Date: Wed, 09 Oct 2019 13:46:38 -0500 From: Scott Wood <oss@...error.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 Cc: wangkefeng.wang@...wei.com, linux-kernel@...r.kernel.org, jingxiangfeng@...wei.com, zhaohongjiang@...wei.com, thunder.leizhen@...wei.com, yebin10@...wei.com Subject: Re: [PATCH v7 00/12] implement KASLR for powerpc/fsl_booke/32 On Wed, 2019-10-09 at 16:41 +0800, Jason Yan wrote: > Hi Scott, > > On 2019/10/9 15:13, Scott Wood wrote: > > On Wed, 2019-10-09 at 14:10 +0800, Jason Yan wrote: > > > Hi Scott, > > > > > > Would you please take sometime to test this? > > > > > > Thank you so much. > > > > > > On 2019/9/24 13:52, Jason Yan wrote: > > > > Hi Scott, > > > > > > > > Can you test v7 to see if it works to load a kernel at a non-zero > > > > address? > > > > > > > > Thanks, > > > > Sorry for the delay. Here's the output: > > > > Thanks for the test. > > > ## Booting kernel from Legacy Image at 10000000 ... > > Image Name: Linux-5.4.0-rc2-00050-g8ac2cf5b4 > > Image Type: PowerPC Linux Kernel Image (gzip compressed) > > Data Size: 7521134 Bytes = 7.2 MiB > > Load Address: 04000000 > > Entry Point: 04000000 > > Verifying Checksum ... OK > > ## Flattened Device Tree blob at 1fc00000 > > Booting using the fdt blob at 0x1fc00000 > > Uncompressing Kernel Image ... OK > > Loading Device Tree to 07fe0000, end 07fff65c ... OK > > KASLR: No safe seed for randomizing the kernel base. > > OF: reserved mem: initialized node qman-fqd, compatible id fsl,qman-fqd > > OF: reserved mem: initialized node qman-pfdr, compatible id fsl,qman-pfdr > > OF: reserved mem: initialized node bman-fbpr, compatible id fsl,bman-fbpr > > Memory CAM mapping: 64/64/64 Mb, residual: 12032Mb > > When boot from 04000000, the max CAM value is 64M. And > you have a board with 12G memory, CONFIG_LOWMEM_CAM_NUM=3 means only > 192M memory is mapped and when kernel is randomized at the middle of > this 192M memory, we will not have enough continuous memory for node map. > > Can you set CONFIG_LOWMEM_CAM_NUM=8 and see if it works? OK, that worked. -Scott
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