72 lines
2.5 KiB
Diff
72 lines
2.5 KiB
Diff
From: "Daniel P. Berrange" <berrange@redhat.com>
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Subject: PATCH: Fix permissions problem starting QEMU
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There is a minor bug when running QEMU non-root, and having
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capng enabled. libvirt is unable to write the PID file in
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/var/run/libvirt/qemu, since its now owned by 'qemu', but
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libvirtd has dropped all capabilties at this point. The fix
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is to delay dropping capabilities until after the PID file
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has been created. We should also be sure to kill the child
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if writing the PID file fails
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* src/util.c: Don't drop capabilities until after the PID file has
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been written. Kill off child if writing the PID file fails
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* src/qemu_driver.c: Remove bogus trailing '/' in state dir
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diff --git a/src/qemu_driver.c b/src/qemu_driver.c
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index 9fb8506..26897d3 100644
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--- a/src/qemu_driver.c
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+++ b/src/qemu_driver.c
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@@ -468,7 +468,7 @@ qemudStartup(int privileged) {
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goto out_of_memory;
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if (virAsprintf(&qemu_driver->stateDir,
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- "%s/run/libvirt/qemu/", LOCAL_STATE_DIR) == -1)
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+ "%s/run/libvirt/qemu", LOCAL_STATE_DIR) == -1)
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goto out_of_memory;
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} else {
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uid_t uid = geteuid();
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diff --git a/src/util.c b/src/util.c
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index ee64b28..39aae24 100644
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--- a/src/util.c
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+++ b/src/util.c
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@@ -513,12 +513,6 @@ __virExec(virConnectPtr conn,
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if ((hook)(data) != 0)
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_exit(1);
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- /* The hook above may need todo something privileged, so
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- * we delay clearing capabilities until now */
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- if ((flags & VIR_EXEC_CLEAR_CAPS) &&
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- virClearCapabilities() < 0)
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- _exit(1);
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-
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/* Daemonize as late as possible, so the parent process can detect
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* the above errors with wait* */
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if (flags & VIR_EXEC_DAEMON) {
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@@ -543,6 +537,9 @@ __virExec(virConnectPtr conn,
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if (pid > 0) {
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if (pidfile && virFileWritePidPath(pidfile,pid)) {
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+ kill(pid, SIGTERM);
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+ usleep(500*1000);
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+ kill(pid, SIGTERM);
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virReportSystemError(conn, errno,
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"%s", _("could not write pidfile"));
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_exit(1);
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@@ -551,6 +548,12 @@ __virExec(virConnectPtr conn,
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}
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}
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+ /* The steps above may need todo something privileged, so
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+ * we delay clearing capabilities until the last minute */
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+ if ((flags & VIR_EXEC_CLEAR_CAPS) &&
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+ virClearCapabilities() < 0)
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+ _exit(1);
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+
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if (envp)
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execve(argv[0], (char **) argv, (char**)envp);
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else
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