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Message-ID: <87imizww4i.fsf@dja-thinkpad.axtens.net>
Date: Fri, 20 Mar 2020 14:19:57 +1100
From: Daniel Axtens <dja@...ens.net>
To: Jason Yan <yanaijie@...wei.com>, mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org, diana.craciun@....com, christophe.leroy@....fr, benh@...nel.crashing.org, paulus@...ba.org, npiggin@...il.com, keescook@...omium.org, kernel-hardening@...ts.openwall.com, oss@...error.net
Cc: linux-kernel@...r.kernel.org, zhaohongjiang@...wei.com, Jason Yan <yanaijie@...wei.com>
Subject: Re: [PATCH v4 0/6] implement KASLR for powerpc/fsl_booke/64
Hi Jason,
I tried to compile this series and got the following error:
/home/dja/dev/linux/linux/arch/powerpc/mm/nohash/kaslr_booke.c: In function ‘kaslr_early_init’:
/home/dja/dev/linux/linux/arch/powerpc/mm/nohash/kaslr_booke.c:357:33: error: ‘linear_sz’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
357 | regions.pa_end = memstart_addr + linear_sz;
| ~~~~~~~~~~~~~~^~~~~~~~~~~
/home/dja/dev/linux/linux/arch/powerpc/mm/nohash/kaslr_booke.c:317:21: note: ‘linear_sz’ was declared here
317 | unsigned long ram, linear_sz;
| ^~~~~~~~~
/home/dja/dev/linux/linux/arch/powerpc/mm/nohash/kaslr_booke.c:187:8: error: ‘ram’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
187 | ret = parse_crashkernel(boot_command_line, size, &crash_size,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
188 | &crash_base);
| ~~~~~~~~~~~~
/home/dja/dev/linux/linux/arch/powerpc/mm/nohash/kaslr_booke.c:317:16: note: ‘ram’ was declared here
317 | unsigned long ram, linear_sz;
| ^~~
cc1: all warnings being treated as errors
make[4]: *** [/home/dja/dev/linux/linux/scripts/Makefile.build:268: arch/powerpc/mm/nohash/kaslr_booke.o] Error 1
make[3]: *** [/home/dja/dev/linux/linux/scripts/Makefile.build:505: arch/powerpc/mm/nohash] Error 2
make[2]: *** [/home/dja/dev/linux/linux/scripts/Makefile.build:505: arch/powerpc/mm] Error 2
make[2]: *** Waiting for unfinished jobs....
I have attached my .config file.
I'm using
powerpc64-linux-gnu-gcc (Ubuntu 9.2.1-9ubuntu1) 9.2.1 20191008
Regards,
Daniel
Download attachment ".config" of type "application/octet-stream" (93922 bytes)
> This is a try to implement KASLR for Freescale BookE64 which is based on
> my earlier implementation for Freescale BookE32:
> https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=131718&state=*
>
> The implementation for Freescale BookE64 is similar as BookE32. One
> difference is that Freescale BookE64 set up a TLB mapping of 1G during
> booting. Another difference is that ppc64 needs the kernel to be
> 64K-aligned. So we can randomize the kernel in this 1G mapping and make
> it 64K-aligned. This can save some code to creat another TLB map at
> early boot. The disadvantage is that we only have about 1G/64K = 16384
> slots to put the kernel in.
>
> KERNELBASE
>
> 64K |--> kernel <--|
> | | |
> +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+
> | | | |....| | | | | | | | | |....| | |
> +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+
> | | 1G
> |-----> offset <-----|
>
> kernstart_virt_addr
>
> I'm not sure if the slot numbers is enough or the design has any
> defects. If you have some better ideas, I would be happy to hear that.
>
> Thank you all.
>
> v3->v4:
> Do not define __kaslr_offset as a fixed symbol. Reference __run_at_load and
> __kaslr_offset by symbol instead of magic offsets.
> Use IS_ENABLED(CONFIG_PPC32) instead of #ifdef CONFIG_PPC32.
> Change kaslr-booke32 to kaslr-booke in index.rst
> Switch some instructions to 64-bit.
> v2->v3:
> Fix build error when KASLR is disabled.
> v1->v2:
> Add __kaslr_offset for the secondary cpu boot up.
>
> Jason Yan (6):
> powerpc/fsl_booke/kaslr: refactor kaslr_legal_offset() and
> kaslr_early_init()
> powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper
> powerpc/fsl_booke/64: implement KASLR for fsl_booke64
> powerpc/fsl_booke/64: do not clear the BSS for the second pass
> powerpc/fsl_booke/64: clear the original kernel if randomized
> powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst
> and add 64bit part
>
> Documentation/powerpc/index.rst | 2 +-
> .../{kaslr-booke32.rst => kaslr-booke.rst} | 35 +++++++-
> arch/powerpc/Kconfig | 2 +-
> arch/powerpc/kernel/exceptions-64e.S | 23 +++++
> arch/powerpc/kernel/head_64.S | 13 +++
> arch/powerpc/kernel/setup_64.c | 3 +
> arch/powerpc/mm/mmu_decl.h | 23 ++---
> arch/powerpc/mm/nohash/kaslr_booke.c | 88 +++++++++++++------
> 8 files changed, 144 insertions(+), 45 deletions(-)
> rename Documentation/powerpc/{kaslr-booke32.rst => kaslr-booke.rst} (59%)
>
> --
> 2.17.2
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