linux-kernel - [PATCH 2/3] x86-32: Remove GET_THREAD

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:	Wed,  4 May 2016 22:44:37 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...e.de>
Subject: [PATCH 2/3] x86-32: Remove GET_THREAD_INFO from entry code

The entry code used to cache the thread_info pointer in the EBP register, but
all the code that used it has been moved to C.  Remove the unused code to
get the pointer.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/entry/entry_32.S | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index c84d99b..983e5d3 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -207,7 +207,6 @@
 ENTRY(ret_from_fork)
 	pushl	%eax
 	call	schedule_tail
-	GET_THREAD_INFO(%ebp)
 	popl	%eax
 
 	/* When we fork, we trace the syscall return in the child, too. */
@@ -219,7 +218,6 @@ END(ret_from_fork)
 ENTRY(ret_from_kernel_thread)
 	pushl	%eax
 	call	schedule_tail
-	GET_THREAD_INFO(%ebp)
 	popl	%eax
 	movl	PT_EBP(%esp), %eax
 	call	*PT_EBX(%esp)
@@ -247,7 +245,6 @@ ENDPROC(ret_from_kernel_thread)
 ret_from_exception:
 	preempt_stop(CLBR_ANY)
 ret_from_intr:
-	GET_THREAD_INFO(%ebp)
 #ifdef CONFIG_VM86
 	movl	PT_EFLAGS(%esp), %eax		# mix EFLAGS and CS
 	movb	PT_CS(%esp), %al
-- 
2.5.5