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Move loaded_image implementation to helpers module

This commit is contained in:
Julian Stecklina 2022-11-23 11:29:40 +01:00
parent 8f58633d84
commit 8f2f11aa1b
2 changed files with 46 additions and 33 deletions
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37
rust/lanzaboote/src/main.rs
View File

@ -22,7 +22,11 @@ use uefi::{
Result, Result,
}; };
use crate::{linux_loader::InitrdLoader, pe_section::pe_section, uefi_helpers::read_all}; use crate::{
linux_loader::InitrdLoader,
pe_section::pe_section,
uefi_helpers::{booted_image_file, read_all},
};
fn print_logo(output: &mut Output) { fn print_logo(output: &mut Output) {
output.clear().unwrap(); output.clear().unwrap();
@ -42,35 +46,6 @@ fn print_logo(output: &mut Output) {
.unwrap(); .unwrap();
} }
fn image_file(boot_services: &BootServices) -> Result<RegularFile> {
let mut file_system = boot_services.get_image_file_system(boot_services.image_handle())?;
// The root directory of the volume where our binary lies.
let mut root = file_system.open_volume()?;
let loaded_image =
boot_services.open_protocol_exclusive::<LoadedImage>(boot_services.image_handle())?;
let file_path = loaded_image.file_path().ok_or(Status::NOT_FOUND)?;
let to_text = boot_services.open_protocol_exclusive::<DevicePathToText>(
boot_services.get_handle_for_protocol::<DevicePathToText>()?,
)?;
let file_path = to_text.convert_device_path_to_text(
boot_services,
file_path,
DisplayOnly(false),
AllowShortcuts(false),
)?;
let our_image = root.open(&file_path, FileMode::Read, FileAttribute::empty())?;
Ok(our_image
.into_regular_file()
.ok_or(Status::INVALID_PARAMETER)?)
}
#[entry] #[entry]
fn main(handle: Handle, mut system_table: SystemTable<Boot>) -> Status { fn main(handle: Handle, mut system_table: SystemTable<Boot>) -> Status {
uefi_services::init(&mut system_table).unwrap(); uefi_services::init(&mut system_table).unwrap();
@ -80,7 +55,7 @@ fn main(handle: Handle, mut system_table: SystemTable<Boot>) -> Status {
let boot_services = system_table.boot_services(); let boot_services = system_table.boot_services();
{ {
let image_data = read_all(&mut image_file(boot_services).unwrap()).unwrap(); let image_data = read_all(&mut booted_image_file(boot_services).unwrap()).unwrap();
if let Some(data) = pe_section(&image_data, ".osrel") { if let Some(data) = pe_section(&image_data, ".osrel") {
info!("osrel = {}", core::str::from_utf8(data).unwrap_or("???")) info!("osrel = {}", core::str::from_utf8(data).unwrap_or("???"))

42
rust/lanzaboote/src/uefi_helpers.rs
View File

@ -1,7 +1,15 @@
use alloc::vec::Vec; use alloc::vec::Vec;
use uefi::{proto::media::file::RegularFile, Result}; use uefi::{
prelude::BootServices,
proto::{
device_path::text::{AllowShortcuts, DevicePathToText, DisplayOnly},
loaded_image::LoadedImage,
media::file::{File, FileAttribute, FileMode, RegularFile},
},
Result, Status,
};
// Read the whole file into a vector. /// Read the whole file into a vector.
pub fn read_all(file: &mut RegularFile) -> Result<Vec<u8>> { pub fn read_all(file: &mut RegularFile) -> Result<Vec<u8>> {
let mut buf = Vec::new(); let mut buf = Vec::new();
@ -18,3 +26,33 @@ pub fn read_all(file: &mut RegularFile) -> Result<Vec<u8>> {
Ok(buf) Ok(buf)
} }
/// Open the currently executing image as a file.
pub fn booted_image_file(boot_services: &BootServices) -> Result<RegularFile> {
let mut file_system = boot_services.get_image_file_system(boot_services.image_handle())?;
// The root directory of the volume where our binary lies.
let mut root = file_system.open_volume()?;
let loaded_image =
boot_services.open_protocol_exclusive::<LoadedImage>(boot_services.image_handle())?;
let file_path = loaded_image.file_path().ok_or(Status::NOT_FOUND)?;
let to_text = boot_services.open_protocol_exclusive::<DevicePathToText>(
boot_services.get_handle_for_protocol::<DevicePathToText>()?,
)?;
let file_path = to_text.convert_device_path_to_text(
boot_services,
file_path,
DisplayOnly(false),
AllowShortcuts(false),
)?;
let our_image = root.open(&file_path, FileMode::Read, FileAttribute::empty())?;
Ok(our_image
.into_regular_file()
.ok_or(Status::INVALID_PARAMETER)?)
}