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Re: rx2660 + debian


On 4/26/22 04:43, Pedro Miguel Justo wrote:
> So, I finished compiling my kernel with CONFIG_HARDENED_USERCOPY disabled. Guess what:
> pmsjt@debian:~$ uname -a
> Linux debian 5.17.3-rt17 #2 SMP Mon Apr 25 16:55:00 PDT 2022 ia64 GNU/Linux
> Yup, the system starts just fine with the most recent kernel. So, two things we can infer from this:
> - Yes, usercopy validation appears to be broken. The contours of how broken it is are yet unknown
    but we’ll have to investigate to see what part of the validation is failing.
> - hardened_usercopy=off seems to be ignored by current kernels. When passing this option the system
    was still failing just the same.

We can certainly send a pull request to the Debian kernel packaging repository to disable
CONFIG_HARDENED_USERCOPY although I'm not sure what ramifications that would have.

But since the feature is broken on Itanium anyway, I guess it won't hurt.


 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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