Buildresult: powerpc-next/mmu_defconfig/microblaze-gcc5 built on Mar 1 2019, 02:30

kisskb

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Status:	OK
Date/Time:	Mar 1 2019, 02:30
Duration:	0:00:41.495099
Builder:	ka1
Revision:	powerpc/64s: Implement KUAP for Radix MMU (`d02d2129641d6cd22492ddc85e11d112eb0d5a6f)`
Target:	powerpc-next/mmu_defconfig/microblaze-gcc5
Branch:	powerpc-next
Compiler:	microblaze-gcc5 (microblazeel-linux-gcc.br_real (Buildroot 2016.11-git-00613-ge98b4dd) 5.4.0 / GNU ld (GNU Binutils) 2.26.1)
Config:	mmu_defconfig (download)
Log:	Download original Possible warnings (1) drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] Full Log # git rev-parse -q --verify d02d2129641d6cd22492ddc85e11d112eb0d5a6f^{commit} d02d2129641d6cd22492ddc85e11d112eb0d5a6f already have revision, skipping fetch # git checkout -q -f -B kisskb d02d2129641d6cd22492ddc85e11d112eb0d5a6f # git clean -qxdf # < git log -1 # commit d02d2129641d6cd22492ddc85e11d112eb0d5a6f # Author: Russell Currey <ruscur@russell.cc> # Date: Fri Mar 1 01:49:17 2019 +1100 # # powerpc/64s: Implement KUAP for Radix MMU # # Kernel Userspace Access Prevention utilises a feature of the Radix MMU # which disallows read and write access to userspace addresses. By # utilising this, the kernel is prevented from accessing user data from # outside of trusted paths that perform proper safety checks, such as # copy_{to/from}_user() and friends. # # Userspace access is disabled from early boot and is only enabled when # performing an operation like copy_{to/from}_user(). The register that # controls this (AMR) does not prevent userspace from accessing itself, # so there is no need to save and restore when entering and exiting # userspace. # # This feature has a slight performance impact which I roughly measured # to be 3% slower in the worst case (performing 1GB of 1 byte # read()/write() syscalls), and is gated behind the CONFIG_PPC_KUAP # option for performance-critical builds. # # This feature can be tested by using the lkdtm driver (CONFIG_LKDTM=y) # and performing the following: # # # (echo ACCESS_USERSPACE) > [debugfs]/provoke-crash/DIRECT # # If enabled, this should send SIGSEGV to the thread. # # mpe: Drop the unused paca flags. Zero the UAMOR to be safe. Save the # AMR when we enter the kernel from the kernel and then lock it again. # Restore on the way back to the kernel. This means we handle nesting of # interrupts properly, ie. we are protected inside the page fault # handler caused by a user access. Add paranoid checking of AMR in # switch and syscall return. Add an isync() to prevent_user_access() # # Signed-off-by: Russell Currey <ruscur@russell.cc> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-gcc --version # < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-ld --version # < git log --format=%s --max-count=1 d02d2129641d6cd22492ddc85e11d112eb0d5a6f # < make -s -j 48 ARCH=microblaze O=/kisskb/build/powerpc-next_mmu_defconfig_microblaze CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux- mmu_defconfig # make -s -j 48 ARCH=microblaze O=/kisskb/build/powerpc-next_mmu_defconfig_microblaze CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux- /kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery': /kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ret == -EOPNOTSUPP) ^ Kernel: arch/microblaze/boot/linux.bin is ready (#1) Completed OK # rm -rf /kisskb/build/powerpc-next_mmu_defconfig_microblaze # Build took: 0:00:41.495099

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