cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

systemd.c (1903B)

      1/*
      2 * systemd socket activation support
      3 *
      4 * Copyright 2017 Red Hat, Inc. and/or its affiliates
      5 *
      6 * Authors:
      7 *  Richard W.M. Jones <rjones@redhat.com>
      8 *
      9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
     10 * See the COPYING file in the top-level directory.
     11 */
     12
     13#include "qemu/osdep.h"
     14#include "qemu/systemd.h"
     15#include "qemu/cutils.h"
     16#include "qemu/error-report.h"
     17
     18#ifndef _WIN32
     19unsigned int check_socket_activation(void)
     20{
     21    const char *s;
     22    unsigned long pid;
     23    unsigned long nr_fds;
     24    unsigned int i;
     25    int fd;
     26    int f;
     27    int err;
     28
     29    s = getenv("LISTEN_PID");
     30    if (s == NULL) {
     31        return 0;
     32    }
     33    err = qemu_strtoul(s, NULL, 10, &pid);
     34    if (err) {
     35        return 0;
     36    }
     37    if (pid != getpid()) {
     38        return 0;
     39    }
     40
     41    s = getenv("LISTEN_FDS");
     42    if (s == NULL) {
     43        return 0;
     44    }
     45    err = qemu_strtoul(s, NULL, 10, &nr_fds);
     46    if (err) {
     47        return 0;
     48    }
     49    assert(nr_fds <= UINT_MAX);
     50
     51    /* So these are not passed to any child processes we might start. */
     52    unsetenv("LISTEN_FDS");
     53    unsetenv("LISTEN_PID");
     54
     55    /* So the file descriptors don't leak into child processes. */
     56    for (i = 0; i < nr_fds; ++i) {
     57        fd = FIRST_SOCKET_ACTIVATION_FD + i;
     58        f = fcntl(fd, F_GETFD);
     59        if (f == -1 || fcntl(fd, F_SETFD, f | FD_CLOEXEC) == -1) {
     60            /* If we cannot set FD_CLOEXEC then it probably means the file
     61             * descriptor is invalid, so socket activation has gone wrong
     62             * and we should exit.
     63             */
     64            error_report("Socket activation failed: "
     65                         "invalid file descriptor fd = %d: %s",
     66                         fd, g_strerror(errno));
     67            exit(EXIT_FAILURE);
     68        }
     69    }
     70
     71    return (unsigned int) nr_fds;
     72}
     73
     74#else /* !_WIN32 */
     75unsigned int check_socket_activation(void)
     76{
     77    return 0;
     78}
     79#endif