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@xxxxxxxxxxxx> > > > > Patch series [4] 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. > > > > [0] https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/linker-optimization.tex#L65 > > [1] https://lore.kernel.org/lkml/20200807194100.3570838-1-ndesaulniers@xxxxxxxxxx/ > > [2] https://github.com/ClangBuiltLinux/linux/issues/1121 > > [3] https://reviews.llvm.org/rGc41a18cf61790fc898dcda1055c3efbf442c14c0 > > [4] https://lore.kernel.org/lkml/20200731202738.2577854-1-nivedita@xxxxxxxxxxxx/ > > > > Reported-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > > Signed-off-by: Arvind Sankar <nivedita@xxxxxxxxxxxx> > > Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> > > -- > Kees Cook Note that since [4] 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.
