Messages in this thread | | | Date | Tue, 7 Apr 2015 17:26:34 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/asm/entry/64: move opportunistic sysret code to syscall code path |
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On Thu, Apr 02, 2015 at 06:46:59PM +0200, Denys Vlasenko wrote: > This change does two things: > > Copy-pastes "retint_swapgs:" code into syscall handling code, > the copy is under "syscall_return:" label. The code is unchanged > apart from some label renames. > > Removes "opportunistic sysret" code from "retint_swapgs:" code block, > since now it won't be reached by syscall return. This in fact removes > most of the code in question. > > text data bss dec hex filename > 12530 0 0 12530 30f2 entry_64.o.before > 12562 0 0 12562 3112 entry_64.o > > Run-tested. > > Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> > CC: Linus Torvalds <torvalds@linux-foundation.org> > CC: Steven Rostedt <rostedt@goodmis.org> > CC: Ingo Molnar <mingo@kernel.org> > CC: Borislav Petkov <bp@alien8.de> > CC: "H. Peter Anvin" <hpa@zytor.com> > CC: Andy Lutomirski <luto@amacapital.net> > CC: Oleg Nesterov <oleg@redhat.com> > CC: Frederic Weisbecker <fweisbec@gmail.com> > CC: Alexei Starovoitov <ast@plumgrid.com> > CC: Will Drewry <wad@chromium.org> > CC: Kees Cook <keescook@chromium.org> > CC: x86@kernel.org > CC: linux-kernel@vger.kernel.org > --- > arch/x86/kernel/entry_64.S | 158 ++++++++++++++++++++++++--------------------- > 1 file changed, 86 insertions(+), 72 deletions(-)
Acked-and-tested-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
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