Buildresult: powerpc-fixes/ppc64_defconfig+UP/powerpc-gcc4.6 built on Jul 17 2018, 02:10

kisskb

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Status:	OK
Date/Time:	Jul 17 2018, 02:10
Duration:	0:02:38.580803
Builder:	ka2
Revision:	KVM: PPC: Check if IOMMU page is contained in the pinned physical page (`7685cf1a7140d1cd184e43c747012fa14cb3dd14)`
Target:	powerpc-fixes/ppc64_defconfig+UP/powerpc-gcc4.6
Branch:	powerpc-fixes
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3)
Config:	ppc64_defconfig+UP (download)
Log:	Download original Possible warnings (13) kernel/cgroup/cgroup-v1.c:1256:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:2497:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:1819:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] net/bridge/br_netlink.c:637:7: warning: 'err' may be used uninitialized in this function [-Wuninitialized] mm/swap_state.c:135:5: warning: 'error' may be used uninitialized in this function [-Wuninitialized] mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] fs/nfsd/nfs4xdr.c:2046:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized] fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized] drivers/net/tun.c:1835:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized] drivers/net/tun.c:1745:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized] drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 7685cf1a7140d1cd184e43c747012fa14cb3dd14^{commit} 7685cf1a7140d1cd184e43c747012fa14cb3dd14 already have revision, skipping fetch # git checkout -q -f -B kisskb 7685cf1a7140d1cd184e43c747012fa14cb3dd14 # git clean -qxdf # < git log -1 # commit 7685cf1a7140d1cd184e43c747012fa14cb3dd14 # Author: Alexey Kardashevskiy <aik@ozlabs.ru> # Date: Wed Jul 11 21:00:44 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. For the page shift this uses the shift # returned by find_linux_pte() which indicates how the page is mapped to # the current userspace - if the page is huge and this is not a zero, then # it is a leaf pte and the page is mapped within the range. # # Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> # Reviewed-by: Nicholas Piggin <npiggin@gmail.com> # Reviewed-by: David Gibson <david@gibson.dropbear.id.au> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version # < git log --format=%s --max-count=1 7685cf1a7140d1cd184e43c747012fa14cb3dd14 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- ppc64_defconfig # Added to kconfig CONFIG_SMP=n # yes \n \| make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- oldconfig yes: standard output: Broken pipe yes: write error # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_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/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/net/bridge/br_netlink.c: In function 'br_afspec': /kisskb/src/net/bridge/br_netlink.c:637:7: warning: 'err' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/mm/swap_state.c: In function '__add_to_swap_cache': /kisskb/src/mm/swap_state.c:135:5: warning: 'error' may be used uninitialized in this function [-Wuninitialized] /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/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/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/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc': /kisskb/src/fs/nfsd/nfs4xdr.c:2046:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized] /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] /kisskb/src/drivers/net/tun.c: In function 'tun_get_user': /kisskb/src/drivers/net/tun.c:1835:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/net/tun.c:1745:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized] /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 Completed OK # rm -rf /kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc # Build took: 0:02:38.580803

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