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// Copyright 2018 Google Inc.
//
// 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.
package boot
import (
"fmt"
specs "github.com/opencontainers/runtime-spec/specs-go"
"gvisor.googlesource.com/gvisor/pkg/sentry/limits"
)
// Mapping from linux resource names to limits.LimitType.
var fromLinuxResource = map[string]limits.LimitType{
"RLIMIT_AS": limits.AS,
"RLIMIT_CORE": limits.Core,
"RLIMIT_CPU": limits.CPU,
"RLIMIT_DATA": limits.Data,
"RLIMIT_FSIZE": limits.FileSize,
"RLIMIT_LOCKS": limits.Locks,
"RLIMIT_MEMLOCK": limits.MemoryPagesLocked,
"RLIMIT_MSGQUEUE": limits.MessageQueueBytes,
"RLIMIT_NICE": limits.Nice,
"RLIMIT_NOFILE": limits.NumberOfFiles,
"RLIMIT_NPROC": limits.ProcessCount,
"RLIMIT_RSS": limits.Rss,
"RLIMIT_RTPRIO": limits.RealTimePriority,
"RLIMIT_RTTIME": limits.Rttime,
"RLIMIT_SIGPENDING": limits.SignalsPending,
"RLIMIT_STACK": limits.Stack,
}
func createLimitSet(spec *specs.Spec) (*limits.LimitSet, error) {
ls, err := limits.NewLinuxLimitSet()
if err != nil {
return nil, err
}
// Set default limits based on what containers get by default, ex:
// $ docker run --rm debian prlimit
ls.SetUnchecked(limits.AS, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.Core, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.CPU, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.Data, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.FileSize, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.Locks, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.MemoryPagesLocked, limits.Limit{Cur: 65536, Max: 65536})
ls.SetUnchecked(limits.MessageQueueBytes, limits.Limit{Cur: 819200, Max: 819200})
ls.SetUnchecked(limits.Nice, limits.Limit{Cur: 0, Max: 0})
ls.SetUnchecked(limits.NumberOfFiles, limits.Limit{Cur: 1048576, Max: 1048576})
ls.SetUnchecked(limits.ProcessCount, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.Rss, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.RealTimePriority, limits.Limit{Cur: 0, Max: 0})
ls.SetUnchecked(limits.Rttime, limits.Limit{Cur: limits.Infinity, Max: limits.Infinity})
ls.SetUnchecked(limits.SignalsPending, limits.Limit{Cur: 0, Max: 0})
ls.SetUnchecked(limits.Stack, limits.Limit{Cur: 8388608, Max: limits.Infinity})
// Then apply overwrites on top of defaults.
for _, rl := range spec.Process.Rlimits {
lt, ok := fromLinuxResource[rl.Type]
if !ok {
return nil, fmt.Errorf("unknown resource %q", rl.Type)
}
ls.SetUnchecked(lt, limits.Limit{
Cur: rl.Soft,
Max: rl.Hard,
})
}
return ls, nil
}
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