Re: [PATCH v2 0/2] exec: Avoid pathological argc, envc, and bprm->p values

[Guenter Roeck]

On 6/21/24 13:50, Kees Cook wrote:
> Hi,
>
> This pair of patches replaces the last patch in this[1] series.
>
> Perform bprm argument overflow checking but only do argmin checks for MMU
> systems. To avoid tripping over this again, argmin is explicitly defined
> only for CONFIG_MMU. Thank you to Guenter Roeck for finding this issue
> (again)!

That does make me wonder: Is anyone but me testing, much less running,
the nommu code in the kernel ?

mps2-an385 trips over the same problem, and xtensa:nommu_kc705_defconfig
doesn't even build in linux-next right now (spoiler alert: I suspect that
the problem is caused by "kunit: test: Add vm_mmap() allocation resource
manager", but I did not have time to bisect it).

I am kind of tired keeping those tests alive, and I would not exactly
shed tears if nommu support would just be dropped entirely.

Guenter