diff options
| -rw-r--r-- | drivers/md/dm-ioctl.c | 52 | ||||
| -rw-r--r-- | include/uapi/linux/dm-ioctl.h | 6 |
2 files changed, 37 insertions, 21 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 9ae11b2994f8..7eb0682d574f 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1560,7 +1560,8 @@ static int check_version(unsigned int cmd, struct dm_ioctl __user *user) return r; } -#define DM_PARAMS_VMALLOC 0x0001 /* Params alloced with vmalloc not kmalloc */ +#define DM_PARAMS_KMALLOC 0x0001 /* Params alloced with kmalloc */ +#define DM_PARAMS_VMALLOC 0x0002 /* Params alloced with vmalloc */ #define DM_WIPE_BUFFER 0x0010 /* Wipe input buffer before returning from ioctl */ static void free_params(struct dm_ioctl *param, size_t param_size, int param_flags) @@ -1568,66 +1569,80 @@ static void free_params(struct dm_ioctl *param, size_t param_size, int param_fla if (param_flags & DM_WIPE_BUFFER) memset(param, 0, param_size); + if (param_flags & DM_PARAMS_KMALLOC) + kfree(param); if (param_flags & DM_PARAMS_VMALLOC) vfree(param); - else - kfree(param); } -static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param, int *param_flags) +static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kernel, + int ioctl_flags, + struct dm_ioctl **param, int *param_flags) { - struct dm_ioctl tmp, *dmi; + struct dm_ioctl *dmi; int secure_data; + const size_t minimum_data_size = sizeof(*param_kernel) - sizeof(param_kernel->data); - if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) + if (copy_from_user(param_kernel, user, minimum_data_size)) return -EFAULT; - if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) + if (param_kernel->data_size < minimum_data_size) return -EINVAL; - secure_data = tmp.flags & DM_SECURE_DATA_FLAG; + secure_data = param_kernel->flags & DM_SECURE_DATA_FLAG; *param_flags = secure_data ? DM_WIPE_BUFFER : 0; + if (ioctl_flags & IOCTL_FLAGS_NO_PARAMS) { + dmi = param_kernel; + dmi->data_size = minimum_data_size; + goto data_copied; + } + /* * Try to avoid low memory issues when a device is suspended. * Use kmalloc() rather than vmalloc() when we can. */ dmi = NULL; - if (tmp.data_size <= KMALLOC_MAX_SIZE) - dmi = kmalloc(tmp.data_size, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); + if (param_kernel->data_size <= KMALLOC_MAX_SIZE) { + dmi = kmalloc(param_kernel->data_size, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); + if (dmi) + *param_flags |= DM_PARAMS_KMALLOC; + } if (!dmi) { - dmi = __vmalloc(tmp.data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH, PAGE_KERNEL); - *param_flags |= DM_PARAMS_VMALLOC; + dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH, PAGE_KERNEL); + if (dmi) + *param_flags |= DM_PARAMS_VMALLOC; } if (!dmi) { - if (secure_data && clear_user(user, tmp.data_size)) + if (secure_data && clear_user(user, param_kernel->data_size)) return -EFAULT; return -ENOMEM; } - if (copy_from_user(dmi, user, tmp.data_size)) + if (copy_from_user(dmi, user, param_kernel->data_size)) goto bad; +data_copied: /* * Abort if something changed the ioctl data while it was being copied. */ - if (dmi->data_size != tmp.data_size) { + if (dmi->data_size != param_kernel->data_size) { DMERR("rejecting ioctl: data size modified while processing parameters"); goto bad; } /* Wipe the user buffer so we do not return it to userspace */ - if (secure_data && clear_user(user, tmp.data_size)) + if (secure_data && clear_user(user, param_kernel->data_size)) goto bad; *param = dmi; return 0; bad: - free_params(dmi, tmp.data_size, *param_flags); + free_params(dmi, param_kernel->data_size, *param_flags); return -EFAULT; } @@ -1671,6 +1686,7 @@ static int ctl_ioctl(uint command, struct dm_ioctl __user *user) struct dm_ioctl *uninitialized_var(param); ioctl_fn fn = NULL; size_t input_param_size; + struct dm_ioctl param_kernel; /* only root can play with this */ if (!capable(CAP_SYS_ADMIN)) @@ -1704,7 +1720,7 @@ static int ctl_ioctl(uint command, struct dm_ioctl __user *user) /* * Copy the parameters into kernel space. */ - r = copy_params(user, ¶m, ¶m_flags); + r = copy_params(user, ¶m_kernel, ioctl_flags, ¶m, ¶m_flags); if (r) return r; diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h index 539b179b349c..b8a6bddf0727 100644 --- a/include/uapi/linux/dm-ioctl.h +++ b/include/uapi/linux/dm-ioctl.h @@ -267,9 +267,9 @@ enum { #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 -#define DM_VERSION_MINOR 23 -#define DM_VERSION_PATCHLEVEL 1 -#define DM_VERSION_EXTRA "-ioctl (2012-12-18)" +#define DM_VERSION_MINOR 24 +#define DM_VERSION_PATCHLEVEL 0 +#define DM_VERSION_EXTRA "-ioctl (2013-01-15)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ |