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Re: [libvirt] [PATCH] Change label of fusefs mounted at /proc/meminfo in lxc containers



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On 05/16/2013 12:09 PM, Daniel P. Berrange wrote:
> On Thu, May 16, 2013 at 05:04:06PM +0100, Daniel P. Berrange wrote:
>> On Wed, May 15, 2013 at 10:35:48AM -0400, dwalsh redhat com wrote:
>>> From: Dan Walsh <dwalsh redhat com>
>>> 
>>> We do not want to allow contained applications to be able to read
>>> fusefs_t. So we want /proc/meminfo label to match the system default
>>> proc_t.
>>> 
>>> Fix checking of error codes --- src/lxc/lxc_container.c | 24
>>> ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
>>> 
>>> diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c index
>>> 8e1d10a..8c0edb0 100644 --- a/src/lxc/lxc_container.c +++
>>> b/src/lxc/lxc_container.c @@ -52,6 +52,10 @@ # include <blkid/blkid.h> 
>>> #endif
>>> 
>>> +#if WITH_SELINUX +# include <selinux/selinux.h> +#endif + #include
>>> "virerror.h" #include "virlog.h" #include "lxc_container.h" @@ -761,6
>>> +765,26 @@ static int lxcContainerMountProcFuse(virDomainDefPtr def, 
>>> def->name)) < 0) return ret;
>>> 
>>> +#if WITH_SELINUX +    if (is_selinux_enabled() > 0) { +
>>> security_context_t scon; +        ret = getfilecon("/proc/meminfo",
>>> &scon); +        if (ret < 0) { +
>>> virReportSystemError(errno, +                                 _("Failed
>>> to get security context of %s for /proc/meminfo mount point"), +
>>> meminfo_path); +            return ret; +        } +        ret =
>>> setfilecon(meminfo_path, scon); +        freecon(scon); +        if
>>> (ret < 0) { +            virReportSystemError(errno, +
>>> _("Failed to set security context of %s for /proc/meminfo mount
>>> point"), +                                 meminfo_path);
>> 
>> So I'm not unable to start any containers with this patch applied:
>> 
>> 2013-05-16 16:01:47.835+0000: 1: error : lxcContainerMountProcFuse:787 :
>> Failed to set security context of
>> /.oldroot//run/libvirt/lxc/busy.fuse/meminfo for /proc/meminfo mount
>> point: Operation not supported
>> 
>> 
>> What distro + kernel version did you test this with ?  I'm using current 
>> F19 with kernel 3.9.0-0.rc8.git0.2.fc19.x86_64 when I see the failure
> 
> Indeed, even trying to change it manually fails
> 
> # chcon system_u:object_r:proc_t:s0 /proc/8180/root/proc/meminfo chcon:
> failed to change context of ‘/proc/8180/root/proc/meminfo’ to
> ‘system_u:object_r:proc_t:s0’: Operation not supported
> 
> 
> 
> Daniel
> 
Revert the patch, I could swear this was working before, but it is not now.
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