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On Linux, we want to attach additional attributes to processes, i.e., the chroot location, the designated UID, and GID. Instead of polluting the generic code with such Linux-specific platform details, I introduced the new 'Native_pd_args' type, which can be customized for each platform. The platform-dependent policy of init is factored out in the new 'pd_args' library. The new 'base-linux/run/lx_pd_args.run' script can be used to validate the propagation of those attributes into core. Note that this patch does not add the interpretation of the new UID and PID attributes by core. This will be subject of a follow-up patch. Related to #510.
84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
/*
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* \brief Implementation of process creation for Linux
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* \author Norman Feske
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* \date 2006-07-06
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*/
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/*
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* Copyright (C) 2006-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/elf.h>
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#include <base/env.h>
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#include <base/process.h>
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#include <base/printf.h>
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#include <linux_pd_session/client.h>
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/* framework-internal includes */
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#include <linux_syscalls.h>
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using namespace Genode;
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Dataspace_capability Process::_dynamic_linker_cap;
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/**
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* Check for dynamic ELF header
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*/
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static bool _check_dynamic_elf(Dataspace_capability elf_ds_cap)
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{
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/* attach ELF locally */
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addr_t elf_addr;
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try { elf_addr = env()->rm_session()->attach(elf_ds_cap); }
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catch (...) { return false; }
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/*
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* If attach is called within core, it will return zero because
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* Linux uses Core_rm_session.
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*/
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if (!elf_addr) return false;
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/* read program header and interpreter */
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Elf_binary elf((addr_t)elf_addr);
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env()->rm_session()->detach((void *)elf_addr);
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return elf.is_dynamically_linked();
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}
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Process::Process(Dataspace_capability elf_data_ds_cap,
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Ram_session_capability ram_session_cap,
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Cpu_session_capability cpu_session_cap,
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Rm_session_capability rm_session_cap,
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Parent_capability parent_cap,
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char const *name,
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Native_pd_args const *pd_args)
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:
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_pd(name, pd_args),
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_cpu_session_client(Cpu_session_capability()),
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_rm_session_client(Rm_session_capability())
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{
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/* check for dynamic program header */
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if (_check_dynamic_elf(elf_data_ds_cap)) {
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if (!_dynamic_linker_cap.valid()) {
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PERR("Dynamically linked file found, but no dynamic linker binary present");
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return;
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}
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elf_data_ds_cap = _dynamic_linker_cap;
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}
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Linux_pd_session_client lx_pd(static_cap_cast<Linux_pd_session>(_pd.cap()));
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lx_pd.assign_parent(parent_cap);
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lx_pd.start(elf_data_ds_cap);
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}
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Process::~Process() { }
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