1 files changed, 108 insertions, 0 deletions
diff --git a/app-emulation/runc/files/runc-1.0.0_rc2-init-non-dumpable.patch b/app-emulation/runc/files/runc-1.0.0_rc2-init-non-dumpable.patch
new file mode 100644
index 000000000000..486835ad826c
--- /dev/null
+++ b/app-emulation/runc/files/runc-1.0.0_rc2-init-non-dumpable.patch
@@ -0,0 +1,108 @@
+From 50a19c6ff828c58e5dab13830bd3dacde268afe5 Mon Sep 17 00:00:00 2001
+From: Michael Crosby <crosbymichael@gmail.com>
+Date: Wed, 7 Dec 2016 15:05:51 -0800
+Subject: [PATCH] Set init processes as non-dumpable
+
+This sets the init processes that join and setup the container's
+namespaces as non-dumpable before they setns to the container's pid (or
+any other ) namespace.
+
+This settings is automatically reset to the default after the Exec in
+the container so that it does not change functionality for the
+applications that are running inside, just our init processes.
+
+This prevents parent processes, the pid 1 of the container, to ptrace
+the init process before it drops caps and other sets LSMs.
+
+This patch also ensures that the stateDirFD being used is still closed
+prior to exec, even though it is set as O_CLOEXEC, because of the order
+in the kernel.
+
+https://github.com/torvalds/linux/blob/v4.9/fs/exec.c#L1290-L1318
+
+The order during the exec syscall is that the process is set back to
+dumpable before O_CLOEXEC are processed.
+
+Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
+---
+ libcontainer/init_linux.go          | 3 ++-
+ libcontainer/nsenter/nsexec.c       | 5 +++++
+ libcontainer/setns_init_linux.go    | 7 ++++++-
+ libcontainer/standard_init_linux.go | 3 +++
+ 4 files changed, 16 insertions(+), 2 deletions(-)
+
+diff --git a/libcontainer/init_linux.go b/libcontainer/init_linux.go
+index b1e6762..4043d51 100644
+--- a/libcontainer/init_linux.go
++++ b/libcontainer/init_linux.go
+@@ -77,7 +77,8 @@ func newContainerInit(t initType, pipe *os.File, stateDirFD int) (initer, error)
+ 	switch t {
+ 	case initSetns:
+ 		return &linuxSetnsInit{
+-			config: config,
++			config:     config,
++			stateDirFD: stateDirFD,
+ 		}, nil
+ 	case initStandard:
+ 		return &linuxStandardInit{
+diff --git a/libcontainer/nsenter/nsexec.c b/libcontainer/nsenter/nsexec.c
+index b93f827..4b5398b 100644
+--- a/libcontainer/nsenter/nsexec.c
++++ b/libcontainer/nsenter/nsexec.c
+@@ -408,6 +408,11 @@ void nsexec(void)
+ 	if (pipenum == -1)
+ 		return;
+ 
++	/* make the process non-dumpable */
++	if (prctl(PR_SET_DUMPABLE, 0, 0, 0, 0) != 0) {
++		bail("failed to set process as non-dumpable");
++	}
++
+ 	/* Parse all of the netlink configuration. */
+ 	nl_parse(pipenum, &config);
+ 
+diff --git a/libcontainer/setns_init_linux.go b/libcontainer/setns_init_linux.go
+index 2a8f345..7f5f182 100644
+--- a/libcontainer/setns_init_linux.go
++++ b/libcontainer/setns_init_linux.go
+@@ -5,6 +5,7 @@ package libcontainer
+ import (
+ 	"fmt"
+ 	"os"
++	"syscall"
+ 
+ 	"github.com/opencontainers/runc/libcontainer/apparmor"
+ 	"github.com/opencontainers/runc/libcontainer/keys"
+@@ -16,7 +17,8 @@ import (
+ // linuxSetnsInit performs the container's initialization for running a new process
+ // inside an existing container.
+ type linuxSetnsInit struct {
+-	config *initConfig
++	config     *initConfig
++	stateDirFD int
+ }
+ 
+ func (l *linuxSetnsInit) getSessionRingName() string {
+@@ -49,5 +51,8 @@ func (l *linuxSetnsInit) Init() error {
+ 	if err := label.SetProcessLabel(l.config.ProcessLabel); err != nil {
+ 		return err
+ 	}
++	// close the statedir fd before exec because the kernel resets dumpable in the wrong order
++	// https://github.com/torvalds/linux/blob/v4.9/fs/exec.c#L1290-L1318
++	syscall.Close(l.stateDirFD)
+ 	return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ())
+ }
+diff --git a/libcontainer/standard_init_linux.go b/libcontainer/standard_init_linux.go
+index 2104f1a..6a65154 100644
+--- a/libcontainer/standard_init_linux.go
++++ b/libcontainer/standard_init_linux.go
+@@ -171,6 +171,9 @@ func (l *linuxStandardInit) Init() error {
+ 			return newSystemErrorWithCause(err, "init seccomp")
+ 		}
+ 	}
++	// close the statedir fd before exec because the kernel resets dumpable in the wrong order
++	// https://github.com/torvalds/linux/blob/v4.9/fs/exec.c#L1290-L1318
++	syscall.Close(l.stateDirFD)
+ 	if err := syscall.Exec(name, l.config.Args[0:], os.Environ()); err != nil {
+ 		return newSystemErrorWithCause(err, "exec user process")
+ 	}