.gitignore

@@ -1 +1 @@
-SOURCES/runc-2abd837.tar.gz
+SOURCES/v1.0.2.tar.gz

.runc.metadata

@@ -1 +1 @@
-cf7119a838db2963e7af6ecdba90a2cc95ec0d56 SOURCES/runc-2abd837.tar.gz
+3a0bb2a9506981b5a2204fb1591afc827ecaeb45 SOURCES/v1.0.2.tar.gz

SOURCES/0001-Revert-Apply-cgroups-earlier.patch

@@ -1,62 +0,0 @@
-From dfb3496c174377b860b62872ce6af951364cc3ac Mon Sep 17 00:00:00 2001
-From: Lokesh Mandvekar <lsm5@fedoraproject.org>
-Date: Tue, 12 Dec 2017 13:22:42 +0530
-Subject: [PATCH] Revert "Apply cgroups earlier"
-
-This reverts commit 7062c7556b71188abc18d7516441ff4b03fbc1fc.
----
- libcontainer/process_linux.go | 31 ++++++++++++++-----------------
- 1 file changed, 14 insertions(+), 17 deletions(-)
-
-diff --git a/libcontainer/process_linux.go b/libcontainer/process_linux.go
-index 149b1126..b8a395af 100644
---- a/libcontainer/process_linux.go
-+++ b/libcontainer/process_linux.go
-@@ -272,6 +272,20 @@ func (p *initProcess) start() error {
- 		p.process.ops = nil
- 		return newSystemErrorWithCause(err, "starting init process command")
- 	}
-+	if _, err := io.Copy(p.parentPipe, p.bootstrapData); err != nil {
-+		return newSystemErrorWithCause(err, "copying bootstrap data to pipe")
-+	}
-+	if err := p.execSetns(); err != nil {
-+		return newSystemErrorWithCause(err, "running exec setns process for init")
-+	}
-+	// Save the standard descriptor names before the container process
-+	// can potentially move them (e.g., via dup2()).  If we don't do this now,
-+	// we won't know at checkpoint time which file descriptor to look up.
-+	fds, err := getPipeFds(p.pid())
-+	if err != nil {
-+		return newSystemErrorWithCausef(err, "getting pipe fds for pid %d", p.pid())
-+	}
-+	p.setExternalDescriptors(fds)
- 	// Do this before syncing with child so that no children can escape the
- 	// cgroup. We don't need to worry about not doing this and not being root
- 	// because we'd be using the rootless cgroup manager in that case.
-@@ -292,23 +306,6 @@ func (p *initProcess) start() error {
- 			}
- 		}
- 	}()
--
--	if _, err := io.Copy(p.parentPipe, p.bootstrapData); err != nil {
--		return newSystemErrorWithCause(err, "copying bootstrap data to pipe")
--	}
--
--	if err := p.execSetns(); err != nil {
--		return newSystemErrorWithCause(err, "running exec setns process for init")
--	}
--
--	// Save the standard descriptor names before the container process
--	// can potentially move them (e.g., via dup2()).  If we don't do this now,
--	// we won't know at checkpoint time which file descriptor to look up.
--	fds, err := getPipeFds(p.pid())
--	if err != nil {
--		return newSystemErrorWithCausef(err, "getting pipe fds for pid %d", p.pid())
--	}
--	p.setExternalDescriptors(fds)
- 	if err := p.createNetworkInterfaces(); err != nil {
- 		return newSystemErrorWithCause(err, "creating network interfaces")
- 	}
--- 
-2.14.3
-

SOURCES/0001-nsenter-clone-proc-self-exe-to-avoid-exposing-host-b-runc.patch

@@ -1,290 +0,0 @@
-From bf6405284aa3870a39b402309003633a1c230ed9 Mon Sep 17 00:00:00 2001
-From: Aleksa Sarai <asarai@suse.de>
-Date: Wed, 9 Jan 2019 13:40:01 +1100
-Subject: [PATCH 1/1] nsenter: clone /proc/self/exe to avoid exposing host
- binary to container
-
-There are quite a few circumstances where /proc/self/exe pointing to a
-pretty important container binary is a _bad_ thing, so to avoid this we
-have to make a copy (preferably doing self-clean-up and not being
-writeable).
-
-As a hotfix we require memfd_create(2), but we can always extend this to
-use a scratch MNT_DETACH overlayfs or tmpfs. The main downside to this
-approach is no page-cache sharing for the runc binary (which overlayfs
-would give us) but this is far less complicated.
-
-This is only done during nsenter so that it happens transparently to the
-Go code, and any libcontainer users benefit from it. This also makes
-ExtraFiles and --preserve-fds handling trivial (because we don't need to
-worry about it).
-
-Fixes: CVE-2019-5736
-Co-developed-by: Christian Brauner <christian.brauner@ubuntu.com>
-Signed-off-by: Aleksa Sarai <asarai@suse.de>
-Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
----
- libcontainer/nsenter/cloned_binary.c | 221 +++++++++++++++++++++++++++
- libcontainer/nsenter/nsexec.c        |  11 ++
- 2 files changed, 232 insertions(+)
- create mode 100644 libcontainer/nsenter/cloned_binary.c
-
-diff --git a/libcontainer/nsenter/cloned_binary.c b/libcontainer/nsenter/cloned_binary.c
-new file mode 100644
-index 00000000..d9f6093a
---- /dev/null
-+++ b/libcontainer/nsenter/cloned_binary.c
-@@ -0,0 +1,221 @@
-+#define _GNU_SOURCE
-+#include <unistd.h>
-+#include <stdio.h>
-+#include <stdlib.h>
-+#include <stdbool.h>
-+#include <string.h>
-+#include <limits.h>
-+#include <fcntl.h>
-+#include <errno.h>
-+
-+#include <sys/types.h>
-+#include <sys/stat.h>
-+#include <sys/vfs.h>
-+#include <sys/mman.h>
-+#include <sys/sendfile.h>
-+#include <sys/syscall.h>
-+
-+#include <linux/magic.h>
-+#include <linux/memfd.h>
-+
-+/* Use our own wrapper for memfd_create. */
-+#if !defined(SYS_memfd_create) && defined(__NR_memfd_create)
-+#  define SYS_memfd_create __NR_memfd_create
-+#endif
-+#ifndef SYS_memfd_create
-+#  error "memfd_create(2) syscall not supported by this glibc version"
-+#endif
-+int memfd_create(const char *name, unsigned int flags)
-+{
-+	return syscall(SYS_memfd_create, name, flags);
-+}
-+
-+/* This comes directly from <linux/fcntl.h>. */
-+#ifndef F_LINUX_SPECIFIC_BASE
-+#  define F_LINUX_SPECIFIC_BASE 1024
-+#endif
-+#ifndef F_ADD_SEALS
-+#  define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
-+#  define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
-+#endif
-+#ifndef F_SEAL_SEAL
-+#  define F_SEAL_SEAL   0x0001	/* prevent further seals from being set */
-+#  define F_SEAL_SHRINK 0x0002	/* prevent file from shrinking */
-+#  define F_SEAL_GROW   0x0004	/* prevent file from growing */
-+#  define F_SEAL_WRITE  0x0008	/* prevent writes */
-+#endif
-+
-+
-+#define OUR_MEMFD_COMMENT "runc_cloned:/proc/self/exe"
-+#define OUR_MEMFD_SEALS \
-+	(F_SEAL_SEAL | F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE)
-+
-+static void *must_realloc(void *ptr, size_t size)
-+{
-+	void *old = ptr;
-+	do {
-+		ptr = realloc(old, size);
-+	} while(!ptr);
-+	return ptr;
-+}
-+
-+/*
-+ * Verify whether we are currently in a self-cloned program (namely, is
-+ * /proc/self/exe a memfd). F_GET_SEALS will only succeed for memfds (or rather
-+ * for shmem files), and we want to be sure it's actually sealed.
-+ */
-+static int is_self_cloned(void)
-+{
-+	int fd, seals;
-+
-+	fd = open("/proc/self/exe", O_RDONLY|O_CLOEXEC);
-+	if (fd < 0)
-+		return -ENOTRECOVERABLE;
-+
-+	seals = fcntl(fd, F_GET_SEALS);
-+	close(fd);
-+	return seals == OUR_MEMFD_SEALS;
-+}
-+
-+/*
-+ * Basic wrapper around mmap(2) that gives you the file length so you can
-+ * safely treat it as an ordinary buffer. Only gives you read access.
-+ */
-+static char *read_file(char *path, size_t *length)
-+{
-+	int fd;
-+	char buf[4096], *copy = NULL;
-+
-+	if (!length)
-+		return NULL;
-+
-+	fd = open(path, O_RDONLY | O_CLOEXEC);
-+	if (fd < 0)
-+		return NULL;
-+
-+	*length = 0;
-+	for (;;) {
-+		int n;
-+
-+		n = read(fd, buf, sizeof(buf));
-+		if (n < 0)
-+			goto error;
-+		if (!n)
-+			break;
-+
-+		copy = must_realloc(copy, (*length + n) * sizeof(*copy));
-+		memcpy(copy + *length, buf, n);
-+		*length += n;
-+	}
-+	close(fd);
-+	return copy;
-+
-+error:
-+	close(fd);
-+	free(copy);
-+	return NULL;
-+}
-+
-+/*
-+ * A poor-man's version of "xargs -0". Basically parses a given block of
-+ * NUL-delimited data, within the given length and adds a pointer to each entry
-+ * to the array of pointers.
-+ */
-+static int parse_xargs(char *data, int data_length, char ***output)
-+{
-+	int num = 0;
-+	char *cur = data;
-+
-+	if (!data || *output != NULL)
-+		return -1;
-+
-+	while (cur < data + data_length) {
-+		num++;
-+		*output = must_realloc(*output, (num + 1) * sizeof(**output));
-+		(*output)[num - 1] = cur;
-+		cur += strlen(cur) + 1;
-+	}
-+	(*output)[num] = NULL;
-+	return num;
-+}
-+
-+/*
-+ * "Parse" out argv and envp from /proc/self/cmdline and /proc/self/environ.
-+ * This is necessary because we are running in a context where we don't have a
-+ * main() that we can just get the arguments from.
-+ */
-+static int fetchve(char ***argv, char ***envp)
-+{
-+	char *cmdline = NULL, *environ = NULL;
-+	size_t cmdline_size, environ_size;
-+
-+	cmdline = read_file("/proc/self/cmdline", &cmdline_size);
-+	if (!cmdline)
-+		goto error;
-+	environ = read_file("/proc/self/environ", &environ_size);
-+	if (!environ)
-+		goto error;
-+
-+	if (parse_xargs(cmdline, cmdline_size, argv) <= 0)
-+		goto error;
-+	if (parse_xargs(environ, environ_size, envp) <= 0)
-+		goto error;
-+
-+	return 0;
-+
-+error:
-+	free(environ);
-+	free(cmdline);
-+	return -EINVAL;
-+}
-+
-+#define SENDFILE_MAX 0x7FFFF000 /* sendfile(2) is limited to 2GB. */
-+static int clone_binary(void)
-+{
-+	int binfd, memfd, err;
-+	ssize_t sent = 0;
-+
-+	memfd = memfd_create(OUR_MEMFD_COMMENT, MFD_CLOEXEC | MFD_ALLOW_SEALING);
-+	if (memfd < 0)
-+		return -ENOTRECOVERABLE;
-+
-+	binfd = open("/proc/self/exe", O_RDONLY | O_CLOEXEC);
-+	if (binfd < 0)
-+		goto error;
-+
-+	sent = sendfile(memfd, binfd, NULL, SENDFILE_MAX);
-+	close(binfd);
-+	if (sent < 0)
-+		goto error;
-+
-+	err = fcntl(memfd, F_ADD_SEALS, OUR_MEMFD_SEALS);
-+	if (err < 0)
-+		goto error;
-+
-+	return memfd;
-+
-+error:
-+	close(memfd);
-+	return -EIO;
-+}
-+
-+int ensure_cloned_binary(void)
-+{
-+	int execfd;
-+	char **argv = NULL, **envp = NULL;
-+
-+	/* Check that we're not self-cloned, and if we are then bail. */
-+	int cloned = is_self_cloned();
-+	if (cloned > 0 || cloned == -ENOTRECOVERABLE)
-+		return cloned;
-+
-+	if (fetchve(&argv, &envp) < 0)
-+		return -EINVAL;
-+
-+	execfd = clone_binary();
-+	if (execfd < 0)
-+		return -EIO;
-+
-+	fexecve(execfd, argv, envp);
-+	return -ENOEXEC;
-+}
-diff --git a/libcontainer/nsenter/nsexec.c b/libcontainer/nsenter/nsexec.c
-index cb224314..784fd9b0 100644
---- a/libcontainer/nsenter/nsexec.c
-+++ b/libcontainer/nsenter/nsexec.c
-@@ -528,6 +528,9 @@ void join_namespaces(char *nslist)
- 	free(namespaces);
- }
- 
-+/* Defined in cloned_binary.c. */
-+int ensure_cloned_binary(void);
-+
- void nsexec(void)
- {
- 	int pipenum;
-@@ -543,6 +546,14 @@ void nsexec(void)
- 	if (pipenum == -1)
- 		return;
- 
-+	/*
-+	 * We need to re-exec if we are not in a cloned binary. This is necessary
-+	 * to ensure that containers won't be able to access the host binary
-+	 * through /proc/self/exe. See CVE-2019-5736.
-+	 */
-+	if (ensure_cloned_binary() < 0)
-+		bail("could not ensure we are a cloned binary");
-+
- 	/* Parse all of the netlink configuration. */
- 	nl_parse(pipenum, &config);
- 
--- 
-2.20.1
-

SOURCES/1807.patch

@@ -1,200 +0,0 @@
-From ecf53c23545092019602578583031c28fde4d2a1 Mon Sep 17 00:00:00 2001
-From: Giuseppe Scrivano <gscrivan@redhat.com>
-Date: Fri, 25 May 2018 18:04:06 +0200
-Subject: [PATCH] sd-notify: do not hang when NOTIFY_SOCKET is used with create
-
-if NOTIFY_SOCKET is used, do not block the main runc process waiting
-for events on the notify socket.  Change the logic to create a new
-process that monitors exclusively the notify socket until an event is
-received.
-
-Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
----
- init.go          |  12 +++++++
- notify_socket.go | 101 ++++++++++++++++++++++++++++++++++++++++++++++---------
- signals.go       |   5 +--
- 3 files changed, 99 insertions(+), 19 deletions(-)
-
-diff --git a/init.go b/init.go
-index c8f453192..6a3d9e91c 100644
---- a/init.go
-+++ b/init.go
-@@ -20,6 +20,18 @@ var initCommand = cli.Command{
- 	Name:  "init",
- 	Usage: `initialize the namespaces and launch the process (do not call it outside of runc)`,
- 	Action: func(context *cli.Context) error {
-+		// If NOTIFY_SOCKET is used create a new process that stays around
-+		// so to not block "runc start".  It will automatically exits when the
-+		// container notifies that it is ready, or when the container is deleted
-+		if os.Getenv("_NOTIFY_SOCKET_FD") != "" {
-+			fd := os.Getenv("_NOTIFY_SOCKET_FD")
-+			pid := os.Getenv("_NOTIFY_SOCKET_PID")
-+			hostNotifySocket := os.Getenv("_NOTIFY_SOCKET_HOST")
-+			notifySocketPath := os.Getenv("_NOTIFY_SOCKET_PATH")
-+			notifySocketInit(fd, pid, hostNotifySocket, notifySocketPath)
-+			os.Exit(0)
-+		}
-+
- 		factory, _ := libcontainer.New("")
- 		if err := factory.StartInitialization(); err != nil {
- 			// as the error is sent back to the parent there is no need to log
-diff --git a/notify_socket.go b/notify_socket.go
-index cd6c0a989..e04e9d660 100644
---- a/notify_socket.go
-+++ b/notify_socket.go
-@@ -6,10 +6,13 @@ import (
- 	"bytes"
- 	"fmt"
- 	"net"
-+	"os"
-+	"os/exec"
- 	"path/filepath"
-+	"strconv"
-+	"time"
- 
- 	"github.com/opencontainers/runtime-spec/specs-go"
--
- 	"github.com/sirupsen/logrus"
- 	"github.com/urfave/cli"
- )
-@@ -64,24 +67,94 @@ func (s *notifySocket) setupSocket() error {
- 	return nil
- }
- 
-+func (notifySocket *notifySocket) notifyNewPid(pid int) {
-+	notifySocketHostAddr := net.UnixAddr{Name: notifySocket.host, Net: "unixgram"}
-+	client, err := net.DialUnix("unixgram", nil, &notifySocketHostAddr)
-+	if err != nil {
-+		return
-+	}
-+	newPid := fmt.Sprintf("MAINPID=%d\n", pid)
-+	client.Write([]byte(newPid))
-+}
-+
- // pid1 must be set only with -d, as it is used to set the new process as the main process
- // for the service in systemd
- func (notifySocket *notifySocket) run(pid1 int) {
--	buf := make([]byte, 512)
--	notifySocketHostAddr := net.UnixAddr{Name: notifySocket.host, Net: "unixgram"}
--	client, err := net.DialUnix("unixgram", nil, &notifySocketHostAddr)
-+	file, err := notifySocket.socket.File()
- 	if err != nil {
- 		logrus.Error(err)
- 		return
- 	}
--	for {
--		r, err := notifySocket.socket.Read(buf)
--		if err != nil {
--			break
-+	defer file.Close()
-+	defer notifySocket.socket.Close()
-+
-+	cmd := exec.Command("/proc/self/exe", "init")
-+	cmd.ExtraFiles = []*os.File{file}
-+	cmd.Env = append(cmd.Env, "_NOTIFY_SOCKET_FD=3",
-+		fmt.Sprintf("_NOTIFY_SOCKET_PID=%d", pid1),
-+		fmt.Sprintf("_NOTIFY_SOCKET_HOST=%s", notifySocket.host),
-+		fmt.Sprintf("_NOTIFY_SOCKET_PATH=%s", notifySocket.socketPath))
-+
-+	if err := cmd.Start(); err != nil {
-+		logrus.Fatal(err)
-+	}
-+	notifySocket.notifyNewPid(cmd.Process.Pid)
-+	cmd.Process.Release()
-+}
-+
-+func notifySocketInit(envFd string, envPid string, notifySocketHost string, notifySocketPath string) {
-+	intFd, err := strconv.Atoi(envFd)
-+	if err != nil {
-+		return
-+	}
-+	pid1, err := strconv.Atoi(envPid)
-+	if err != nil {
-+		return
-+	}
-+
-+	file := os.NewFile(uintptr(intFd), "unixgram")
-+	defer file.Close()
-+
-+	fileChan := make(chan []byte)
-+	exitChan := make(chan bool)
-+
-+	go func() {
-+		for {
-+			buf := make([]byte, 512)
-+			r, err := file.Read(buf)
-+			if err != nil {
-+				return
-+			}
-+			fileChan <- buf[0:r]
- 		}
--		var out bytes.Buffer
--		for _, line := range bytes.Split(buf[0:r], []byte{'\n'}) {
--			if bytes.HasPrefix(line, []byte("READY=")) {
-+	}()
-+	go func() {
-+		for {
-+			if _, err := os.Stat(notifySocketPath); os.IsNotExist(err) {
-+				exitChan <- true
-+				return
-+			}
-+			time.Sleep(time.Second)
-+		}
-+	}()
-+
-+	notifySocketHostAddr := net.UnixAddr{Name: notifySocketHost, Net: "unixgram"}
-+	client, err := net.DialUnix("unixgram", nil, &notifySocketHostAddr)
-+	if err != nil {
-+		return
-+	}
-+
-+	for {
-+		select {
-+		case <-exitChan:
-+			return
-+		case b := <-fileChan:
-+			for _, line := range bytes.Split(b, []byte{'\n'}) {
-+				if !bytes.HasPrefix(line, []byte("READY=")) {
-+					continue
-+				}
-+
-+				var out bytes.Buffer
- 				_, err = out.Write(line)
- 				if err != nil {
- 					return
-@@ -98,10 +171,8 @@ func (notifySocket *notifySocket) run(pid1 int) {
- 				}
- 
- 				// now we can inform systemd to use pid1 as the pid to monitor
--				if pid1 > 0 {
--					newPid := fmt.Sprintf("MAINPID=%d\n", pid1)
--					client.Write([]byte(newPid))
--				}
-+				newPid := fmt.Sprintf("MAINPID=%d\n", pid1)
-+				client.Write([]byte(newPid))
- 				return
- 			}
- 		}
-diff --git a/signals.go b/signals.go
-index 1811de837..d0988cb39 100644
---- a/signals.go
-+++ b/signals.go
-@@ -70,7 +70,7 @@ func (h *signalHandler) forward(process *libcontainer.Process, tty *tty, detach
- 			h.notifySocket.run(pid1)
- 			return 0, nil
- 		} else {
--			go h.notifySocket.run(0)
-+			h.notifySocket.run(os.Getpid())
- 		}
- 	}
- 
-@@ -98,9 +98,6 @@ func (h *signalHandler) forward(process *libcontainer.Process, tty *tty, detach
- 					// status because we must ensure that any of the go specific process
- 					// fun such as flushing pipes are complete before we return.
- 					process.Wait()
--					if h.notifySocket != nil {
--						h.notifySocket.Close()
--					}
- 					return e.status, nil
- 				}
- 			}

SOURCES/99-containers.conf

@@ -1 +0,0 @@
-fs.may_detach_mounts=1

SOURCES/change-default-root.patch

@@ -1,61 +0,0 @@
-diff --git a/list.go b/list.go
-index 0313d8c..328798b 100644
---- a/list.go
-+++ b/list.go
-@@ -50,7 +50,7 @@ var listCommand = cli.Command{
- 	ArgsUsage: `
- 
- Where the given root is specified via the global option "--root"
--(default: "/run/runc").
-+(default: "/run/runc-ctrs").
- 
- EXAMPLE 1:
- To list containers created via the default "--root":
-diff --git a/main.go b/main.go
-index 278399a..0f49fce 100644
---- a/main.go
-+++ b/main.go
-@@ -62,7 +62,7 @@ func main() {
- 	v = append(v, fmt.Sprintf("spec: %s", specs.Version))
- 	app.Version = strings.Join(v, "\n")
- 
--	root := "/run/runc"
-+	root := "/run/runc-ctrs"
- 	rootless, err := isRootless(nil)
- 	if err != nil {
- 		fatal(err)
-@@ -70,7 +70,7 @@ func main() {
- 	if rootless {
- 		runtimeDir := os.Getenv("XDG_RUNTIME_DIR")
- 		if runtimeDir != "" {
--			root = runtimeDir + "/runc"
-+			root = runtimeDir + "/runc-ctrs"
- 			// According to the XDG specification, we need to set anything in
- 			// XDG_RUNTIME_DIR to have a sticky bit if we don't want it to get
- 			// auto-pruned.
-diff --git a/man/runc-list.8.md b/man/runc-list.8.md
-index f737424..107220e 100644
---- a/man/runc-list.8.md
-+++ b/man/runc-list.8.md
-@@ -6,7 +6,7 @@
- 
- # EXAMPLE
- Where the given root is specified via the global option "--root"
--(default: "/run/runc").
-+(default: "/run/runc-ctrs").
- 
- To list containers created via the default "--root":
-        # runc list
-diff --git a/man/runc.8.md b/man/runc.8.md
-index 6d0ddff..337bc73 100644
---- a/man/runc.8.md
-+++ b/man/runc.8.md
-@@ -51,7 +51,7 @@ value for "bundle" is the current directory.
-    --debug              enable debug output for logging
-    --log value          set the log file path where internal debug information is written (default: "/dev/null")
-    --log-format value   set the format used by logs ('text' (default), or 'json') (default: "text")
--   --root value         root directory for storage of container state (this should be located in tmpfs) (default: "/run/runc" or $XDG_RUNTIME_DIR/runc for rootless containers)
-+   --root value         root directory for storage of container state (this should be located in tmpfs) (default: "/run/runc-ctrs" or $XDG_RUNTIME_DIR/runc-ctrs for rootless containers)
-    --criu value         path to the criu binary used for checkpoint and restore (default: "criu")
-    --systemd-cgroup     enable systemd cgroup support, expects cgroupsPath to be of form "slice:prefix:name" for e.g. "system.slice:runc:434234"
-    --rootless value    enable rootless mode ('true', 'false', or 'auto') (default: "auto")

SOURCES/pivot-root.patch

@@ -1,72 +0,0 @@
-From 28a697cce3e4f905dca700eda81d681a30eef9cd Mon Sep 17 00:00:00 2001
-From: Giuseppe Scrivano <gscrivan@redhat.com>
-Date: Fri, 11 Jan 2019 21:53:45 +0100
-Subject: [PATCH] rootfs: umount all procfs and sysfs with --no-pivot
-
-When creating a new user namespace, the kernel doesn't allow to mount
-a new procfs or sysfs file system if there is not already one instance
-fully visible in the current mount namespace.
-
-When using --no-pivot we were effectively inhibiting this protection
-from the kernel, as /proc and /sys from the host are still present in
-the container mount namespace.
-
-A container without full access to /proc could then create a new user
-namespace, and from there able to mount a fully visible /proc, bypassing
-the limitations in the container.
-
-A simple reproducer for this issue is:
-
-unshare -mrfp sh -c "mount -t proc none /proc && echo c > /proc/sysrq-trigger"
-
-Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
----
- libcontainer/rootfs_linux.go | 35 +++++++++++++++++++++++++++++++++++
- 1 file changed, 35 insertions(+)
-
-diff --git a/libcontainer/rootfs_linux.go b/libcontainer/rootfs_linux.go
-index e7c2f8ada..6bd6da74a 100644
---- a/libcontainer/rootfs_linux.go
-+++ b/libcontainer/rootfs_linux.go
-@@ -748,6 +748,41 @@ func pivotRoot(rootfs string) error {
- }
- 
- func msMoveRoot(rootfs string) error {
-+	mountinfos, err := mount.GetMounts()
-+	if err != nil {
-+		return err
-+	}
-+
-+	absRootfs, err := filepath.Abs(rootfs)
-+	if err != nil {
-+		return err
-+	}
-+
-+	for _, info := range mountinfos {
-+		p, err := filepath.Abs(info.Mountpoint)
-+		if err != nil {
-+			return err
-+		}
-+		// Umount every syfs and proc file systems, except those under the container rootfs
-+		if (info.Fstype != "proc" && info.Fstype != "sysfs") || filepath.HasPrefix(p, absRootfs) {
-+			continue
-+		}
-+		// Be sure umount events are not propagated to the host.
-+		if err := unix.Mount("", p, "", unix.MS_SLAVE|unix.MS_REC, ""); err != nil {
-+			return err
-+		}
-+		if err := unix.Unmount(p, unix.MNT_DETACH); err != nil {
-+			if err != unix.EINVAL && err != unix.EPERM {
-+				return err
-+			} else {
-+				// If we have not privileges for umounting (e.g. rootless), then
-+				// cover the path.
-+				if err := unix.Mount("tmpfs", p, "tmpfs", 0, ""); err != nil {
-+					return err
-+				}
-+			}
-+		}
-+	}
- 	if err := unix.Mount(rootfs, "/", "", unix.MS_MOVE, ""); err != nil {
- 		return err
- 	}