Re: [PATCH 0/5] more hardening fixes for s390

On 7/27/26 7:50 AM, Christian Borntraeger wrote:
> Cornelia, Eric, Matt,
> 
> here are 5 more fixes for hardening QEMU against invalid input. Nothing
> is strictly a security issues as defined in the policy. For example
> https://qemu-project.gitlab.io/qemu/system/security.html says assert /
> abort: If triggering the code path requires kernel privileges (or root
> account access) in the guest, asserts/aborts in QEMU are a self
> inflicted denial of service. These will not be treated as security
> flaws, at most hardening bugs.
> And if anyone can provide invalid boot loader content it can provide
> anything to boot if secure boot is not available.
> We should fix those anyway, probably even for 11.1
> 
> Conny, I did not rebuild the s390-ccw, I assume you will do that?
> 
> Christian Borntraeger (1):
>    hw/char/sclpconsole-lm: avoid guest triggerable assert
> 
> Joshua Daley (4):
>    s390x/ipl: validate num_comp against iplb length before iterating
>    pc-bios/s390-ccw: fix out-of-bounds read in iso_get_file_size()
>    pc-bios/s390-ccw: bounds-check zipl menu entry index before array
>      write

Applied these four for 11.2, with the two typos fixed as Matt mentioned, 
and cc'd qemu-stable.

>    pc-bios/s390-ccw: bound zipl menu strlen and replace VLA in
>      zipl_print_entry

Will wait for a v2 on this one.

Thanks!

> 
>   hw/char/sclpconsole-lm.c    |  3 ++-
>   hw/s390x/ipl.h              |  6 ++++++
>   pc-bios/s390-ccw/bootmap.c  |  6 ++++--
>   pc-bios/s390-ccw/helper.h   | 10 ++++++++++
>   pc-bios/s390-ccw/menu.c     | 36 +++++++++++++++++++++++++++++-------
>   pc-bios/s390-ccw/s390-ccw.h |  2 +-
>   6 files changed, 52 insertions(+), 11 deletions(-)
>