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Date: Sat, 24 Jul 2021 19:36:39 -0400
From: "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
To: musl@...ts.openwall.com, Yuri Kanivetsky <yuri.kanivetsky@...il.com>
Subject: Re: faccessat() always return EPERM
Excerpts from Rich Felker's message of July 23, 2021 9:40 pm:
> On Sat, Jul 24, 2021 at 04:16:25AM +0300, Yuri Kanivetsky wrote:
>> Hi,
>>
>> I'm not sure that it has something to do with musl. But experienced in
>> a Alpine Linux docker container (ruby:2.6-alpine3.14) on Debian 9 or
>> 10. I can't reproduce it with Alpine Linux 3.13 (container) or Debian
>> 8 (host).
>>
>> For example, the following program outputs -1:
>>
>> #include <stdio.h>
>> #include <fcntl.h>
>> #include <unistd.h>
>>
>> int main()
>> {
>> int r;
>> r = faccessat(AT_FDCWD, "/", R_OK, AT_EACCESS);
>> printf("%i", r);
>> return 0;
>> }
>>
>> I believe whatever is passed as the second parameter, it would return -1.
>>
>> As a result at least irb and bundler doesn't work. Is this some sort
>> of binary incompatibility with Linux kernel?
>
> No, it's almost surely Docker blocking the operation with the wrong
> error code (EPERM):
>
> https://github.com/opencontainers/runc/issues/2151
>
> I'm not sure what the status on getting fix deployed is. It might go
> away if the host running Docker can upgrade.
>
> Rich
>
https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.14.0#faccessat2
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