linux-kernel - Re: [PATCH] security: selinux: allow changing labels for cgroupfs

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Date:   Thu, 2 Feb 2017 16:35:29 +0100
From:   Antonio Murdaca <amurdaca@...hat.com>
To:     selinux@...ho.nsa.gov, Antonio Murdaca <amurdaca@...hat.com>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] security: selinux: allow changing labels for cgroupfs

On Thu, Feb 2, 2017 at 4:01 PM, Gary Tierney <gary.tierney@....com> wrote:
> On Thu, Feb 02, 2017 at 03:42:28PM +0100, Antonio Murdaca wrote:
>> This patch allows changing labels for cgroup mounts. Previously, running
>> chcon on cgroupfs would throw an "Operation not supported". This patch
>> specifically whitelist cgroupfs.
>>
>> The patch could also allow containers to write only to the systemd cgroup
>> for instance, while the other cgroups are kept with cgroup_t label.
>>
>> Signed-off-by: Antonio Murdaca <runcom@...hat.com>
>> ---
>>  security/selinux/hooks.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
>> index 3b955c6..4e84211 100644
>> --- a/security/selinux/hooks.c
>> +++ b/security/selinux/hooks.c
>> @@ -480,6 +480,7 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
>>               sbsec->behavior == SECURITY_FS_USE_NATIVE ||
>>               /* Special handling. Genfs but also in-core setxattr handler */
>>               !strcmp(sb->s_type->name, "sysfs") ||
>> +             !strcmp(sb->s_type->name, "cgroup") ||
>
> Should we also include "cgroup2" here, since they are defined as 2
> distinct filesystems? https://github.com/SELinuxProject/selinux-kernel/blob/master/kernel/cgroup.c#L2314-L2326

likely yes

>
>>               !strcmp(sb->s_type->name, "pstore") ||
>>               !strcmp(sb->s_type->name, "debugfs") ||
>>               !strcmp(sb->s_type->name, "tracefs") ||
>> --
>> 2.9.3
>>
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-- 
Antonio (runcom) Murdaca, RHCE
Senior Software Engineer - Containers
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