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Groups > linux.kernel > #1344065

[PATCH 3.16.y-ckt 084/129] radix-tree: fix race in gang lookup

From Luis Henriques <luis.henriques@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.16.y-ckt 084/129] radix-tree: fix race in gang lookup
Date 2016-02-26 11:50 +0100
Message-ID <r6o89-1Sy-11@gated-at.bofh.it> (permalink)
References <r6nOO-1Jb-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

3.16.7-ckt25 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Matthew Wilcox <willy@linux.intel.com>

commit 46437f9a554fbe3e110580ca08ab703b59f2f95a upstream.

If the indirect_ptr bit is set on a slot, that indicates we need to redo
the lookup.  Introduce a new function radix_tree_iter_retry() which
forces the loop to retry the lookup by setting 'slot' to NULL and
turning the iterator back to point at the problematic entry.

This is a pretty rare problem to hit at the moment; the lookup has to
race with a grow of the radix tree from a height of 0.  The consequences
of hitting this race are that gang lookup could return a pointer to a
radix_tree_node instead of a pointer to whatever the user had inserted
in the tree.

Fixes: cebbd29e1c2f ("radix-tree: rewrite gang lookup using iterator")
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 include/linux/radix-tree.h | 16 ++++++++++++++++
 lib/radix-tree.c           | 12 ++++++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 33170dbd9db4..1a2b2276ffb3 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -370,6 +370,22 @@ void **radix_tree_next_chunk(struct radix_tree_root *root,
 			     struct radix_tree_iter *iter, unsigned flags);
 
 /**
+ * radix_tree_iter_retry - retry this chunk of the iteration
+ * @iter:	iterator state
+ *
+ * If we iterate over a tree protected only by the RCU lock, a race
+ * against deletion or creation may result in seeing a slot for which
+ * radix_tree_deref_retry() returns true.  If so, call this function
+ * and continue the iteration.
+ */
+static inline __must_check
+void **radix_tree_iter_retry(struct radix_tree_iter *iter)
+{
+	iter->next_index = iter->index;
+	return NULL;
+}
+
+/**
  * radix_tree_chunk_size - get current chunk size
  *
  * @iter:	pointer to radix tree iterator
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 3291a8e37490..b31e22ddc37c 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1014,9 +1014,13 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
 		return 0;
 
 	radix_tree_for_each_slot(slot, root, &iter, first_index) {
-		results[ret] = indirect_to_ptr(rcu_dereference_raw(*slot));
+		results[ret] = rcu_dereference_raw(*slot);
 		if (!results[ret])
 			continue;
+		if (radix_tree_is_indirect_ptr(results[ret])) {
+			slot = radix_tree_iter_retry(&iter);
+			continue;
+		}
 		if (++ret == max_items)
 			break;
 	}
@@ -1093,9 +1097,13 @@ radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
 		return 0;
 
 	radix_tree_for_each_tagged(slot, root, &iter, first_index, tag) {
-		results[ret] = indirect_to_ptr(rcu_dereference_raw(*slot));
+		results[ret] = rcu_dereference_raw(*slot);
 		if (!results[ret])
 			continue;
+		if (radix_tree_is_indirect_ptr(results[ret])) {
+			slot = radix_tree_iter_retry(&iter);
+			continue;
+		}
 		if (++ret == max_items)
 			break;
 	}

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[3.16.y-ckt stable] Linux 3.16.7-ckt25 stable review Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:30 +0100
  [PATCH 3.16.y-ckt 117/129] ARM: 8519/1: ICST: try other dividends than 1 Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:30 +0100
  [PATCH 3.16.y-ckt 107/129] klist: fix starting point removed bug in klist iterators Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 126/129] sctp: translate network order to host order when users get a hmacid Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 109/129] ALSA: timer: Fix wrong instance passed to slave callbacks Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
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  [PATCH 3.16.y-ckt 100/129] mm: replace vma_lock_anon_vma with anon_vma_lock_read/write Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 099/129] ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 122/129] sctp: allow setting SCTP_SACK_IMMEDIATELY by the application Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 115/129] workqueue: handle NUMA_NO_NODE for unbound pool_workqueue lookup Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
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  [PATCH 3.16.y-ckt 125/129] ipv6: fix a lockdep splat Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 110/129] ARM: 8517/1: ICST: avoid arithmetic overflow in icst_hz() Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 120/129] af_unix: fix struct pid memory leak Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:40 +0100
  [PATCH 3.16.y-ckt 096/129] Revert "ALSA: hda - Fix noise on Gigabyte Z170X mobo" Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:50 +0100
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  [PATCH 3.16.y-ckt 084/129] radix-tree: fix race in gang lookup Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:50 +0100
  [PATCH 3.16.y-ckt 077/129] ASoC: dpcm: fix the BE state on hw_free Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:50 +0100
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  [PATCH 3.16.y-ckt 098/129] mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:50 +0100
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  [PATCH 3.16.y-ckt 092/129] scsi_dh_rdac: always retry MODE SELECT on command lock violation Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 11:50 +0100
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  [PATCH 3.16.y-ckt 060/129] rfkill: fix rfkill_fop_read wait_event usage Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:00 +0100
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  [PATCH 3.16.y-ckt 043/129] umount: Do not allow unmounting rootfs. Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:00 +0100
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  [PATCH 3.16.y-ckt 051/129] crypto: algif_hash - Fix race condition in hash_check_key Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:00 +0100
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  [PATCH 3.16.y-ckt 064/129] crypto: algif_hash - wait for crypto_ahash_init() to complete Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:00 +0100
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  [PATCH 3.16.y-ckt 036/129] drm/vmwgfx: respect 'nomodeset' Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
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  [PATCH 3.16.y-ckt 032/129] SCSI: fix crashes in sd and sr runtime PM Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 018/129] usb: hub: do not clear BOS field during reset device Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 022/129] ALSA: seq: Fix incorrect sanity check at snd_seq_oss_synth_cleanup() Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
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  [PATCH 3.16.y-ckt 023/129] ALSA: seq: Degrade the error message for too many opens Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 040/129] powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8 Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 008/129] iw_cxgb3: Fix incorrectly returning error on success Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 028/129] virtio_pci: fix use after free on release Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 030/129] arm64: errata: Add -mpc-relative-literal-loads to build flags Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 010/129] ALSA: usb-audio: avoid freeing umidi object twice Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 029/129] ALSA: bebob: Use a signed return type for get_formation_index Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 015/129] usb: cdc-acm: handle unlinked urb in acm read callback Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 017/129] cdc-acm:exclude Samsung phone 04e8:685d Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 035/129] ALSA: dummy: Disable switching timer backend via sysfs Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
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  [PATCH 3.16.y-ckt 016/129] usb: cdc-acm: send zero packet for intel 7260 modem Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
  [PATCH 3.16.y-ckt 034/129] staging/speakup: Use tty_ldisc_ref() for paste kworker Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100
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  [PATCH 3.16.y-ckt 007/129] qeth: initialize net_device with carrier off Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100
  [PATCH 3.16.y-ckt 011/129] iio: adis_buffer: Fix out-of-bounds memory access Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100
  [PATCH 3.16.y-ckt 002/129] [media] usbvision: fix leak of usb_dev on failure paths in usbvision_probe() Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100
  [PATCH 3.16.y-ckt 003/129] [media] usbvision: fix crash on detecting device with invalid configuration Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100
  [PATCH 3.16.y-ckt 004/129] tty: Fix unsafe ldisc reference via ioctl(TIOCGETD) Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100
  [PATCH 3.16.y-ckt 006/129] ASN.1: Fix non-match detection failure on data overrun Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100
  [PATCH 3.16.y-ckt 131/131] net: phy: Avoid polling PHY with PHY_IGNORE_INTERRUPTS Luis Henriques <luis.henriques@canonical.com> - 2016-02-29 12:40 +0100
  [PATCH 3.16.y-ckt 130/131] net: phy: fix PHY_RUNNING in phy_state_machine Luis Henriques <luis.henriques@canonical.com> - 2016-02-29 12:40 +0100

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