Re: [PATCH v2] 9pfs: local: read native symlinks when security-model=mapped

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Saturday, 22 November 2025 21:19:09 CET Andrey Erokhin wrote:
> Directories attached using virtfs with security-model=mapped
> may contain native symlinks
> 
> This can happen e.g. when booting from a rootfs directory tree
> (usually with a writable overlay set up on the host side)
> 
> Currently, when security-model=mapped[-xattr|-file],
> QEMU assumes that host-side "symlinks" are in the mapped format,
> i.e. are regular files storing the linked path,
> so it tries to open with O_NOFOLLOW
> and fails with ELOOP on native symlinks
> 
> This patch introduces a fallback for such cases:
> reuse security-model=[none|passthrough] else if branch logic
> where readlink will be called for the path basename
> 
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/173
> 
> Signed-off-by: Andrey Erokhin <language.lawyer@gmail.com>
> ---
>  hw/9pfs/9p-local.c | 4 ++++
>  1 file changed, 4 insertions(+)

Queued on 9p.next:
https://github.com/cschoenebeck/qemu/commits/9p.next

Thanks!

/Christian