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display: ensure qxl log_buf is a nul terminated string

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The QXL_IO_LOG command allows the guest to send log messages to the host
via a buffer in the QXLRam struct. QEMU prints these to the console if
the qxl 'guestdebug' option is set to non-zero. It will also feed them
to the trace subsystem if any backends are built-in.

In both cases the log_buf data will get treated as being as a nul
terminated string, by the printf '%s' format specifier and / or other
code reading the buffer.

QEMU does nothing to guarantee that the log_buf really is nul terminated,
so there is potential for out of bounds array access.

This would affect any QEMU which has the log, syslog or ftrace trace
backends built into QEMU. It can only be triggered if the 'qxl_io_log'
trace event is enabled, however, so they are not vulnerable without
specific administrative action to enable this.

It would also affect QEMU if the 'guestdebug' parameter is set to a
non-zero value, which again is not the default and requires explicit
admin opt-in.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20190123120016.4538-2-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-01-23 12:00:13 +00:00 • committed by Stefan Hajnoczi
parent f6b06fccee
commit 00f4269743
2 changed files with 11 additions and 5 deletions
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14
hw/display/qxl.c
View file

@ -1763,10 +1763,16 @@ async_common:
qxl_set_mode(d, val, 0);
break;
case QXL_IO_LOG:
trace_qxl_io_log(d->id, d->ram->log_buf);
if (d->guestdebug) {
fprintf(stderr, "qxl/guest-%d: %" PRId64 ": %s", d->id,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), d->ram->log_buf);
if (TRACE_QXL_IO_LOG_ENABLED || d->guestdebug) {
/* We cannot trust the guest to NUL terminate d->ram->log_buf */
char *log_buf = g_strndup((const char *)d->ram->log_buf,
sizeof(d->ram->log_buf));
trace_qxl_io_log(d->id, log_buf);
if (d->guestdebug) {
fprintf(stderr, "qxl/guest-%d: %" PRId64 ": %s", d->id,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), log_buf);
}
g_free(log_buf);
}
break;
case QXL_IO_RESET: