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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "test/util/proc_util.h"
#include <algorithm>
#include <iostream>
#include <vector>
#include "absl/strings/ascii.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
#include "absl/strings/string_view.h"
#include "test/util/fs_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
// Parses a single line from /proc/<xxx>/maps.
PosixErrorOr<ProcMapsEntry> ParseProcMapsLine(absl::string_view line) {
ProcMapsEntry map_entry = {};
// Limit splitting to 6 parts so that if there is a file path and it contains
// spaces, the file path is not split.
std::vector<std::string> parts =
absl::StrSplit(line, absl::MaxSplits(' ', 5), absl::SkipEmpty());
// parts.size() should be 6 if there is a file name specified, and 5
// otherwise.
if (parts.size() < 5) {
return PosixError(EINVAL, absl::StrCat("Invalid line: ", line));
}
// Address range in the form X-X where X are hex values without leading 0x.
std::vector<std::string> addresses = absl::StrSplit(parts[0], '-');
if (addresses.size() != 2) {
return PosixError(EINVAL,
absl::StrCat("Invalid address range: ", parts[0]));
}
ASSIGN_OR_RETURN_ERRNO(map_entry.start, AtoiBase(addresses[0], 16));
ASSIGN_OR_RETURN_ERRNO(map_entry.end, AtoiBase(addresses[1], 16));
// Permissions are four bytes of the form rwxp or - if permission not set.
if (parts[1].size() != 4) {
return PosixError(EINVAL,
absl::StrCat("Invalid permission field: ", parts[1]));
}
map_entry.readable = parts[1][0] == 'r';
map_entry.writable = parts[1][1] == 'w';
map_entry.executable = parts[1][2] == 'x';
map_entry.priv = parts[1][3] == 'p';
ASSIGN_OR_RETURN_ERRNO(map_entry.offset, AtoiBase(parts[2], 16));
std::vector<std::string> device = absl::StrSplit(parts[3], ':');
if (device.size() != 2) {
return PosixError(EINVAL, absl::StrCat("Invalid device: ", parts[3]));
}
ASSIGN_OR_RETURN_ERRNO(map_entry.major, AtoiBase(device[0], 16));
ASSIGN_OR_RETURN_ERRNO(map_entry.minor, AtoiBase(device[1], 16));
ASSIGN_OR_RETURN_ERRNO(map_entry.inode, Atoi<int64_t>(parts[4]));
if (parts.size() == 6) {
// A filename is present. However, absl::StrSplit retained the whitespace
// between the inode number and the filename.
map_entry.filename = std::string(absl::StripLeadingAsciiWhitespace(parts[5]));
}
return map_entry;
}
PosixErrorOr<std::vector<ProcMapsEntry>> ParseProcMaps(
absl::string_view contents) {
std::vector<ProcMapsEntry> entries;
auto lines = absl::StrSplit(contents, '\n', absl::SkipEmpty());
for (const auto& l : lines) {
std::cout << "line: " << l;
ASSIGN_OR_RETURN_ERRNO(auto entry, ParseProcMapsLine(l));
entries.push_back(entry);
}
return entries;
}
PosixErrorOr<bool> IsVsyscallEnabled() {
ASSIGN_OR_RETURN_ERRNO(auto contents, GetContents("/proc/self/maps"));
ASSIGN_OR_RETURN_ERRNO(auto maps, ParseProcMaps(contents));
return std::any_of(maps.begin(), maps.end(), [](const ProcMapsEntry& e) {
return e.filename == "[vsyscall]";
});
}
} // namespace testing
} // namespace gvisor
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