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| author | Mikulas Patocka <mpatocka@redhat.com> | 2024-01-09 15:57:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-25 16:16:18 +0200 |
| commit | 1ddc0c3f4996c4ca1216ede1fa7699a803204590 (patch) | |
| tree | a7987e3f6b670e22ba596407bb3e6a5d12dbee22 | |
| parent | aa62ab6ada92ba8780aa9355184720ee950242a7 (diff) | |
| download | linux-1ddc0c3f4996c4ca1216ede1fa7699a803204590.tar.gz linux-1ddc0c3f4996c4ca1216ede1fa7699a803204590.tar.bz2 linux-1ddc0c3f4996c4ca1216ede1fa7699a803204590.zip | |
dm: limit the number of targets and parameter size area
commit bd504bcfec41a503b32054da5472904b404341a4 upstream.
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.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
[srish: Apply to stable branch linux-4.19.y]
Signed-off-by: Srish Srinivasan <srish.srinivasan@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/md/dm-core.h | 2 | ||||
| -rw-r--r-- | drivers/md/dm-ioctl.c | 3 | ||||
| -rw-r--r-- | 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 8cda3f7ddbae..2542f0881ac6 100644 --- a/drivers/md/dm-core.h +++ b/drivers/md/dm-core.h @@ -18,6 +18,8 @@ #include "dm.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 88e89796ccbf..70929ff79eec 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1734,7 +1734,8 @@ 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 3faaf21be5b6..4822f66b08d9 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -187,7 +187,12 @@ 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; @@ -202,7 +207,7 @@ 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)) { |