Date: Thu, 3 Sep 2020 19:42:15 -0400 From: Arvind Sankar <nivedita@...m.mit.edu> To: Kees Cook <keescook@...omium.org> Cc: Sami Tolvanen <samitolvanen@...gle.com>, Masahiro Yamada <masahiroy@...nel.org>, Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, clang-built-linux@...glegroups.com, kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, x86@...nel.org, Arvind Sankar <nivedita@...m.mit.edu> Subject: Re: [PATCH v2 01/28] x86/boot/compressed: Disable relocation relaxation On Thu, Sep 03, 2020 at 02:44:41PM -0700, Kees Cook wrote: > On Thu, Sep 03, 2020 at 01:30:26PM -0700, Sami Tolvanen wrote: > > From: Arvind Sankar <nivedita@...m.mit.edu> > > > > Patch series  is a solution to allow the compressed kernel to be > > linked with -pie unconditionally, but even if merged is unlikely to be > > backported. As a simple solution that can be applied to stable as well, > > prevent the assembler from generating the relaxed relocation types using > > the -mrelax-relocations=no option. For ease of backporting, do this > > unconditionally. > > > >  https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/linker-optimization.tex#L65 > >  https://firstname.lastname@example.org/ > >  https://github.com/ClangBuiltLinux/linux/issues/1121 > >  https://reviews.llvm.org/rGc41a18cf61790fc898dcda1055c3efbf442c14c0 > >  https://email@example.com/ > > > > Reported-by: Nick Desaulniers <ndesaulniers@...gle.com> > > Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu> > > Reviewed-by: Kees Cook <keescook@...omium.org> > > -- > Kees Cook Note that since  is now in tip, assuming it doesn't get dropped for some reason, this patch isn't necessary unless you need to backport this LTO series to 5.9 or below. Thanks.
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