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Groups > linux.kernel > #1467121
| From | Willy Tarreau <w@1wt.eu> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.10 037/180] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization |
| Date | 2016-08-21 18:00 +0200 |
| Message-ID | <s8Dkf-2ft-69@gated-at.bofh.it> (permalink) |
| References | <s8D0R-26R-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Andy Lutomirski <luto@kernel.org>
commit 71b3c126e61177eb693423f2e18a1914205b165e upstream.
When switch_mm() activates a new PGD, it also sets a bit that
tells other CPUs that the PGD is in use so that TLB flush IPIs
will be sent. In order for that to work correctly, the bit
needs to be visible prior to loading the PGD and therefore
starting to fill the local TLB.
Document all the barriers that make this work correctly and add
a couple that were missing.
CVE-2016-2069
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
[ luis: backported to 3.16:
- dropped N/A comment in flush_tlb_mm_range()
- adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
[ciwillia@brocade.com: backported to 3.10: adjusted context]
Signed-off-by: Charles (Chas) Williams <ciwillia@brocade.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
arch/x86/include/asm/mmu_context.h | 32 +++++++++++++++++++++++++++++++-
arch/x86/mm/tlb.c | 24 +++++++++++++++++++++---
2 files changed, 52 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index be12c53..c0d2f6b 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -42,7 +42,32 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
#endif
cpumask_set_cpu(cpu, mm_cpumask(next));
- /* Re-load page tables */
+ /*
+ * Re-load page tables.
+ *
+ * This logic has an ordering constraint:
+ *
+ * CPU 0: Write to a PTE for 'next'
+ * CPU 0: load bit 1 in mm_cpumask. if nonzero, send IPI.
+ * CPU 1: set bit 1 in next's mm_cpumask
+ * CPU 1: load from the PTE that CPU 0 writes (implicit)
+ *
+ * We need to prevent an outcome in which CPU 1 observes
+ * the new PTE value and CPU 0 observes bit 1 clear in
+ * mm_cpumask. (If that occurs, then the IPI will never
+ * be sent, and CPU 0's TLB will contain a stale entry.)
+ *
+ * The bad outcome can occur if either CPU's load is
+ * reordered before that CPU's store, so both CPUs much
+ * execute full barriers to prevent this from happening.
+ *
+ * Thus, switch_mm needs a full barrier between the
+ * store to mm_cpumask and any operation that could load
+ * from next->pgd. This barrier synchronizes with
+ * remote TLB flushers. Fortunately, load_cr3 is
+ * serializing and thus acts as a full barrier.
+ *
+ */
load_cr3(next->pgd);
/* Stop flush ipis for the previous mm */
@@ -65,10 +90,15 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* schedule, protecting us from simultaneous changes.
*/
cpumask_set_cpu(cpu, mm_cpumask(next));
+
/*
* We were in lazy tlb mode and leave_mm disabled
* tlb flush IPI delivery. We must reload CR3
* to make sure to use no freed page tables.
+ *
+ * As above, this is a barrier that forces
+ * TLB repopulation to be ordered after the
+ * store to mm_cpumask.
*/
load_cr3(next->pgd);
load_LDT_nolock(&next->context);
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 282375f..c26b610 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -149,7 +149,9 @@ void flush_tlb_current_task(void)
preempt_disable();
+ /* This is an implicit full barrier that synchronizes with switch_mm. */
local_flush_tlb();
+
if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
preempt_enable();
@@ -188,11 +190,19 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned act_entries, tlb_entries = 0;
preempt_disable();
- if (current->active_mm != mm)
+ if (current->active_mm != mm) {
+ /* Synchronize with switch_mm. */
+ smp_mb();
+
goto flush_all;
+ }
if (!current->mm) {
leave_mm(smp_processor_id());
+
+ /* Synchronize with switch_mm. */
+ smp_mb();
+
goto flush_all;
}
@@ -242,10 +252,18 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long start)
preempt_disable();
if (current->active_mm == mm) {
- if (current->mm)
+ if (current->mm) {
+ /*
+ * Implicit full barrier (INVLPG) that synchronizes
+ * with switch_mm.
+ */
__flush_tlb_one(start);
- else
+ } else {
leave_mm(smp_processor_id());
+
+ /* Synchronize with switch_mm. */
+ smp_mb();
+ }
}
if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
--
2.8.0.rc2.1.gbe9624a
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[PATCH 3.10 147/180] mmc: block: fix packed command header endianness Willy Tarreau <w@1wt.eu> - 2016-08-21 18:00 +0200
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[PATCH 3.10 142/180] xen/pciback: Fix conf_space read/write overlap check. Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 090/180] xfs: xfs_iflush_cluster fails to abort on error Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
Re: [PATCH 3.10 090/180] xfs: xfs_iflush_cluster fails to abort on error Dave Chinner <david@fromorbit.com> - 2016-08-22 06:30 +0200
Re: [PATCH 3.10 090/180] xfs: xfs_iflush_cluster fails to abort on error Willy Tarreau <w@1wt.eu> - 2016-08-22 07:20 +0200
Re: [PATCH 3.10 090/180] xfs: xfs_iflush_cluster fails to abort on error Willy Tarreau <w@1wt.eu> - 2016-08-22 07:30 +0200
Re: [PATCH 3.10 090/180] xfs: xfs_iflush_cluster fails to abort on error Dave Chinner <dchinner@redhat.com> - 2016-08-22 13:00 +0200
Re: [PATCH 3.10 090/180] xfs: xfs_iflush_cluster fails to abort on error Willy Tarreau <w@1wt.eu> - 2016-08-22 13:10 +0200
[PATCH 3.10 003/180] netfilter: x_tables: validate e->target_offset early Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 025/180] perf/x86: Fix undefined shift on 32-bit kernels Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 164/180] cifs: Check for existing directory when opening file with O_CREAT Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 091/180] xfs: fix inode validity check in xfs_iflush_cluster Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 038/180] pipe: limit the per-user amount of pages allocated in pipes Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 118/180] UBIFS: Implement ->migratepage() Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 175/180] HID: hid-input: Add parentheses to quell gcc warning Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 065/180] PCI: Disable all BAR sizing for devices with non-compliant BARs Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 144/180] ecryptfs: don't allow mmap when the lower fs doesn't support it Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 043/180] HID: hiddev: validate num_values for HIDIOCGUSAGES, HIDIOCSUSAGES commands Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 067/180] powerpc/book3s64: Fix branching to OOL handlers in relocatable kernel Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 157/180] fuse: fix wrong assignment of ->flags in fuse_send_init() Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 023/180] netfilter: x_tables: introduce and use xt_copy_counters_from_user Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 011/180] netfilter: x_tables: add compat version of xt_check_entry_offsets Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 122/180] base: make module_create_drivers_dir race-free Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 087/180] ext4: short-cut orphan cleanup on error Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 125/180] iio: accel: kxsd9: fix the usage of spi_w8r8() Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
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[PATCH 3.10 107/180] mac80211: mesh: flush mesh paths unconditionally Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 138/180] xen/acpi: allow xen-acpi-processor driver to load on Xen 4.7 Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 119/180] cdc_ncm: workaround for EM7455 "silent" data interface Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 106/180] net: alx: Work around the DMA RX overflow issue Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 032/180] USB: EHCI: declare hostpc register as zero-length array Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 031/180] USB: fix up faulty backports Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 150/180] ipr: Clear interrupt on croc/crocodile when running with LSI Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 041/180] mm: migrate dirty page without clear_page_dirty_for_io etc Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 116/180] NFS: Fix another OPEN_DOWNGRADE bug Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 069/180] powerpc: Use privileged SPR number for MMCR2 Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 085/180] ext4: check for extents that wrap around Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 072/180] powerpc/pseries: Fix PCI config address for DDW Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 110/180] IB/security: Restrict use of the write() interface Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 133/180] ALSA: timer: Fix leak in events via snd_timer_user_ccallback Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 123/180] iio: Fix error handling in iio_trigger_attach_poll_func Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 172/180] module: Invalidate signatures on force-loaded modules Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 160/180] hp-wmi: Fix wifi cannot be hard-unblocked Willy Tarreau <w@1wt.eu> - 2016-08-21 18:10 +0200
[PATCH 3.10 004/180] netfilter: x_tables: make sure e->next_offset covers remaining blob size Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 042/180] printk: do cond_resched() between lines while outputting to consoles Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 001/180] X.509: remove possible code fragility: enumeration values not handled Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 097/180] ecryptfs: forbid opening files without mmap handler Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 021/180] netfilter: x_tables: do compat validation via translate_table Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 030/180] USB: usbfs: fix potential infoleak in devio Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 040/180] KEYS: potential uninitialized variable Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 034/180] usb: musb: Stop bulk endpoint while queue is rotated Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 005/180] netfilter: x_tables: fix unconditional helper Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 014/180] netfilter: x_tables: validate all offsets and sizes in a rule Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
[PATCH 3.10 022/180] Revert "netfilter: ensure number of counters is >0 in do_replace()" Willy Tarreau <w@1wt.eu> - 2016-08-21 18:20 +0200
csiph-web