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Date: Tue, 7 Apr 2015 17:26:34 +0200 From: Borislav Petkov <bp@...en8.de> To: Denys Vlasenko <dvlasenk@...hat.com> Cc: Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Steven Rostedt <rostedt@...dmis.org>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...capital.net>, Oleg Nesterov <oleg@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Alexei Starovoitov <ast@...mgrid.com>, Will Drewry <wad@...omium.org>, Kees Cook <keescook@...omium.org>, x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] x86/asm/entry/64: move opportunistic sysret code to syscall code path 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@...hat.com> > CC: Linus Torvalds <torvalds@...ux-foundation.org> > CC: Steven Rostedt <rostedt@...dmis.org> > CC: Ingo Molnar <mingo@...nel.org> > CC: Borislav Petkov <bp@...en8.de> > CC: "H. Peter Anvin" <hpa@...or.com> > CC: Andy Lutomirski <luto@...capital.net> > CC: Oleg Nesterov <oleg@...hat.com> > CC: Frederic Weisbecker <fweisbec@...il.com> > CC: Alexei Starovoitov <ast@...mgrid.com> > CC: Will Drewry <wad@...omium.org> > CC: Kees Cook <keescook@...omium.org> > CC: x86@...nel.org > CC: linux-kernel@...r.kernel.org > --- > arch/x86/kernel/entry_64.S | 158 ++++++++++++++++++++++++--------------------- > 1 file changed, 86 insertions(+), 72 deletions(-) Acked-and-tested-by: Borislav Petkov <bp@...e.de> -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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