCESS)
- return NULL;
-
- ascii2unicode(out, buf);
- out[len - 1] = 0;
-
- return out;
+ *str = '\0';
+ return str;
}
-static uint16_t EFIAPI *efi_convert_device_node_to_text_ext(
+static uint16_t EFIAPI *efi_convert_device_node_to_text(
struct efi_device_path *device_node,
bool display_only,
bool allow_shortcuts)
{
- uint16_t *buffer;
+ char str[MAX_NODE_LEN];
+ uint16_t *text = NULL;
EFI_ENTRY("%p, %d, %d", device_node, display_only, allow_shortcuts);
- buffer = efi_convert_device_node_to_text(device_node, display_only,
- allow_shortcuts);
+ if (!device_node)
+ goto out;
+ efi_convert_single_device_node_to_text(str, device_node);
+
+ text = efi_str_to_u16(str);
+out:
EFI_EXIT(EFI_SUCCESS);
- return buffer;
+ return text;
}
static uint16_t EFIAPI *efi_convert_device_path_to_text(
@@ -229,19 +244,26 @@ static uint16_t EFIAPI *efi_convert_device_path_to_text(
bool display_only,
bool allow_shortcuts)
{
- uint16_t *buffer;
+ uint16_t *text = NULL;
+ char buffer[MAX_PATH_LEN];
+ char *str = buffer;
EFI_ENTRY("%p, %d, %d", device_path, display_only, allow_shortcuts);
- /*
- * Our device paths are all of depth one. So its is sufficient to
- * to convert the first node.
- */
- buffer = efi_convert_device_node_to_text(device_path, display_only,
- allow_shortcuts);
+ if (!device_path)
+ goto out;
+ while (device_path &&
+ str + MAX_NODE_LEN < buffer + MAX_PATH_LEN) {
+ *str++ = '/';
+ str = efi_convert_single_device_node_to_text(str, device_path);
+ device_path = efi_dp_next(device_path);
+ }
+
+ text = efi_str_to_u16(buffer);
+out:
EFI_EXIT(EFI_SUCCESS);
- return buffer;
+ return text;
}
/* helper for debug prints.. efi_free_pool() the result. */
@@ -251,6 +273,6 @@ uint16_t *efi_dp_str(struct efi_device_path *dp)
}
const struct efi_device_path_to_text_protocol efi_device_path_to_text = {
- .convert_device_node_to_text = efi_convert_device_node_to_text_ext,
+ .convert_device_node_to_text = efi_convert_device_node_to_text,
.convert_device_path_to_text = efi_convert_device_path_to_text,
};
--
2.14.2
More information about the U-Boot
mailing list