Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753422AbeAGAKt (ORCPT + 1 other); Sat, 6 Jan 2018 19:10:49 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:59338 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752249AbeAGAKr (ORCPT ); Sat, 6 Jan 2018 19:10:47 -0500 Message-ID: <1515283824.29312.288.camel@infradead.org> Subject: [RFC PATCH 13/12] Retpoline vs. CONFIG_TRIM_UNUSED_SYMBOLS From: David Woodhouse To: Andi Kleen , "Van De Ven, Arjan" Cc: Paul Turner , LKML , Linus Torvalds , Greg Kroah-Hartman , Tim Chen , Dave Hansen , tglx@linutronix.de, Kees Cook , Rik van Riel , Peter Zijlstra , Andy Lutomirski , Jiri Kosina , gnomes@lxorguk.ukuu.org.uk In-Reply-To: <1515239374-23361-1-git-send-email-dwmw@amazon.co.uk> References: <1515239374-23361-1-git-send-email-dwmw@amazon.co.uk> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-JGaWnG2mS8u6MR+A+rFV" Date: Sun, 07 Jan 2018 00:10:24 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: --=-JGaWnG2mS8u6MR+A+rFV Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Arjan pointed out that CONFIG_TRIM_UNUSED_SYMBOLS *really* doesn't like the dot in the symbols that GCC uses for the thunks. This seems to work, although my eyes are bleeding just a little bit. Given this, and the hack we already needed for MODVERSIONS, I wonder if a better approach might be to export the thunks using underscores in place of the dots, which is a relatively simple abuse of __EXPORT_SYMBOL(__x86_indirect_thunk_foo,__x86.indirect_thunk.foo,), and then have a hack either when generating or loading modules to do the same replacement. diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S index ccb117a4588b..64d7a45ea954 100644 --- a/arch/x86/lib/retpoline.S +++ b/arch/x86/lib/retpoline.S @@ -8,7 +8,13 @@ =C2=A0#include =C2=A0#include =C2=A0 -.macro THUNK reg +#ifdef CONFIG_TRIM_UNUSED_KSYMS +#define EXPORT_REG(reg) __is_defined(__KSYM___x86_indirect_thunk_ ## reg) +#else +#define EXPORT_REG(reg) 1 +#endif + +.macro THUNK reg export =C2=A0 .section .text.__x86.indirect_thunk.\reg =C2=A0 =C2=A0ENTRY(__x86.indirect_thunk.\reg) @@ -16,15 +22,33 @@ ENTRY(__x86.indirect_thunk.\reg) =C2=A0 NOSPEC_JMP %\reg =C2=A0 CFI_ENDPROC =C2=A0ENDPROC(__x86.indirect_thunk.\reg) -EXPORT_SYMBOL(__x86.indirect_thunk.\reg) + +.if \export + EXPORT_SYMBOL_FORCE(__x86.indirect_thunk.\reg) +.endif =C2=A0.endm =C2=A0 -#ifdef CONFIG_64BIT -.irp reg rax rbx rcx rdx rsi rdi rbp r8 r9 r10 r11 r12 r13 r14 r15 - THUNK \reg -.endr +#ifdef __KSYM_DEPS__ +#define GENERATE_THUNK(reg) EXPORT_SYMBOL(__x86.indirect_thunk. ## reg) =C2=A0#else -.irp reg eax ebx ecx edx esi edi ebp - THUNK \reg -.endr +#define GENERATE_THUNK(reg) THUNK reg EXPORT_REG(reg) +#endif + +GENERATE_THUNK(_ASM_AX) +GENERATE_THUNK(_ASM_BX) +GENERATE_THUNK(_ASM_CX) +GENERATE_THUNK(_ASM_DX) +GENERATE_THUNK(_ASM_SI) +GENERATE_THUNK(_ASM_DI) +GENERATE_THUNK(_ASM_BP) +GENERATE_THUNK(_ASM_SP) +#ifdef CONFIG_64BIT +GENERATE_THUNK(r8) +GENERATE_THUNK(r9) +GENERATE_THUNK(r10) +GENERATE_THUNK(r11) +GENERATE_THUNK(r12) +GENERATE_THUNK(r13) +GENERATE_THUNK(r14) +GENERATE_THUNK(r15) =C2=A0#endif diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h index 719db1968d81..b13bb65e2530 100644 --- a/include/asm-generic/export.h +++ b/include/asm-generic/export.h @@ -63,33 +63,33 @@ KSYM(__kcrctab_\name): =C2=A0 =C2=A0#if defined(__KSYM_DEPS__) =C2=A0 -#define __EXPORT_SYMBOL(sym, val, sec) =3D=3D=3D __KSYM_##sym =3D=3D=3D +#define __EXPORT_SYMBOL(sym, val, sec, force) =3D=3D=3D __KSYM_##sym =3D= =3D=3D =C2=A0 =C2=A0#elif defined(CONFIG_TRIM_UNUSED_KSYMS) =C2=A0 =C2=A0#include =C2=A0#include =C2=A0 -#define __EXPORT_SYMBOL(sym, val, sec) \ - __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym)) +#define __EXPORT_SYMBOL(sym, val, sec, force) \ + =C2=A0__cond_export_sym(sym, val, sec, __or(force, __is_defined(__KSYM_##= sym))) =C2=A0#define __cond_export_sym(sym, val, sec, conf) \ =C2=A0 ___cond_export_sym(sym, val, sec, conf) =C2=A0#define ___cond_export_sym(sym, val, sec, enabled) \ =C2=A0 __cond_export_sym_##enabled(sym, val, sec) =C2=A0#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val,= sec =C2=A0#define __cond_export_sym_0(sym, val, sec) /* nothing */ - =C2=A0#else -#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec +#define __EXPORT_SYMBOL(sym, val, sec, force) ___EXPORT_SYMBOL sym, val, s= ec =C2=A0#endif =C2=A0 =C2=A0#define EXPORT_SYMBOL(name) \ - __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)),) + __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), , 0) =C2=A0#define EXPORT_SYMBOL_GPL(name)=C2=A0 \ - __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), _gpl) + __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), _gpl, 0) =C2=A0#define EXPORT_DATA_SYMBOL(name) \ - __EXPORT_SYMBOL(name, KSYM(name),) + __EXPORT_SYMBOL(name, KSYM(name), , 0) =C2=A0#define EXPORT_DATA_SYMBOL_GPL(name) \ - __EXPORT_SYMBOL(name, KSYM(name),_gpl) - + __EXPORT_SYMBOL(name, KSYM(name), _gpl, 0) +#define EXPORT_SYMBOL_FORCE(name) \ + __EXPORT_SYMBOL(name, KSYM(name), , 1) =C2=A0#endif diff --git a/scripts/adjust_autoksyms.sh b/scripts/adjust_autoksyms.sh index 513da1a4a2da..991cd136291b 100755 --- 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