mirror of
https://chromium.googlesource.com/crosvm/crosvm
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1dab58a2cf
This search/replace updates all copyright notices to drop the "All rights reserved", Use "ChromiumOS" instead of "Chromium OS" and drops the trailing dots. This fulfills the request from legal and unifies our notices. ./tools/health-check has been updated to only accept this style. BUG=b:246579983 TEST=./tools/health-check Change-Id: I87a80701dc651f1baf4820e5cc42469d7c5f5bf7 Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3894243 Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Dennis Kempin <denniskempin@google.com>
92 lines
2.6 KiB
Rust
92 lines
2.6 KiB
Rust
// Copyright 2019 The ChromiumOS Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Loader for bzImage-format Linux kernels as described in
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// https://www.kernel.org/doc/Documentation/x86/boot.txt
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use std::io::Read;
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use std::io::Seek;
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use std::io::SeekFrom;
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use base::AsRawDescriptor;
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use data_model::DataInit;
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use remain::sorted;
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use thiserror::Error;
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use vm_memory::GuestAddress;
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use vm_memory::GuestMemory;
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use crate::bootparam::boot_params;
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#[sorted]
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#[derive(Error, Debug, PartialEq)]
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pub enum Error {
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#[error("bad kernel header signature")]
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BadSignature,
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#[error("invalid setup_sects value")]
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InvalidSetupSects,
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#[error("invalid syssize value")]
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InvalidSysSize,
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#[error("unable to read boot_params")]
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ReadBootParams,
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#[error("unable to read kernel image")]
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ReadKernelImage,
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#[error("unable to seek to boot_params")]
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SeekBootParams,
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#[error("unable to seek to kernel start")]
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SeekKernelStart,
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}
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pub type Result<T> = std::result::Result<T, Error>;
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/// Loads a kernel from a bzImage to a slice
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///
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/// # Arguments
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///
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/// * `guest_mem` - The guest memory region the kernel is written to.
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/// * `kernel_start` - The offset into `guest_mem` at which to load the kernel.
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/// * `kernel_image` - Input bzImage.
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pub fn load_bzimage<F>(
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guest_mem: &GuestMemory,
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kernel_start: GuestAddress,
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mut kernel_image: &mut F,
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) -> Result<(boot_params, u64)>
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where
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F: Read + Seek + AsRawDescriptor,
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{
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kernel_image
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.seek(SeekFrom::Start(0))
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.map_err(|_| Error::SeekBootParams)?;
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let params = boot_params::from_reader(&mut kernel_image).map_err(|_| Error::ReadBootParams)?;
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// bzImage header signature "HdrS"
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if params.hdr.header != 0x53726448 {
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return Err(Error::BadSignature);
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}
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let setup_sects = if params.hdr.setup_sects == 0 {
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4u64
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} else {
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params.hdr.setup_sects as u64
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};
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let kernel_offset = setup_sects
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.checked_add(1)
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.ok_or(Error::InvalidSetupSects)?
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.checked_mul(512)
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.ok_or(Error::InvalidSetupSects)?;
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let kernel_size = (params.hdr.syssize as usize)
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.checked_mul(16)
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.ok_or(Error::InvalidSysSize)?;
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kernel_image
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.seek(SeekFrom::Start(kernel_offset))
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.map_err(|_| Error::SeekKernelStart)?;
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// Load the whole kernel image to kernel_start
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guest_mem
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.read_to_memory(kernel_start, kernel_image, kernel_size)
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.map_err(|_| Error::ReadKernelImage)?;
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Ok((params, kernel_start.offset() + kernel_size as u64))
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}
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