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SubjectRe: [security]: kernel ioctl()'s [3]


On Fri, 2 Jul 1999, Chris Evans wrote:

> Because programs running as root assume
>
> open("blah", O_RDWR)
> write(blah)
>
> will work.

Take a program running as root. Take a CD. Mount it. root is *not*
guaranteed to have everything writable.

> They do NOT expect to have to
>
> open("blah", O_RDWR)
> if (-EPERM)
> chflags("blah", immutable off)
> open("blah", O_RDWR)

Indeed. Case when it would matter, please? Notice that all derivatives of
4.4BSD have independent system and user flags. If you can find security
problems with that - share, I would like to look at the reaction of Theo ;-)


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