* [PATCH 5.15] Backport the fix for CVE-2024-23851 to v5.15
@ 2024-02-20 23:43 He Gao
2024-02-20 23:43 ` [PATCH 5.15] dm: limit the number of targets and parameter size area He Gao
0 siblings, 1 reply; 2+ messages in thread
From: He Gao @ 2024-02-20 23:43 UTC (permalink / raw
To: stable; +Cc: He Gao
This is the fix of CVE-2024-23851 for kernel v5.15.
Upstream commit: https://github.com/torvalds/linux/commit/bd504bcfec41a503b32054da5472904b404341a4
Changed code not affected by the patch for the old version.
He Gao (1):
dm: limit the number of targets and parameter size area
drivers/md/dm-core.h | 2 ++
drivers/md/dm-ioctl.c | 3 ++-
drivers/md/dm-table.c | 9 +++++++--
3 files changed, 11 insertions(+), 3 deletions(-)
--
2.44.0.rc0.258.g7320e95886-goog
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH 5.15] dm: limit the number of targets and parameter size area
2024-02-20 23:43 [PATCH 5.15] Backport the fix for CVE-2024-23851 to v5.15 He Gao
@ 2024-02-20 23:43 ` He Gao
0 siblings, 0 replies; 2+ messages in thread
From: He Gao @ 2024-02-20 23:43 UTC (permalink / raw
To: stable; +Cc: He Gao, Mikulas Patocka, Mike Snitzer
[ Upstream commit bd504bcfec41a503b32054da5472904b404341a4 ]
The kvmalloc function fails with a warning if the size is larger than
INT_MAX. The warning was triggered by a syscall testing robot.
In order to avoid the warning, this commit limits the number of targets to
1048576 and the size of the parameter area to 1073741824.
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: He Gao <hegao@google.com>
---
drivers/md/dm-core.h | 2 ++
drivers/md/dm-ioctl.c | 3 ++-
drivers/md/dm-table.c | 9 +++++++--
3 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 5a7d270b32c0..eff11df6c32e 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -21,6 +21,8 @@
#include "dm-ima.h"
#define DM_RESERVED_MAX_IOS 1024
+#define DM_MAX_TARGETS 1048576
+#define DM_MAX_TARGET_PARAMS 1024
struct dm_kobject_holder {
struct kobject kobj;
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 815c41e1ebdb..c1bcc857c1b6 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1859,7 +1859,8 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
if (copy_from_user(param_kernel, user, minimum_data_size))
return -EFAULT;
- if (param_kernel->data_size < minimum_data_size)
+ if (unlikely(param_kernel->data_size < minimum_data_size) ||
+ unlikely(param_kernel->data_size > DM_MAX_TARGETS * DM_MAX_TARGET_PARAMS))
return -EINVAL;
secure_data = param_kernel->flags & DM_SECURE_DATA_FLAG;
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 46ec4590f62f..52083d397fc4 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -126,7 +126,12 @@ static int alloc_targets(struct dm_table *t, unsigned int num)
int dm_table_create(struct dm_table **result, fmode_t mode,
unsigned num_targets, struct mapped_device *md)
{
- struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
+ struct dm_table *t;
+
+ if (num_targets > DM_MAX_TARGETS)
+ return -EOVERFLOW;
+
+ t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
return -ENOMEM;
@@ -140,7 +145,7 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
if (!num_targets) {
kfree(t);
- return -ENOMEM;
+ return -EOVERFLOW;
}
if (alloc_targets(t, num_targets)) {
--
2.44.0.rc0.258.g7320e95886-goog
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