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From: tip-bot for Andy Lutomirski <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: andrew.cooper3@citrix.com, luto@amacapital.net,
	brgerst@gmail.com, torvalds@linux-foundation.org,
	linux-kernel@vger.kernel.org, oleg@redhat.com, luto@kernel.org,
	hpa@zytor.com, bp@alien8.de, mingo@kernel.org,
	tglx@linutronix.de, peterz@infradead.org, dvlasenk@redhat.com
Subject: [tip:x86/asm] x86/entry/32: Restore FLAGS on SYSEXIT
Date: Thu, 10 Mar 2016 03:01:54 -0800	[thread overview]
Message-ID: <tip-c2c9b52fab0d0cf993476ed4c34f24da5a1205ae@git.kernel.org> (raw)
In-Reply-To: <3f98b207472dc9784838eb5ca2b89dcc845ce269.1457578375.git.luto@kernel.org>

Commit-ID:  c2c9b52fab0d0cf993476ed4c34f24da5a1205ae
Gitweb:     http://git.kernel.org/tip/c2c9b52fab0d0cf993476ed4c34f24da5a1205ae
Author:     Andy Lutomirski <luto@kernel.org>
AuthorDate: Wed, 9 Mar 2016 19:00:27 -0800
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 10 Mar 2016 09:48:12 +0100

x86/entry/32: Restore FLAGS on SYSEXIT

We weren't restoring FLAGS at all on SYSEXIT.  Apparently no one cared.

With this patch applied, native kernels should always honor
task_pt_regs()->flags, which opens the door for some sys_iopl()
cleanups.  I'll do those as a separate series, though, since getting
it right will involve tweaking some paravirt ops.

( The short version is that, before this patch, sys_iopl(), invoked via
  SYSENTER, wasn't guaranteed to ever transfer the updated
  regs->flags, so sys_iopl() had to change the hardware flags register
  as well. )

Reported-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/3f98b207472dc9784838eb5ca2b89dcc845ce269.1457578375.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/entry/entry_32.S | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 8daa812..7610906 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -343,6 +343,15 @@ sysenter_past_esp:
 	popl	%eax			/* pt_regs->ax */
 
 	/*
+	 * Restore all flags except IF. (We restore IF separately because
+	 * STI gives a one-instruction window in which we won't be interrupted,
+	 * whereas POPF does not.)
+	 */
+	addl	$PT_EFLAGS-PT_DS, %esp	/* point esp at pt_regs->flags */
+	btr	$X86_EFLAGS_IF_BIT, (%esp)
+	popfl
+
+	/*
 	 * Return back to the vDSO, which will pop ecx and edx.
 	 * Don't bother with DS and ES (they already contain __USER_DS).
 	 */

  reply	other threads:[~2016-03-10 11:03 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-10  3:00 [PATCH v2 00/12] x86: Various SYSENTER/SYSEXIT/#DB fixes and cleanups Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 01/12] selftests/x86: In syscall_nt, test NT|TF as well Andy Lutomirski
2016-03-10 11:00   ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 02/12] x86/entry/compat: In SYSENTER, sink AC clearing below the existing FLAGS test Andy Lutomirski
2016-03-10 11:01   ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 03/12] x86/entry/32: Filter NT and speed up AC filtering in SYSENTER Andy Lutomirski
2016-03-10 11:01   ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 04/12] x86/entry/32: Restore FLAGS on SYSEXIT Andy Lutomirski
2016-03-10 11:01   ` tip-bot for Andy Lutomirski [this message]
2016-03-10  3:00 ` [PATCH v2 05/12] x86/traps: Clear TIF_BLOCKSTEP on all debug exceptions Andy Lutomirski
2016-03-10 11:02   ` [tip:x86/asm] x86/entry/traps: " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 06/12] x86/traps: Clear DR6 early in do_debug and improve the comment Andy Lutomirski
2016-03-10 11:02   ` [tip:x86/asm] x86/entry/traps: Clear DR6 early in do_debug() " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 07/12] x86/entry: Vastly simplify SYSENTER TF handling Andy Lutomirski
2016-03-10 11:03   ` [tip:x86/asm] x86/entry: Vastly simplify SYSENTER TF (single-step) handling tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 08/12] x86/entry: Only allocate space for SYSENTER_stack if needed Andy Lutomirski
2016-03-10 11:03   ` [tip:x86/asm] x86/entry: Only allocate space for tss_struct::SYSENTER_stack " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 09/12] x86/entry/32: Simplify and fix up the SYSENTER stack #DB/NMI fixup Andy Lutomirski
2016-03-10 11:03   ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 10/12] x86/entry/32: Add and check a stack canary for the SYSENTER stack Andy Lutomirski
2016-03-10 11:04   ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 11/12] x86/entry: Remove TIF_SINGLESTEP entry work Andy Lutomirski
2016-03-10 11:04   ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-03-10  3:00 ` [PATCH v2 12/12] x86/entry: Improve system call entry comments Andy Lutomirski
2016-03-10 11:05   ` [tip:x86/asm] " tip-bot for Andy Lutomirski

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