Running qemu-emulated binaries passes wrong arguments.

[mook-as]

Versions involved:

• Lima v0.11.3
• Alpine-lima v0.2.20 (alpine-lima-std-3.16.0-x86_64.iso)
• Host: x86_64 macOS Catalina 10.15.7

Steps to reproduce:

• Start the alpine example lima configuration from lima.
• The rest of the steps occur in the VM.
• Download https://dl-cdn.alpinelinux.org/alpine/v3.16/main/aarch64/musl-1.2.3-r0.apk (it's a tar.gz file) and extract lib/ld-musl-aarch64.so.1 (to /lib/ld-musl-aarch64.so.1).
• Download https://dl-cdn.alpinelinux.org/alpine/v3.16/main/aarch64/busybox-1.35.0-r17.apk and extract bin/busybox somewhere.
• Create a symbolic link called uname pointing to the freshly-extracted bin/busybox
• Run ./uname -a

Expected results:

Linux lima-alpine 5.15.57-0-virt #1-Alpine SMP Fri, 29 Jul 2022 07:15:20 +0000 aarch64 Linux

Actual results:

a: applet not found

Additional Information

I believe https://github.com/tonistiigi/binfmt/commit/c5e21394c9378124b17cdf9c4a1c09b119cfba17 added a patch to the qemu in use to assume the preserve-argv flag in binfmt_misc when no flags are found; I assume that code is somehow being triggered.

Workaround (and likely fix): Add binfmt_flags="POCF" to /etc/conf.d/qemu-binfmt.

References: https://github.com/rancher-sandbox/rancher-desktop/issues/2668 / https://github.com/rancher-sandbox/rancher-desktop/issues/2659