QEMU user mode execve

QEMU user mode execve

[Mauricio Galindo]

[-- Attachment #1: Type: text/plain, Size: 326 bytes --]

Hi,

I'm running QEMU in user mode and I'm running into issues when trying to
exec binaries within the emulated process given that binaries are
expected to run in the native architecture. Would it be useful to have an
option to rewrite execve(/bin/some_binary, ...) to
execve(qemu-$arch-static, [/bin/some_binary, ...], ...)?

[-- Attachment #2: Type: text/html, Size: 381 bytes --]

QEMU user mode execve

[Mauricio Galindo]

Hi,

I'm running QEMU in user mode and I'm running into issues when trying
to exec binaries within the emulated process given that binaries are
expected to run in the native architecture. Would it be useful to have
an option to rewrite execve(/bin/some_binary, ...) to
execve(qemu-$arch-static, [/bin/some_binary, ...], ...)?

Re: QEMU user mode execve

[Michal Suchánek]

On Thu, Oct 03, 2019 at 10:48:46AM -0700, Mauricio Galindo wrote:
> Hi,
> 
> I'm running QEMU in user mode and I'm running into issues when trying
> to exec binaries within the emulated process given that binaries are
> expected to run in the native architecture. Would it be useful to have
> an option to rewrite execve(/bin/some_binary, ...) to
> execve(qemu-$arch-static, [/bin/some_binary, ...], ...)?
> 

This is handled in kernel by binfmt-misc.

Debian has nice packaging for the required configuration. They use it to
create non-native installation images.

HTH

Michal

Re: QEMU user mode execve

[Warner Losh]

[-- Attachment #1: Type: text/plain, Size: 1021 bytes --]

On Thu, Oct 3, 2019 at 1:36 PM Michal Suchánek <msuchanek@suse.de> wrote:

> On Thu, Oct 03, 2019 at 10:48:46AM -0700, Mauricio Galindo wrote:
> > Hi,
> >
> > I'm running QEMU in user mode and I'm running into issues when trying
> > to exec binaries within the emulated process given that binaries are
> > expected to run in the native architecture. Would it be useful to have
> > an option to rewrite execve(/bin/some_binary, ...) to
> > execve(qemu-$arch-static, [/bin/some_binary, ...], ...)?
> >
>
> This is handled in kernel by binfmt-misc.
>
> Debian has nice packaging for the required configuration. They use it to
> create non-native installation images.
>

FreeBSD also uses bsd-user (admittedly a much changed one from what's
upstream[*]) to build non-native packages. It uses the same binfmt stuff in
a chroot.

Warner

[*] I've rebased our work forward up through 3.1 release and hope to have
it rebased through the top of the tree shortly and have it ready for
upstreaming soon.

[-- Attachment #2: Type: text/html, Size: 1452 bytes --]