78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
/*
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* \brief Linux-specific core implementation of the dataspace component
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* \author Stefan Kalkowski
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* \date 2015-09-25
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*
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* The Linux version of ROM session component does not use the
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* Rom_fs as provided as constructor argument. Instead, we map
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* rom modules directly to files of the host file system.
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*/
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/*
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* Copyright (C) 2015-2017 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 Affero General Public License version 3.
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*/
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/* Linux includes */
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#include <core_linux_syscalls.h>
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#include <sys/fcntl.h>
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/* Genode includes */
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#include <linux_dataspace/linux_dataspace.h>
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#include <util/arg_string.h>
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#include <root/root.h>
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#include <base/session_label.h>
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/* local includes */
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#include "dataspace_component.h"
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using namespace Genode;
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Linux_dataspace::Filename Dataspace_component::_file_name(const char *args)
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{
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Session_label const label = label_from_args(args);
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Linux_dataspace::Filename fname;
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if (label.last_element().length() > sizeof(fname.buf)) {
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Genode::error("file name too long: ", label.last_element());
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throw Service_denied();
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}
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copy_cstring(fname.buf, label.last_element().string(), sizeof(fname.buf));
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/* only files inside the current working directory are allowed */
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for (const char *c = fname.buf; *c; ++c)
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if (*c == '/') throw Service_denied();
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return fname;
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}
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Genode::size_t Dataspace_component::_file_size()
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{
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struct stat64 s;
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if (lx_stat(_fname.buf, &s) < 0) throw Service_denied();
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return s.st_size;
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}
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Dataspace_component::Dataspace_component(const char *args)
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: _fname(_file_name(args)),
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_size(_file_size()),
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_addr(0),
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_cap(_fd_to_cap(lx_open(_fname.buf, O_RDONLY | LX_O_CLOEXEC, S_IRUSR | S_IXUSR))),
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_writable(false),
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_owner(0) { }
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Dataspace_component::Dataspace_component(size_t size, addr_t, addr_t phys_addr,
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Cache_attribute, bool, Dataspace_owner *_owner) :
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_size(size), _addr(phys_addr), _cap(), _writable(false), _owner(_owner)
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{
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warning("Should only be used for IOMEM and not within Linux.");
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_fname.buf[0] = 0;
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}
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