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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; 53+ 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] 53+ messages in thread
* [tip: x86/iopl] x86/process: Unify copy_thread_tls()
@ 2019-11-16 11:51 tip-bot2 for Thomas Gleixner
  0 siblings, 0 replies; 53+ 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:     2fff071d28b54f050f62654dad4ec111b8416d8e
Gitweb:        https://git.kernel.org/tip/2fff071d28b54f050f62654dad4ec111b8416d8e
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Mon, 11 Nov 2019 23:03:16 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 16 Nov 2019 11:23:59 +01:00

x86/process: Unify copy_thread_tls()

While looking at the TSS io bitmap it turned out that any change in that
area would require identical changes to copy_thread_tls(). The 32 and 64
bit variants share sufficient code to consolidate them into a common
function to avoid duplication of upcoming modifications.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>

---
 arch/x86/include/asm/ptrace.h    |   6 ++-
 arch/x86/include/asm/switch_to.h |  10 +++-
 arch/x86/kernel/process.c        | 100 ++++++++++++++++++++++++++++++-
 arch/x86/kernel/process_32.c     |  68 +--------------------
 arch/x86/kernel/process_64.c     |  75 +-----------------------
 5 files changed, 116 insertions(+), 143 deletions(-)

diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index 332eb35..5057a8e 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -361,5 +361,11 @@ extern int do_get_thread_area(struct task_struct *p, int idx,
 extern int do_set_thread_area(struct task_struct *p, int idx,
 			      struct user_desc __user *info, int can_allocate);
 
+#ifdef CONFIG_X86_64
+# define do_set_thread_area_64(p, s, t)	do_arch_prctl_64(p, s, t)
+#else
+# define do_set_thread_area_64(p, s, t)	(0)
+#endif
+
 #endif /* !__ASSEMBLY__ */
 #endif /* _ASM_X86_PTRACE_H */
diff --git a/arch/x86/include/asm/switch_to.h b/arch/x86/include/asm/switch_to.h
index 18a4b68..0e059b7 100644
--- a/arch/x86/include/asm/switch_to.h
+++ b/arch/x86/include/asm/switch_to.h
@@ -103,7 +103,17 @@ static inline void update_task_stack(struct task_struct *task)
 	if (static_cpu_has(X86_FEATURE_XENPV))
 		load_sp0(task_top_of_stack(task));
 #endif
+}
 
+static inline void kthread_frame_init(struct inactive_task_frame *frame,
+				      unsigned long fun, unsigned long arg)
+{
+	frame->bx = fun;
+#ifdef CONFIG_X86_32
+	frame->di = arg;
+#else
+	frame->r12 = arg;
+#endif
 }
 
 #endif /* _ASM_X86_SWITCH_TO_H */
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 5e94c43..7e07f0b 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -132,6 +132,106 @@ void exit_thread(struct task_struct *tsk)
 	fpu__drop(fpu);
 }
 
+static int set_new_tls(struct task_struct *p, unsigned long tls)
+{
+	struct user_desc __user *utls = (struct user_desc __user *)tls;
+
+	if (in_ia32_syscall())
+		return do_set_thread_area(p, -1, utls, 0);
+	else
+		return do_set_thread_area_64(p, ARCH_SET_FS, tls);
+}
+
+static inline int copy_io_bitmap(struct task_struct *tsk)
+{
+	if (likely(!test_tsk_thread_flag(current, TIF_IO_BITMAP)))
+		return 0;
+
+	tsk->thread.io_bitmap_ptr = kmemdup(current->thread.io_bitmap_ptr,
+					    IO_BITMAP_BYTES, GFP_KERNEL);
+	if (!tsk->thread.io_bitmap_ptr) {
+		tsk->thread.io_bitmap_max = 0;
+		return -ENOMEM;
+	}
+	set_tsk_thread_flag(tsk, TIF_IO_BITMAP);
+	return 0;
+}
+
+static inline void free_io_bitmap(struct task_struct *tsk)
+{
+	if (tsk->thread.io_bitmap_ptr) {
+		kfree(tsk->thread.io_bitmap_ptr);
+		tsk->thread.io_bitmap_ptr = NULL;
+		tsk->thread.io_bitmap_max = 0;
+	}
+}
+
+int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
+		    unsigned long arg, struct task_struct *p, unsigned long tls)
+{
+	struct inactive_task_frame *frame;
+	struct fork_frame *fork_frame;
+	struct pt_regs *childregs;
+	int ret;
+
+	childregs = task_pt_regs(p);
+	fork_frame = container_of(childregs, struct fork_frame, regs);
+	frame = &fork_frame->frame;
+
+	frame->bp = 0;
+	frame->ret_addr = (unsigned long) ret_from_fork;
+	p->thread.sp = (unsigned long) fork_frame;
+	p->thread.io_bitmap_ptr = NULL;
+	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
+
+#ifdef CONFIG_X86_64
+	savesegment(gs, p->thread.gsindex);
+	p->thread.gsbase = p->thread.gsindex ? 0 : current->thread.gsbase;
+	savesegment(fs, p->thread.fsindex);
+	p->thread.fsbase = p->thread.fsindex ? 0 : current->thread.fsbase;
+	savesegment(es, p->thread.es);
+	savesegment(ds, p->thread.ds);
+#else
+	p->thread.sp0 = (unsigned long) (childregs + 1);
+	/*
+	 * Clear all status flags including IF and set fixed bit. 64bit
+	 * does not have this initialization as the frame does not contain
+	 * flags. The flags consistency (especially vs. AC) is there
+	 * ensured via objtool, which lacks 32bit support.
+	 */
+	frame->flags = X86_EFLAGS_FIXED;
+#endif
+
+	/* Kernel thread ? */
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		kthread_frame_init(frame, sp, arg);
+		return 0;
+	}
+
+	frame->bx = 0;
+	*childregs = *current_pt_regs();
+	childregs->ax = 0;
+	if (sp)
+		childregs->sp = sp;
+
+#ifdef CONFIG_X86_32
+	task_user_gs(p) = get_user_gs(current_pt_regs());
+#endif
+
+	ret = copy_io_bitmap(p);
+	if (ret)
+		return ret;
+
+	/* Set a new TLS for the child thread? */
+	if (clone_flags & CLONE_SETTLS) {
+		ret = set_new_tls(p, tls);
+		if (ret)
+			free_io_bitmap(p);
+	}
+	return ret;
+}
+
 void flush_thread(void)
 {
 	struct task_struct *tsk = current;
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index b8ceec4..6c7d905 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -112,74 +112,6 @@ void release_thread(struct task_struct *dead_task)
 	release_vm86_irqs(dead_task);
 }
 
-int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
-	unsigned long arg, struct task_struct *p, unsigned long tls)
-{
-	struct pt_regs *childregs = task_pt_regs(p);
-	struct fork_frame *fork_frame = container_of(childregs, struct fork_frame, regs);
-	struct inactive_task_frame *frame = &fork_frame->frame;
-	struct task_struct *tsk;
-	int err;
-
-	/*
-	 * For a new task use the RESET flags value since there is no before.
-	 * All the status flags are zero; DF and all the system flags must also
-	 * be 0, specifically IF must be 0 because we context switch to the new
-	 * task with interrupts disabled.
-	 */
-	frame->flags = X86_EFLAGS_FIXED;
-	frame->bp = 0;
-	frame->ret_addr = (unsigned long) ret_from_fork;
-	p->thread.sp = (unsigned long) fork_frame;
-	p->thread.sp0 = (unsigned long) (childregs+1);
-	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
-
-	if (unlikely(p->flags & PF_KTHREAD)) {
-		/* kernel thread */
-		memset(childregs, 0, sizeof(struct pt_regs));
-		frame->bx = sp;		/* function */
-		frame->di = arg;
-		p->thread.io_bitmap_ptr = NULL;
-		return 0;
-	}
-	frame->bx = 0;
-	*childregs = *current_pt_regs();
-	childregs->ax = 0;
-	if (sp)
-		childregs->sp = sp;
-
-	task_user_gs(p) = get_user_gs(current_pt_regs());
-
-	p->thread.io_bitmap_ptr = NULL;
-	tsk = current;
-	err = -ENOMEM;
-
-	if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
-		p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
-						IO_BITMAP_BYTES, GFP_KERNEL);
-		if (!p->thread.io_bitmap_ptr) {
-			p->thread.io_bitmap_max = 0;
-			return -ENOMEM;
-		}
-		set_tsk_thread_flag(p, TIF_IO_BITMAP);
-	}
-
-	err = 0;
-
-	/*
-	 * Set a new TLS for the child thread?
-	 */
-	if (clone_flags & CLONE_SETTLS)
-		err = do_set_thread_area(p, -1,
-			(struct user_desc __user *)tls, 0);
-
-	if (err && p->thread.io_bitmap_ptr) {
-		kfree(p->thread.io_bitmap_ptr);
-		p->thread.io_bitmap_max = 0;
-	}
-	return err;
-}
-
 void
 start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
 {
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index af64519..e93a1b8 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -371,81 +371,6 @@ void x86_gsbase_write_task(struct task_struct *task, unsigned long gsbase)
 	task->thread.gsbase = gsbase;
 }
 
-int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
-		unsigned long arg, struct task_struct *p, unsigned long tls)
-{
-	int err;
-	struct pt_regs *childregs;
-	struct fork_frame *fork_frame;
-	struct inactive_task_frame *frame;
-	struct task_struct *me = current;
-
-	childregs = task_pt_regs(p);
-	fork_frame = container_of(childregs, struct fork_frame, regs);
-	frame = &fork_frame->frame;
-
-	frame->bp = 0;
-	frame->ret_addr = (unsigned long) ret_from_fork;
-	p->thread.sp = (unsigned long) fork_frame;
-	p->thread.io_bitmap_ptr = NULL;
-
-	savesegment(gs, p->thread.gsindex);
-	p->thread.gsbase = p->thread.gsindex ? 0 : me->thread.gsbase;
-	savesegment(fs, p->thread.fsindex);
-	p->thread.fsbase = p->thread.fsindex ? 0 : me->thread.fsbase;
-	savesegment(es, p->thread.es);
-	savesegment(ds, p->thread.ds);
-	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
-
-	if (unlikely(p->flags & PF_KTHREAD)) {
-		/* kernel thread */
-		memset(childregs, 0, sizeof(struct pt_regs));
-		frame->bx = sp;		/* function */
-		frame->r12 = arg;
-		return 0;
-	}
-	frame->bx = 0;
-	*childregs = *current_pt_regs();
-
-	childregs->ax = 0;
-	if (sp)
-		childregs->sp = sp;
-
-	err = -ENOMEM;
-	if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
-		p->thread.io_bitmap_ptr = kmemdup(me->thread.io_bitmap_ptr,
-						  IO_BITMAP_BYTES, GFP_KERNEL);
-		if (!p->thread.io_bitmap_ptr) {
-			p->thread.io_bitmap_max = 0;
-			return -ENOMEM;
-		}
-		set_tsk_thread_flag(p, TIF_IO_BITMAP);
-	}
-
-	/*
-	 * Set a new TLS for the child thread?
-	 */
-	if (clone_flags & CLONE_SETTLS) {
-#ifdef CONFIG_IA32_EMULATION
-		if (in_ia32_syscall())
-			err = do_set_thread_area(p, -1,
-				(struct user_desc __user *)tls, 0);
-		else
-#endif
-			err = do_arch_prctl_64(p, ARCH_SET_FS, tls);
-		if (err)
-			goto out;
-	}
-	err = 0;
-out:
-	if (err && p->thread.io_bitmap_ptr) {
-		kfree(p->thread.io_bitmap_ptr);
-		p->thread.io_bitmap_max = 0;
-	}
-
-	return err;
-}
-
 static void
 start_thread_common(struct pt_regs *regs, unsigned long new_ip,
 		    unsigned long new_sp,

^ permalink raw reply	[flat|nested] 53+ messages in thread

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Thread overview: 53+ 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/process: Unify copy_thread_tls() tip-bot2 for Thomas Gleixner

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	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