From: Guenter Roeck <linux@roeck-us.net>
To: Paul Mackerras <paulus@ozlabs.org>
Cc: linuxppc-dev@ozlabs.org, Daniel Axtens <dja@axtens.net>
Subject: Re: [PATCH v2 3/6] powerpc: Book3S 64-bit outline-only KASAN support
Date: Thu, 2 Jun 2022 08:18:19 -0700 [thread overview]
Message-ID: <20220602151819.GA1057366@roeck-us.net> (raw)
In-Reply-To: <YoTE69OQwiG7z+Gu@cleo>
Hi,
On Wed, May 18, 2022 at 08:05:31PM +1000, Paul Mackerras wrote:
> From: Daniel Axtens <dja@axtens.net>
>
> Implement a limited form of KASAN for Book3S 64-bit machines running under
> the Radix MMU, supporting only outline mode.
>
> - Enable the compiler instrumentation to check addresses and maintain the
> shadow region. (This is the guts of KASAN which we can easily reuse.)
>
> - Require kasan-vmalloc support to handle modules and anything else in
> vmalloc space.
>
> - KASAN needs to be able to validate all pointer accesses, but we can't
> instrument all kernel addresses - only linear map and vmalloc. On boot,
> set up a single page of read-only shadow that marks all iomap and
> vmemmap accesses as valid.
>
> - Document KASAN in powerpc docs.
>
With this patch applied, powerpc:allmodconfig builds fail as follows.
Building powerpc:allmodconfig ... failed
--------------
Error log:
Error: External symbol 'memset' referenced from prom_init.c
make[3]: [arch/powerpc/kernel/Makefile:202: arch/powerpc/kernel/prom_init_check] Error 1 (ignored)
powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o uses soft float
powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o
powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o uses soft float
powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o
powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o uses soft float
powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o
make[5]: [scripts/Makefile.build:435: drivers/gpu/drm/amd/amdgpu/amdgpu.o] Error 1 (ignored)
make[2]: *** No rule to make target 'drivers/gpu/drm/amd/amdgpu/amdgpu.o', needed by 'modules-only.symvers'. Stop.
make[1]: [Makefile:1753: modules] Error 2 (ignored)
This is with gcc 11.3 and binutils 2.38. I also tried with gcc 11.2 and
binutils 2.36.1, with the same results.
Reverting this patch fixes the problem.
Guenter
next prev parent reply other threads:[~2022-06-02 15:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 10:03 [PATCH v2 0/6] KASAN support for 64-bit Book 3S powerpc Paul Mackerras
2022-05-18 10:04 ` [PATCH v2 1/6] kasan: Document support on 32-bit powerpc Paul Mackerras
2022-05-18 10:04 ` [PATCH v2 2/6] powerpc/mm/kasan: rename kasan_init_32.c to init_32.c Paul Mackerras
2022-05-18 10:05 ` [PATCH v2 3/6] powerpc: Book3S 64-bit outline-only KASAN support Paul Mackerras
2022-06-02 15:18 ` Guenter Roeck [this message]
2022-05-18 10:06 ` [PATCH v2 4/6] powerpc/kasan: Don't instrument non-maskable or raw interrupts Paul Mackerras
2022-05-18 10:07 ` [PATCH v2 5/6] powerpc/kasan: Disable address sanitization in kexec paths Paul Mackerras
2022-05-18 10:07 ` [PATCH v2 6/6] Documentation/kasan: Update details of KASAN on powerpc Paul Mackerras
2022-11-14 12:49 ` Christophe Leroy
2022-05-18 13:29 ` [PATCH v2 0/6] KASAN support for 64-bit Book 3S powerpc Christophe Leroy
2022-05-24 11:09 ` Michael Ellerman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220602151819.GA1057366@roeck-us.net \
--to=linux@roeck-us.net \
--cc=dja@axtens.net \
--cc=linuxppc-dev@ozlabs.org \
--cc=paulus@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).