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authorGiuseppe Scrivano <gscrivan@redhat.com>2021-01-11 11:25:43 +0100
committerGiuseppe Scrivano <gscrivan@redhat.com>2021-01-12 10:38:32 +0100
commitfdbc278868fa0e9ea470d77857a7905811d2faa0 (patch)
tree1d60c9297247957de352aca7e9047aa59d9c8ec7 /libpod
parent41613bdb96953c9cea8a8fd46da211bd42660944 (diff)
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oci: use /proc/self/fd/FD to open unix socket
instead of opening directly the UNIX socket path, grab a reference to it through a O_PATH file descriptor and use the fixed size string "/proc/self/fd/%d" to open the UNIX socket. In this way it won't hit the 108 chars length limit. Closes: https://github.com/containers/podman/issues/8798 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Diffstat (limited to 'libpod')
-rw-r--r--libpod/oci_attach_linux.go29
-rw-r--r--libpod/oci_attach_linux_cgo.go11
-rw-r--r--libpod/oci_attach_linux_nocgo.go7
-rw-r--r--libpod/oci_conmon_exec_linux.go6
-rw-r--r--libpod/oci_conmon_linux.go7
5 files changed, 18 insertions, 42 deletions
diff --git a/libpod/oci_attach_linux.go b/libpod/oci_attach_linux.go
index fbc95510e..4556eba94 100644
--- a/libpod/oci_attach_linux.go
+++ b/libpod/oci_attach_linux.go
@@ -28,6 +28,15 @@ const (
AttachPipeStderr = 3
)
+func openUnixSocket(path string) (*net.UnixConn, error) {
+ fd, err := unix.Open(path, unix.O_PATH, 0)
+ if err != nil {
+ return nil, err
+ }
+ defer unix.Close(fd)
+ return net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: fmt.Sprintf("/proc/self/fd/%d", fd), Net: "unixpacket"})
+}
+
// Attach to the given container
// Does not check if state is appropriate
// started is only required if startContainer is true
@@ -52,11 +61,10 @@ func (c *Container) attach(streams *define.AttachStreams, keys string, resize <-
if err != nil {
return err
}
- socketPath := buildSocketPath(attachSock)
- conn, err := net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: socketPath, Net: "unixpacket"})
+ conn, err := openUnixSocket(attachSock)
if err != nil {
- return errors.Wrapf(err, "failed to connect to container's attach socket: %v", socketPath)
+ return errors.Wrapf(err, "failed to connect to container's attach socket: %v", attachSock)
}
defer func() {
if err := conn.Close(); err != nil {
@@ -124,7 +132,6 @@ func (c *Container) attachToExec(streams *define.AttachStreams, keys *string, se
if err != nil {
return err
}
- socketPath := buildSocketPath(sockPath)
// 2: read from attachFd that the parent process has set up the console socket
if _, err := readConmonPipeData(attachFd, ""); err != nil {
@@ -132,9 +139,9 @@ func (c *Container) attachToExec(streams *define.AttachStreams, keys *string, se
}
// 2: then attach
- conn, err := net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: socketPath, Net: "unixpacket"})
+ conn, err := openUnixSocket(sockPath)
if err != nil {
- return errors.Wrapf(err, "failed to connect to container's attach socket: %v", socketPath)
+ return errors.Wrapf(err, "failed to connect to container's attach socket: %v", sockPath)
}
defer func() {
if err := conn.Close(); err != nil {
@@ -182,16 +189,6 @@ func registerResizeFunc(resize <-chan remotecommand.TerminalSize, bundlePath str
})
}
-func buildSocketPath(socketPath string) string {
- maxUnixLength := unixPathLength()
- if maxUnixLength < len(socketPath) {
- socketPath = socketPath[0:maxUnixLength]
- }
-
- logrus.Debug("connecting to socket ", socketPath)
- return socketPath
-}
-
func setupStdioChannels(streams *define.AttachStreams, conn *net.UnixConn, detachKeys []byte) (chan error, chan error) {
receiveStdoutError := make(chan error)
go func() {
diff --git a/libpod/oci_attach_linux_cgo.go b/libpod/oci_attach_linux_cgo.go
deleted file mode 100644
index d81243360..000000000
--- a/libpod/oci_attach_linux_cgo.go
+++ /dev/null
@@ -1,11 +0,0 @@
-//+build linux,cgo
-
-package libpod
-
-//#include <sys/un.h>
-// extern int unix_path_length(){struct sockaddr_un addr; return sizeof(addr.sun_path) - 1;}
-import "C"
-
-func unixPathLength() int {
- return int(C.unix_path_length())
-}
diff --git a/libpod/oci_attach_linux_nocgo.go b/libpod/oci_attach_linux_nocgo.go
deleted file mode 100644
index a514a555d..000000000
--- a/libpod/oci_attach_linux_nocgo.go
+++ /dev/null
@@ -1,7 +0,0 @@
-//+build linux,!cgo
-
-package libpod
-
-func unixPathLength() int {
- return 107
-}
diff --git a/libpod/oci_conmon_exec_linux.go b/libpod/oci_conmon_exec_linux.go
index d6b63f25e..dc5dd03df 100644
--- a/libpod/oci_conmon_exec_linux.go
+++ b/libpod/oci_conmon_exec_linux.go
@@ -2,7 +2,6 @@ package libpod
import (
"fmt"
- "net"
"net/http"
"os"
"os/exec"
@@ -512,7 +511,6 @@ func attachExecHTTP(c *Container, sessionID string, r *http.Request, w http.Resp
if err != nil {
return err
}
- socketPath := buildSocketPath(sockPath)
// 2: read from attachFd that the parent process has set up the console socket
if _, err := readConmonPipeData(pipes.attachPipe, ""); err != nil {
@@ -520,9 +518,9 @@ func attachExecHTTP(c *Container, sessionID string, r *http.Request, w http.Resp
}
// 2: then attach
- conn, err := net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: socketPath, Net: "unixpacket"})
+ conn, err := openUnixSocket(sockPath)
if err != nil {
- return errors.Wrapf(err, "failed to connect to container's attach socket: %v", socketPath)
+ return errors.Wrapf(err, "failed to connect to container's attach socket: %v", sockPath)
}
defer func() {
if err := conn.Close(); err != nil {
diff --git a/libpod/oci_conmon_linux.go b/libpod/oci_conmon_linux.go
index 6b5da439a..bc938b08c 100644
--- a/libpod/oci_conmon_linux.go
+++ b/libpod/oci_conmon_linux.go
@@ -529,13 +529,12 @@ func (r *ConmonOCIRuntime) HTTPAttach(ctr *Container, req *http.Request, w http.
if err != nil {
return err
}
- socketPath := buildSocketPath(attachSock)
var conn *net.UnixConn
if streamAttach {
- newConn, err := net.DialUnix("unixpacket", nil, &net.UnixAddr{Name: socketPath, Net: "unixpacket"})
+ newConn, err := openUnixSocket(attachSock)
if err != nil {
- return errors.Wrapf(err, "failed to connect to container's attach socket: %v", socketPath)
+ return errors.Wrapf(err, "failed to connect to container's attach socket: %v", attachSock)
}
conn = newConn
defer func() {
@@ -544,7 +543,7 @@ func (r *ConmonOCIRuntime) HTTPAttach(ctr *Container, req *http.Request, w http.
}
}()
- logrus.Debugf("Successfully connected to container %s attach socket %s", ctr.ID(), socketPath)
+ logrus.Debugf("Successfully connected to container %s attach socket %s", ctr.ID(), attachSock)
}
detachString := ctr.runtime.config.Engine.DetachKeys