[PATCH v3 0/2] Replace current->mm by kvm->mm on powerpc/kvm

Leonardo Bras
2019-11-26T22:36:29Z

Replace current->mm by kvm->mm on powerpc/kvm

By replacing, we would reduce the use of 'global' current on code,
relying more in the contents of kvm struct.

On code, I found that in kvm_create_vm() there is:
kvm->mm = current->mm;

And that on every kvm_*_ioctl we have tests like that:
if (kvm->mm != current->mm)
return -EIO;

So this change would be safe.

---
Changes since v2:
- Rebased on torvalds/master and updated the remaining patches.

Changes since v1:
- Fixes possible 'use after free' on kvm_spapr_tce_release (from v1)
- Fixes possible 'use after free' on kvm_vm_ioctl_create_spapr_tce
- Fixes undeclared variable error

Leonardo Bras (2):
powerpc/kvm/book3s: Replace current->mm by kvm->mm
powerpc/kvm/book3e: Replace current->mm by kvm->mm

arch/powerpc/kvm/book3s_64_mmu_hv.c | 4 ++--
arch/powerpc/kvm/book3s_64_vio.c | 10 ++++++----
arch/powerpc/kvm/book3s_hv.c | 10 +++++-----
arch/powerpc/kvm/booke.c | 2 +-
4 files changed, 14 insertions(+), 12 deletions(-)

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2.23.0