Buildresult: powerpc-next/85xx/socrates_defconfig/powerpc-gcc4.6 built on Feb 14 2019, 19:56

kisskb

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Status:	OK
Date/Time:	Feb 14 2019, 19:56
Duration:	0:00:34.337215
Builder:	ka1
Revision:	powerpc/ptrace: Simplify vr_get/set() to avoid GCC warning (`bc13f05ffaf016d42536571c2e9173f85cefd47a)`
Target:	powerpc-next/85xx/socrates_defconfig/powerpc-gcc4.6
Branch:	powerpc-next
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	85xx/socrates_defconfig (download)
Log:	Download original Possible warnings (6) kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] 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/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version # < git log --format=%s --max-count=1 bc13f05ffaf016d42536571c2e9173f85cefd47a # < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_socrates_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- 85xx/socrates_defconfig # make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_socrates_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2594:6: 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:1855:6: warning: 'ret' 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/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 [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:227:19: note: 'i' was declared here INFO: Uncompressed kernel (size 0x5957ac) 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 19:56:48 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2833117 Bytes = 2766.72 KiB = 2.70 MiB Load Address: 00000000 Entry Point: 00000000 Completed OK # rm -rf /kisskb/build/powerpc-next_85xx_socrates_defconfig_powerpc-gcc4.6 # Build took: 0:00:34.337215

© Michael Ellerman 2006-2018.