Re: Bug#970460: qemu-user: trashes argv[0] breaking multi-call binaries

[Laurent Vivier <laurent@vivier.eu>]

Le 16/09/2020 à 19:53, Michael Tokarev a écrit :
> 16.09.2020 20:15, John Paul Adrian Glaubitz wrote:
>>
>>> On Sep 16, 2020, at 6:57 PM, Thorsten Glaser <tg@mirbsd.de> wrote:
>>>
>>> I’m attaching a test program that does the following:
>>>
>>> • if argv[1] is "-" it just outputs argv[0] and argv[1]
>>> • otherwise it also execve(2)s argv[1] with its argv[0] set to "meow"
>>
>> That’s been fixed upstream and can be configured with the qemu-binfmt.sh script and the option “preserved=yes”.
> 
> Where it's been fixed? current git version of scripts/qemu-binfmt-conf.sh
> does not have 'preserved' option, and if the P flag is set when registering
> binfmt, the kernel will _prepend_ additional argv[0] element which is not
> expected by current linux-user/main.c code (so the tst.c example will be
> running with 3 args, not 2).

Yes, it's not fixed.

For 10 months I'm trying to have a patch merged into the kernel to be
able to detect if PRESERVE flag is set or not.

https://patchwork.kernel.org/patch/11354255/

Thanks,
Laurent