linux-ext4 - [Bug 13909] md5sum on 3GB file is constantly hanging

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Date:	Tue, 11 Aug 2009 18:47:03 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 13909] md5sum on 3GB file is constantly hanging

http://bugzilla.kernel.org/show_bug.cgi?id=13909





--- Comment #26 from Roland Kletzing <devzero@....de>  2009-08-11 18:47:01 ---
we got some feedback from the ima developers:

>> > > if this is a bug fixed in .31 (perhaps http://git.kernel.org/?>p=linux/kernel/git/torvalds/linux->2.6.git;a=commit;h=1a62e958fa4aaeeb752311b4f5e16b2a86737b23
>> > > ???) , shouldn`t that go to -stable, too ?
>> > 
>> > Yes, it's in 2.6.30.1.
>> 
>> so, is the reported one perhaps another issue? 
>> the user with that problem is using 2.6.30.4
>
>No, I don't think so. The default measurement policy in 2.6.30 measures
>all executables and all files opened for read by root. For 2.6.31, this
>policy is enabled only if the kernel command line option "ima_tcb=1" is
>specified.
>
>You're probably opening a 3GB file for read as root, which causes the
>file to be measured, not really something you'd want to do as it takes a
>real long time. Depending on what is causing the file to be measured,
>you could run the app as user. The other option is to modify the IMA
>measurement policy. (Refer to
>linux-2.6.30.X/Documentation/ABI/testing/ima_policy.)
>
>Mimi


so, before closing, it would make sense if you could do the following (with ima
enabled):

1. do the tests (md5sum/dd) as non-root user. that should make a difference
2. do the test with a 1gb, 2gb and 3gb file and check the time needed to
complete. does that scale linear? does the 2gb complete in reasonable time, but
not the 3gb file ?

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