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ee3ac3aa66
This adds a small C binary for fighting zombies. It is mounted under
`/dev/init` and is prepended to the args specified by the user. You
enable it via a daemon flag, `dockerd --init`, as it is disable by
default for backwards compat.
You can also override the daemon option or specify this on a per
container basis with `docker run --init=true|false`.
You can test this by running a process like this as the pid 1 in a
container and see the extra zombie that appears in the container as it
is running.
```c
int main(int argc, char ** argv) {
pid_t pid = fork();
if (pid == 0) {
pid = fork();
if (pid == 0) {
exit(0);
}
sleep(3);
exit(0);
}
printf("got pid %d and exited\n", pid);
sleep(20);
}
```
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
167 lines
3.5 KiB
Go
167 lines
3.5 KiB
Go
package oci
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import (
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"os"
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"runtime"
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"github.com/opencontainers/runtime-spec/specs-go"
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)
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func sPtr(s string) *string { return &s }
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func iPtr(i int64) *int64 { return &i }
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func u32Ptr(i int64) *uint32 { u := uint32(i); return &u }
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func fmPtr(i int64) *os.FileMode { fm := os.FileMode(i); return &fm }
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// DefaultSpec returns default oci spec used by docker.
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func DefaultSpec() specs.Spec {
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s := specs.Spec{
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Version: specs.Version,
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Platform: specs.Platform{
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OS: runtime.GOOS,
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Arch: runtime.GOARCH,
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},
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}
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s.Mounts = []specs.Mount{
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{
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Destination: "/proc",
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Type: "proc",
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Source: "proc",
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Options: []string{"nosuid", "noexec", "nodev"},
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},
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{
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Destination: "/dev",
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Type: "tmpfs",
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Source: "tmpfs",
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Options: []string{"nosuid", "strictatime", "mode=755"},
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},
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{
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Destination: "/dev/pts",
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Type: "devpts",
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Source: "devpts",
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Options: []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"},
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},
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{
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Destination: "/sys",
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Type: "sysfs",
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Source: "sysfs",
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Options: []string{"nosuid", "noexec", "nodev", "ro"},
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},
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{
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Destination: "/sys/fs/cgroup",
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Type: "cgroup",
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Source: "cgroup",
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Options: []string{"ro", "nosuid", "noexec", "nodev"},
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},
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{
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Destination: "/dev/mqueue",
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Type: "mqueue",
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Source: "mqueue",
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Options: []string{"nosuid", "noexec", "nodev"},
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},
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}
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s.Process.Capabilities = []string{
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"CAP_CHOWN",
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"CAP_DAC_OVERRIDE",
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"CAP_FSETID",
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"CAP_FOWNER",
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"CAP_MKNOD",
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"CAP_NET_RAW",
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"CAP_SETGID",
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"CAP_SETUID",
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"CAP_SETFCAP",
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"CAP_SETPCAP",
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"CAP_NET_BIND_SERVICE",
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"CAP_SYS_CHROOT",
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"CAP_KILL",
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"CAP_AUDIT_WRITE",
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}
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s.Linux = specs.Linux{
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MaskedPaths: []string{
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"/proc/kcore",
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"/proc/latency_stats",
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"/proc/timer_list",
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"/proc/timer_stats",
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"/proc/sched_debug",
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},
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ReadonlyPaths: []string{
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"/proc/asound",
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"/proc/bus",
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"/proc/fs",
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"/proc/irq",
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"/proc/sys",
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"/proc/sysrq-trigger",
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},
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Namespaces: []specs.Namespace{
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{Type: "mount"},
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{Type: "network"},
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{Type: "uts"},
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{Type: "pid"},
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{Type: "ipc"},
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},
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// Devices implicitly contains the following devices:
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// null, zero, full, random, urandom, tty, console, and ptmx.
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// ptmx is a bind-mount or symlink of the container's ptmx.
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// See also: https://github.com/opencontainers/runtime-spec/blob/master/config-linux.md#default-devices
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Devices: []specs.Device{},
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Resources: &specs.Resources{
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Devices: []specs.DeviceCgroup{
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{
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Allow: false,
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Access: sPtr("rwm"),
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},
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{
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Allow: true,
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Type: sPtr("c"),
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Major: iPtr(1),
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Minor: iPtr(5),
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Access: sPtr("rwm"),
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},
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{
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Allow: true,
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Type: sPtr("c"),
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Major: iPtr(1),
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Minor: iPtr(3),
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Access: sPtr("rwm"),
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},
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{
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Allow: true,
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Type: sPtr("c"),
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Major: iPtr(1),
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Minor: iPtr(9),
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Access: sPtr("rwm"),
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},
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{
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Allow: true,
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Type: sPtr("c"),
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Major: iPtr(1),
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Minor: iPtr(8),
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Access: sPtr("rwm"),
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},
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{
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Allow: true,
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Type: sPtr("c"),
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Major: iPtr(5),
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Minor: iPtr(0),
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Access: sPtr("rwm"),
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},
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{
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Allow: true,
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Type: sPtr("c"),
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Major: iPtr(5),
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Minor: iPtr(1),
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Access: sPtr("rwm"),
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},
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{
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Allow: false,
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Type: sPtr("c"),
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Major: iPtr(10),
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Minor: iPtr(229),
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Access: sPtr("rwm"),
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},
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},
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},
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}
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return s
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}
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