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Date: Thu, 26 Mar 2020 06:47:01 -0700 From: Matt Helsley <mhelsley@...are.com> To: Nick Desaulniers <ndesaulniers@...gle.com> CC: <jpoimboe@...hat.com>, <peterz@...radead.org>, Mauro Carvalho Chehab <mchehab+samsung@...nel.org>, Jonathan Corbet <corbet@....net>, Wolfram Sang <wsa@...-dreams.de>, Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>, "Raphael Gault" <raphael.gault@....com>, <linux-kernel@...r.kernel.org>, <clang-built-linux@...glegroups.com> Subject: Re: [PATCH] objtool: Documentation: document UACCESS warnings On Mon, Mar 23, 2020 at 05:13:20PM -0700, Nick Desaulniers wrote: > Compiling with Clang and CONFIG_KASAN=y was exposing a few warnings: > call to memset() with UACCESS enabled > > Document how to fix these for future travelers. > > Link: https://github.com/ClangBuiltLinux/linux/issues/876 > Suggested-by: Peter Zijlstra <peterz@...radead.org> > Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com> > --- > .../Documentation/stack-validation.txt | 20 +++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/tools/objtool/Documentation/stack-validation.txt b/tools/objtool/Documentation/stack-validation.txt > index de094670050b..156fee13ba02 100644 > --- a/tools/objtool/Documentation/stack-validation.txt > +++ b/tools/objtool/Documentation/stack-validation.txt > @@ -289,6 +289,26 @@ they mean, and suggestions for how to fix them. > might be corrupt due to a gcc bug. For more details, see: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70646 > > +9. file.o: warning: objtool: funcA() call to funcB() with UACCESS enabled > + > + This means that an unexpected call to a non-whitelisted function exists > + outside of arch-specific guards. > + X86: SMAP (stac/clac): __uaccess_begin()/__uaccess_end() > + ARM: PAN: uaccess_enable()/uaccess_enable() I think you meant to put "disable" here ^^^^^^ Cheers, -Matt Helsley
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