101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package limits
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import (
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"fmt"
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"gvisor.googlesource.com/gvisor/pkg/abi/linux"
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)
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// FromLinuxResource maps linux resources to sentry LimitTypes.
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var FromLinuxResource = map[int]LimitType{
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linux.RLIMIT_CPU: CPU,
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linux.RLIMIT_FSIZE: FileSize,
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linux.RLIMIT_DATA: Data,
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linux.RLIMIT_STACK: Stack,
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linux.RLIMIT_CORE: Core,
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linux.RLIMIT_RSS: Rss,
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linux.RLIMIT_NPROC: ProcessCount,
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linux.RLIMIT_NOFILE: NumberOfFiles,
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linux.RLIMIT_MEMLOCK: MemoryPagesLocked,
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linux.RLIMIT_AS: AS,
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linux.RLIMIT_LOCKS: Locks,
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linux.RLIMIT_SIGPENDING: SignalsPending,
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linux.RLIMIT_MSGQUEUE: MessageQueueBytes,
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linux.RLIMIT_NICE: Nice,
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linux.RLIMIT_RTPRIO: RealTimePriority,
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linux.RLIMIT_RTTIME: Rttime,
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}
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// FromLinux maps linux rlimit values to sentry Limits, being careful to handle
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// infinities.
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func FromLinux(rl uint64) uint64 {
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if rl == linux.RLimInfinity {
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return Infinity
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}
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return rl
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}
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// ToLinux maps sentry Limits to linux rlimit values, being careful to handle
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// infinities.
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func ToLinux(l uint64) uint64 {
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if l == Infinity {
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return linux.RLimInfinity
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}
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return l
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}
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// NewLinuxLimitSet returns a LimitSet whose values match the default rlimits
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// in Linux.
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func NewLinuxLimitSet() (*LimitSet, error) {
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ls := NewLimitSet()
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for rlt, rl := range linux.InitRLimits {
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lt, ok := FromLinuxResource[rlt]
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if !ok {
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return nil, fmt.Errorf("unknown rlimit type %v", rlt)
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}
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ls.SetUnchecked(lt, Limit{
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Cur: FromLinux(rl.Cur),
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Max: FromLinux(rl.Max),
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})
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}
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return ls, nil
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}
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// NewLinuxDistroLimitSet returns a new LimitSet whose values are typical
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// for a booted Linux distro.
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//
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// Many Linux init systems adjust the default Linux limits to values more
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// expected by the rest of the userspace. NewLinuxDistroLimitSet returns a
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// LimitSet with sensible defaults for applications that aren't starting
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// their own init system.
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func NewLinuxDistroLimitSet() (*LimitSet, error) {
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ls, err := NewLinuxLimitSet()
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if err != nil {
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return nil, err
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}
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// Adjust ProcessCount to a lower value because GNU bash allocates 16
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// bytes per proc and OOMs if this number is set too high. Value was
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// picked arbitrarily.
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//
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// 1,048,576 ought to be enough for anyone.
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l := ls.Get(ProcessCount)
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l.Cur = 1 << 20
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ls.Set(ProcessCount, l)
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return ls, nil
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}
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