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* [patch V3 00/20] x86/iopl: Prevent user space from using CLI/STI with iopl(3)
@ 2019-11-13 20:42 Thomas Gleixner
  2019-11-13 20:42 ` [patch V3 01/20] x86/ptrace: Prevent truncation of bitmap size Thomas Gleixner
                   ` (20 more replies)
  0 siblings, 21 replies; 54+ messages in thread
From: Thomas Gleixner @ 2019-11-13 20:42 UTC (permalink / raw)
  To: LKML
  Cc: x86, Andy Lutomirski, Linus Torvalds, Stephen Hemminger,
	Willy Tarreau, Juergen Gross, Sean Christopherson,
	H. Peter Anvin

This is the third version of the attempt to confine the unwanted side
effects of iopl(). The first version of this series can be found here:

   https://lore.kernel.org/r/20191106193459.581614484@linutronix.de

Second version is here:

   https://lore.kernel.org/r/20191111220314.519933535@linutronix.de

The V1 cover letter also contains a longer variant of the
background. Summary:

iopl(level = 3) enables aside of access to all 65536 I/O ports also the
usage of CLI/STI in user space.

Disabling interrupts in user space can lead to system lockups and breaks
assumptions in the kernel that userspace always runs with interrupts
enabled.

iopl() is often preferred over ioperm() as it avoids the overhead of
copying the tasks I/O bitmap to the TSS bitmap on context switch. This
overhead can be avoided by providing a all zeroes bitmap in the TSS and
switching the TSS bitmap offset to this permit all IO bitmap. It's
marginally slower than iopl() which is a one time setup, but prevents the
usage of CLI/STI in user space.

The changes vs. V3:

    - Split out the restructuring of the first/subsequent ioperm()
      invocation into a seperate patch to address the inconsisteny which
      Andy detected in the patch which introduces the concept of
      invalidating the I/O bitmap base to speed up context switching.
      This change is moved in front so the subsequent changes are
      functionally correct.

    - Moved the non HW TSS data related to I/O bitmap(s) into a seperate
      data structure. Modified version of Ingos proposed patch.

    - Made struct memeber names more consistent (Ingo)

    - Dropped the bitmap union. It is not longer necessary because V2
      already dropped the finer grained copying algorithm. The sequence
      count approach should avoid most of the copying overhead when the
      number of ioperm() using processes is very low which is the normal
      case.

    - Dropped the pointer storage of the bitmap in the TSS data as it is
      not required (Peter, Andy)

    - Fixed the missing refcount setting in the bitmap duplication code
      path. (Peter, Andy)

    - Updated changelog and comment to explain the bitmap invalidation
      logic. (Andy)

    - Removed TIF_IO_BITMAP from the TIF flags which are evaluated on the
      next task for entering the slow path.

    - Folded the NULL pointer check fix

    - Simplified the config option in the legacy removal patch (Andy)

    - Extended the scope of the config option to disable ioperm() along
      with iopl() which also mokes all related storage and functions
      compile time conditional. (Andy)

The series is also available from git:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/iopl

Thanks,

	tglx
---
 arch/x86/Kconfig                        |   18 ++
 arch/x86/entry/common.c                 |    4 
 arch/x86/include/asm/io_bitmap.h        |   29 ++++
 arch/x86/include/asm/paravirt.h         |    4 
 arch/x86/include/asm/paravirt_types.h   |    2 
 arch/x86/include/asm/pgtable_32_types.h |    2 
 arch/x86/include/asm/processor.h        |  113 ++++++++++-------
 arch/x86/include/asm/ptrace.h           |    6 
 arch/x86/include/asm/switch_to.h        |   10 +
 arch/x86/include/asm/thread_info.h      |   14 +-
 arch/x86/include/asm/xen/hypervisor.h   |    2 
 arch/x86/kernel/cpu/common.c            |  188 ++++++++++++----------------
 arch/x86/kernel/doublefault.c           |    2 
 arch/x86/kernel/ioport.c                |  209 +++++++++++++++++++++-----------
 arch/x86/kernel/paravirt.c              |    2 
 arch/x86/kernel/process.c               |  200 ++++++++++++++++++++++++------
 arch/x86/kernel/process_32.c            |   77 -----------
 arch/x86/kernel/process_64.c            |   86 -------------
 arch/x86/kernel/ptrace.c                |   12 +
 arch/x86/kvm/vmx/vmx.c                  |    8 -
 arch/x86/mm/cpu_entry_area.c            |    8 +
 arch/x86/xen/enlighten_pv.c             |   10 -
 tools/testing/selftests/x86/ioperm.c    |   16 ++
 tools/testing/selftests/x86/iopl.c      |  129 ++++++++++++++++++-
 24 files changed, 674 insertions(+), 477 deletions(-)


^ permalink raw reply	[flat|nested] 54+ messages in thread
* [tip: x86/iopl] x86/iopl: Restrict iopl() permission scope
@ 2019-11-16 11:51 tip-bot2 for Thomas Gleixner
  2019-11-24 11:02 ` Ingo Molnar
  0 siblings, 1 reply; 54+ messages in thread
From: tip-bot2 for Thomas Gleixner @ 2019-11-16 11:51 UTC (permalink / raw)
  To: linux-tip-commits
  Cc: Thomas Gleixner, Andy Lutomirski, Ingo Molnar, Borislav Petkov,
	linux-kernel

The following commit has been merged into the x86/iopl branch of tip:

Commit-ID:     c8137ace56383688af911fea5934c71ad158135e
Gitweb:        https://git.kernel.org/tip/c8137ace56383688af911fea5934c71ad158135e
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Mon, 11 Nov 2019 23:03:28 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 16 Nov 2019 11:24:05 +01:00

x86/iopl: Restrict iopl() permission scope

The access to the full I/O port range can be also provided by the TSS I/O
bitmap, but that would require to copy 8k of data on scheduling in the
task. As shown with the sched out optimization TSS.io_bitmap_base can be
used to switch the incoming task to a preallocated I/O bitmap which has all
bits zero, i.e. allows access to all I/O ports.

Implementing this allows to provide an iopl() emulation mode which restricts
the IOPL level 3 permissions to I/O port access but removes the STI/CLI
permission which is coming with the hardware IOPL mechansim.

Provide a config option to switch IOPL to emulation mode, make it the
default and while at it also provide an option to disable IOPL completely.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
---
 arch/x86/Kconfig                        | 32 +++++++++-
 arch/x86/include/asm/pgtable_32_types.h |  2 +-
 arch/x86/include/asm/processor.h        | 28 ++++++--
 arch/x86/kernel/cpu/common.c            |  5 +-
 arch/x86/kernel/ioport.c                | 87 ++++++++++++++++--------
 arch/x86/kernel/process.c               | 32 +++++----
 6 files changed, 139 insertions(+), 47 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d6e1faa..2aad1cd 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1254,6 +1254,38 @@ config X86_VSYSCALL_EMULATION
 	 Disabling this option saves about 7K of kernel size and
 	 possibly 4K of additional runtime pagetable memory.
 
+choice
+	prompt "IOPL"
+	default X86_IOPL_EMULATION
+
+config X86_IOPL_EMULATION
+	bool "IOPL Emulation"
+	---help---
+	  Legacy IOPL support is an overbroad mechanism which allows user
+	  space aside of accessing all 65536 I/O ports also to disable
+	  interrupts. To gain this access the caller needs CAP_SYS_RAWIO
+	  capabilities and permission from potentially active security
+	  modules.
+
+	  The emulation restricts the functionality of the syscall to
+	  only allowing the full range I/O port access, but prevents the
+	  ability to disable interrupts from user space.
+
+config X86_IOPL_LEGACY
+	bool "IOPL Legacy"
+	---help---
+	Allow the full IOPL permissions, i.e. user space access to all
+	65536 I/O ports and also the ability to disable interrupts, which
+	is overbroad and can result in system lockups.
+
+config X86_IOPL_NONE
+	bool "IOPL None"
+	---help---
+	Disable the IOPL permission syscall. That's the safest option as
+	no sane application should depend on this functionality.
+
+endchoice
+
 config TOSHIBA
 	tristate "Toshiba Laptop support"
 	depends on X86_32
diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h
index b0bc0ff..0fab4bf 100644
--- a/arch/x86/include/asm/pgtable_32_types.h
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -44,7 +44,7 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */
  * Define this here and validate with BUILD_BUG_ON() in pgtable_32.c
  * to avoid include recursion hell
  */
-#define CPU_ENTRY_AREA_PAGES	(NR_CPUS * 40)
+#define CPU_ENTRY_AREA_PAGES	(NR_CPUS * 41)
 
 #define CPU_ENTRY_AREA_BASE						\
 	((FIXADDR_TOT_START - PAGE_SIZE * (CPU_ENTRY_AREA_PAGES + 1))   \
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 40bb0f7..b0e02aa 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -332,19 +332,21 @@ struct x86_hw_tss {
 #define IO_BITMAP_BYTES			(IO_BITMAP_BITS / BITS_PER_BYTE)
 #define IO_BITMAP_LONGS			(IO_BITMAP_BYTES / sizeof(long))
 
-#define IO_BITMAP_OFFSET_VALID					\
+#define IO_BITMAP_OFFSET_VALID_MAP				\
 	(offsetof(struct tss_struct, io_bitmap.bitmap) -	\
 	 offsetof(struct tss_struct, x86_tss))
 
+#define IO_BITMAP_OFFSET_VALID_ALL				\
+	(offsetof(struct tss_struct, io_bitmap.mapall) -	\
+	 offsetof(struct tss_struct, x86_tss))
+
 /*
- * sizeof(unsigned long) coming from an extra "long" at the end
- * of the iobitmap.
- *
- * -1? seg base+limit should be pointing to the address of the
- * last valid byte
+ * sizeof(unsigned long) coming from an extra "long" at the end of the
+ * iobitmap. The limit is inclusive, i.e. the last valid byte.
  */
 #define __KERNEL_TSS_LIMIT	\
-	(IO_BITMAP_OFFSET_VALID + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)
+	(IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \
+	 sizeof(unsigned long) - 1)
 
 /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */
 #define IO_BITMAP_OFFSET_INVALID	(__KERNEL_TSS_LIMIT + 1)
@@ -380,6 +382,12 @@ struct x86_io_bitmap {
 	 * be within the limit.
 	 */
 	unsigned long		bitmap[IO_BITMAP_LONGS + 1];
+
+	/*
+	 * Special I/O bitmap to emulate IOPL(3). All bytes zero,
+	 * except the additional byte at the end.
+	 */
+	unsigned long		mapall[IO_BITMAP_LONGS + 1];
 };
 
 struct tss_struct {
@@ -506,7 +514,13 @@ struct thread_struct {
 #endif
 	/* IO permissions: */
 	struct io_bitmap	*io_bitmap;
+
+	/*
+	 * IOPL. Priviledge level dependent I/O permission which includes
+	 * user space CLI/STI when granted.
+	 */
 	unsigned long		iopl;
+	unsigned long		iopl_emul;
 
 	mm_segment_t		addr_limit;
 
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 79dd544..7bf402b 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1864,6 +1864,11 @@ void cpu_init(void)
 	tss->io_bitmap.prev_max = 0;
 	tss->io_bitmap.prev_sequence = 0;
 	memset(tss->io_bitmap.bitmap, 0xff, sizeof(tss->io_bitmap.bitmap));
+	/*
+	 * Invalidate the extra array entry past the end of the all
+	 * permission bitmap as required by the hardware.
+	 */
+	tss->io_bitmap.mapall[IO_BITMAP_LONGS] = ~0UL;
 	set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss);
 
 	load_TR_desc();
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 3548563..9ed9458 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -17,25 +17,41 @@
 static atomic64_t io_bitmap_sequence;
 
 void io_bitmap_share(struct task_struct *tsk)
- {
-	/*
-	 * Take a refcount on current's bitmap. It can be used by
-	 * both tasks as long as none of them changes the bitmap.
-	 */
-	refcount_inc(&current->thread.io_bitmap->refcnt);
-	tsk->thread.io_bitmap = current->thread.io_bitmap;
+{
+	/* Can be NULL when current->thread.iopl_emul == 3 */
+	if (current->thread.io_bitmap) {
+		/*
+		 * Take a refcount on current's bitmap. It can be used by
+		 * both tasks as long as none of them changes the bitmap.
+		 */
+		refcount_inc(&current->thread.io_bitmap->refcnt);
+		tsk->thread.io_bitmap = current->thread.io_bitmap;
+	}
 	set_tsk_thread_flag(tsk, TIF_IO_BITMAP);
 }
 
+static void task_update_io_bitmap(void)
+{
+	struct thread_struct *t = &current->thread;
+
+	if (t->iopl_emul == 3 || t->io_bitmap) {
+		/* TSS update is handled on exit to user space */
+		set_thread_flag(TIF_IO_BITMAP);
+	} else {
+		clear_thread_flag(TIF_IO_BITMAP);
+		/* Invalidate TSS */
+		preempt_disable();
+		tss_update_io_bitmap();
+		preempt_enable();
+	}
+}
+
 void io_bitmap_exit(void)
 {
 	struct io_bitmap *iobm = current->thread.io_bitmap;
 
 	current->thread.io_bitmap = NULL;
-	clear_thread_flag(TIF_IO_BITMAP);
-	preempt_disable();
-	tss_update_io_bitmap();
-	preempt_enable();
+	task_update_io_bitmap();
 	if (iobm && refcount_dec_and_test(&iobm->refcnt))
 		kfree(iobm);
 }
@@ -157,36 +173,55 @@ SYSCALL_DEFINE3(ioperm, unsigned long, from, unsigned long, num, int, turn_on)
  */
 SYSCALL_DEFINE1(iopl, unsigned int, level)
 {
-	struct pt_regs *regs = current_pt_regs();
 	struct thread_struct *t = &current->thread;
+	struct pt_regs *regs = current_pt_regs();
+	unsigned int old;
 
 	/*
 	 * Careful: the IOPL bits in regs->flags are undefined under Xen PV
 	 * and changing them has no effect.
 	 */
-	unsigned int old = t->iopl >> X86_EFLAGS_IOPL_BIT;
+	if (IS_ENABLED(CONFIG_X86_IOPL_NONE))
+		return -ENOSYS;
 
 	if (level > 3)
 		return -EINVAL;
+
+	if (IS_ENABLED(CONFIG_X86_IOPL_EMULATION))
+		old = t->iopl_emul;
+	else
+		old = t->iopl >> X86_EFLAGS_IOPL_BIT;
+
+	/* No point in going further if nothing changes */
+	if (level == old)
+		return 0;
+
 	/* Trying to gain more privileges? */
 	if (level > old) {
 		if (!capable(CAP_SYS_RAWIO) ||
 		    security_locked_down(LOCKDOWN_IOPORT))
 			return -EPERM;
 	}
-	/*
-	 * Change the flags value on the return stack, which has been set
-	 * up on system-call entry. See also the fork and signal handling
-	 * code how this is handled.
-	 */
-	regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) |
-		(level << X86_EFLAGS_IOPL_BIT);
-	/* Store the new level in the thread struct */
-	t->iopl = level << X86_EFLAGS_IOPL_BIT;
-	/*
-	 * X86_32 switches immediately and XEN handles it via emulation.
-	 */
-	set_iopl_mask(t->iopl);
+
+	if (IS_ENABLED(CONFIG_X86_IOPL_EMULATION)) {
+		t->iopl_emul = level;
+		task_update_io_bitmap();
+	} else {
+		/*
+		 * Change the flags value on the return stack, which has
+		 * been set up on system-call entry. See also the fork and
+		 * signal handling code how this is handled.
+		 */
+		regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) |
+			(level << X86_EFLAGS_IOPL_BIT);
+		/* Store the new level in the thread struct */
+		t->iopl = level << X86_EFLAGS_IOPL_BIT;
+		/*
+		 * X86_32 switches immediately and XEN handles it via
+		 * emulation.
+		 */
+		set_iopl_mask(t->iopl);
+	}
 
 	return 0;
 }
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 0b19c13..8a844a5 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -376,21 +376,27 @@ static void tss_copy_io_bitmap(struct tss_struct *tss, struct io_bitmap *iobm)
 void tss_update_io_bitmap(void)
 {
 	struct tss_struct *tss = this_cpu_ptr(&cpu_tss_rw);
+	u16 *base = &tss->x86_tss.io_bitmap_base;
 
 	if (test_thread_flag(TIF_IO_BITMAP)) {
-		struct io_bitmap *iobm = current->thread.io_bitmap;
-
-		/*
-		 * Only copy bitmap data when the sequence number
-		 * differs. The update time is accounted to the incoming
-		 * task.
-		 */
-		if (tss->io_bitmap.prev_sequence != iobm->sequence)
-			tss_copy_io_bitmap(tss, iobm);
-
-		/* Enable the bitmap */
-		tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET_VALID;
-
+		struct thread_struct *t = &current->thread;
+
+		if (IS_ENABLED(CONFIG_X86_IOPL_EMULATION) &&
+		    t->iopl_emul == 3) {
+			*base = IO_BITMAP_OFFSET_VALID_ALL;
+		} else {
+			struct io_bitmap *iobm = t->io_bitmap;
+			/*
+			 * Only copy bitmap data when the sequence number
+			 * differs. The update time is accounted to the
+			 * incoming task.
+			 */
+			if (tss->io_bitmap.prev_sequence != iobm->sequence)
+				tss_copy_io_bitmap(tss, iobm);
+
+			/* Enable the bitmap */
+			*base = IO_BITMAP_OFFSET_VALID_MAP;
+		}
 		/*
 		 * Make sure that the TSS limit is covering the io bitmap.
 		 * It might have been cut down by a VMEXIT to 0x67 which

^ permalink raw reply	[flat|nested] 54+ messages in thread

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Thread overview: 54+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-13 20:42 [patch V3 00/20] x86/iopl: Prevent user space from using CLI/STI with iopl(3) Thomas Gleixner
2019-11-13 20:42 ` [patch V3 01/20] x86/ptrace: Prevent truncation of bitmap size Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 02/20] x86/process: Unify copy_thread_tls() Thomas Gleixner
2019-11-13 21:10   ` Linus Torvalds
2019-11-13 21:41     ` Thomas Gleixner
2019-11-13 22:10       ` Linus Torvalds
2019-11-13 22:33         ` Thomas Gleixner
2019-11-13 21:44     ` Brian Gerst
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 03/20] x86/cpu: Unify cpu_init() Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 04/20] x86/tss: Fix and move VMX BUILD_BUG_ON() Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 05/20] x86/iopl: Cleanup include maze Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 06/20] x86/ioperm: Simplify first ioperm() invocation logic Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 07/20] x86/ioperm: Avoid bitmap allocation if no permissions are set Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 08/20] x86/io: Speedup schedule out of I/O bitmap user Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 09/20] x86/tss: Move I/O bitmap data into a seperate struct Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 10/20] x86/ioperm: Move iobitmap data into a struct Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 11/20] x86/ioperm: Add bitmap sequence number Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 12/20] x86/ioperm: Move TSS bitmap update to exit to user work Thomas Gleixner
2019-11-13 21:19   ` Linus Torvalds
2019-11-13 21:21     ` Linus Torvalds
2019-11-13 21:44       ` Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 13/20] x86/ioperm: Remove bitmap if all permissions dropped Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 14/20] x86/ioperm: Share I/O bitmap if identical Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 15/20] selftests/x86/ioperm: Extend testing so the shared bitmap is exercised Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 16/20] x86/iopl: Fixup misleading comment Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 17/20] x86/iopl: Restrict iopl() permission scope Thomas Gleixner
2019-11-14 18:13   ` Borislav Petkov
2019-11-14 18:39     ` Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 18/20] x86/iopl: Remove legacy IOPL option Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:42 ` [patch V3 19/20] x86/ioperm: Extend IOPL config to control ioperm() as well Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-13 20:43 ` [patch V3 20/20] selftests/x86/iopl: Extend test to cover IOPL emulation Thomas Gleixner
2019-11-15 21:12   ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
2019-11-14  8:43 ` [patch V3 00/20] x86/iopl: Prevent user space from using CLI/STI with iopl(3) Peter Zijlstra
2019-11-16 11:51 [tip: x86/iopl] x86/iopl: Restrict iopl() permission scope tip-bot2 for Thomas Gleixner
2019-11-24 11:02 ` Ingo Molnar

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	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git