Re: [U-Boot] [PATCH v4 0/7] Fix CVE-2018-18440 and CVE-2018-18439
Am 05.12.2018 um 15:20 schrieb Frank Wunderlich:
Hi Simon,
have you any new infos here? last discussion is for v3...
I'm working on it. The bug you get is in lmb.c (and has been there for a long time). It is rather hidden by the way the lmb functions are used when booting, but it shows in my new usage.
I'll post v4 soon, hopefully.
Regards, Simon
regards Frank
Gesendet: Sonntag, 02. Dezember 2018 um 18:44 Uhr Von: "Frank Wunderlich" frank-w@public-files.de An: "Simon Goldschmidt" simon.k.r.goldschmidt@gmail.com Cc: u-boot@lists.denx.de Betreff: Re: [U-Boot] [PATCH v4 0/7] Fix CVE-2018-18440 and CVE-2018-18439
Right, i test on bananapi-r2. 2gb ram with 0x80000000 base-adress
Seems you need (unsigned) int64 for calculations
Am 2. Dezember 2018 18:14:19 MEZ schrieb Simon Goldschmidt simon.k.r.goldschmidt@gmail.com:
Am 02.12.2018 um 16:48 schrieb Frank Wunderlich:
lmb_init: base: 0x80000000, size: 0x80000000
Ok, so I don't know your board, is that correct? Do you have 2 GByte starting at 0x80000000?
If so, that would result in an overflow to 0 on a 32-bit platform and would explain why it doesn't work.
This is a perfect input for a test case :-)
Thanks, Simon
https://github.com/frank-w/u-boot/commit/e0763252a8e135f00b996fbda7bb1067a19...
Regards Frank
Gesendet: Sonntag, 02. Dezember 2018 um 10:24 Uhr Von: "Simon Goldschmidt" simon.k.r.goldschmidt@gmail.com An: "Frank Wunderlich" frank-w@public-files.de Cc: u-boot@lists.denx.de Betreff: Re: [U-Boot] [PATCH v4 0/7] Fix CVE-2018-18440 and
CVE-2018-18439
Am 01.12.2018 um 12:07 schrieb Frank Wunderlich:
forgot error-message and detailed command:
fatload ${device} ${partition} ${scriptaddr}
${bpi}/${board}/${service}/${bootenv}
** Reading file would overwrite reserved memory ** echo ${device} ${partition} ${scriptaddr}
${bpi}/${board}/${service}/${bootenv}
mmc 1:1 0x83000000 bananapi/bpi-r2/linux/uEnv.txt
file exists i checked with test, but fatload failed, after
reverting the Patches same command works
Hmm, ok. With your configuration, I thought
'gd->bd->bi_dram[0].start'
and 'gd->bd->bi_dram[0].size' should be populated and correctly
describe
your DRAM.
Could you try adding this printf code to the function 'lmb_init_and_reserve':
printf("lmb_init: base: 0x%x, size: 0x%x\n", base, size);
and check if this correctly describes your memory?
Thanks, Simon
regards Frank
> Gesendet: Samstag, 01. Dezember 2018 um 10:46 Uhr > Von: "Frank Wunderlich" frank-w@public-files.de > An: "Simon Goldschmidt" simon.k.r.goldschmidt@gmail.com > Cc: u-boot@lists.denx.de > Betreff: Re: [U-Boot] [PATCH v4 0/7] Fix CVE-2018-18440 and
CVE-2018-18439
> > Hi Simon > > #define CONFIG_SYS_SDRAM_BASE 0x80000000 > >
https://github.com/frank-w/u-boot/blob/a6d0c3f8e992a2e428f05443647fe9f5b13f8...
> > CONFIG_ARM=y > CONFIG_NR_DRAM_BANKS=1 >
https://github.com/frank-w/u-boot/blob/a6d0c3f8e992a2e428f05443647fe9f5b13f8...
> > i applied the patch-series on top of my 2018-11 final (currently
removed from github)
> > https://github.com/frank-w/u-boot/tree/bpi-r2_v5 > > tried ${scriptaddr}=0x83000000 > > here the fatload-command: > >
https://github.com/frank-w/u-boot/blob/60bc4075c7744e36058fcba76cd6e6c3a4002...
> > working before, 0x81000000 and some higher values > > HTH > > regards Frank > >> Gesendet: Samstag, 01. Dezember 2018 um 10:25 Uhr >> Von: "Simon Goldschmidt" simon.k.r.goldschmidt@gmail.com >> An: "Frank Wunderlich" frank-w@public-files.de >> Cc: "U-Boot Mailing List" u-boot@lists.denx.de >> Betreff: Re: [U-Boot] [PATCH v4 0/7] Fix CVE-2018-18440 and
CVE-2018-18439
>> >> On Fri, Nov 30, 2018 at 6:51 PM Frank Wunderlich >> frank-w@public-files.de wrote: >>> >>> Hi Simon, >>> >>> after applying these Patch-series i cannot load to any address
(fatload). Do i need any additional Patch ("fdt: parse "reserved-memory" for memory reservation" sounds like that). Maybe there should be a fallback if no reservation is defined.
>> >> No, you should not need additional patches. The code makes use of >> "lmb" memory allocation just like the "bootm" code does. The
"memory
>> reservation" patch you cited only ensures that memory which is
marked
>> as reserved in the fdt cannot be overwritten by load. >> >> If it doesn't work for you at all, the available memory is
probably
>> not described correctly. Could you check the values of the
following
>> defines (or if they are defined at all): >> - CONFIG_SYS_SDRAM_BASE >> - CONFIG_ARM >> - CONFIG_NR_DRAM_BANKS >> >> I might need to improve the DRAM detection code in v5 (which is
still
>> pending as I am working on lmb tests). >> >> Regards, >> Simon >> >>> >>> regards Frank >>> >>>> Gesendet: Samstag, 24. November 2018 um 15:11 Uhr >>>> Von: "Simon Goldschmidt" simon.k.r.goldschmidt@gmail.com >>>> An: "Tom Rini" trini@konsulko.com, u-boot@lists.denx.de, "Joe
Hershberger" joe.hershberger@ni.com
>>>> Cc: "Alexey Brodkin" Alexey.Brodkin@synopsys.com, "Heinrich
Schuchardt" xypron.glpk@gmx.de, "Michal Simek" michal.simek@xilinx.com, "Alexander Graf" agraf@suse.de, "Andrea Barisani" andrea.barisani@f-secure.com
>>>> Betreff: [U-Boot] [PATCH v4 0/7] Fix CVE-2018-18440 and
CVE-2018-18439
>>>> >>>> This series fixes CVE-2018-18440 ("insufficient boundary checks
in
>>>> filesystem image load") by adding restrictions to the 'load' >>>> command and fixes CVE-2018-18439 ("insufficient boundary checks
in
>>>> network image boot") by adding restrictions to the tftp code. >>>> The functions from lmb.c are used to setup regions of allowed
and
>>>> reserved memory. Then, the file size to load is checked against
these
>>>> addresses and loading the file is aborted if it would overwrite >>>> reserved memory. >>>> >>>> The memory reservation code is reused from bootm/image. >>>> >>>> Changes in v4: >>>> - fixed invalid 'if' statement without braces in
boot_fdt_reserve_region
>>>> - removed patch 7 ("net: remove CONFIG_MCAST_TFTP), adapted
patch 8
>>>> >>>> Changes in v3: >>>> - No patch changes, but needed to resend since patman added too
many cc
>>>> addresses that gmail seemed to detect as spam :-( >>>> >>>> Changes in v2: >>>> - added code to reserve devicetree reserved-memory in lmb >>>> - added tftp fixes (patches 7 and 8) >>>> - fixed a bug in new function lmb_alloc_addr >>>> >>>> Simon Goldschmidt (7): >>>> lib: lmb: reserving overlapping regions should fail >>>> fdt: parse "reserved-memory" for memory reservation >>>> lib: lmb: extend lmb for checks at load time >>>> fs: prevent overwriting reserved memory >>>> bootm: use new common function lmb_init_and_reserve >>>> lmb: remove unused extern declaration >>>> tftp: prevent overwriting reserved memory >>>> >>>> common/bootm.c | 8 ++---- >>>> common/image-fdt.c | 53 +++++++++++++++++++++++++++++------ >>>> fs/fs.c | 56
+++++++++++++++++++++++++++++++++++--
>>>> include/lmb.h | 7 +++-- >>>> lib/lmb.c | 69
++++++++++++++++++++++++++++++++++++++++++++++
>>>> net/tftp.c | 66
++++++++++++++++++++++++++++++++++++++------
>>>> 6 files changed, 231 insertions(+), 28 deletions(-) >>>> >>>> -- >>>> 2.17.1 >>>> >>>> _______________________________________________ >>>> U-Boot mailing list >>>> U-Boot@lists.denx.de >>>> https://lists.denx.de/listinfo/u-boot >>>> >> > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > https://lists.denx.de/listinfo/u-boot >
participants (1)
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Simon Goldschmidt