Buildresult: powerpc-next/mpc885_ads_defconfig+HUGETLB/powerpc-gcc4.6 built on Mar 17 2020, 02:59

kisskb

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Status:	OK
Date/Time:	Mar 17 2020, 02:59
Duration:	0:00:46.656719
Builder:	blade46
Revision:	powerpc/64: Prevent stack protection in early boot (`99793e64b815ec88daa9955c6347bd541e78543b)`
Target:	powerpc-next/mpc885_ads_defconfig+HUGETLB/powerpc-gcc4.6
Branch:	powerpc-next
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	mpc885_ads_defconfig+HUGETLB (download)
Log:	Download original Possible warnings (5) .config:1765:warning: override: reassigning to symbol HUGETLBFS include/linux/list.h:72:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] mm/hugetlb.c:1426:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] fs/io_uring.c:5824:13: warning: 'err' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 99793e64b815ec88daa9955c6347bd541e78543b^{commit} 99793e64b815ec88daa9955c6347bd541e78543b already have revision, skipping fetch # git checkout -q -f -B kisskb 99793e64b815ec88daa9955c6347bd541e78543b # git clean -qxdf # < git log -1 # commit 99793e64b815ec88daa9955c6347bd541e78543b # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Mon Mar 16 22:32:32 2020 +1100 # # powerpc/64: Prevent stack protection in early boot # # The previous commit reduced the amount of code that is run before we # setup a paca. However there are still a few remaining functions that # run with no paca, or worse, with an arbitrary value in r13 that will # be used as a paca pointer. # # In particular the stack protector canary is stored in the paca, so if # stack protector is activated for any of these functions we will read # the stack canary from wherever r13 points. If r13 happens to point # outside of memory we will get a machine check / checkstop. # # For example if we modify initialise_paca() to trigger stack # protection, and then boot in the mambo simulator with r13 poisoned in # skiboot before calling the kernel: # # DEBUG: 19952232: (19952232): INSTRUCTION: PC=0xC0000000191FC1E8: [0x3C4C006D]: addis r2,r12,0x6D [fetch] # DEBUG: 19952236: (19952236): INSTRUCTION: PC=0xC00000001807EAD8: [0x7D8802A6]: mflr r12 [fetch] # FATAL ERROR: 19952276: (19952276): Check Stop for 0:0: Machine Check with ME bit of MSR off # DEBUG: 19952276: (19952276): INSTRUCTION: PC=0xC0000000191FCA7C: [0xE90D0CF8]: ld r8,0xCF8(r13) [Instruction Failed] # INFO: 19952276: (19952277): Execution stopped: Mambo Error, Machine Check Stop, # systemsim % bt # pc: 0xC0000000191FCA7C initialise_paca+0x54 # lr: 0xC0000000191FC22C early_setup+0x44 # stack:0x00000000198CBED0 0x0 +0x0 # stack:0x00000000198CBF00 0xC0000000191FC22C early_setup+0x44 # stack:0x00000000198CBF90 0x1801C968 +0x1801C968 # # So annotate the relevant functions to ensure stack protection is never # enabled for them. # # Fixes: 06ec27aea9fc ("powerpc/64: add stack protector support") # Cc: stable@vger.kernel.org # v4.20+ # 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 99793e64b815ec88daa9955c6347bd541e78543b # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- mpc885_ads_defconfig # Added to kconfig CONFIG_HUGETLBFS=y # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- help # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- olddefconfig .config:1765:warning: override: reassigning to symbol HUGETLBFS # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:72:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page': /kisskb/src/mm/hugetlb.c:1426:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/io_uring.c: In function '__io_sqe_files_update.isra.81': /kisskb/src/fs/io_uring.c:5824:13: warning: 'err' may be used uninitialized in this function [-Wuninitialized] Image Name: Linux-5.6.0-rc2-g99793e64b815 Created: Tue Mar 17 03:00:42 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 1807630 Bytes = 1765.26 KiB = 1.72 MiB Load Address: 00400000 Entry Point: 004001dc Completed OK # rm -rf /kisskb/build/powerpc-next_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 # Build took: 0:00:46.656719

© Michael Ellerman 2006-2018.