4:50 a.m.
According to the following valgrind output, there seems to be a
invalid limit for the iterator (captured on Fedora 19):
==3945== Invalid read of size 1
==3945== at 0x1E1FA410: libxlVmStart (libxl_driver.c:475)
==3945== by 0x1E1FAD9A: libxlDomainCreateWithFlags (libxl_driver.c:2633)
==3945== by 0x5187D46: virDomainCreate (libvirt.c:9439)
==3945== by 0x13BAA6: remoteDispatchDomainCreateHelper (remote_dispatch.h:2910)
==3945== by 0x51DE5B9: virNetServerProgramDispatch (virnetserverprogram.c:435)
==3945== by 0x51D93E7: virNetServerHandleJob (virnetserver.c:165)
==3945== by 0x50F5BF4: virThreadPoolWorker (virthreadpool.c:144)
==3945== by 0x50F5670: virThreadHelper (virthreadpthread.c:161)
==3945== by 0x8046C52: start_thread (pthread_create.c:308)
==3945== by 0x8758E1C: clone (clone.S:113)
==3945== Address 0x23424d81 is 0 bytes after a block of size 1 alloc'd
==3945== at 0x4A08121: calloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==3945== by 0x50B1F8C: virAllocN (viralloc.c:189)
==3945== by 0x1E1FA3CA: libxlVmStart (libxl_driver.c:468)
==3945== by 0x1E1FAD9A: libxlDomainCreateWithFlags (libxl_driver.c:2633)
==3945== by 0x5187D46: virDomainCreate (libvirt.c:9439)
==3945== by 0x13BAA6: remoteDispatchDomainCreateHelper (remote_dispatch.h:2910)
==3945== by 0x51DE5B9: virNetServerProgramDispatch (virnetserverprogram.c:435)
==3945== by 0x51D93E7: virNetServerHandleJob (virnetserver.c:165)
==3945== by 0x50F5BF4: virThreadPoolWorker (virthreadpool.c:144)
==3945== by 0x50F5670: virThreadHelper (virthreadpthread.c:161)
==3945== by 0x8046C52: start_thread (pthread_create.c:308)
==3945== by 0x8758E1C: clone (clone.S:113)
==3945==
Related: https://bugzilla.redhat.com/show_bug.cgi?id=1013045
Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com>
---
src/libxl/libxl_driver.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index e2a6d44..4928695 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -454,6 +454,7 @@ libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver,
virDomainObjPtr vm)
size_t cpumaplen;
int vcpu;
size_t i;
+ size_t limit;
int ret = -1;
if (libxlDoNodeGetInfo(driver, &nodeinfo) < 0)
@@ -470,7 +471,8 @@ libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver,
virDomainObjPtr vm)
cpumask = (uint8_t*) def->cputune.vcpupin[vcpu]->cpumask;
- for (i = 0; i < VIR_DOMAIN_CPUMASK_LEN; ++i) {
+ limit = MIN(VIR_DOMAIN_CPUMASK_LEN, cpumaplen);
+ for (i = 0; i < limit; ++i) {
if (cpumask[i])
VIR_USE_CPU(cpumap, i);
}
--
1.8.4
4:57 a.m.
On Thu, Oct 24, 2013 at 10:50:02AM +0100, Martin Kletzander wrote:
According to the following valgrind output, there seems to be a
invalid limit for the iterator (captured on Fedora 19):
==3945== Invalid read of size 1
==3945== at 0x1E1FA410: libxlVmStart (libxl_driver.c:475)
==3945== by 0x1E1FAD9A: libxlDomainCreateWithFlags (libxl_driver.c:2633)
==3945== by 0x5187D46: virDomainCreate (libvirt.c:9439)
==3945== by 0x13BAA6: remoteDispatchDomainCreateHelper (remote_dispatch.h:2910)
==3945== by 0x51DE5B9: virNetServerProgramDispatch (virnetserverprogram.c:435)
==3945== by 0x51D93E7: virNetServerHandleJob (virnetserver.c:165)
==3945== by 0x50F5BF4: virThreadPoolWorker (virthreadpool.c:144)
==3945== by 0x50F5670: virThreadHelper (virthreadpthread.c:161)
==3945== by 0x8046C52: start_thread (pthread_create.c:308)
==3945== by 0x8758E1C: clone (clone.S:113)
==3945== Address 0x23424d81 is 0 bytes after a block of size 1 alloc'd
==3945== at 0x4A08121: calloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==3945== by 0x50B1F8C: virAllocN (viralloc.c:189)
==3945== by 0x1E1FA3CA: libxlVmStart (libxl_driver.c:468)
==3945== by 0x1E1FAD9A: libxlDomainCreateWithFlags (libxl_driver.c:2633)
==3945== by 0x5187D46: virDomainCreate (libvirt.c:9439)
==3945== by 0x13BAA6: remoteDispatchDomainCreateHelper (remote_dispatch.h:2910)
==3945== by 0x51DE5B9: virNetServerProgramDispatch (virnetserverprogram.c:435)
==3945== by 0x51D93E7: virNetServerHandleJob (virnetserver.c:165)
==3945== by 0x50F5BF4: virThreadPoolWorker (virthreadpool.c:144)
==3945== by 0x50F5670: virThreadHelper (virthreadpthread.c:161)
==3945== by 0x8046C52: start_thread (pthread_create.c:308)
==3945== by 0x8758E1C: clone (clone.S:113)
==3945==
Related: https://bugzilla.redhat.com/show_bug.cgi?id=1013045
Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com>
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index e2a6d44..4928695 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -454,6 +454,7 @@ libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver,
virDomainObjPtr vm)
size_t cpumaplen;
int vcpu;
size_t i;
+ size_t limit;
int ret = -1;
if (libxlDoNodeGetInfo(driver, &nodeinfo) < 0)
@@ -470,7 +471,8 @@ libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver,
virDomainObjPtr vm)
cpumask = (uint8_t*) def->cputune.vcpupin[vcpu]->cpumask;
- for (i = 0; i < VIR_DOMAIN_CPUMASK_LEN; ++i) {
+ limit = MIN(VIR_DOMAIN_CPUMASK_LEN, cpumaplen);
+ for (i = 0; i < limit; ++i) {
if (cpumask[i])
VIR_USE_CPU(cpumap, i);
}
Hmm, what is strange about that bug is that the crash is in free() wrt
memory corruption, but valgrind only reports bogus reads. Such a crash
in free() usually implies a bogus write. The VIR_USE_CPU macro does
do such a write though, so the patch looks sane - valgrind must have
just not seen it
ACK
Daniel
--
|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org -o- http://virt-manager.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
5:24 a.m.
On Thu, Oct 24, 2013 at 10:57:37AM +0100, Daniel P. Berrange wrote:
On Thu, Oct 24, 2013 at 10:50:02AM +0100, Martin Kletzander wrote:
> According to the following valgrind output, there seems to be a
> invalid limit for the iterator (captured on Fedora 19):
>
> ==3945== Invalid read of size 1
> ==3945== at 0x1E1FA410: libxlVmStart (libxl_driver.c:475)
> ==3945== by 0x1E1FAD9A: libxlDomainCreateWithFlags (libxl_driver.c:2633)
> ==3945== by 0x5187D46: virDomainCreate (libvirt.c:9439)
> ==3945== by 0x13BAA6: remoteDispatchDomainCreateHelper (remote_dispatch.h:2910)
> ==3945== by 0x51DE5B9: virNetServerProgramDispatch (virnetserverprogram.c:435)
> ==3945== by 0x51D93E7: virNetServerHandleJob (virnetserver.c:165)
> ==3945== by 0x50F5BF4: virThreadPoolWorker (virthreadpool.c:144)
> ==3945== by 0x50F5670: virThreadHelper (virthreadpthread.c:161)
> ==3945== by 0x8046C52: start_thread (pthread_create.c:308)
> ==3945== by 0x8758E1C: clone (clone.S:113)
> ==3945== Address 0x23424d81 is 0 bytes after a block of size 1 alloc'd
> ==3945== at 0x4A08121: calloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==3945== by 0x50B1F8C: virAllocN (viralloc.c:189)
> ==3945== by 0x1E1FA3CA: libxlVmStart (libxl_driver.c:468)
> ==3945== by 0x1E1FAD9A: libxlDomainCreateWithFlags (libxl_driver.c:2633)
> ==3945== by 0x5187D46: virDomainCreate (libvirt.c:9439)
> ==3945== by 0x13BAA6: remoteDispatchDomainCreateHelper (remote_dispatch.h:2910)
> ==3945== by 0x51DE5B9: virNetServerProgramDispatch (virnetserverprogram.c:435)
> ==3945== by 0x51D93E7: virNetServerHandleJob (virnetserver.c:165)
> ==3945== by 0x50F5BF4: virThreadPoolWorker (virthreadpool.c:144)
> ==3945== by 0x50F5670: virThreadHelper (virthreadpthread.c:161)
> ==3945== by 0x8046C52: start_thread (pthread_create.c:308)
> ==3945== by 0x8758E1C: clone (clone.S:113)
> ==3945==
>
> Related: https://bugzilla.redhat.com/show_bug.cgi?id=1013045
> Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com>
>
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index e2a6d44..4928695 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -454,6 +454,7 @@ libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver,
virDomainObjPtr vm)
> size_t cpumaplen;
> int vcpu;
> size_t i;
> + size_t limit;
> int ret = -1;
>
> if (libxlDoNodeGetInfo(driver, &nodeinfo) < 0)
> @@ -470,7 +471,8 @@ libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver,
virDomainObjPtr vm)
>
> cpumask = (uint8_t*) def->cputune.vcpupin[vcpu]->cpumask;
>
> - for (i = 0; i < VIR_DOMAIN_CPUMASK_LEN; ++i) {
> + limit = MIN(VIR_DOMAIN_CPUMASK_LEN, cpumaplen);
> + for (i = 0; i < limit; ++i) {
> if (cpumask[i])
> VIR_USE_CPU(cpumap, i);
> }
Hmm, what is strange about that bug is that the crash is in free() wrt
memory corruption, but valgrind only reports bogus reads. Such a crash
in free() usually implies a bogus write. The VIR_USE_CPU macro does
do such a write though, so the patch looks sane - valgrind must have
just not seen it
It points to another problem in libxl which I don't have set up to use
(and have nowhere to try it), but I can hardly suspect that issue
would corrupt libvirt's memory.
ACK
Thanks, pushed.
Martin
Daniel
--
|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org -o- http://virt-manager.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
4081
days inactive
4081
days old
2 comments
2 participants
participants (2)
-
Daniel P. Berrange -
Martin Kletzander