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rpc: avoid crash when system time jump back

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Setting the system time backward would lead to a
 multiplication overflow in function virKeepAliveStart.
 The function virKeepAliveTimerInternal got the same bug too.

 Backtrace below:
 #0  0x0000ffffae898470 in raise () from /usr/lib64/libc.so.6
 #1  0x0000ffffae89981c in abort () from /usr/lib64/libc.so.6
 #2  0x0000ffffaf9a36a8 in __mulvsi3 () from /usr/lib64/libvirt.so.0
 #3  0x0000ffffaf8fd9e8 in virKeepAliveStart (ka=0xaaaaf954ce10, interval=interval entry=0,
     count=count entry=0) at ../../src/rpc/virkeepalive.c:283
 #4  0x0000ffffaf908560 in virNetServerClientStartKeepAlive (client=0xaaaaf954cbe0)
     at ../../src/rpc/virnetserverclient.c:1628
 #5  0x0000aaaac57eb6dc in remoteDispatchConnectSupportsFeature (server=0xaaaaf95309d0,
     msg=0xaaaaf9549d90, ret=0xffff8c007fc0, args=0xffff8c002e70, rerr=0xffff9ea054a0,
     client=0xaaaaf954cbe0) at ../../src/remote/remote_daemon_dispatch.c:5063
 #6  remoteDispatchConnectSupportsFeatureHelper (server=0xaaaaf95309d0, client=0xaaaaf954cbe0,
     msg=0xaaaaf9549d90, rerr=0xffff9ea054a0, args=0xffff8c002e70, ret=0xffff8c007fc0)
     at ./remote/remote_daemon_dispatch_stubs.h:3503
 #7  0x0000ffffaf9053a4 in virNetServerProgramDispatchCall(msg=0xaaaaf9549d90, client=0xaaaaf954cbe0,
     server=0x0, prog=0xaaaaf953a170) at ../../src/rpc/virnetserverprogram.c:451
 #8  virNetServerProgramDispatch (prog=0xaaaaf953a170, server=0x0, server entry=0xaaaaf95309d0,
     client=0xaaaaf954cbe0, msg=0xaaaaf9549d90) at ../../src/rpc/virnetserverprogram.c:306
 #9  0x0000ffffaf90a6bc in virNetServerProcessMsg (msg=<optimized out>, prog=<optimized out>,
     client=<optimized out>, srv=0xaaaaf95309d0) at ../../src/rpc/virnetserver.c:137
 #10 virNetServerHandleJob (jobOpaque=0xaaaaf950df80, opaque=0xaaaaf95309d0)
     at ../../src/rpc/virnetserver.c:154
 #11 0x0000ffffaf812e14 in virThreadPoolWorker (opaque=<optimized out>)
     at ../../src/util/virthreadpool.c:163
 #12 0x0000ffffaf81237c in virThreadHelper (data=<optimized out>) at ../../src/util/virthread.c:246
 #13 0x0000ffffaea327ac in ?? () from /usr/lib64/libpthread.so.0
 #14 0x0000ffffae93747c in ?? () from /usr/lib64/libc.so.6
 (gdb) frame 3
 #3  0x0000ffffaf8fd9e8 in virKeepAliveStart (ka=0xaaaaf954ce10, interval=interval entry=0,
     count=count entry=0) at ../../src/rpc/virkeepalive.c:283
 283            timeout = ka->interval - delay;
 (gdb) list
 278    now = time(NULL);
 279    delay = now - ka->lastPacketReceived; <='delay' got a negative value
 280    if (delay > ka->interval)
 281        timeout = 0;
 282    else
 283        timeout = ka->interval - delay;
 284    ka->intervalStart = now - (ka->interval - timeout);
 285    ka->timer = virEventAddTimeout(timeout * 1000, virKeepAliveTimer, <= multiplication overflow
 286                                   ka, virObjectFreeCallback);
 287    if (ka->timer < 0)
 (gdb) p now
 $2 = 18288001
 (gdb) p ka->lastPacketReceived
 $3 = 1609430405

Signed-off-by: BiaoXiang Ye <yebiaoxiang@huawei.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
BiaoXiang Ye 2021-02-10 05:58:05 +00:00 committed by Ján Tomko
parent 6f8a8671cc
commit 613e994af0
1 changed files with 8 additions and 7 deletions
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15
src/rpc/virkeepalive.c
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@ -40,8 +40,8 @@ struct _virKeepAlive {
int interval;
unsigned int count;
unsigned int countToDeath;
time_t lastPacketReceived;
time_t intervalStart;
gint64 lastPacketReceived;
gint64 intervalStart;
int timer;
virKeepAliveSendFunc sendCB;
@ -113,7 +113,7 @@ static bool
virKeepAliveTimerInternal(virKeepAlivePtr ka,
virNetMessagePtr *msg)
{
time_t now = time(NULL);
gint64 now = g_get_monotonic_time() / G_USEC_PER_SEC;
int timeval;
if (ka->interval <= 0 || ka->intervalStart == 0)
@ -231,9 +231,9 @@ virKeepAliveStart(virKeepAlivePtr ka,
unsigned int count)
{
int ret = -1;
time_t delay;
gint64 delay;
int timeout;
time_t now;
gint64 now;
virObjectLock(ka);
@ -270,7 +270,7 @@ virKeepAliveStart(virKeepAlivePtr ka,
"ka=%p client=%p interval=%d count=%u",
ka, ka->client, interval, count);
now = time(NULL);
now = g_get_monotonic_time() / G_USEC_PER_SEC;
delay = now - ka->lastPacketReceived;
if (delay > ka->interval)
timeout = 0;
@ -375,7 +375,8 @@ virKeepAliveCheckMessage(virKeepAlivePtr ka,
virObjectLock(ka);
ka->countToDeath = ka->count;
ka->lastPacketReceived = ka->intervalStart = time(NULL);
ka->intervalStart = g_get_monotonic_time() / G_USEC_PER_SEC;
ka->lastPacketReceived = ka->intervalStart;
if (msg->header.prog == KEEPALIVE_PROGRAM &&
msg->header.vers == KEEPALIVE_PROTOCOL_VERSION &&