Buildresult: powerpc-next/ppc40x_defconfig/powerpc-gcc5 built on Feb 14 2019, 20:22

kisskb

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Status:	OK
Date/Time:	Feb 14 2019, 20:22
Duration:	0:00:41.925684
Builder:	ka1
Revision:	powerpc/ptrace: Simplify vr_get/set() to avoid GCC warning (`bc13f05ffaf016d42536571c2e9173f85cefd47a)`
Target:	powerpc-next/ppc40x_defconfig/powerpc-gcc5
Branch:	powerpc-next
Compiler:	powerpc-gcc5 (powerpc64-linux-gcc (GCC) 5.5.0 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	ppc40x_defconfig (download)
Log:	Download original Possible warnings (1) arch/powerpc/kernel/head_40x.S:883: Warning: invalid register expression Full Log # git rev-parse -q --verify bc13f05ffaf016d42536571c2e9173f85cefd47a^{commit} bc13f05ffaf016d42536571c2e9173f85cefd47a already have revision, skipping fetch # git checkout -q -f -B kisskb bc13f05ffaf016d42536571c2e9173f85cefd47a # git clean -qxdf # < git log -1 # commit bc13f05ffaf016d42536571c2e9173f85cefd47a # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Thu Feb 14 11:08:29 2019 +1100 # # powerpc/ptrace: Simplify vr_get/set() to avoid GCC warning # # GCC 8 warns about the logic in vr_get/set(), which with -Werror breaks # the build: # # In function ‘user_regset_copyin’, # inlined from ‘vr_set’ at arch/powerpc/kernel/ptrace.c:628:9: # include/linux/regset.h:295:4: error: ‘memcpy’ offset [-527, -529] is # out of the bounds [0, 16] of object ‘vrsave’ with type ‘union # <anonymous>’ [-Werror=array-bounds] # arch/powerpc/kernel/ptrace.c: In function ‘vr_set’: # arch/powerpc/kernel/ptrace.c:623:5: note: ‘vrsave’ declared here # } vrsave; # # This has been identified as a regression in GCC, see GCC bug 88273. # # However we can avoid the warning and also simplify the logic and make # it more robust. # # Currently we pass -1 as end_pos to user_regset_copyout(). This says # "copy up to the end of the regset". # # The definition of the regset is: # [REGSET_VMX] = { # .core_note_type = NT_PPC_VMX, .n = 34, # .size = sizeof(vector128), .align = sizeof(vector128), # .active = vr_active, .get = vr_get, .set = vr_set # }, # # The end is calculated as (n * size), ie. 34 * sizeof(vector128). # # In vr_get/set() we pass start_pos as 33 * sizeof(vector128), meaning # we can copy up to sizeof(vector128) into/out-of vrsave. # # The on-stack vrsave is defined as: # union { # elf_vrreg_t reg; # u32 word; # } vrsave; # # And elf_vrreg_t is: # typedef __vector128 elf_vrreg_t; # # So there is no bug, but we rely on all those sizes lining up, # otherwise we would have a kernel stack exposure/overwrite on our # hands. # # Rather than relying on that we can pass an explict end_pos based on # the sizeof(vrsave). The result should be exactly the same but it's # more obviously not over-reading/writing the stack and it avoids the # compiler warning. # # Reported-by: Meelis Roos <mroos@linux.ee> # Reported-by: Mathieu Malaterre <malat@debian.org> # Cc: stable@vger.kernel.org # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 bc13f05ffaf016d42536571c2e9173f85cefd47a # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc40x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc40x_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc40x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- /kisskb/src/arch/powerpc/kernel/head_40x.S: Assembler messages: /kisskb/src/arch/powerpc/kernel/head_40x.S:883: Warning: invalid register expression INFO: Uncompressed kernel (size 0x53f708) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x53f708) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x52f028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x53f708) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x53f708) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-5.0.0-rc2-gbc13f05ffaf0 Created: Thu Feb 14 20:22:54 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2661586 Bytes = 2599.21 KiB = 2.54 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.0.0-rc2-gbc13f05ffaf0 Created: Thu Feb 14 20:22:54 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2693150 Bytes = 2630.03 KiB = 2.57 MiB Load Address: 00600000 Entry Point: 006017dc Image Name: Linux-5.0.0-rc2-gbc13f05ffaf0 Created: Thu Feb 14 20:22:54 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2691486 Bytes = 2628.40 KiB = 2.57 MiB Load Address: 00600000 Entry Point: 00601a18 Completed OK # rm -rf /kisskb/build/powerpc-next_ppc40x_defconfig_powerpc-gcc5 # Build took: 0:00:41.925684

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