Drawing lessons from fatal SELinux bug #1054350

Chris Murphy lists at colorremedies.com
Sat Jan 25 23:42:13 UTC 2014


On Jan 25, 2014, at 9:46 AM, Tomasz Torcz <tomek at pipebreaker.pl> wrote:

> On Fri, Jan 24, 2014 at 03:10:04PM -0700, Chris Murphy wrote:
>> 
>> Another possible case it's /etc/ where the either a package or the user could
>> make changes during the update. Btrfs allows per file snapshots with cp
>> --reflink so there might be a way to carve the snapshot with a scalpel but I
>> prefer doing it with subvolume granularity. Plus that granularity translates to
>> LVM.  
> 
>  Note that this situation is perfectly handled by Offline Updates.
> After reboot, there aren't collateral changes to filesystem, only upgrade-related
> ones. So if there's a need for revert, the previous state is clearly defined.

I don't follow this. The realization an update is bad doesn't necessarily occur right away. So we still need a way to separate system domain vs user domain, at least, so that system files are rolled back separately from user files.


Chris Murphy



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