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Apparently, though unproven, at 23:01 on Saturday 11 September 2010, Nikos |
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Chantziaras did opine thusly: |
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> On 09/11/2010 11:49 PM, Dale wrote: |
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> > Nikos Chantziaras wrote: |
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> >> On 09/11/2010 11:35 PM, Dale wrote: |
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> >>> Alan McKinnon wrote: |
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> >>>> Apparently, though unproven, at 11:46 on Saturday 11 September 2010, |
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> >>>> Albert |
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> >>>> |
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> >>>> Hopkins did opine thusly: |
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> >>>>> On Sat, 2010-09-11 at 10:24 +0200, Stéphane Guedon wrote: |
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> >>>>>> few months ago, I read linux kernel in a nutschell(sic), and the |
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> >>>>>> author |
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> >>>>>> wrote we shouldn't do kernel operations (config and build) as root. |
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> >>>>> |
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> >>>>> I call bullsh*t. I've been compiling kernels for 17 years and for the |
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> >>>>> most part have done it as root without any problems. |
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> >>>> |
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> >>>> Same here. |
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> >>>> |
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> >>>> The root user (sometimes portage) creates /usr/src/linux-* |
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> >>>> |
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> >>>> Someone tell me again exactly how user alan is supposed to build those |
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> >>>> sources? |
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> >>> |
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> >>> If they are accessible by a user, couldn't a user then edit or add |
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> >>> something that would then cause a security problem? If they can edit |
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> >>> them and no one know it, then root comes along and builds a shiney new |
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> >>> kernel with a really nice security hole. |
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> >>> |
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> >>> Glad only root can get to the sources. ;-) |
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> >> |
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> >> No, any user can't edit them; only the user you assign the files to. |
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> >> If you assign them to root, only root can edit them. If you assign |
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> >> them to kerneluser, only kerneluser can edit them. |
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> >> |
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> >> This is Unix 101 :) |
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> > |
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> > My point was, if the sources are say in the user group, then any user |
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> > can edit them? Right now, they are in the root group and owned my root |
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> > which for security reasons is a good idea. That way a regular user can't |
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> > edit or modify the kernel sources. |
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> |
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> The group can only write if the files have the group write permission |
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> set. Still in Unix 101 domain, hehe :) |
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And you need write permission on the containing directory to create new files |
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or delete existing ones. Nothing to do with the permissions on the file |
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itself. |
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With this, I have moved us on to Unix 101a :-) |
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-- |
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alan dot mckinnon at gmail dot com |
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