From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Vishnu Dasa <vdasa@vmware.com>,
Adit Ranadive <aditr@vmware.com>,
Jorgen Hansen <jhansen@vmware.com>
Subject: [PATCH 5.2 52/61] VMCI: Fix integer overflow in VMCI handle arrays
Date: Fri, 12 Jul 2019 14:20:05 +0200 [thread overview]
Message-ID: <20190712121623.506839436@linuxfoundation.org> (raw)
In-Reply-To: <20190712121620.632595223@linuxfoundation.org>
From: Vishnu DASA <vdasa@vmware.com>
commit 1c2eb5b2853c9f513690ba6b71072d8eb65da16a upstream.
The VMCI handle array has an integer overflow in
vmci_handle_arr_append_entry when it tries to expand the array. This can be
triggered from a guest, since the doorbell link hypercall doesn't impose a
limit on the number of doorbell handles that a VM can create in the
hypervisor, and these handles are stored in a handle array.
In this change, we introduce a mandatory max capacity for handle
arrays/lists to avoid excessive memory usage.
Signed-off-by: Vishnu Dasa <vdasa@vmware.com>
Reviewed-by: Adit Ranadive <aditr@vmware.com>
Reviewed-by: Jorgen Hansen <jhansen@vmware.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/misc/vmw_vmci/vmci_context.c | 80 ++++++++++++++++--------------
drivers/misc/vmw_vmci/vmci_handle_array.c | 38 +++++++++-----
drivers/misc/vmw_vmci/vmci_handle_array.h | 29 +++++++---
include/linux/vmw_vmci_defs.h | 11 +++-
4 files changed, 99 insertions(+), 59 deletions(-)
--- a/drivers/misc/vmw_vmci/vmci_context.c
+++ b/drivers/misc/vmw_vmci/vmci_context.c
@@ -21,6 +21,9 @@
#include "vmci_driver.h"
#include "vmci_event.h"
+/* Use a wide upper bound for the maximum contexts. */
+#define VMCI_MAX_CONTEXTS 2000
+
/*
* List of current VMCI contexts. Contexts can be added by
* vmci_ctx_create() and removed via vmci_ctx_destroy().
@@ -117,19 +120,22 @@ struct vmci_ctx *vmci_ctx_create(u32 cid
/* Initialize host-specific VMCI context. */
init_waitqueue_head(&context->host_context.wait_queue);
- context->queue_pair_array = vmci_handle_arr_create(0);
+ context->queue_pair_array =
+ vmci_handle_arr_create(0, VMCI_MAX_GUEST_QP_COUNT);
if (!context->queue_pair_array) {
error = -ENOMEM;
goto err_free_ctx;
}
- context->doorbell_array = vmci_handle_arr_create(0);
+ context->doorbell_array =
+ vmci_handle_arr_create(0, VMCI_MAX_GUEST_DOORBELL_COUNT);
if (!context->doorbell_array) {
error = -ENOMEM;
goto err_free_qp_array;
}
- context->pending_doorbell_array = vmci_handle_arr_create(0);
+ context->pending_doorbell_array =
+ vmci_handle_arr_create(0, VMCI_MAX_GUEST_DOORBELL_COUNT);
if (!context->pending_doorbell_array) {
error = -ENOMEM;
goto err_free_db_array;
@@ -204,7 +210,7 @@ static int ctx_fire_notification(u32 con
* We create an array to hold the subscribers we find when
* scanning through all contexts.
*/
- subscriber_array = vmci_handle_arr_create(0);
+ subscriber_array = vmci_handle_arr_create(0, VMCI_MAX_CONTEXTS);
if (subscriber_array == NULL)
return VMCI_ERROR_NO_MEM;
@@ -623,20 +629,26 @@ int vmci_ctx_add_notification(u32 contex
spin_lock(&context->lock);
- list_for_each_entry(n, &context->notifier_list, node) {
- if (vmci_handle_is_equal(n->handle, notifier->handle)) {
- exists = true;
- break;
+ if (context->n_notifiers < VMCI_MAX_CONTEXTS) {
+ list_for_each_entry(n, &context->notifier_list, node) {
+ if (vmci_handle_is_equal(n->handle, notifier->handle)) {
+ exists = true;
+ break;
+ }
}
- }
- if (exists) {
- kfree(notifier);
- result = VMCI_ERROR_ALREADY_EXISTS;
+ if (exists) {
+ kfree(notifier);
+ result = VMCI_ERROR_ALREADY_EXISTS;
+ } else {
+ list_add_tail_rcu(¬ifier->node,
+ &context->notifier_list);
+ context->n_notifiers++;
+ result = VMCI_SUCCESS;
+ }
} else {
- list_add_tail_rcu(¬ifier->node, &context->notifier_list);
- context->n_notifiers++;
- result = VMCI_SUCCESS;
+ kfree(notifier);
+ result = VMCI_ERROR_NO_MEM;
}
spin_unlock(&context->lock);
@@ -721,8 +733,7 @@ static int vmci_ctx_get_chkpt_doorbells(
u32 *buf_size, void **pbuf)
{
struct dbell_cpt_state *dbells;
- size_t n_doorbells;
- int i;
+ u32 i, n_doorbells;
n_doorbells = vmci_handle_arr_get_size(context->doorbell_array);
if (n_doorbells > 0) {
@@ -860,7 +871,8 @@ int vmci_ctx_rcv_notifications_get(u32 c
spin_lock(&context->lock);
*db_handle_array = context->pending_doorbell_array;
- context->pending_doorbell_array = vmci_handle_arr_create(0);
+ context->pending_doorbell_array =
+ vmci_handle_arr_create(0, VMCI_MAX_GUEST_DOORBELL_COUNT);
if (!context->pending_doorbell_array) {
context->pending_doorbell_array = *db_handle_array;
*db_handle_array = NULL;
@@ -942,12 +954,11 @@ int vmci_ctx_dbell_create(u32 context_id
return VMCI_ERROR_NOT_FOUND;
spin_lock(&context->lock);
- if (!vmci_handle_arr_has_entry(context->doorbell_array, handle)) {
- vmci_handle_arr_append_entry(&context->doorbell_array, handle);
- result = VMCI_SUCCESS;
- } else {
+ if (!vmci_handle_arr_has_entry(context->doorbell_array, handle))
+ result = vmci_handle_arr_append_entry(&context->doorbell_array,
+ handle);
+ else
result = VMCI_ERROR_DUPLICATE_ENTRY;
- }
spin_unlock(&context->lock);
vmci_ctx_put(context);
@@ -1083,15 +1094,16 @@ int vmci_ctx_notify_dbell(u32 src_cid,
if (!vmci_handle_arr_has_entry(
dst_context->pending_doorbell_array,
handle)) {
- vmci_handle_arr_append_entry(
+ result = vmci_handle_arr_append_entry(
&dst_context->pending_doorbell_array,
handle);
-
- ctx_signal_notify(dst_context);
- wake_up(&dst_context->host_context.wait_queue);
-
+ if (result == VMCI_SUCCESS) {
+ ctx_signal_notify(dst_context);
+ wake_up(&dst_context->host_context.wait_queue);
+ }
+ } else {
+ result = VMCI_SUCCESS;
}
- result = VMCI_SUCCESS;
}
spin_unlock(&dst_context->lock);
}
@@ -1118,13 +1130,11 @@ int vmci_ctx_qp_create(struct vmci_ctx *
if (context == NULL || vmci_handle_is_invalid(handle))
return VMCI_ERROR_INVALID_ARGS;
- if (!vmci_handle_arr_has_entry(context->queue_pair_array, handle)) {
- vmci_handle_arr_append_entry(&context->queue_pair_array,
- handle);
- result = VMCI_SUCCESS;
- } else {
+ if (!vmci_handle_arr_has_entry(context->queue_pair_array, handle))
+ result = vmci_handle_arr_append_entry(
+ &context->queue_pair_array, handle);
+ else
result = VMCI_ERROR_DUPLICATE_ENTRY;
- }
return result;
}
--- a/drivers/misc/vmw_vmci/vmci_handle_array.c
+++ b/drivers/misc/vmw_vmci/vmci_handle_array.c
@@ -8,24 +8,29 @@
#include <linux/slab.h>
#include "vmci_handle_array.h"
-static size_t handle_arr_calc_size(size_t capacity)
+static size_t handle_arr_calc_size(u32 capacity)
{
- return sizeof(struct vmci_handle_arr) +
+ return VMCI_HANDLE_ARRAY_HEADER_SIZE +
capacity * sizeof(struct vmci_handle);
}
-struct vmci_handle_arr *vmci_handle_arr_create(size_t capacity)
+struct vmci_handle_arr *vmci_handle_arr_create(u32 capacity, u32 max_capacity)
{
struct vmci_handle_arr *array;
+ if (max_capacity == 0 || capacity > max_capacity)
+ return NULL;
+
if (capacity == 0)
- capacity = VMCI_HANDLE_ARRAY_DEFAULT_SIZE;
+ capacity = min((u32)VMCI_HANDLE_ARRAY_DEFAULT_CAPACITY,
+ max_capacity);
array = kmalloc(handle_arr_calc_size(capacity), GFP_ATOMIC);
if (!array)
return NULL;
array->capacity = capacity;
+ array->max_capacity = max_capacity;
array->size = 0;
return array;
@@ -36,27 +41,34 @@ void vmci_handle_arr_destroy(struct vmci
kfree(array);
}
-void vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
- struct vmci_handle handle)
+int vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
+ struct vmci_handle handle)
{
struct vmci_handle_arr *array = *array_ptr;
if (unlikely(array->size >= array->capacity)) {
/* reallocate. */
struct vmci_handle_arr *new_array;
- size_t new_capacity = array->capacity * VMCI_ARR_CAP_MULT;
- size_t new_size = handle_arr_calc_size(new_capacity);
+ u32 capacity_bump = min(array->max_capacity - array->capacity,
+ array->capacity);
+ size_t new_size = handle_arr_calc_size(array->capacity +
+ capacity_bump);
+
+ if (array->size >= array->max_capacity)
+ return VMCI_ERROR_NO_MEM;
new_array = krealloc(array, new_size, GFP_ATOMIC);
if (!new_array)
- return;
+ return VMCI_ERROR_NO_MEM;
- new_array->capacity = new_capacity;
+ new_array->capacity += capacity_bump;
*array_ptr = array = new_array;
}
array->entries[array->size] = handle;
array->size++;
+
+ return VMCI_SUCCESS;
}
/*
@@ -66,7 +78,7 @@ struct vmci_handle vmci_handle_arr_remov
struct vmci_handle entry_handle)
{
struct vmci_handle handle = VMCI_INVALID_HANDLE;
- size_t i;
+ u32 i;
for (i = 0; i < array->size; i++) {
if (vmci_handle_is_equal(array->entries[i], entry_handle)) {
@@ -101,7 +113,7 @@ struct vmci_handle vmci_handle_arr_remov
* Handle at given index, VMCI_INVALID_HANDLE if invalid index.
*/
struct vmci_handle
-vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, size_t index)
+vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, u32 index)
{
if (unlikely(index >= array->size))
return VMCI_INVALID_HANDLE;
@@ -112,7 +124,7 @@ vmci_handle_arr_get_entry(const struct v
bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
struct vmci_handle entry_handle)
{
- size_t i;
+ u32 i;
for (i = 0; i < array->size; i++)
if (vmci_handle_is_equal(array->entries[i], entry_handle))
--- a/drivers/misc/vmw_vmci/vmci_handle_array.h
+++ b/drivers/misc/vmw_vmci/vmci_handle_array.h
@@ -9,32 +9,41 @@
#define _VMCI_HANDLE_ARRAY_H_
#include <linux/vmw_vmci_defs.h>
+#include <linux/limits.h>
#include <linux/types.h>
-#define VMCI_HANDLE_ARRAY_DEFAULT_SIZE 4
-#define VMCI_ARR_CAP_MULT 2 /* Array capacity multiplier */
-
struct vmci_handle_arr {
- size_t capacity;
- size_t size;
+ u32 capacity;
+ u32 max_capacity;
+ u32 size;
+ u32 pad;
struct vmci_handle entries[];
};
-struct vmci_handle_arr *vmci_handle_arr_create(size_t capacity);
+#define VMCI_HANDLE_ARRAY_HEADER_SIZE \
+ offsetof(struct vmci_handle_arr, entries)
+/* Select a default capacity that results in a 64 byte sized array */
+#define VMCI_HANDLE_ARRAY_DEFAULT_CAPACITY 6
+/* Make sure that the max array size can be expressed by a u32 */
+#define VMCI_HANDLE_ARRAY_MAX_CAPACITY \
+ ((U32_MAX - VMCI_HANDLE_ARRAY_HEADER_SIZE - 1) / \
+ sizeof(struct vmci_handle))
+
+struct vmci_handle_arr *vmci_handle_arr_create(u32 capacity, u32 max_capacity);
void vmci_handle_arr_destroy(struct vmci_handle_arr *array);
-void vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
- struct vmci_handle handle);
+int vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,
+ struct vmci_handle handle);
struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,
struct vmci_handle
entry_handle);
struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array);
struct vmci_handle
-vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, size_t index);
+vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, u32 index);
bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
struct vmci_handle entry_handle);
struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array);
-static inline size_t vmci_handle_arr_get_size(
+static inline u32 vmci_handle_arr_get_size(
const struct vmci_handle_arr *array)
{
return array->size;
--- a/include/linux/vmw_vmci_defs.h
+++ b/include/linux/vmw_vmci_defs.h
@@ -62,9 +62,18 @@ enum {
/*
* A single VMCI device has an upper limit of 128MB on the amount of
- * memory that can be used for queue pairs.
+ * memory that can be used for queue pairs. Since each queue pair
+ * consists of at least two pages, the memory limit also dictates the
+ * number of queue pairs a guest can create.
*/
#define VMCI_MAX_GUEST_QP_MEMORY (128 * 1024 * 1024)
+#define VMCI_MAX_GUEST_QP_COUNT (VMCI_MAX_GUEST_QP_MEMORY / PAGE_SIZE / 2)
+
+/*
+ * There can be at most PAGE_SIZE doorbells since there is one doorbell
+ * per byte in the doorbell bitmap page.
+ */
+#define VMCI_MAX_GUEST_DOORBELL_COUNT PAGE_SIZE
/*
* Queues with pre-mapped data pages must be small, so that we don't pin
next prev parent reply other threads:[~2019-07-12 12:35 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 12:19 [PATCH 5.2 00/61] 5.2.1-stable review Greg Kroah-Hartman
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2019-07-12 12:19 ` [PATCH 5.2 16/61] perf pmu: Fix uncore PMU alias list for ARM64 Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 17/61] perf thread-stack: Fix thread stack return from kernel for kernel-only case Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 18/61] perf header: Assign proper ff->ph in perf_event__synthesize_features() Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 19/61] x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg() Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 20/61] x86/tls: Fix possible spectre-v1 in do_get_thread_area() Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 21/61] Documentation: Add section about CPU vulnerabilities for Spectre Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 22/61] Documentation/admin: Remove the vsyscall=native documentation Greg Kroah-Hartman
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2019-07-12 12:19 ` [PATCH 5.2 27/61] p54usb: Fix race between disconnect and firmware loading Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 28/61] usb: gadget: f_fs: data_len used before properly set Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 29/61] usb: gadget: ether: Fix race between gether_disconnect and rx_submit Greg Kroah-Hartman
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2019-07-12 12:19 ` [PATCH 5.2 31/61] usb: renesas_usbhs: add a workaround for a race condition of workqueue Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 32/61] drivers/usb/typec/tps6598x.c: fix portinfo width Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 33/61] drivers/usb/typec/tps6598x.c: fix 4CC cmd write Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 34/61] p54: fix crash during initialization Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 35/61] staging: comedi: dt282x: fix a null pointer deref on interrupt Greg Kroah-Hartman
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2019-07-12 12:19 ` [PATCH 5.2 37/61] staging: bcm2835-camera: Restore return behavior of ctrl_set_bitrate() Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 38/61] staging: comedi: amplc_pci230: fix null pointer deref on interrupt Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 39/61] staging: mt7621-pci: fix PCIE_FTS_NUM_LO macro Greg Kroah-Hartman
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2019-07-12 12:19 ` [PATCH 5.2 41/61] lkdtm: support llvm-objcopy Greg Kroah-Hartman
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2019-07-12 12:19 ` [PATCH 5.2 43/61] binder: return errors from buffer copy functions Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 44/61] iio: adc: stm32-adc: add missing vdda-supply Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 45/61] coresight: Potential uninitialized variable in probe() Greg Kroah-Hartman
2019-07-12 12:19 ` [PATCH 5.2 46/61] coresight: etb10: Do not call smp_processor_id from preemptible Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 47/61] coresight: tmc-etr: Do not call smp_processor_id() " Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 48/61] coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id " Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 49/61] coresight: tmc-etf: " Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 50/61] carl9170: fix misuse of device driver API Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 51/61] Revert "x86/build: Move _etext to actual end of .text" Greg Kroah-Hartman
2019-07-12 12:20 ` Greg Kroah-Hartman [this message]
2019-07-12 12:20 ` [PATCH 5.2 53/61] staging: vchiq_2835_arm: revert "quit using custom down_interruptible()" Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 54/61] staging: vchiq: make wait events interruptible Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 55/61] staging: vchiq: revert "switch to wait_for_completion_killable" Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 56/61] staging: fsl-dpaa2/ethsw: fix memory leak of switchdev_work Greg Kroah-Hartman
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2019-07-12 12:20 ` [PATCH 5.2 58/61] staging: bcm2835-camera: Ensure all buffers are returned on disable Greg Kroah-Hartman
2019-07-12 12:20 ` [PATCH 5.2 59/61] staging: bcm2835-camera: Remove check of the number of buffers supplied Greg Kroah-Hartman
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2019-07-12 13:36 ` [PATCH 5.2 00/61] 5.2.1-stable review Jon Hunter
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2019-07-12 16:10 ` Jon Hunter
2019-07-12 16:51 ` Greg Kroah-Hartman
2019-07-12 17:00 ` Major Hayden
2019-07-12 17:17 ` Dan Rue
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2019-07-13 8:23 ` Greg Kroah-Hartman
2019-07-13 3:04 ` Naresh Kamboju
2019-07-13 14:32 ` Greg Kroah-Hartman
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2019-07-13 15:21 ` Greg Kroah-Hartman
2019-07-13 20:37 ` Luke Nowakowski-Krijger
2019-07-14 6:02 ` Greg Kroah-Hartman
2019-07-13 22:04 ` Guenter Roeck
2019-07-14 6:02 ` Greg Kroah-Hartman
2019-07-14 5:35 ` Kelsey Skunberg
2019-07-14 6:02 ` Greg Kroah-Hartman
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as well as URLs for NNTP newsgroup(s).