3dfdd48211
This patch fixes the buggy special path comparisons in src/kern/linux/linux.cc Linux::openSpecialFile(), which only checked for equality of path prefixes, but not equality of the paths themselves. This patch replaces those buggy comparisons with regular std::string::operator== string equality comparisons. GitHub issue: https://github.com/gem5/gem5/issues/269 Change-Id: I216ff8019b9a6a3e87e364c2e197d9b991959ec1
139 lines
4.4 KiB
C++
139 lines
4.4 KiB
C++
/*
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* Copyright (c) 2009 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "kern/linux/linux.hh"
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#include <cstdio>
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#include <string>
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#include "base/compiler.hh"
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#include "cpu/base.hh"
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#include "debug/SyscallVerbose.hh"
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#include "sim/mem_state.hh"
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#include "sim/process.hh"
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#include "sim/se_workload.hh"
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#include "sim/system.hh"
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#include "sim/vma.hh"
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namespace gem5
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{
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// The OS methods are called statically. Instantiate the random number
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// generator for access to /dev/urandom here.
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Random Linux::random;
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int
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Linux::openSpecialFile(std::string path, Process *process,
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ThreadContext *tc)
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{
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DPRINTFR(SyscallVerbose,
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"%d: %s: generic-open: opening special file: %s\n",
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curTick(), tc->getCpuPtr()->name(), path.c_str());
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bool matched = false;
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std::string data;
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if (path == "/proc/meminfo") {
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data = Linux::procMeminfo(process, tc);
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matched = true;
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} else if (path == "/etc/passwd") {
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data = Linux::etcPasswd(process, tc);
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matched = true;
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} else if (path == "/proc/self/maps") {
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data = Linux::procSelfMaps(process, tc);
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matched = true;
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} else if (path == "/sys/devices/system/cpu/online") {
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data = Linux::cpuOnline(process, tc);
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matched = true;
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} else if (path == "/dev/urandom") {
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data = Linux::devRandom(process, tc);
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matched = true;
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}
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if (matched) {
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FILE *f = tmpfile();
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int fd = fileno(f);
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[[maybe_unused]] size_t ret = fwrite(data.c_str(), 1, data.size(), f);
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assert(ret == data.size());
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rewind(f);
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return fd;
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} else {
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warn("Attempting to open special file: %s. Ignoring. Simulation may "
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"take un-expected code path or be non-deterministic until proper "
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"handling is implemented.\n", path.c_str());
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errno = EACCES;
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return -1;
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}
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}
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std::string
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Linux::procMeminfo(Process *process, ThreadContext *tc)
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{
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return csprintf("MemTotal:%12d kB\nMemFree: %12d kB\n",
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process->seWorkload->memSize() >> 10,
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process->seWorkload->freeMemSize() >> 10);
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}
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std::string
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Linux::etcPasswd(Process *process, ThreadContext *tc)
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{
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return csprintf("gem5-user:x:1000:1000:gem5-user,,,:%s:/bin/bash\n",
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process->tgtCwd);
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}
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std::string
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Linux::procSelfMaps(Process *process, ThreadContext *tc)
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{
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return process->memState->printVmaList();
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}
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std::string
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Linux::cpuOnline(Process *process, ThreadContext *tc)
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{
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return csprintf("0-%d\n", tc->getSystemPtr()->threads.size() - 1);
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}
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std::string
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Linux::devRandom(Process *process, ThreadContext *tc)
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{
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DPRINTFR(SyscallVerbose,
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"%d: %s: open: generating urandom\n",
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curTick(), tc->getCpuPtr()->name());
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std::stringstream line;
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int max = 1E5;
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for (int i = 0; i < max; i++) {
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uint8_t rand_uint = random.random<uint8_t>(0, 255);
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line << rand_uint;
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}
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return line.str();
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}
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} // namespace gem5
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