# 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 # 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 # Signed-off-by: Michael Ellerman # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version # < git log --format=%s --max-count=1 d99d49613b7cd196ea161fc708040ea88adb6e18 # < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_smp_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- mpc85xx_smp_defconfig # make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_smp_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. /kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount': /kisskb/src/kernel/cgroup/cgroup-v1.c:1256:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. /kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2497:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write': /kisskb/src/drivers/base/regmap/regmap.c:1819:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/sound/soc/codecs/wm8960.c: In function 'wm8960_configure_clocking': /kisskb/src/sound/soc/codecs/wm8960.c:803:70: warning: 'j' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/sound/soc/codecs/wm8960.c:800:68: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: In function 'allocate_bd': /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:139:6: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:231:19: note: 'i' was declared here /kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page': /kisskb/src/mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here /kisskb/src/fs/udf/unicode.c: In function 'udf_name_conv_char': /kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized] arch/powerpc/boot/mpc8555cds.dtb: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) arch/powerpc/boot/mpc8541cds.dtb: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbfd44c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) INFO: Uncompressed kernel (size 0xbeccc8) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xc00000) Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818154 Bytes = 5681.79 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818137 Bytes = 5681.77 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00288 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818270 Bytes = 5681.90 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00288 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818191 Bytes = 5681.83 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00288 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5817164 Bytes = 5680.82 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5817887 Bytes = 5681.53 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5817248 Bytes = 5680.91 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5817217 Bytes = 5680.88 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818553 Bytes = 5682.18 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5793276 Bytes = 5657.50 kB = 5.52 MB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818056 Bytes = 5681.70 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00288 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818158 Bytes = 5681.79 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818239 Bytes = 5681.87 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818063 Bytes = 5681.70 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5817884 Bytes = 5681.53 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00248 Image Name: Linux-4.18.0-rc3-gd99d496 Created: Wed Jul 4 23:38:49 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5818192 Bytes = 5681.83 kB = 5.55 MB Load Address: 00c00000 Entry Point: 00c00288 Completed OK # rm -rf /kisskb/build/powerpc-fixes_mpc85xx_smp_defconfig_powerpc # Build took: 0:00:45.075688