linux-kernel - [PATCH v5 02/27] x86: assembly, use SYM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 30 Nov 2017 15:46:28 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     mingo@...hat.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v5 02/27] x86: assembly, use SYM_DATA for data

We make proper use of SYM_DATA on global data instead of marking them as
ENTRY. ENTRY is intended for functions and shall be paired with ENDPROC.
ENTRY also aligns symbols which creates unnecessary holes here between
data.

ENTRY from saved_eip in wakeup_32 and many saved_* in wakeup_64 is
simply dropped, as these symbols are local only.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <len.brown@...el.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: linux-pm@...r.kernel.org
---
 arch/x86/kernel/acpi/wakeup_32.S |  4 ++--
 arch/x86/kernel/acpi/wakeup_64.S | 14 +++++++-------
 arch/x86/kernel/head_32.S        |  6 ++----
 arch/x86/kernel/head_64.S        |  5 ++---
 4 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/acpi/wakeup_32.S b/arch/x86/kernel/acpi/wakeup_32.S
index 0c26b1b44e51..feac1e5ecba0 100644
--- a/arch/x86/kernel/acpi/wakeup_32.S
+++ b/arch/x86/kernel/acpi/wakeup_32.S
@@ -89,8 +89,8 @@ ret_point:
 
 .data
 ALIGN
-ENTRY(saved_magic)	.long	0
-ENTRY(saved_eip)	.long	0
+SYM_DATA(saved_magic,	.long 0)
+saved_eip:		.long 0
 
 # saved registers
 saved_idt:	.long	0,0
diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index 50b8ed0317a3..551758f48eb7 100644
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -125,12 +125,12 @@ ENTRY(do_suspend_lowlevel)
 ENDPROC(do_suspend_lowlevel)
 
 .data
-ENTRY(saved_rbp)	.quad	0
-ENTRY(saved_rsi)	.quad	0
-ENTRY(saved_rdi)	.quad	0
-ENTRY(saved_rbx)	.quad	0
+saved_rbp:		.quad	0
+saved_rsi:		.quad	0
+saved_rdi:		.quad	0
+saved_rbx:		.quad	0
 
-ENTRY(saved_rip)	.quad	0
-ENTRY(saved_rsp)	.quad	0
+saved_rip:		.quad	0
+saved_rsp:		.quad	0
 
-ENTRY(saved_magic)	.quad	0
+SYM_DATA(saved_magic,	.quad	0)
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index c29020907886..3bfe12f4a015 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -507,10 +507,8 @@ GLOBAL(early_recursion_flag)
 
 __REFDATA
 	.align 4
-ENTRY(initial_code)
-	.long i386_start_kernel
-ENTRY(setup_once_ref)
-	.long setup_once
+SYM_DATA(initial_code,		.long i386_start_kernel)
+SYM_DATA(setup_once_ref,	.long setup_once)
 
 /*
  * BSS section
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 58087ab1782e..3891cc6d62dc 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -454,9 +454,8 @@ early_gdt_descr:
 early_gdt_descr_base:
 	.quad	INIT_PER_CPU_VAR(gdt_page)
 
-ENTRY(phys_base)
-	/* This must match the first entry in level2_kernel_pgt */
-	.quad   0x0000000000000000
+/* This must match the first entry in level2_kernel_pgt */
+SYM_DATA(phys_base, .quad 0x0000000000000000)
 EXPORT_SYMBOL(phys_base)
 
 #include "../../x86/xen/xen-head.S"
-- 
2.15.0