* [RFC PATCH V6 0/2] Btrfs: get/set label of a mounted file system
@ 2012-12-18 3:05 Jeff Liu
2012-12-18 3:05 ` [RFC PATCH V6 2/1] Btrfs: Add a new ioctl to get the " Jeff Liu
2012-12-18 3:06 ` [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
0 siblings, 2 replies; 8+ messages in thread
From: Jeff Liu @ 2012-12-18 3:05 UTC (permalink / raw)
To: linux-btrfs; +Cc: anand.jain, miaox, kreijack
Hello,
Here is quick fix for btrfs set lable ioctl(2) based on v5, it does label length check up with
strnlen() to avoid searching a zero could go beyond the page limit touching an un-mapped page
and raising an segmentation fault with strlen().
V6->v5:
- Improve the input label string validation with strnlen().
The old versions can be found at:
v5:
http://www.spinics.net/lists/linux-btrfs/msg20888.html
v4:
http://permalink.gmane.org/gmane.comp.file-systems.btrfs/21618
v3:
https://patchwork.kernel.org/patch/1124642/
v2:
http://permalink.gmane.org/gmane.comp.file-systems.btrfs/12877
v1:
http://permalink.gmane.org/gmane.comp.file-systems.btrfs/12872
Thanks,
-Jeff
^ permalink raw reply [flat|nested] 8+ messages in thread
* [RFC PATCH V6 2/1] Btrfs: Add a new ioctl to get the label of a mounted file system
2012-12-18 3:05 [RFC PATCH V6 0/2] Btrfs: get/set label of a mounted file system Jeff Liu
@ 2012-12-18 3:05 ` Jeff Liu
2012-12-18 3:06 ` [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
1 sibling, 0 replies; 8+ messages in thread
From: Jeff Liu @ 2012-12-18 3:05 UTC (permalink / raw)
To: linux-btrfs; +Cc: anand.jain, miaox, Goffredo Baroncelli
Introduce a new ioctl BTRFS_IOC_GET_FSLABEL to fetch the label of a mounted file system.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
---
fs/btrfs/ioctl.c | 15 +++++++++++++++
fs/btrfs/ioctl.h | 2 ++
2 files changed, 17 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8fcf9a5..6a2488a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3699,6 +3699,19 @@ out:
return ret;
}
+static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ const char *label = root->fs_info->super_copy->label;
+ int ret;
+
+ mutex_lock(&root->fs_info->volume_mutex);
+ ret = copy_to_user(arg, label, strlen(label));
+ mutex_unlock(&root->fs_info->volume_mutex);
+
+ return ret ? -EFAULT : 0;
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
@@ -3797,6 +3810,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_qgroup_create(root, argp);
case BTRFS_IOC_QGROUP_LIMIT:
return btrfs_ioctl_qgroup_limit(root, argp);
+ case BTRFS_IOC_GET_FSLABEL:
+ return btrfs_ioctl_get_fslabel(file, argp);
}
return -ENOTTY;
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 731e287..5b2cbef 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -451,6 +451,8 @@ struct btrfs_ioctl_send_args {
struct btrfs_ioctl_qgroup_create_args)
#define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
struct btrfs_ioctl_qgroup_limit_args)
+#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
+ char[BTRFS_LABEL_SIZE])
#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
struct btrfs_ioctl_get_dev_stats)
#endif
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change the label of a mounted file system
2012-12-18 3:05 [RFC PATCH V6 0/2] Btrfs: get/set label of a mounted file system Jeff Liu
2012-12-18 3:05 ` [RFC PATCH V6 2/1] Btrfs: Add a new ioctl to get the " Jeff Liu
@ 2012-12-18 3:06 ` Jeff Liu
2012-12-18 3:31 ` Miao Xie
2012-12-19 14:21 ` David Sterba
1 sibling, 2 replies; 8+ messages in thread
From: Jeff Liu @ 2012-12-18 3:06 UTC (permalink / raw)
To: linux-btrfs; +Cc: anand.jain, miaox, Goffredo Baroncelli
Introduce a new ioctl BTRFS_IOC_SET_FSLABEL to change the label of a mounted file system.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Cc: Miao Xie <miaox@cn.fujitsu.com>
Cc: Goffredo Baroncelli <kreijack@inwind.it>
---
fs/btrfs/ioctl.c | 39 +++++++++++++++++++++++++++++++++++++++
fs/btrfs/ioctl.h | 2 ++
2 files changed, 41 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 6a2488a..2bb037e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3712,6 +3712,43 @@ static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
return ret ? -EFAULT : 0;
}
+static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_super_block *super_block = root->fs_info->super_copy;
+ struct btrfs_trans_handle *trans;
+ char label[BTRFS_LABEL_SIZE];
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(label, arg, sizeof(label)))
+ return -EFAULT;
+
+ if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE)
+ return -EINVAL;
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ mutex_lock(&root->fs_info->volume_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out_unlock;
+ }
+
+ strcpy(super_block->label, label);
+ btrfs_end_transaction(trans, root);
+
+out_unlock:
+ mutex_unlock(&root->fs_info->volume_mutex);
+ mnt_drop_write_file(file);
+ return ret;
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
@@ -3812,6 +3849,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_qgroup_limit(root, argp);
case BTRFS_IOC_GET_FSLABEL:
return btrfs_ioctl_get_fslabel(file, argp);
+ case BTRFS_IOC_SET_FSLABEL:
+ return btrfs_ioctl_set_fslabel(file, argp);
}
return -ENOTTY;
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 5b2cbef..2abe239 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -453,6 +453,8 @@ struct btrfs_ioctl_send_args {
struct btrfs_ioctl_qgroup_limit_args)
#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
char[BTRFS_LABEL_SIZE])
+#define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \
+ char[BTRFS_LABEL_SIZE])
#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
struct btrfs_ioctl_get_dev_stats)
#endif
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change the label of a mounted file system
2012-12-18 3:06 ` [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
@ 2012-12-18 3:31 ` Miao Xie
2012-12-18 18:00 ` Goffredo Baroncelli
2012-12-19 14:21 ` David Sterba
1 sibling, 1 reply; 8+ messages in thread
From: Miao Xie @ 2012-12-18 3:31 UTC (permalink / raw)
To: Jeff Liu; +Cc: linux-btrfs, anand.jain, Goffredo Baroncelli
On Tue, 18 Dec 2012 11:06:07 +0800, Jeff Liu wrote:
> Introduce a new ioctl BTRFS_IOC_SET_FSLABEL to change the label of a mounted file system.
>
> Signed-off-by: Jie Liu <jeff.liu@oracle.com>
> Signed-off-by: Anand Jain <anand.jain@oracle.com>
> Cc: Miao Xie <miaox@cn.fujitsu.com>
> Cc: Goffredo Baroncelli <kreijack@inwind.it>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
>
> ---
> fs/btrfs/ioctl.c | 39 +++++++++++++++++++++++++++++++++++++++
> fs/btrfs/ioctl.h | 2 ++
> 2 files changed, 41 insertions(+)
>
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 6a2488a..2bb037e 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3712,6 +3712,43 @@ static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
> return ret ? -EFAULT : 0;
> }
>
> +static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
> +{
> + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
> + struct btrfs_super_block *super_block = root->fs_info->super_copy;
> + struct btrfs_trans_handle *trans;
> + char label[BTRFS_LABEL_SIZE];
> + int ret;
> +
> + if (!capable(CAP_SYS_ADMIN))
> + return -EPERM;
> +
> + if (copy_from_user(label, arg, sizeof(label)))
> + return -EFAULT;
> +
> + if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE)
> + return -EINVAL;
> +
> + ret = mnt_want_write_file(file);
> + if (ret)
> + return ret;
> +
> + mutex_lock(&root->fs_info->volume_mutex);
> + trans = btrfs_start_transaction(root, 1);
> + if (IS_ERR(trans)) {
> + ret = PTR_ERR(trans);
> + goto out_unlock;
> + }
> +
> + strcpy(super_block->label, label);
> + btrfs_end_transaction(trans, root);
> +
> +out_unlock:
> + mutex_unlock(&root->fs_info->volume_mutex);
> + mnt_drop_write_file(file);
> + return ret;
> +}
> +
> long btrfs_ioctl(struct file *file, unsigned int
> cmd, unsigned long arg)
> {
> @@ -3812,6 +3849,8 @@ long btrfs_ioctl(struct file *file, unsigned int
> return btrfs_ioctl_qgroup_limit(root, argp);
> case BTRFS_IOC_GET_FSLABEL:
> return btrfs_ioctl_get_fslabel(file, argp);
> + case BTRFS_IOC_SET_FSLABEL:
> + return btrfs_ioctl_set_fslabel(file, argp);
> }
>
> return -ENOTTY;
> diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
> index 5b2cbef..2abe239 100644
> --- a/fs/btrfs/ioctl.h
> +++ b/fs/btrfs/ioctl.h
> @@ -453,6 +453,8 @@ struct btrfs_ioctl_send_args {
> struct btrfs_ioctl_qgroup_limit_args)
> #define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
> char[BTRFS_LABEL_SIZE])
> +#define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \
> + char[BTRFS_LABEL_SIZE])
> #define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
> struct btrfs_ioctl_get_dev_stats)
> #endif
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change the label of a mounted file system
2012-12-18 3:31 ` Miao Xie
@ 2012-12-18 18:00 ` Goffredo Baroncelli
2012-12-19 3:42 ` Jeff Liu
0 siblings, 1 reply; 8+ messages in thread
From: Goffredo Baroncelli @ 2012-12-18 18:00 UTC (permalink / raw)
Cc: miaox, Jeff Liu, linux-btrfs, anand.jain
Hi Jeff,
On 12/18/2012 04:31 AM, Miao Xie wrote:
[...]
>> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
[...]
>> +static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
>> +{
>> + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
>> + struct btrfs_super_block *super_block = root->fs_info->super_copy;
>> + struct btrfs_trans_handle *trans;
>> + char label[BTRFS_LABEL_SIZE];
>> + int ret;
>> +
>> + if (!capable(CAP_SYS_ADMIN))
>> + return -EPERM;
>> +
>> + if (copy_from_user(label, arg, sizeof(label)))
>> + return -EFAULT;
>> +
>> + if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE)
>> + return -EINVAL;
>> +
>> + ret = mnt_want_write_file(file);
>> + if (ret)
>> + return ret;
>> +
>> + mutex_lock(&root->fs_info->volume_mutex);
>> + trans = btrfs_start_transaction(root, 1);
>> + if (IS_ERR(trans)) {
>> + ret = PTR_ERR(trans);
>> + goto out_unlock;
>> + }
>> +
>> + strcpy(super_block->label, label);
I think that you removed for mistake the following line
+ label[BTRFS_LABEL_SIZE - 1] = '\0';
In the V5 patch it was present.
May be we could replace strcpy() with strlcpy(super_block->label, label,
BTRFS_LABEL_SIZE-1) ?
BR
G.Baroncelli
--
gpg @keyserver.linux.it: Goffredo Baroncelli (kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change the label of a mounted file system
2012-12-18 18:00 ` Goffredo Baroncelli
@ 2012-12-19 3:42 ` Jeff Liu
0 siblings, 0 replies; 8+ messages in thread
From: Jeff Liu @ 2012-12-19 3:42 UTC (permalink / raw)
To: kreijack; +Cc: Goffredo Baroncelli, miaox, linux-btrfs, anand.jain
Hi Goffredo,
Thanks for your review.
On 12/19/2012 02:00 AM, Goffredo Baroncelli wrote:
> Hi Jeff,
>
> On 12/18/2012 04:31 AM, Miao Xie wrote:
> [...]
>>> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> [...]
>
>>> +static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
>>> +{
>>> + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
>>> + struct btrfs_super_block *super_block = root->fs_info->super_copy;
>>> + struct btrfs_trans_handle *trans;
>>> + char label[BTRFS_LABEL_SIZE];
>>> + int ret;
>>> +
>>> + if (!capable(CAP_SYS_ADMIN))
>>> + return -EPERM;
>>> +
>>> + if (copy_from_user(label, arg, sizeof(label)))
>>> + return -EFAULT;
>>> +
>>> + if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE)
>>> + return -EINVAL;
>>> +
>>> + ret = mnt_want_write_file(file);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + mutex_lock(&root->fs_info->volume_mutex);
>>> + trans = btrfs_start_transaction(root, 1);
>>> + if (IS_ERR(trans)) {
>>> + ret = PTR_ERR(trans);
>>> + goto out_unlock;
>>> + }
>>> +
>>> + strcpy(super_block->label, label);
>
> I think that you removed for mistake the following line
>
> + label[BTRFS_LABEL_SIZE - 1] = '\0';
I removed it since it was used to cut the label string off the max array
size but now we have the previous strnlen().
>
> In the V5 patch it was present.
>
> May be we could replace strcpy() with strlcpy(super_block->label, label,
> BTRFS_LABEL_SIZE-1) ?
That is ok to me. However, it should be strlcpy(super_block->label,
label, BTRFS_LABEL_SIZE) ranther than 'BTRFS_LABREL_SIZE -1' because
strlcpy() does "size - 1" internally. i.e.
strlcpy(char *d, const char *s, size_t size)
{
size_t ret = strlen(s);
.....
size_t len = (ret >= size) ? size - 1 : ret;
....
}
But does the current implementation make anything wrong? :)
Thanks,
-Jeff
>
> BR
> G.Baroncelli
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change the label of a mounted file system
2012-12-18 3:06 ` [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
2012-12-18 3:31 ` Miao Xie
@ 2012-12-19 14:21 ` David Sterba
2012-12-20 8:18 ` Jeff Liu
1 sibling, 1 reply; 8+ messages in thread
From: David Sterba @ 2012-12-19 14:21 UTC (permalink / raw)
To: Jeff Liu; +Cc: linux-btrfs, anand.jain, miaox, Goffredo Baroncelli
On Tue, Dec 18, 2012 at 11:06:07AM +0800, Jeff Liu wrote:
> +static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
> +{
> + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
> + struct btrfs_super_block *super_block = root->fs_info->super_copy;
> + struct btrfs_trans_handle *trans;
> + char label[BTRFS_LABEL_SIZE];
> + int ret;
> +
> + if (!capable(CAP_SYS_ADMIN))
> + return -EPERM;
> +
> + if (copy_from_user(label, arg, sizeof(label)))
> + return -EFAULT;
> +
> + if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE)
> + return -EINVAL;
> +
> + ret = mnt_want_write_file(file);
> + if (ret)
> + return ret;
> +
> + mutex_lock(&root->fs_info->volume_mutex);
> + trans = btrfs_start_transaction(root, 1);
> + if (IS_ERR(trans)) {
> + ret = PTR_ERR(trans);
> + goto out_unlock;
> + }
> +
> + strcpy(super_block->label, label);
> + btrfs_end_transaction(trans, root);
If this fails, eg. with EIO, it will not be reported back to the user
ret = btrfs_end_transaction(trans, root);
should fix it.
> +
> +out_unlock:
> + mutex_unlock(&root->fs_info->volume_mutex);
> + mnt_drop_write_file(file);
> + return ret;
> +}
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change the label of a mounted file system
2012-12-19 14:21 ` David Sterba
@ 2012-12-20 8:18 ` Jeff Liu
0 siblings, 0 replies; 8+ messages in thread
From: Jeff Liu @ 2012-12-20 8:18 UTC (permalink / raw)
To: dsterba; +Cc: linux-btrfs, anand.jain, miaox, Goffredo Baroncelli
On 12/19/2012 10:21 PM, David Sterba wrote:
> On Tue, Dec 18, 2012 at 11:06:07AM +0800, Jeff Liu wrote:
>> +static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
>> +{
>> + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
>> + struct btrfs_super_block *super_block = root->fs_info->super_copy;
>> + struct btrfs_trans_handle *trans;
>> + char label[BTRFS_LABEL_SIZE];
>> + int ret;
>> +
>> + if (!capable(CAP_SYS_ADMIN))
>> + return -EPERM;
>> +
>> + if (copy_from_user(label, arg, sizeof(label)))
>> + return -EFAULT;
>> +
>> + if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE)
>> + return -EINVAL;
>> +
>> + ret = mnt_want_write_file(file);
>> + if (ret)
>> + return ret;
>> +
>> + mutex_lock(&root->fs_info->volume_mutex);
>> + trans = btrfs_start_transaction(root, 1);
>> + if (IS_ERR(trans)) {
>> + ret = PTR_ERR(trans);
>> + goto out_unlock;
>> + }
>> +
>> + strcpy(super_block->label, label);
>> + btrfs_end_transaction(trans, root);
>
> If this fails, eg. with EIO, it will not be reported back to the user
>
> ret = btrfs_end_transaction(trans, root);
>
> should fix it.
Thank you, I'll send out a revised version after a little while.
-Jeff
>
>> +
>> +out_unlock:
>> + mutex_unlock(&root->fs_info->volume_mutex);
>> + mnt_drop_write_file(file);
>> + return ret;
>> +}
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2012-12-20 8:19 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
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2012-12-18 3:05 [RFC PATCH V6 0/2] Btrfs: get/set label of a mounted file system Jeff Liu
2012-12-18 3:05 ` [RFC PATCH V6 2/1] Btrfs: Add a new ioctl to get the " Jeff Liu
2012-12-18 3:06 ` [RFC PATCH V6 2/2] Btrfs: Add a new ioctl to change " Jeff Liu
2012-12-18 3:31 ` Miao Xie
2012-12-18 18:00 ` Goffredo Baroncelli
2012-12-19 3:42 ` Jeff Liu
2012-12-19 14:21 ` David Sterba
2012-12-20 8:18 ` Jeff Liu
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