Buildresult: powerpc-fixes/pseries_le_defconfig/powerpc-gcc5 built on Jul 6 2018, 10:38

kisskb

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Status:	OK
Date/Time:	Jul 6 2018, 10:38
Duration:	0:03:05.367200
Builder:	ka4
Revision:	KVM: PPC: Check if IOMMU page is contained in the pinned physical page (`9e049ef80be988e91cb55f3ddfa7c80a7b376852)`
Target:	powerpc-fixes/pseries_le_defconfig/powerpc-gcc5
Branch:	powerpc-fixes
Compiler:	powerpc-gcc5 (powerpc64le-linux-gcc (GCC) 5.2.0)
Config:	pseries_le_defconfig (download)
Log:	Download original Possible warnings (1) WARNING: modpost: Found 3 section mismatch(es). Full Log # git rev-parse -q --verify 9e049ef80be988e91cb55f3ddfa7c80a7b376852^{commit} 9e049ef80be988e91cb55f3ddfa7c80a7b376852 already have revision, skipping fetch # git checkout -q -f -B kisskb 9e049ef80be988e91cb55f3ddfa7c80a7b376852 # git clean -qxdf # < git log -1 # commit 9e049ef80be988e91cb55f3ddfa7c80a7b376852 # Author: Alexey Kardashevskiy <aik@ozlabs.ru> # Date: Thu Jul 5 18:01:33 2018 +1000 # # KVM: PPC: Check if IOMMU page is contained in the pinned physical page # # A VM which has: # - a DMA capable device passed through to it (eg. network card); # - running a malicious kernel that ignores H_PUT_TCE failure; # - capability of using IOMMU pages bigger that physical pages # can create an IOMMU mapping that exposes (for example) 16MB of # the host physical memory to the device when only 64K was allocated to # the VM. # # The remaining 16MB - 64K will be some other content of host memory, # possibly including pages of the VM, but also pages of host kernel memory, # host programs or other VMs. # # The attacking VM does not control the location of the page it can map, # and is only allowed to map as many pages as it has pages of RAM. # # We already have a check in drivers/vfio/vfio_iommu_spapr_tce.c that # an IOMMU page is contained in the physical page so the PCI hardware won't # get access to unassigned host memory; however this check is missing in # the KVM fastpath (H_PUT_TCE accelerated code). We were lucky so far and # did not hit this yet as the very first time when the mapping happens # we do not have tbl::it_userspace allocated yet and fall back to # the userspace which in turn calls VFIO IOMMU driver, this fails and # the guest does not retry, # # This stores the smallest preregistered page size in the preregistered # region descriptor and changes the mm_iommu_xxx API to check this against # the IOMMU page size. This calculates maximum page size as a minimum of # the natural region alignment and compound page size. # # Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-gcc --version # < git log --format=%s --max-count=1 9e049ef80be988e91cb55f3ddfa7c80a7b376852 # < make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux- pseries_le_defconfig # make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux- /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. WARNING: modpost: Found 3 section mismatch(es). To see full details build your kernel with: 'make CONFIG_DEBUG_SECTION_MISMATCH=y' Completed OK # rm -rf /kisskb/build/powerpc-fixes_pseries_le_defconfig_ppc64le # Build took: 0:03:05.367200

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