Re: Kernel panic at Ubuntu: IMA + Apparmor

Dmitry Kasatkin
2014-04-26T19:03:44Z

On 26 April 2014 20:42, Al Viro <viro@zeniv.linux.org.uk> wrote:
> On Sat, Apr 26, 2014 at 07:54:47PM +0300, Dmitry Kasatkin wrote:
>> On 26 April 2014 16:56, Al Viro <viro@zeniv.linux.org.uk> wrote:
>> > On Sat, Apr 26, 2014 at 11:58:45AM +0300, Dmitry Kasatkin wrote:
>> >
>> >> Conflict with Apparmor means with Ubuntu.
>> >>
>> >> But answering to your early question..
>> >> IMA does not want permission denied when measuring and re-measuring files.
>> >> may_open() is doing that job before.
>> >>
>> >> We need quickly introduce kernel_read without LSM checks...
>> >
>> > *snarl*
>> >
>> > What we need quickly is to introduce you to a textbook or two. As the
>> > matter of fact, in this case even wikipedia might suffice...
>> >
>>
>> Hopefully we have you who were introduced to a textbook or two about relevant
>> subject and able kindly help us with the solution instead of telling
>> me this crap...
>
> See the discussion of that very topic (required modifications of vfs_read())
> upthread. And Eric has a very good point about the usefulness of understanding
> the basics of IO-related system calls in Unix for anybody who does any
> kind of development related to keeping track of file contents modifications,
> etc. It's *not* about some arcane knowledge of VFS internals (which also might
> come handy when sticking hooks into said internals); it's about being familiar
> with the semantics of read(2) and related concepts.

Great. Teaching discussions are over?
So how we will solve the problem reported in this thread?

--
Thanks,
Dmitry