linux-kernel - [PATCH v2] x86: Preserve iopl on fork and execve

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Message-Id: <1431387505-13410-1-git-send-email-alexhenrie24@gmail.com>
Date:	Mon, 11 May 2015 17:38:25 -0600
From:	Alex Henrie <alexhenrie24@...il.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Kees Cook <keescook@...omium.org>,
	"H . Peter Anvin" <hpa@...or.com>, Doug Johnson <dougvj@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Tyler Hicks <tyhicks@...onical.com>,
	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Cc:	Alex Henrie <alexhenrie24@...il.com>
Subject: [PATCH v2] x86: Preserve iopl on fork and execve

Signed-off-by: Alex Henrie <alexhenrie24@...il.com>
Suggested-by: Doug Johnson <dougvj@...gvj.net>
---
 arch/x86/kernel/process_32.c | 2 +-
 arch/x86/kernel/process_64.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 8ed2106..0ef7078 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -205,7 +205,7 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
 	regs->cs		= __USER_CS;
 	regs->ip		= new_ip;
 	regs->sp		= new_sp;
-	regs->flags		= X86_EFLAGS_IF;
+	regs->flags		= X86_EFLAGS_IF | (X86_EFLAGS_IOPL & regs->flags);
 	force_iret();
 }
 EXPORT_SYMBOL_GPL(start_thread);
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index ddfdbf7..e21eda2 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -238,7 +238,7 @@ start_thread_common(struct pt_regs *regs, unsigned long new_ip,
 	regs->sp		= new_sp;
 	regs->cs		= _cs;
 	regs->ss		= _ss;
-	regs->flags		= X86_EFLAGS_IF;
+	regs->flags		= X86_EFLAGS_IF | (X86_EFLAGS_IOPL & regs->flags);
 	force_iret();
 }
 
-- 
2.4.0

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