Re: Fwd: Started to get "memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL"

[Vlastimil Babka]

On 6/1/23 04:07, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
>> Recent kernels seem to generate this:
>> 
>> "memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=3976 'Xorg'"
>> 
>> Is this a kernel problem or something to do with Xorg ?
>> 
>> Seen in Kernels 6.3.4 and 6.4.0-rc4.
>> 
>> Thanks
> 
> See Bugzilla for the full thread and attached logs (dmesg, xorg, bisection
> log).
> 
> Anyway, I'm adding it to regzbot:
> 
> #regzbot introduced: 105ff5339f498a https://bugzilla.kernel.org/show_bug.cgi?id=217508
> #regzbot title: memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL on Xorg

Hm indeed it seems to have introduced 2 new flags and immediately warn if
any process doesn't use them. Maybe it would make sense for some of the
non-default values of vm.memfd_noexec, but it's too early to warn
unconditionally everywhere, no?

> Thanks.
> 
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217508
>