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qemu: ensure sane umask for qemu process
Add umask to _virCommand, allow user to set umask to command. Set umask(002) to qemu process to overwrite the default umask of 022 set by many distros, so that unix sockets created for virtio-serial has expected permissions. Fix problem reported here: https://sourceware.org/bugzilla/show_bug.cgi?id=13078#c11 https://bugzilla.novell.com/show_bug.cgi?id=888166 To use virtio-serial device, unix socket created for chardev with default umask(022) has insufficient permissions. e.g.: -device virtio-serial \ -chardev socket,path=/tmp/foo,server,nowait,id=foo \ -device virtserialport,chardev=foo,name=org.fedoraproject.port.0 srwxr-xr-x 1 qemu qemu 0 21. Jul 14:19 /tmp/somefile.sock Other users in the same group (like real user, test engines, etc) cannot write to this socket. Signed-off-by: Chunyan Liu <cyliu@suse.com> Signed-off-by: Eric Blake <eblake@redhat.com>
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@ -1171,6 +1171,7 @@ virCommandSetPidFile;
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virCommandSetPreExecHook;
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virCommandSetSELinuxLabel;
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virCommandSetUID;
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virCommandSetUmask;
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virCommandSetWorkingDirectory;
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virCommandToString;
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virCommandWait;
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@ -4141,6 +4141,7 @@ int qemuProcessStart(virConnectPtr conn,
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virCommandSetPreExecHook(cmd, qemuProcessHook, &hookData);
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virCommandSetMaxProcesses(cmd, cfg->maxProcesses);
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virCommandSetMaxFiles(cmd, cfg->maxFiles);
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virCommandSetUmask(cmd, 0x002);
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VIR_DEBUG("Setting up security labelling");
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if (virSecurityManagerSetChildProcessLabel(driver->securityManager,
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@ -133,6 +133,7 @@ struct _virCommand {
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#if defined(WITH_SECDRIVER_APPARMOR)
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char *appArmorProfile;
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#endif
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int umask;
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};
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/* See virCommandSetDryRun for description for this variable */
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@ -582,6 +583,8 @@ virExec(virCommandPtr cmd)
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/* child */
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if (cmd->umask)
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umask(cmd->umask);
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ret = EXIT_CANCELED;
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openmax = sysconf(_SC_OPEN_MAX);
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if (openmax < 0) {
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@ -1082,6 +1085,14 @@ virCommandSetMaxFiles(virCommandPtr cmd, unsigned int files)
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cmd->maxFiles = files;
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}
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void virCommandSetUmask(virCommandPtr cmd, int umask)
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{
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if (!cmd || cmd->has_error)
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return;
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cmd->umask = umask;
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}
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/**
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* virCommandClearCaps:
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* @cmd: the command to modify
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@ -72,6 +72,7 @@ void virCommandSetUID(virCommandPtr cmd, uid_t uid);
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void virCommandSetMaxMemLock(virCommandPtr cmd, unsigned long long bytes);
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void virCommandSetMaxProcesses(virCommandPtr cmd, unsigned int procs);
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void virCommandSetMaxFiles(virCommandPtr cmd, unsigned int files);
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void virCommandSetUmask(virCommandPtr cmd, int umask);
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void virCommandClearCaps(virCommandPtr cmd);
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