From: Alex Henrie <alexhenrie24@gmail.com>
To: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
Kees Cook <keescook@chromium.org>,
"H . Peter Anvin" <hpa@zytor.com>,
Doug Johnson <dougvj@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Tyler Hicks <tyhicks@canonical.com>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-kernel@vger.kernel.org
Cc: Alex Henrie <alexhenrie24@gmail.com>
Subject: [PATCH v2] x86: Preserve iopl on fork and execve
Date: Mon, 11 May 2015 17:38:25 -0600 [thread overview]
Message-ID: <1431387505-13410-1-git-send-email-alexhenrie24@gmail.com> (raw)
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Suggested-by: Doug Johnson <dougvj@dougvj.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
next reply other threads:[~2015-05-11 23:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 23:38 Alex Henrie [this message]
2015-05-12 6:40 ` Ingo Molnar
2015-05-12 15:13 ` Linus Torvalds
2015-05-12 18:24 ` H. Peter Anvin
2015-05-12 15:24 ` Arjan van de Ven
2015-05-12 15:25 ` Arjan van de Ven
2015-05-12 15:47 ` Austin S Hemmelgarn
2015-05-12 18:05 ` Alex Henrie
2015-05-12 18:12 ` Austin S Hemmelgarn
2015-05-14 10:41 ` Josh Triplett
2015-05-15 0:52 ` H. Peter Anvin
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