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lanzaboote: safe-ize root directory finding using exts feature

This commit is contained in:
Raito Bezarius 2022-11-22 02:24:38 +01:00
parent aada596b8c
commit 50b39a3b8f
2 changed files with 3 additions and 43 deletions
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2
rust/lanzaboote/Cargo.toml
View File

@ -5,7 +5,7 @@ edition = "2021"
publish = false
[dependencies]
uefi = { version = "0.18.0", features = [ "alloc", "logger" ] }
uefi = { version = "0.18.0", features = [ "alloc", "logger", "exts" ] }
uefi-services = "0.15.0"
log = "0.4.17"
ed25519-compact = { version = "2.0.2", default-features = false, features = [] }

44
rust/lanzaboote/src/main.rs
View File

@ -39,47 +39,6 @@ fn print_logo(output: &mut Output) {
.unwrap();
}
// Find the root directory of the given image.
//
// # Safety
//
// TODO Need to find out whether we can open the protocols in safe code.
unsafe fn root_directory(image: Handle, boot_services: &BootServices) -> Result<Directory> {
let loaded_image = boot_services.open_protocol::<LoadedImage>(
OpenProtocolParams {
handle: image,
agent: image,
controller: None,
},
OpenProtocolAttributes::Exclusive,
)?;
let device_handle = loaded_image.device();
let device_path = boot_services.open_protocol::<DevicePath>(
OpenProtocolParams {
handle: device_handle,
agent: image,
controller: None,
},
OpenProtocolAttributes::Exclusive,
)?;
let mut device_path: &DevicePath = device_path.deref();
let fs_handle = boot_services.locate_device_path::<SimpleFileSystem>(&mut device_path)?;
let mut file_system = boot_services.open_protocol::<SimpleFileSystem>(
OpenProtocolParams {
handle: fs_handle,
agent: image,
controller: None,
},
OpenProtocolAttributes::Exclusive,
)?;
file_system.open_volume()
}
fn read_all(image: &mut RegularFile) -> Result<Vec<u8>> {
let mut buf = Vec::new();
@ -105,7 +64,8 @@ fn main(handle: Handle, mut system_table: SystemTable<Boot>) -> Status {
print_logo(system_table.stdout());
let boot_services = system_table.boot_services();
let mut root = unsafe { root_directory(handle, boot_services).unwrap() };
let mut file_system = boot_services.get_image_file_system(handle).unwrap();
let mut root = file_system.open_volume().unwrap();
debug!("Found root");