linux-kernel - [PATCH 1/4] x86/events: down with test_thread_flag(TIF

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]

Message-ID: <1460657414-12530-2-git-send-email-dsafonov@virtuozzo.com>
Date:	Thu, 14 Apr 2016 21:10:11 +0300
From:	Dmitry Safonov <dsafonov@...tuozzo.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<luto@...capital.net>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<hpa@...or.com>, <x86@...nel.org>, <rric@...nel.org>,
	<oprofile-list@...ts.sf.net>, <0x7f454c46@...il.com>,
	Dmitry Safonov <dsafonov@...tuozzo.com>
Subject: [PATCH 1/4] x86/events: down with test_thread_flag(TIF_IA32)

We can use user_64bit_mode(regs) here instead of thread flag
because we have full register frame.

Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
---
 arch/x86/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 041e442a3e28..91d101a9a6e9 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2269,7 +2269,7 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
 	struct stack_frame_ia32 frame;
 	const void __user *fp;
 
-	if (!test_thread_flag(TIF_IA32))
+	if (user_64bit_mode(regs))
 		return 0;
 
 	cs_base = get_segment_base(regs->cs);
-- 
2.8.0