Messages in this thread | | | From | Leonardo Bras <> | Subject | [PATCH v2 0/4] Replace current->mm by kvm->mm on powerpc/kvm | Date | Thu, 7 Nov 2019 14:02:54 -0300 |
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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.
Also, I fixed a possible 'use after free' of kvm variable in kvm_vm_ioctl_create_spapr_tce, where it does a mutex_unlock(&kvm->lock) after a kvm_put_kvm(kvm).
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
Build test: - https://travis-ci.org/LeoBras/linux-ppc/builds/608807573
Leonardo Bras (4): powerpc/kvm/book3s: Fixes possible 'use after release' of kvm powerpc/kvm/book3s: Replace current->mm by kvm->mm powerpc/kvm/book3e: Replace current->mm by kvm->mm powerpc/kvm/e500: Replace current->mm by kvm->mm
arch/powerpc/kvm/book3s_64_mmu_hv.c | 10 +++++----- arch/powerpc/kvm/book3s_64_vio.c | 13 +++++++------ arch/powerpc/kvm/book3s_hv.c | 10 +++++----- arch/powerpc/kvm/booke.c | 2 +- arch/powerpc/kvm/e500_mmu_host.c | 6 +++--- 5 files changed, 21 insertions(+), 20 deletions(-)
-- 2.23.0
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