linux-kernel - [PATCH 1/9] x86, fault: Use TASK_SIZE_MAX in is

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Message-Id: <09156b63bad90a327827003c9e53faa82ef4c56e.1426728647.git.luto@kernel.org>
Date:	Wed, 18 Mar 2015 18:33:27 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Brad Spengler <spender@...ecurity.net>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 1/9] x86, fault: Use TASK_SIZE_MAX in is_prefetch

This is slightly shorter and slightly faster.  It's also more
correct: the split between user and kernel addresses is
TASK_SIZE_MAX regardless of ti->flags.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index ede025fb46f1..ae340d3761ca 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -148,7 +148,7 @@ is_prefetch(struct pt_regs *regs, unsigned long error_code, unsigned long addr)
 	instr = (void *)convert_ip_to_linear(current, regs);
 	max_instr = instr + 15;
 
-	if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE)
+	if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE_MAX)
 		return 0;
 
 	while (instr < max_instr) {
-- 
2.3.0

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