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![Daniel Xu](/assets/img/avatar_default.png)
If capture-output is requested but one of the channels goes unused (eg. we attempt to capture stderr but the command never writes to stderr), we can leak memory. guest_exec_output_watch() is (from what I understand) unconditionally called for both streams if output capture is requested. The first call will always pass the `p->size == p->length` check b/c both values are 0. Then GUEST_EXEC_IO_SIZE bytes will be allocated for the stream. But when we reap the exited process there's a `gei->err.length > 0` check to actually free the buffer. Which does not get run if the command doesn't write to the stream. Fix by making free() unconditional. Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com> Signed-off-by: Daniel Xu <dxu@dxuuu.xyz> Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
639 lines
18 KiB
C
639 lines
18 KiB
C
/*
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* QEMU Guest Agent common/cross-platform command implementations
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*
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* Copyright IBM Corp. 2012
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*
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* Authors:
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* Michael Roth <mdroth@linux.vnet.ibm.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/units.h"
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#include "guest-agent-core.h"
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#include "qga-qapi-commands.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/base64.h"
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#include "qemu/cutils.h"
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#include "commands-common.h"
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/* Maximum captured guest-exec out_data/err_data - 16MB */
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#define GUEST_EXEC_MAX_OUTPUT (16 * 1024 * 1024)
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/* Allocation and I/O buffer for reading guest-exec out_data/err_data - 4KB */
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#define GUEST_EXEC_IO_SIZE (4 * 1024)
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/*
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* Maximum file size to read - 48MB
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*
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* (48MB + Base64 3:4 overhead = JSON parser 64 MB limit)
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*/
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#define GUEST_FILE_READ_COUNT_MAX (48 * MiB)
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/* Note: in some situations, like with the fsfreeze, logging may be
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* temporarily disabled. if it is necessary that a command be able
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* to log for accounting purposes, check ga_logging_enabled() beforehand.
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*/
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void slog(const gchar *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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g_logv("syslog", G_LOG_LEVEL_INFO, fmt, ap);
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va_end(ap);
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}
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int64_t qmp_guest_sync_delimited(int64_t id, Error **errp)
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{
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ga_set_response_delimited(ga_state);
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return id;
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}
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int64_t qmp_guest_sync(int64_t id, Error **errp)
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{
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return id;
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}
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void qmp_guest_ping(Error **errp)
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{
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slog("guest-ping called");
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}
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static void qmp_command_info(const QmpCommand *cmd, void *opaque)
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{
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GuestAgentInfo *info = opaque;
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GuestAgentCommandInfo *cmd_info;
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cmd_info = g_new0(GuestAgentCommandInfo, 1);
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cmd_info->name = g_strdup(qmp_command_name(cmd));
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cmd_info->enabled = qmp_command_is_enabled(cmd);
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cmd_info->success_response = qmp_has_success_response(cmd);
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QAPI_LIST_PREPEND(info->supported_commands, cmd_info);
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}
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struct GuestAgentInfo *qmp_guest_info(Error **errp)
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{
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GuestAgentInfo *info = g_new0(GuestAgentInfo, 1);
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info->version = g_strdup(QEMU_VERSION);
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qmp_for_each_command(&ga_commands, qmp_command_info, info);
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return info;
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}
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struct GuestExecIOData {
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guchar *data;
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gsize size;
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gsize length;
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bool closed;
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bool truncated;
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const char *name;
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};
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typedef struct GuestExecIOData GuestExecIOData;
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struct GuestExecInfo {
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GPid pid;
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int64_t pid_numeric;
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gint status;
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bool has_output;
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bool finished;
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GuestExecIOData in;
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GuestExecIOData out;
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GuestExecIOData err;
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QTAILQ_ENTRY(GuestExecInfo) next;
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};
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typedef struct GuestExecInfo GuestExecInfo;
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static struct {
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QTAILQ_HEAD(, GuestExecInfo) processes;
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} guest_exec_state = {
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.processes = QTAILQ_HEAD_INITIALIZER(guest_exec_state.processes),
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};
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static int64_t gpid_to_int64(GPid pid)
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{
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#ifdef G_OS_WIN32
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return GetProcessId(pid);
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#else
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return (int64_t)pid;
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#endif
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}
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static GuestExecInfo *guest_exec_info_add(GPid pid)
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{
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GuestExecInfo *gei;
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gei = g_new0(GuestExecInfo, 1);
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gei->pid = pid;
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gei->pid_numeric = gpid_to_int64(pid);
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QTAILQ_INSERT_TAIL(&guest_exec_state.processes, gei, next);
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return gei;
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}
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static GuestExecInfo *guest_exec_info_find(int64_t pid_numeric)
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{
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GuestExecInfo *gei;
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QTAILQ_FOREACH(gei, &guest_exec_state.processes, next) {
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if (gei->pid_numeric == pid_numeric) {
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return gei;
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}
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}
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return NULL;
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}
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GuestExecStatus *qmp_guest_exec_status(int64_t pid, Error **errp)
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{
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GuestExecInfo *gei;
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GuestExecStatus *ges;
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slog("guest-exec-status called, pid: %u", (uint32_t)pid);
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gei = guest_exec_info_find(pid);
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if (gei == NULL) {
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error_setg(errp, QERR_INVALID_PARAMETER, "pid");
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return NULL;
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}
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ges = g_new0(GuestExecStatus, 1);
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bool finished = gei->finished;
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/* need to wait till output channels are closed
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* to be sure we captured all output at this point */
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if (gei->has_output) {
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finished &= gei->out.closed && gei->err.closed;
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}
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ges->exited = finished;
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if (finished) {
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/* Glib has no portable way to parse exit status.
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* On UNIX, we can get either exit code from normal termination
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* or signal number.
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* On Windows, it is either the same exit code or the exception
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* value for an unhandled exception that caused the process
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* to terminate.
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* See MSDN for GetExitCodeProcess() and ntstatus.h for possible
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* well-known codes, e.g. C0000005 ACCESS_DENIED - analog of SIGSEGV
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* References:
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* https://msdn.microsoft.com/en-us/library/windows/desktop/ms683189(v=vs.85).aspx
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* https://msdn.microsoft.com/en-us/library/aa260331(v=vs.60).aspx
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*/
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#ifdef G_OS_WIN32
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/* Additionally WIN32 does not provide any additional information
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* on whether the child exited or terminated via signal.
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* We use this simple range check to distinguish application exit code
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* (usually value less then 256) and unhandled exception code with
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* ntstatus (always value greater then 0xC0000005). */
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if ((uint32_t)gei->status < 0xC0000000U) {
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ges->has_exitcode = true;
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ges->exitcode = gei->status;
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} else {
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ges->has_signal = true;
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ges->signal = gei->status;
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}
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#else
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if (WIFEXITED(gei->status)) {
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ges->has_exitcode = true;
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ges->exitcode = WEXITSTATUS(gei->status);
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} else if (WIFSIGNALED(gei->status)) {
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ges->has_signal = true;
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ges->signal = WTERMSIG(gei->status);
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}
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#endif
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if (gei->out.length > 0) {
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ges->out_data = g_base64_encode(gei->out.data, gei->out.length);
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ges->has_out_truncated = gei->out.truncated;
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}
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g_free(gei->out.data);
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if (gei->err.length > 0) {
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ges->err_data = g_base64_encode(gei->err.data, gei->err.length);
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ges->has_err_truncated = gei->err.truncated;
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}
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g_free(gei->err.data);
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QTAILQ_REMOVE(&guest_exec_state.processes, gei, next);
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g_free(gei);
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}
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return ges;
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}
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/* Get environment variables or arguments array for execve(). */
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static char **guest_exec_get_args(const strList *entry, bool log)
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{
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const strList *it;
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int count = 1, i = 0; /* reserve for NULL terminator */
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char **args;
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char *str; /* for logging array of arguments */
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size_t str_size = 1;
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for (it = entry; it != NULL; it = it->next) {
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count++;
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str_size += 1 + strlen(it->value);
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}
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str = g_malloc(str_size);
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*str = 0;
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args = g_new(char *, count);
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for (it = entry; it != NULL; it = it->next) {
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args[i++] = it->value;
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pstrcat(str, str_size, it->value);
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if (it->next) {
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pstrcat(str, str_size, " ");
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}
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}
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args[i] = NULL;
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if (log) {
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slog("guest-exec called: \"%s\"", str);
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}
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g_free(str);
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return args;
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}
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static void guest_exec_child_watch(GPid pid, gint status, gpointer data)
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{
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GuestExecInfo *gei = (GuestExecInfo *)data;
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g_debug("guest_exec_child_watch called, pid: %d, status: %u",
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(int32_t)gpid_to_int64(pid), (uint32_t)status);
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gei->status = status;
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gei->finished = true;
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g_spawn_close_pid(pid);
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}
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static void guest_exec_task_setup(gpointer data)
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{
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#if !defined(G_OS_WIN32)
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bool has_merge = *(bool *)data;
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struct sigaction sigact;
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if (has_merge) {
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/*
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* FIXME: When `GLIB_VERSION_MIN_REQUIRED` is bumped to 2.58+, use
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* g_spawn_async_with_fds() to be portable on windows. The current
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* logic does not work on windows b/c `GSpawnChildSetupFunc` is run
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* inside the parent, not the child.
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*/
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if (dup2(STDOUT_FILENO, STDERR_FILENO) != 0) {
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slog("dup2() failed to merge stderr into stdout: %s",
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strerror(errno));
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}
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}
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/* Reset ignored signals back to default. */
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memset(&sigact, 0, sizeof(struct sigaction));
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sigact.sa_handler = SIG_DFL;
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if (sigaction(SIGPIPE, &sigact, NULL) != 0) {
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slog("sigaction() failed to reset child process's SIGPIPE: %s",
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strerror(errno));
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}
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#endif
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}
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static gboolean guest_exec_input_watch(GIOChannel *ch,
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GIOCondition cond, gpointer p_)
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{
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GuestExecIOData *p = (GuestExecIOData *)p_;
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gsize bytes_written = 0;
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GIOStatus status;
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GError *gerr = NULL;
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/* nothing left to write */
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if (p->size == p->length) {
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goto done;
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}
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status = g_io_channel_write_chars(ch, (gchar *)p->data + p->length,
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p->size - p->length, &bytes_written, &gerr);
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/* can be not 0 even if not G_IO_STATUS_NORMAL */
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if (bytes_written != 0) {
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p->length += bytes_written;
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}
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/* continue write, our callback will be called again */
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if (status == G_IO_STATUS_NORMAL || status == G_IO_STATUS_AGAIN) {
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return true;
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}
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if (gerr) {
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g_warning("qga: i/o error writing to input_data channel: %s",
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gerr->message);
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g_error_free(gerr);
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}
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done:
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g_io_channel_shutdown(ch, true, NULL);
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g_io_channel_unref(ch);
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p->closed = true;
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g_free(p->data);
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return false;
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}
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static gboolean guest_exec_output_watch(GIOChannel *ch,
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GIOCondition cond, gpointer p_)
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{
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GuestExecIOData *p = (GuestExecIOData *)p_;
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gsize bytes_read;
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GIOStatus gstatus;
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if (cond == G_IO_HUP || cond == G_IO_ERR) {
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goto close;
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}
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if (p->size == p->length) {
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gpointer t = NULL;
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if (!p->truncated && p->size < GUEST_EXEC_MAX_OUTPUT) {
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t = g_try_realloc(p->data, p->size + GUEST_EXEC_IO_SIZE);
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}
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if (t == NULL) {
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/* ignore truncated output */
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gchar buf[GUEST_EXEC_IO_SIZE];
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p->truncated = true;
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gstatus = g_io_channel_read_chars(ch, buf, sizeof(buf),
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&bytes_read, NULL);
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if (gstatus == G_IO_STATUS_EOF || gstatus == G_IO_STATUS_ERROR) {
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goto close;
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}
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return true;
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}
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p->size += GUEST_EXEC_IO_SIZE;
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p->data = t;
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}
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/* Calling read API once.
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* On next available data our callback will be called again */
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gstatus = g_io_channel_read_chars(ch, (gchar *)p->data + p->length,
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p->size - p->length, &bytes_read, NULL);
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if (gstatus == G_IO_STATUS_EOF || gstatus == G_IO_STATUS_ERROR) {
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goto close;
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}
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p->length += bytes_read;
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return true;
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close:
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g_io_channel_shutdown(ch, true, NULL);
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g_io_channel_unref(ch);
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p->closed = true;
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return false;
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}
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static GuestExecCaptureOutputMode ga_parse_capture_output(
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GuestExecCaptureOutput *capture_output)
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{
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if (!capture_output)
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return GUEST_EXEC_CAPTURE_OUTPUT_MODE_NONE;
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else if (capture_output->type == QTYPE_QBOOL)
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return capture_output->u.flag ? GUEST_EXEC_CAPTURE_OUTPUT_MODE_SEPARATED
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: GUEST_EXEC_CAPTURE_OUTPUT_MODE_NONE;
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else
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return capture_output->u.mode;
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}
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GuestExec *qmp_guest_exec(const char *path,
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bool has_arg, strList *arg,
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bool has_env, strList *env,
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const char *input_data,
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GuestExecCaptureOutput *capture_output,
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Error **errp)
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{
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GPid pid;
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GuestExec *ge = NULL;
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GuestExecInfo *gei;
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char **argv, **envp;
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strList arglist;
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gboolean ret;
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GError *gerr = NULL;
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gint in_fd, out_fd, err_fd;
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GIOChannel *in_ch, *out_ch, *err_ch;
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GSpawnFlags flags;
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bool has_output = false;
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bool has_merge = false;
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GuestExecCaptureOutputMode output_mode;
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g_autofree uint8_t *input = NULL;
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size_t ninput = 0;
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arglist.value = (char *)path;
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arglist.next = has_arg ? arg : NULL;
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if (input_data) {
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input = qbase64_decode(input_data, -1, &ninput, errp);
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if (!input) {
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return NULL;
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}
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}
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argv = guest_exec_get_args(&arglist, true);
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envp = has_env ? guest_exec_get_args(env, false) : NULL;
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flags = G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD |
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G_SPAWN_SEARCH_PATH_FROM_ENVP;
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output_mode = ga_parse_capture_output(capture_output);
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switch (output_mode) {
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case GUEST_EXEC_CAPTURE_OUTPUT_MODE_NONE:
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flags |= G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL;
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break;
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case GUEST_EXEC_CAPTURE_OUTPUT_MODE_STDOUT:
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has_output = true;
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flags |= G_SPAWN_STDERR_TO_DEV_NULL;
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break;
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case GUEST_EXEC_CAPTURE_OUTPUT_MODE_STDERR:
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has_output = true;
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flags |= G_SPAWN_STDOUT_TO_DEV_NULL;
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break;
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case GUEST_EXEC_CAPTURE_OUTPUT_MODE_SEPARATED:
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has_output = true;
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break;
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#if !defined(G_OS_WIN32)
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case GUEST_EXEC_CAPTURE_OUTPUT_MODE_MERGED:
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has_output = true;
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has_merge = true;
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break;
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#endif
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case GUEST_EXEC_CAPTURE_OUTPUT_MODE__MAX:
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/* Silence warning; impossible branch */
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break;
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}
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ret = g_spawn_async_with_pipes(NULL, argv, envp, flags,
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guest_exec_task_setup, &has_merge, &pid, input_data ? &in_fd : NULL,
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has_output ? &out_fd : NULL, has_output ? &err_fd : NULL, &gerr);
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if (!ret) {
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error_setg(errp, QERR_QGA_COMMAND_FAILED, gerr->message);
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g_error_free(gerr);
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goto done;
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}
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ge = g_new0(GuestExec, 1);
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ge->pid = gpid_to_int64(pid);
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gei = guest_exec_info_add(pid);
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gei->has_output = has_output;
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g_child_watch_add(pid, guest_exec_child_watch, gei);
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if (input_data) {
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gei->in.data = g_steal_pointer(&input);
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gei->in.size = ninput;
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#ifdef G_OS_WIN32
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in_ch = g_io_channel_win32_new_fd(in_fd);
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|
#else
|
|
in_ch = g_io_channel_unix_new(in_fd);
|
|
#endif
|
|
g_io_channel_set_encoding(in_ch, NULL, NULL);
|
|
g_io_channel_set_buffered(in_ch, false);
|
|
g_io_channel_set_flags(in_ch, G_IO_FLAG_NONBLOCK, NULL);
|
|
g_io_channel_set_close_on_unref(in_ch, true);
|
|
g_io_add_watch(in_ch, G_IO_OUT, guest_exec_input_watch, &gei->in);
|
|
}
|
|
|
|
if (has_output) {
|
|
#ifdef G_OS_WIN32
|
|
out_ch = g_io_channel_win32_new_fd(out_fd);
|
|
err_ch = g_io_channel_win32_new_fd(err_fd);
|
|
#else
|
|
out_ch = g_io_channel_unix_new(out_fd);
|
|
err_ch = g_io_channel_unix_new(err_fd);
|
|
#endif
|
|
g_io_channel_set_encoding(out_ch, NULL, NULL);
|
|
g_io_channel_set_encoding(err_ch, NULL, NULL);
|
|
g_io_channel_set_buffered(out_ch, false);
|
|
g_io_channel_set_buffered(err_ch, false);
|
|
g_io_channel_set_close_on_unref(out_ch, true);
|
|
g_io_channel_set_close_on_unref(err_ch, true);
|
|
g_io_add_watch(out_ch, G_IO_IN | G_IO_HUP,
|
|
guest_exec_output_watch, &gei->out);
|
|
g_io_add_watch(err_ch, G_IO_IN | G_IO_HUP,
|
|
guest_exec_output_watch, &gei->err);
|
|
}
|
|
|
|
done:
|
|
g_free(argv);
|
|
g_free(envp);
|
|
|
|
return ge;
|
|
}
|
|
|
|
/* Convert GuestFileWhence (either a raw integer or an enum value) into
|
|
* the guest's SEEK_ constants. */
|
|
int ga_parse_whence(GuestFileWhence *whence, Error **errp)
|
|
{
|
|
/*
|
|
* Exploit the fact that we picked values to match QGA_SEEK_*;
|
|
* however, we have to use a temporary variable since the union
|
|
* members may have different size.
|
|
*/
|
|
if (whence->type == QTYPE_QSTRING) {
|
|
int value = whence->u.name;
|
|
whence->type = QTYPE_QNUM;
|
|
whence->u.value = value;
|
|
}
|
|
switch (whence->u.value) {
|
|
case QGA_SEEK_SET:
|
|
return SEEK_SET;
|
|
case QGA_SEEK_CUR:
|
|
return SEEK_CUR;
|
|
case QGA_SEEK_END:
|
|
return SEEK_END;
|
|
}
|
|
error_setg(errp, "invalid whence code %"PRId64, whence->u.value);
|
|
return -1;
|
|
}
|
|
|
|
GuestHostName *qmp_guest_get_host_name(Error **errp)
|
|
{
|
|
GuestHostName *result = NULL;
|
|
g_autofree char *hostname = qga_get_host_name(errp);
|
|
|
|
/*
|
|
* We want to avoid using g_get_host_name() because that
|
|
* caches the result and we wouldn't reflect changes in the
|
|
* host name.
|
|
*/
|
|
|
|
if (!hostname) {
|
|
hostname = g_strdup("localhost");
|
|
}
|
|
|
|
result = g_new0(GuestHostName, 1);
|
|
result->host_name = g_steal_pointer(&hostname);
|
|
return result;
|
|
}
|
|
|
|
GuestTimezone *qmp_guest_get_timezone(Error **errp)
|
|
{
|
|
GuestTimezone *info = NULL;
|
|
GTimeZone *tz = NULL;
|
|
gint64 now = 0;
|
|
gint32 intv = 0;
|
|
gchar const *name = NULL;
|
|
|
|
info = g_new0(GuestTimezone, 1);
|
|
tz = g_time_zone_new_local();
|
|
if (tz == NULL) {
|
|
error_setg(errp, QERR_QGA_COMMAND_FAILED,
|
|
"Couldn't retrieve local timezone");
|
|
goto error;
|
|
}
|
|
|
|
now = g_get_real_time() / G_USEC_PER_SEC;
|
|
intv = g_time_zone_find_interval(tz, G_TIME_TYPE_UNIVERSAL, now);
|
|
info->offset = g_time_zone_get_offset(tz, intv);
|
|
name = g_time_zone_get_abbreviation(tz, intv);
|
|
if (name != NULL) {
|
|
info->zone = g_strdup(name);
|
|
}
|
|
g_time_zone_unref(tz);
|
|
|
|
return info;
|
|
|
|
error:
|
|
g_free(info);
|
|
return NULL;
|
|
}
|
|
|
|
GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
|
|
int64_t count, Error **errp)
|
|
{
|
|
GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
|
|
GuestFileRead *read_data;
|
|
|
|
if (!gfh) {
|
|
return NULL;
|
|
}
|
|
if (!has_count) {
|
|
count = QGA_READ_COUNT_DEFAULT;
|
|
} else if (count < 0 || count > GUEST_FILE_READ_COUNT_MAX) {
|
|
error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
|
|
count);
|
|
return NULL;
|
|
}
|
|
|
|
read_data = guest_file_read_unsafe(gfh, count, errp);
|
|
if (!read_data) {
|
|
slog("guest-file-write failed, handle: %" PRId64, handle);
|
|
}
|
|
|
|
return read_data;
|
|
}
|
|
|
|
int64_t qmp_guest_get_time(Error **errp)
|
|
{
|
|
return g_get_real_time() * 1000;
|
|
}
|