linux-kernel - Re: mmotm 2019-08-27-20-39 uploaded (objtool: xen)

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Message-ID: <57d6ab2e-1bae-dca3-2544-4f6e6a936c3a@infradead.org>
Date:   Wed, 28 Aug 2019 10:56:25 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     akpm@...ux-foundation.org, broonie@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-next@...r.kernel.org, mhocko@...e.cz,
        mm-commits@...r.kernel.org, sfr@...b.auug.org.au,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: mmotm 2019-08-27-20-39 uploaded (objtool: xen)

On 8/28/19 10:19 AM, Josh Poimboeuf wrote:
> On Wed, Aug 28, 2019 at 09:58:37AM -0700, Randy Dunlap wrote:
>> On 8/27/19 8:40 PM, akpm@...ux-foundation.org wrote:
>>> The mm-of-the-moment snapshot 2019-08-27-20-39 has been uploaded to
>>>
>>>    http://www.ozlabs.org/~akpm/mmotm/
>>>
>>> mmotm-readme.txt says
>>>
>>> README for mm-of-the-moment:
>>>
>>> http://www.ozlabs.org/~akpm/mmotm/
>>>
>>> This is a snapshot of my -mm patch queue.  Uploaded at random hopefully
>>> more than once a week.
>>>
>>> You will need quilt to apply these patches to the latest Linus release (5.x
>>> or 5.x-rcY).  The series file is in broken-out.tar.gz and is duplicated in
>>> http://ozlabs.org/~akpm/mmotm/series
>>>
>>> The file broken-out.tar.gz contains two datestamp files: .DATE and
>>> .DATE-yyyy-mm-dd-hh-mm-ss.  Both contain the string yyyy-mm-dd-hh-mm-ss,
>>> followed by the base kernel version against which this patch series is to
>>> be applied.
>>
>>
>>
>> drivers/xen/gntdev.o: warning: objtool: gntdev_copy()+0x229: call to __ubsan_handle_out_of_bounds() with UACCESS enabled
> 
> Easy one :-)
> 
> diff --git a/tools/objtool/check.c b/tools/objtool/check.c
> index 0c8e17f946cd..6a935ab93149 100644
> --- a/tools/objtool/check.c
> +++ b/tools/objtool/check.c
> @@ -483,6 +483,7 @@ static const char *uaccess_safe_builtin[] = {
>  	"ubsan_type_mismatch_common",
>  	"__ubsan_handle_type_mismatch",
>  	"__ubsan_handle_type_mismatch_v1",
> +	"__ubsan_handle_out_of_bounds",
>  	/* misc */
>  	"csum_partial_copy_generic",
>  	"__memcpy_mcsafe",
> 


then I get this one:

lib/ubsan.o: warning: objtool: __ubsan_handle_out_of_bounds()+0x5d: call to ubsan_prologue() with UACCESS enabled


-- 
~Randy