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

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Date:   Wed, 28 Aug 2019 12:19:23 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
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 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",