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

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(a)redhat.com wrote: >> From: Dan Walsh <dwalsh(a)redhat.com&gt; >> >> 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

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