linux-kernel - [PATCH 0/3] Use new wrappers to copy userspace arrays

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Message-ID: <20231102181526.43279-1-pstanner@redhat.com>
Date:   Thu,  2 Nov 2023 19:15:23 +0100
From:   Philipp Stanner <pstanner@...hat.com>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Philipp Stanner <pstanner@...hat.com>
Subject: [PATCH 0/3] Use new wrappers to copy userspace arrays

Hi,

Linus recently merged [1] the wrapper functions memdup_array_user() and
vmemdup_array_user() in include/linux/string.h for Kernel v6.7

I am currently adding them to all places where (v)memdup_user() had been
used to copy arrays.

The wrapper is different to the wrapped functions only in that it might
return -EOVERFLOW. So this new error code might get pushed up to
userspace. I hope this is fine.

I felt that it might be a good idea to land those three patches here
with a single series, since they all touch something KVM-related.

Kind regards,
P.

[1] https://lore.kernel.org/all/169886743808.2396.17544791408117731525.pr-tracker-bot@kernel.org/

Philipp Stanner (3):
  arch/x86/kvm: copy user-array with overflow-check
  arch/s390/kvm: copy userspace-array safely
  virt/kvm: copy userspace-array safely

 arch/s390/kvm/guestdbg.c | 4 ++--
 arch/x86/kvm/cpuid.c     | 4 ++--
 virt/kvm/kvm_main.c      | 5 ++---
 3 files changed, 6 insertions(+), 7 deletions(-)

-- 
2.41.0