Re: [PATCH bpf] lib/buildid: handle memfd_secret() files in build_id_parse()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Oct 17, 2024 at 11:17:19AM GMT, David Hildenbrand wrote:
> On 16.10.24 20:39, Shakeel Butt wrote:
> > Ccing couple more folks who are doing similar work (ASI, guest_memfd)
> > 
> > Folks, what is the generic way to check if a given mapping has folios
> > unmapped from kernel address space?
> 
> 
> Can't we just lookup the mapping and refuse these folios that really
> shouldn't be looked at?
> 
> See gup_fast_folio_allowed() where we refuse secretmem_mapping().

That is exactly what this patch is doing. See [1]. The reason I asked
this question was because I see parallel efforts related to guest_memfd
and ASI are going to unmap folios from direct map. (Yosry already
explained ASI is a bit different). We want a more robust and future
proof solution.


[1] https://lore.kernel.org/all/20241014235631.1229438-1-andrii@xxxxxxxxxx/

> 
> 
> -- 
> Cheers,
> 
> David / dhildenb
> 




[Index of Archives]     [Linux Samsung SoC]     [Linux Rockchip SoC]     [Linux Actions SoC]     [Linux for Synopsys ARC Processors]     [Linux NFS]     [Linux NILFS]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]


  Powered by Linux