linux-kernel - [PATCH v8 09/14] arch/x86: enable task isolation functionality

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Message-ID: <1445373372-6567-10-git-send-email-cmetcalf@ezchip.com>
Date:	Tue, 20 Oct 2015 16:36:07 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Gilad Ben Yossef <giladb@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
CC:	Chris Metcalf <cmetcalf@...hip.com>
Subject: [PATCH v8 09/14] arch/x86: enable task isolation functionality

In prepare_exit_to_usermode(), call task_isolation_ready()
when we are checking the thread-info flags, and after we've handled
the other work, call task_isolation_enter() unconditionally.

In syscall_trace_enter_phase1(), we add the necessary support for
strict-mode detection of syscalls.

We add strict reporting for the kernel exception types that do
not result in signals, namely non-signalling page faults and
non-signalling MPX fixups.

Signed-off-by: Chris Metcalf <cmetcalf@...hip.com>
---
 arch/x86/entry/common.c | 10 +++++++++-
 arch/x86/kernel/traps.c |  2 ++
 arch/x86/mm/fault.c     |  2 ++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 80dcc9261ca3..13426c0656b4 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -21,6 +21,7 @@
 #include <linux/context_tracking.h>
 #include <linux/user-return-notifier.h>
 #include <linux/uprobes.h>
+#include <linux/isolation.h>
 
 #include <asm/desc.h>
 #include <asm/traps.h>
@@ -81,6 +82,10 @@ unsigned long syscall_trace_enter_phase1(struct pt_regs *regs, u32 arch)
 	 */
 	if (work & _TIF_NOHZ) {
 		enter_from_user_mode();
+		if (task_isolation_check_syscall(regs->orig_ax)) {
+			regs->orig_ax = -1;
+			return 0;
+		}
 		work &= ~_TIF_NOHZ;
 	}
 #endif
@@ -234,7 +239,8 @@ __visible void prepare_exit_to_usermode(struct pt_regs *regs)
 
 		if (!(cached_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME |
 				      _TIF_UPROBE | _TIF_NEED_RESCHED |
-				      _TIF_USER_RETURN_NOTIFY)))
+				      _TIF_USER_RETURN_NOTIFY)) &&
+		    task_isolation_ready())
 			break;
 
 		/* We have work to do. */
@@ -258,6 +264,8 @@ __visible void prepare_exit_to_usermode(struct pt_regs *regs)
 		if (cached_flags & _TIF_USER_RETURN_NOTIFY)
 			fire_user_return_notifiers();
 
+		task_isolation_enter();
+
 		/* Disable IRQs and retry */
 		local_irq_disable();
 	}
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 346eec73f7db..1ed4d8a52d23 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -36,6 +36,7 @@
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/io.h>
+#include <linux/isolation.h>
 
 #ifdef CONFIG_EISA
 #include <linux/ioport.h>
@@ -398,6 +399,7 @@ dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
 	case 2:	/* Bound directory has invalid entry. */
 		if (mpx_handle_bd_fault())
 			goto exit_trap;
+		task_isolation_check_exception("bounds check");
 		break; /* Success, it was handled */
 	case 1: /* Bound violation. */
 		info = mpx_generate_siginfo(regs);
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index eef44d9a3f77..7b23487a3bd7 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -14,6 +14,7 @@
 #include <linux/prefetch.h>		/* prefetchw			*/
 #include <linux/context_tracking.h>	/* exception_enter(), ...	*/
 #include <linux/uaccess.h>		/* faulthandler_disabled()	*/
+#include <linux/isolation.h>		/* task_isolation_check_exception */
 
 #include <asm/traps.h>			/* dotraplinkage, ...		*/
 #include <asm/pgalloc.h>		/* pgd_*(), ...			*/
@@ -1148,6 +1149,7 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
 		local_irq_enable();
 		error_code |= PF_USER;
 		flags |= FAULT_FLAG_USER;
+		task_isolation_check_exception("page fault at %#lx", address);
 	} else {
 		if (regs->flags & X86_EFLAGS_IF)
 			local_irq_enable();
-- 
2.1.2

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