Patchwork [3.5.y.z,extended,stable] Patch "idr: fix top layer handling" has been added to staging queue

login
register
mail settings
Submitter Luis Henriques
Date March 4, 2013, 8:49 p.m.
Message ID <1362430174-23017-1-git-send-email-luis.henriques@canonical.com>
Download mbox | patch
Permalink /patch/224817/
State New
Headers show

Comments

Luis Henriques - March 4, 2013, 8:49 p.m.
This is a note to let you know that I have just added a patch titled

    idr: fix top layer handling

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

From 269aab69afef27d3aefc20b916cbd375c49291ea Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Wed, 27 Feb 2013 17:05:02 -0800
Subject: [PATCH] idr: fix top layer handling

commit 326cf0f0f308933c10236280a322031f0097205d upstream.

Most functions in idr fail to deal with the high bits when the idr
tree grows to the maximum height.

* idr_get_empty_slot() stops growing idr tree once the depth reaches
  MAX_IDR_LEVEL - 1, which is one depth shallower than necessary to
  cover the whole range.  The function doesn't even notice that it
  didn't grow the tree enough and ends up allocating the wrong ID
  given sufficiently high @starting_id.

  For example, on 64 bit, if the starting id is 0x7fffff01,
  idr_get_empty_slot() will grow the tree 5 layer deep, which only
  covers the 30 bits and then proceed to allocate as if the bit 30
  wasn't specified.  It ends up allocating 0x3fffff01 without the bit
  30 but still returns 0x7fffff01.

* __idr_remove_all() will not remove anything if the tree is fully
  grown.

* idr_find() can't find anything if the tree is fully grown.

* idr_for_each() and idr_get_next() can't iterate anything if the tree
  is fully grown.

Fix it by introducing idr_max() which returns the maximum possible ID
given the depth of tree and replacing the id limit checks in all
affected places.

As the idr_layer pointer array pa[] needs to be 1 larger than the
maximum depth, enlarge pa[] arrays by one.

While this plugs the discovered issues, the whole code base is
horrible and in desparate need of rewrite.  It's fragile like hell,

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2:
 - Adjust context
 - s/MAX_IDR_LEVEL/MAX_LEVEL/; s/MAX_IDR_SHIFT/MAX_ID_SHIFT/
 - Drop change to idr_alloc()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 lib/idr.c | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

--
1.8.1.2

Patch

diff --git a/lib/idr.c b/lib/idr.c
index e90d2d0..f402f14 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -39,6 +39,14 @@ 
 static struct kmem_cache *idr_layer_cache;
 static DEFINE_SPINLOCK(simple_ida_lock);

+/* the maximum ID which can be allocated given idr->layers */
+static int idr_max(int layers)
+{
+	int bits = min_t(int, layers * IDR_BITS, MAX_ID_SHIFT);
+
+	return (1 << bits) - 1;
+}
+
 static struct idr_layer *get_from_free_list(struct idr *idp)
 {
 	struct idr_layer *p;
@@ -223,7 +231,7 @@  build_up:
 	 * Add a new layer to the top of the tree if the requested
 	 * id is larger than the currently allocated space.
 	 */
-	while ((layers < (MAX_LEVEL - 1)) && (id >= (1 << (layers*IDR_BITS)))) {
+	while (id > idr_max(layers)) {
 		layers++;
 		if (!p->count) {
 			/* special case: if the tree is currently empty,
@@ -265,7 +273,7 @@  build_up:

 static int idr_get_new_above_int(struct idr *idp, void *ptr, int starting_id)
 {
-	struct idr_layer *pa[MAX_LEVEL];
+	struct idr_layer *pa[MAX_LEVEL + 1];
 	int id;

 	id = idr_get_empty_slot(idp, starting_id, pa);
@@ -357,7 +365,7 @@  static void idr_remove_warning(int id)
 static void sub_remove(struct idr *idp, int shift, int id)
 {
 	struct idr_layer *p = idp->top;
-	struct idr_layer **pa[MAX_LEVEL];
+	struct idr_layer **pa[MAX_LEVEL + 1];
 	struct idr_layer ***paa = &pa[0];
 	struct idr_layer *to_free;
 	int n;
@@ -451,16 +459,16 @@  void idr_remove_all(struct idr *idp)
 	int n, id, max;
 	int bt_mask;
 	struct idr_layer *p;
-	struct idr_layer *pa[MAX_LEVEL];
+	struct idr_layer *pa[MAX_LEVEL + 1];
 	struct idr_layer **paa = &pa[0];

 	n = idp->layers * IDR_BITS;
 	p = idp->top;
 	rcu_assign_pointer(idp->top, NULL);
-	max = 1 << n;
+	max = idr_max(idp->layers);

 	id = 0;
-	while (id < max) {
+	while (id >= 0 && id <= max) {
 		while (n > IDR_BITS && p) {
 			n -= IDR_BITS;
 			*paa++ = p;
@@ -519,7 +527,7 @@  void *idr_find(struct idr *idp, int id)
 	/* Mask off upper bits we don't use for the search. */
 	id &= MAX_ID_MASK;

-	if (id >= (1 << n))
+	if (id > idr_max(p->layer + 1))
 		return NULL;
 	BUG_ON(n == 0);

@@ -555,15 +563,15 @@  int idr_for_each(struct idr *idp,
 {
 	int n, id, max, error = 0;
 	struct idr_layer *p;
-	struct idr_layer *pa[MAX_LEVEL];
+	struct idr_layer *pa[MAX_LEVEL + 1];
 	struct idr_layer **paa = &pa[0];

 	n = idp->layers * IDR_BITS;
 	p = rcu_dereference_raw(idp->top);
-	max = 1 << n;
+	max = idr_max(idp->layers);

 	id = 0;
-	while (id < max) {
+	while (id >= 0 && id <= max) {
 		while (n > 0 && p) {
 			n -= IDR_BITS;
 			*paa++ = p;
@@ -601,7 +609,7 @@  EXPORT_SYMBOL(idr_for_each);
  */
 void *idr_get_next(struct idr *idp, int *nextidp)
 {
-	struct idr_layer *p, *pa[MAX_LEVEL];
+	struct idr_layer *p, *pa[MAX_LEVEL + 1];
 	struct idr_layer **paa = &pa[0];
 	int id = *nextidp;
 	int n, max;
@@ -611,9 +619,9 @@  void *idr_get_next(struct idr *idp, int *nextidp)
 	if (!p)
 		return NULL;
 	n = (p->layer + 1) * IDR_BITS;
-	max = 1 << n;
+	max = idr_max(p->layer + 1);

-	while (id < max) {
+	while (id >= 0 && id <= max) {
 		while (n > 0 && p) {
 			n -= IDR_BITS;
 			*paa++ = p;
@@ -787,7 +795,7 @@  EXPORT_SYMBOL(ida_pre_get);
  */
 int ida_get_new_above(struct ida *ida, int starting_id, int *p_id)
 {
-	struct idr_layer *pa[MAX_LEVEL];
+	struct idr_layer *pa[MAX_LEVEL + 1];
 	struct ida_bitmap *bitmap;
 	unsigned long flags;
 	int idr_id = starting_id / IDA_BITMAP_BITS;