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util: fix mount issue by moving NULL value to "none" in syscall.

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After running libvirt daemon with valgrind tools, some errors are
appearing when you try to start a domain. One example:

==18012== Syscall param mount(type) points to unaddressable byte(s)
==18012==    at 0x6FEE3CA: mount (syscall-template.S:78)
==18012==    by 0x531344D: virFileMoveMount (virfile.c:3828)
==18012==    by 0x27FE7675: qemuDomainBuildNamespace (qemu_domain.c:11501)
==18012==    by 0x2800C44E: qemuProcessHook (qemu_process.c:2870)
==18012==    by 0x52F7E1D: virExec (vircommand.c:726)
==18012==    by 0x52F7E1D: virCommandRunAsync (vircommand.c:2477)
==18012==    by 0x52F4EDD: virCommandRun (vircommand.c:2309)
==18012==    by 0x2800A731: qemuProcessLaunch (qemu_process.c:6235)
==18012==    by 0x2800D6B4: qemuProcessStart (qemu_process.c:6569)
==18012==    by 0x28074876: qemuDomainObjStart (qemu_driver.c:7314)
==18012==    by 0x280522EB: qemuDomainCreateWithFlags (qemu_driver.c:7367)
==18012==    by 0x55484BF: virDomainCreate (libvirt-domain.c:6531)
==18012==    by 0x12CDBD: remoteDispatchDomainCreate (remote_daemon_dispatch_stubs.h:4350)
==18012==    by 0x12CDBD: remoteDispatchDomainCreateHelper (remote_daemon_dispatch_stubs.h:4326)
==18012==  Address 0x0 is not stack'd, malloc'd or (recently) free'd

Some documentation recommends to use "none" when you don't have a
filesystem type to use. Specially, for bind and move actions.

Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
This commit is contained in:
Julio Faracco 2018-06-26 00:18:21 -03:00 committed by Michal Privoznik
parent 0ec6343a06
commit 794b576c2b
2 changed files with 2 additions and 2 deletions
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2
src/util/virfile.c
View File

@ -3825,7 +3825,7 @@ virFileMoveMount(const char *src,
{
const unsigned long mount_flags = MS_MOVE;
if (mount(src, dst, NULL, mount_flags, NULL) < 0) {
if (mount(src, dst, "none", mount_flags, NULL) < 0) {
virReportSystemError(errno,
_("Unable to move %s mount to %s"),
src, dst);

2
src/util/virprocess.c
View File

@ -1181,7 +1181,7 @@ virProcessSetupPrivateMountNS(void)
goto cleanup;
}
if (mount("", "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
if (mount("", "/", "none", MS_SLAVE|MS_REC, NULL) < 0) {
virReportSystemError(errno, "%s",
_("Failed to switch root mount into slave mode"));
goto cleanup;