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efi_loader: unload applications upon Exit()

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Implement unloading of images in the Exit() boot services:

* unload images that are not yet started,
* unload started applications,
* unload drivers returning an error.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-05-01 20:07:04 +02:00
parent df116e81ea
commit 126a43f15b
3 changed files with 33 additions and 6 deletions
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1
include/efi_loader.h
View file

@ -234,6 +234,7 @@ struct efi_loaded_image_obj {
struct jmp_buf_data exit_jmp;
EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
struct efi_system_table *st);
u16 image_type;
};
/**

36
lib/efi_loader/efi_boottime.c
View file

@ -13,6 +13,7 @@
#include <linux/libfdt_env.h>
#include <u-boot/crc.h>
#include <bootm.h>
#include <pe.h>
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
@ -2798,7 +2799,7 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
* image protocol.
*/
efi_status_t ret;
void *info;
struct efi_loaded_image *loaded_image_protocol;
struct efi_loaded_image_obj *image_obj =
(struct efi_loaded_image_obj *)image_handle;
@ -2806,13 +2807,33 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
exit_data_size, exit_data);
/* Check parameters */
if (image_handle != current_image)
goto out;
ret = EFI_CALL(efi_open_protocol(image_handle, &efi_guid_loaded_image,
&info, NULL, NULL,
(void **)&loaded_image_protocol,
NULL, NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL));
if (ret != EFI_SUCCESS)
if (ret != EFI_SUCCESS) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
/* Unloading of unstarted images */
switch (image_obj->header.type) {
case EFI_OBJECT_TYPE_STARTED_IMAGE:
break;
case EFI_OBJECT_TYPE_LOADED_IMAGE:
efi_delete_image(image_obj, loaded_image_protocol);
ret = EFI_SUCCESS;
goto out;
default:
/* Handle does not refer to loaded image */
ret = EFI_INVALID_PARAMETER;
goto out;
}
/* A started image can only be unloaded it is the last one started. */
if (image_handle != current_image) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
/* Exit data is only foreseen in case of failure. */
if (exit_status != EFI_SUCCESS) {
@ -2822,6 +2843,9 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
if (ret != EFI_SUCCESS)
EFI_PRINT("%s: out of memory\n", __func__);
}
if (image_obj->image_type == IMAGE_SUBSYSTEM_EFI_APPLICATION ||
exit_status != EFI_SUCCESS)
efi_delete_image(image_obj, loaded_image_protocol);
/* Make sure entry/exit counts for EFI world cross-overs match */
EFI_EXIT(exit_status);
@ -2837,7 +2861,7 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
panic("EFI application exited");
out:
return EFI_EXIT(EFI_INVALID_PARAMETER);
return EFI_EXIT(ret);
}
/**

2
lib/efi_loader/efi_image_loader.c
View file

@ -273,6 +273,7 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
image_base = opt->ImageBase;
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
handle->image_type = opt->Subsystem;
efi_reloc = efi_alloc(virt_size,
loaded_image_info->image_code_type);
if (!efi_reloc) {
@ -288,6 +289,7 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
image_base = opt->ImageBase;
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
handle->image_type = opt->Subsystem;
efi_reloc = efi_alloc(virt_size,
loaded_image_info->image_code_type);
if (!efi_reloc) {