Buildresult: powerpc-fixes/44x/currituck_defconfig/powerpc-gcc5 built on Jul 5 2018, 00:08
kisskb
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Status:
OK
Date/Time:
Jul 5 2018, 00:08
Duration:
0:00:57.080596
Builder:
ka2
Revision:
KVM: PPC: Check if IOMMU page is contained in the pinned physical page (
d99d49613b7cd196ea161fc708040ea88adb6e18)
Target:
powerpc-fixes/44x/currituck_defconfig/powerpc-gcc5
Branch:
powerpc-fixes
Compiler:
powerpc-gcc5
(powerpc64-linux-gcc (GCC) 5.3.0)
Config:
44x/currituck_defconfig
(
download
)
Log:
Download original
Possible warnings (5)
WARNING: modpost: Found 1 section mismatch(es). arch/powerpc/boot/currituck.dtb: Warning (pci_bridge): /plb/pciex@10100000000: node name is not "pci" or "pcie" arch/powerpc/boot/currituck.dtb: Warning (pci_bridge): /plb/pciex@30100000000: node name is not "pci" or "pcie" arch/powerpc/boot/currituck.dtb: Warning (pci_bridge): /plb/pciex@38100000000: node name is not "pci" or "pcie" arch/powerpc/boot/currituck.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
Full Log
# git rev-parse -q --verify d99d49613b7cd196ea161fc708040ea88adb6e18^{commit} d99d49613b7cd196ea161fc708040ea88adb6e18 already have revision, skipping fetch # git checkout -q -f -B kisskb d99d49613b7cd196ea161fc708040ea88adb6e18 # git clean -qxdf # < git log -1 # commit d99d49613b7cd196ea161fc708040ea88adb6e18 # Author: Alexey Kardashevskiy <aik@ozlabs.ru> # Date: Wed Jul 4 15:00:52 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 only allows huge pages use if the entire # preregistered block is backed with huge pages which are completely # contained the preregistered chunk; otherwise this defaults to PAGE_SIZE. # # Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < git log --format=%s --max-count=1 d99d49613b7cd196ea161fc708040ea88adb6e18 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_currituck_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 44x/currituck_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_currituck_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-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 1 section mismatch(es). To see full details build your kernel with: 'make CONFIG_DEBUG_SECTION_MISMATCH=y' arch/powerpc/boot/currituck.dtb: Warning (pci_bridge): /plb/pciex@10100000000: node name is not "pci" or "pcie" arch/powerpc/boot/currituck.dtb: Warning (pci_bridge): /plb/pciex@30100000000: node name is not "pci" or "pcie" arch/powerpc/boot/currituck.dtb: Warning (pci_bridge): /plb/pciex@38100000000: node name is not "pci" or "pcie" arch/powerpc/boot/currituck.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge' Completed OK # rm -rf /kisskb/build/powerpc-fixes_44x_currituck_defconfig_powerpc-5.3 # Build took: 0:00:57.080596
© Michael Ellerman 2006-2018.