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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.
package limits
import (
"fmt"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
)
// FromLinuxResource maps linux resources to sentry LimitTypes.
var FromLinuxResource = map[int]LimitType{
linux.RLIMIT_CPU: CPU,
linux.RLIMIT_FSIZE: FileSize,
linux.RLIMIT_DATA: Data,
linux.RLIMIT_STACK: Stack,
linux.RLIMIT_CORE: Core,
linux.RLIMIT_RSS: Rss,
linux.RLIMIT_NPROC: ProcessCount,
linux.RLIMIT_NOFILE: NumberOfFiles,
linux.RLIMIT_MEMLOCK: MemoryLocked,
linux.RLIMIT_AS: AS,
linux.RLIMIT_LOCKS: Locks,
linux.RLIMIT_SIGPENDING: SignalsPending,
linux.RLIMIT_MSGQUEUE: MessageQueueBytes,
linux.RLIMIT_NICE: Nice,
linux.RLIMIT_RTPRIO: RealTimePriority,
linux.RLIMIT_RTTIME: Rttime,
}
// FromLinux maps linux rlimit values to sentry Limits, being careful to handle
// infinities.
func FromLinux(rl uint64) uint64 {
if rl == linux.RLimInfinity {
return Infinity
}
return rl
}
// ToLinux maps sentry Limits to linux rlimit values, being careful to handle
// infinities.
func ToLinux(l uint64) uint64 {
if l == Infinity {
return linux.RLimInfinity
}
return l
}
// NewLinuxLimitSet returns a LimitSet whose values match the default rlimits
// in Linux.
func NewLinuxLimitSet() (*LimitSet, error) {
ls := NewLimitSet()
for rlt, rl := range linux.InitRLimits {
lt, ok := FromLinuxResource[rlt]
if !ok {
return nil, fmt.Errorf("unknown rlimit type %v", rlt)
}
ls.SetUnchecked(lt, Limit{
Cur: FromLinux(rl.Cur),
Max: FromLinux(rl.Max),
})
}
return ls, nil
}
// NewLinuxDistroLimitSet returns a new LimitSet whose values are typical
// for a booted Linux distro.
//
// Many Linux init systems adjust the default Linux limits to values more
// expected by the rest of the userspace. NewLinuxDistroLimitSet returns a
// LimitSet with sensible defaults for applications that aren't starting
// their own init system.
func NewLinuxDistroLimitSet() (*LimitSet, error) {
ls, err := NewLinuxLimitSet()
if err != nil {
return nil, err
}
// Adjust ProcessCount to a lower value because GNU bash allocates 16
// bytes per proc and OOMs if this number is set too high. Value was
// picked arbitrarily.
//
// 1,048,576 ought to be enough for anyone.
l := ls.Get(ProcessCount)
l.Cur = 1 << 20
ls.Set(ProcessCount, l, true /* privileged */)
return ls, nil
}
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