RE: [PATCH] quick selinux support for tracefs

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> -----Original Message-----
> From: Stephen Smalley [mailto:sds@xxxxxxxxxxxxx]
> Sent: Tuesday, December 6, 2016 9:41 AM
> To: Roberts, William C <william.c.roberts@xxxxxxxxx>; nnk@xxxxxxxxxx;
> selinux@xxxxxxxxxxxxx
> Cc: Yongqin Liu <yongqin.liu@xxxxxxxxxx>; Paul Moore <paul@xxxxxxxxxxxxxx>
> Subject: Re: [PATCH] quick selinux support for tracefs
> 
> On 12/06/2016 12:24 PM, william.c.roberts@xxxxxxxxx wrote:
> > From: Yongqin Liu <yongqin.liu@xxxxxxxxxx>
> >
> > Here is just the quick fix for tracefs with selinux.
> > just add tracefs to the list of whitelisted filesystem types in
> > selinux_is_sblabel_mnt(), but the right fix would be to generalize
> > this logic as described in the last item on the todo list,
> > https://bitbucket.org/seandroid/wiki/wiki/ToDo
> >
> > Change-Id: I2aa803ccffbcd2802a7287514da7648e6b364157
> 
> Please rewrite the subject line and patch description per the kernel's submission
> guidelines, drop the Change-Id and the link to the SEAndroid todo list, and don't
> say that this is a quick fix but

Why would anyone do that for this patch when below you say it won’t be merged unless
we fix issue #2?

the right fix is something else if you want this to
> actually be merged.  Because in that case, you ought to just implement the right
> fix.  There is now an upstream kernel issue for the right fix:
> https://github.com/SELinuxProject/selinux-kernel/issues/2

The other question here is tracefs safe to label in this fashion, I would assume yes.
Looking through I didn't see any eviction code.

> 
> > Signed-off-by: Yongqin Liu <yongqin.liu@xxxxxxxxxx>
> > ---
> >  security/selinux/hooks.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index
> > 09fd610..24bd84d 100644
> > --- a/security/selinux/hooks.c
> > +++ b/security/selinux/hooks.c
> > @@ -491,6 +491,7 @@ static int selinux_is_sblabel_mnt(struct super_block
> *sb)
> >  		!strcmp(sb->s_type->name, "sysfs") ||
> >  		!strcmp(sb->s_type->name, "pstore") ||
> >  		!strcmp(sb->s_type->name, "debugfs") ||
> > +		!strcmp(sb->s_type->name, "tracefs") ||
> >  		!strcmp(sb->s_type->name, "rootfs");  }
> >
> >


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