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efi_loader: find distro device-path for media devices

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The auto-generated load options for media device do not contain a partition
node. We cannot expect the simple file protocol here.

Get the partition device-path via the loaded image protocol.

Fixes: e91b68fd6b ("efi_loader: load distro dtb in bootmgr")
Reported-by: E Shattow <lucent@gmail.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Tested-by: E Shattow <lucent@gmail.com>
This commit is contained in:
Heinrich Schuchardt 2024-07-13 13:30:29 +02:00
parent 7aab2b6c1f
commit 5c1b5e6bc5
3 changed files with 22 additions and 17 deletions
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2
include/efi_loader.h
View file

@ -1195,6 +1195,6 @@ efi_status_t efi_load_option_dp_join(struct efi_device_path **dp,
int efi_get_distro_fdt_name(char *fname, int size, int seq);
void efi_load_distro_fdt(void **fdt, efi_uintn_t *fdt_size);
void efi_load_distro_fdt(efi_handle_t handle, void **fdt, efi_uintn_t *fdt_size);
#endif /* _EFI_LOADER_H */

2
lib/efi_loader/efi_bootmgr.c
View file

@ -1277,7 +1277,7 @@ efi_status_t efi_bootmgr_run(void *fdt)
if (fdt_lo)
fdt = fdt_lo;
if (!fdt) {
efi_load_distro_fdt(&fdt_distro, &fdt_size);
efi_load_distro_fdt(handle, &fdt_distro, &fdt_size);
fdt = fdt_distro;
}
}

35
lib/efi_loader/efi_fdt.c
View file

@ -75,28 +75,34 @@ int efi_get_distro_fdt_name(char *fname, int size, int seq)
/**
* efi_load_distro_fdt() - load distro device-tree
*
* @handle: handle of loaded image
* @fdt: on return device-tree, must be freed via efi_free_pages()
* @fdt_size: buffer size
*/
void efi_load_distro_fdt(void **fdt, efi_uintn_t *fdt_size)
void efi_load_distro_fdt(efi_handle_t handle, void **fdt, efi_uintn_t *fdt_size)
{
struct efi_device_path *rem, *dp;
struct efi_device_path *dp;
efi_status_t ret;
struct efi_handler *handler;
struct efi_loaded_image *loaded_image;
efi_handle_t device;
*fdt = NULL;
dp = efi_get_dp_from_boot(NULL);
if (!dp)
return;
device = efi_dp_find_obj(dp, NULL, &rem);
ret = efi_search_protocol(device, &efi_simple_file_system_protocol_guid,
NULL);
/* Get boot device from loaded image protocol */
ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
if (ret != EFI_SUCCESS)
goto err;
memcpy(rem, &END, sizeof(END));
return;
loaded_image = handler->protocol_interface;
device = loaded_image->device_handle;
/* try the various available names */
/* Get device path of boot device */
ret = efi_search_protocol(device, &efi_guid_device_path, &handler);
if (ret != EFI_SUCCESS)
return;
dp = handler->protocol_interface;
/* Try the various available names */
for (int seq = 0; ; ++seq) {
struct efi_device_path *file;
char buf[255];
@ -108,10 +114,9 @@ void efi_load_distro_fdt(void **fdt, efi_uintn_t *fdt_size)
break;
ret = efi_load_image_from_path(true, file, fdt, fdt_size);
efi_free_pool(file);
if (ret == EFI_SUCCESS)
if (ret == EFI_SUCCESS) {
log_debug("Fdt %pD loaded\n", file);
break;
}
}
err:
efi_free_pool(dp);
}