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53fabd4b86
qemu-ga's socket activation support was not obeying the LISTEN_PID environment variable, which avoids that a process uses a socket-activation file descriptor meant for its parent. Mess can for example ensue if a process forks a children before consuming the socket-activation file descriptor and therefore setting O_CLOEXEC on it. Luckily, qemu-nbd also got socket activation code, and its copy does support LISTEN_PID. Some extra fixups are needed to ensure that the code can be used for both, but that's what this patch does. The main change is to replace get_listen_fds's "consume" argument with the FIRST_SOCKET_ACTIVATION_FD macro from the qemu-nbd code. Cc: "Richard W.M. Jones" <rjones@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* systemd socket activation support
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*
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* Copyright 2017 Red Hat, Inc. and/or its affiliates
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*
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* Authors:
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* Richard W.M. Jones <rjones@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/systemd.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#ifndef _WIN32
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unsigned int check_socket_activation(void)
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{
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const char *s;
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unsigned long pid;
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unsigned long nr_fds;
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unsigned int i;
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int fd;
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int err;
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s = getenv("LISTEN_PID");
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if (s == NULL) {
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return 0;
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}
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err = qemu_strtoul(s, NULL, 10, &pid);
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if (err) {
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return 0;
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}
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if (pid != getpid()) {
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return 0;
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}
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s = getenv("LISTEN_FDS");
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if (s == NULL) {
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return 0;
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}
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err = qemu_strtoul(s, NULL, 10, &nr_fds);
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if (err) {
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return 0;
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}
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assert(nr_fds <= UINT_MAX);
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/* So these are not passed to any child processes we might start. */
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unsetenv("LISTEN_FDS");
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unsetenv("LISTEN_PID");
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/* So the file descriptors don't leak into child processes. */
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for (i = 0; i < nr_fds; ++i) {
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fd = FIRST_SOCKET_ACTIVATION_FD + i;
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
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/* If we cannot set FD_CLOEXEC then it probably means the file
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* descriptor is invalid, so socket activation has gone wrong
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* and we should exit.
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*/
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error_report("Socket activation failed: "
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"invalid file descriptor fd = %d: %m",
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fd);
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exit(EXIT_FAILURE);
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}
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}
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return (unsigned int) nr_fds;
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}
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#else /* !_WIN32 */
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unsigned int check_socket_activation(void)
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{
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return 0;
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}
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#endif
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