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bca17d16ca
Implement CLONE_INTO_CGROUP feature, allowing to put a child in a specified cgroup in a clean and simple way. Note that the feature only works for cgroup v2, and requires Linux kernel 5.7 or newer. Using the feature requires a new syscall, clone3. Currently this is the only reason to use clone3, but the code is structured in a way so that other cases may be easily added in the future. Add a test case. While at it, try to simplify the syscall calling code in forkAndExecInChild1, which became complicated over time because: 1. It was using either rawVforkSyscall or RawSyscall6 depending on whether CLONE_NEWUSER was set. 2. On Linux/s390, the first two arguments to clone(2) system call are swapped (which deserved a mention in Linux ABI hall of shame). It was worked around in rawVforkSyscall on s390, but had to be implemented via a switch/case when using RawSyscall6, making the code less clear. Let's - modify rawVforkSyscall to have two arguments (which is also required for clone3); - remove the arguments workaround from s390 asm, instead implementing arguments swap in the caller (which still looks ugly but at least it's done once and is clearly documented now); - use rawVforkSyscall for all cases (since it is essentially similar to RawSyscall6, except for having less parameters, not returning r2, and saving/restoring the return address before/after syscall on 386 and amd64). Updates #51246. Change-Id: Ifcd418ebead9257177338ffbcccd0bdecb94474e Reviewed-on: https://go-review.googlesource.com/c/go/+/417695 Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com> Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org>
101 lines
4.4 KiB
Go
101 lines
4.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build linux && (ppc64 || ppc64le)
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package syscall
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const (
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_SYS_setgroups = SYS_SETGROUPS
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_SYS_clone3 = 435
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_SYS_faccessat2 = 439
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)
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//sys Dup2(oldfd int, newfd int) (err error)
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//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
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//sys Fchown(fd int, uid int, gid int) (err error)
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//sys Fstat(fd int, stat *Stat_t) (err error)
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//sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_NEWFSTATAT
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//sys Fstatfs(fd int, buf *Statfs_t) (err error)
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//sys Ftruncate(fd int, length int64) (err error)
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//sysnb Getegid() (egid int)
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//sysnb Geteuid() (euid int)
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//sysnb Getgid() (gid int)
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//sysnb Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_UGETRLIMIT
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//sysnb Getuid() (uid int)
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//sysnb InotifyInit() (fd int, err error)
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//sys Ioperm(from int, num int, on int) (err error)
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//sys Iopl(level int) (err error)
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//sys Lchown(path string, uid int, gid int) (err error)
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//sys Listen(s int, n int) (err error)
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//sys Lstat(path string, stat *Stat_t) (err error)
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//sys Pause() (err error)
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//sys pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
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//sys pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
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//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
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//sys Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
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//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
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//sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
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//sys Setfsgid(gid int) (err error)
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//sys Setfsuid(uid int) (err error)
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//sysnb Setrlimit(resource int, rlim *Rlimit) (err error)
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//sys Shutdown(fd int, how int) (err error)
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//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
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//sys Stat(path string, stat *Stat_t) (err error)
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//sys Statfs(path string, buf *Statfs_t) (err error)
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//sys Truncate(path string, length int64) (err error)
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//sys Ustat(dev int, ubuf *Ustat_t) (err error)
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//sys accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
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//sys bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
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//sys connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
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//sysnb getgroups(n int, list *_Gid_t) (nn int, err error)
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//sys getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
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//sys setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
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//sysnb socket(domain int, typ int, proto int) (fd int, err error)
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//sysnb socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
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//sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
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//sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
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//sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
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//sys sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
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//sys recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
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//sys sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
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//sys mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)
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//sys futimesat(dirfd int, path string, times *[2]Timeval) (err error)
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//sysnb Gettimeofday(tv *Timeval) (err error)
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//sysnb Time(t *Time_t) (tt Time_t, err error)
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//sys Utime(path string, buf *Utimbuf) (err error)
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//sys utimes(path string, times *[2]Timeval) (err error)
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func setTimespec(sec, nsec int64) Timespec {
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return Timespec{Sec: sec, Nsec: nsec}
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}
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func setTimeval(sec, usec int64) Timeval {
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return Timeval{Sec: sec, Usec: usec}
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}
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func (r *PtraceRegs) PC() uint64 { return r.Nip }
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func (r *PtraceRegs) SetPC(pc uint64) { r.Nip = pc }
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func (iov *Iovec) SetLen(length int) {
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iov.Len = uint64(length)
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}
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func (msghdr *Msghdr) SetControllen(length int) {
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msghdr.Controllen = uint64(length)
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}
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func (cmsg *Cmsghdr) SetLen(length int) {
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cmsg.Len = uint64(length)
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}
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//sys syncFileRange2(fd int, flags int, off int64, n int64) (err error) = SYS_SYNC_FILE_RANGE2
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func SyncFileRange(fd int, off int64, n int64, flags int) error {
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// The sync_file_range and sync_file_range2 syscalls differ only in the
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// order of their arguments.
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return syncFileRange2(fd, flags, off, n)
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}
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