| Message ID | 20220407032505.3797948-1-zhangwensheng5@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [-next,v2] nbd: fix possible overflow on 'first_minor' in nbd_dev_add() | expand |
friendly ping... 在 2022/4/7 11:25, Zhang Wensheng 写道: > When 'index' is a big numbers, it may become negative which forced > to 'int'. then 'index << part_shift' might overflow to a positive > value that is not greater than '0xfffff', then sysfs might complains > about duplicate creation. Because of this, move the 'index' judgment > to the front will fix it and be better. > > Fixes: b0d9111a2d53 ("nbd: use an idr to keep track of nbd devices") > Fixes: 940c264984fd ("nbd: fix possible overflow for 'first_minor' in nbd_dev_add()") > Signed-off-by: Zhang Wensheng <zhangwensheng5@huawei.com> > --- > v1->v2: > - add the line "disk->first_minor = index << part_shift;" which has > been deleted by mistake in v1. > > drivers/block/nbd.c | 23 ++++++++++++----------- > 1 file changed, 12 insertions(+), 11 deletions(-) > > diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c > index 5a1f98494ddd..9448aacbcf0f 100644 > --- a/drivers/block/nbd.c > +++ b/drivers/block/nbd.c > @@ -1800,17 +1800,7 @@ static struct nbd_device *nbd_dev_add(int index, unsigned int refs) > refcount_set(&nbd->refs, 0); > INIT_LIST_HEAD(&nbd->list); > disk->major = NBD_MAJOR; > - > - /* Too big first_minor can cause duplicate creation of > - * sysfs files/links, since index << part_shift might overflow, or > - * MKDEV() expect that the max bits of first_minor is 20. > - */ > disk->first_minor = index << part_shift; > - if (disk->first_minor < index || disk->first_minor > MINORMASK) { > - err = -EINVAL; > - goto out_free_work; > - } > - > disk->minors = 1 << part_shift; > disk->fops = &nbd_fops; > disk->private_data = nbd; > @@ -1915,8 +1905,19 @@ static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info) > if (!netlink_capable(skb, CAP_SYS_ADMIN)) > return -EPERM; > > - if (info->attrs[NBD_ATTR_INDEX]) > + if (info->attrs[NBD_ATTR_INDEX]) { > index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); > + > + /* > + * Too big first_minor can cause duplicate creation of > + * sysfs files/links, since index << part_shift might overflow, or > + * MKDEV() expect that the max bits of first_minor is 20. > + */ > + if (index < 0 || index > MINORMASK >> part_shift) { > + printk(KERN_ERR "nbd: illegal input index %d\n", index); > + return -EINVAL; > + } > + } > if (!info->attrs[NBD_ATTR_SOCKETS]) { > printk(KERN_ERR "nbd: must specify at least one socket\n"); > return -EINVAL;
friendly ping... 在 2022/4/16 14:09, zhangwensheng (E) 写道: > friendly ping... > > 在 2022/4/7 11:25, Zhang Wensheng 写道: >> When 'index' is a big numbers, it may become negative which forced >> to 'int'. then 'index << part_shift' might overflow to a positive >> value that is not greater than '0xfffff', then sysfs might complains >> about duplicate creation. Because of this, move the 'index' judgment >> to the front will fix it and be better. >> >> Fixes: b0d9111a2d53 ("nbd: use an idr to keep track of nbd devices") >> Fixes: 940c264984fd ("nbd: fix possible overflow for 'first_minor' in >> nbd_dev_add()") >> Signed-off-by: Zhang Wensheng <zhangwensheng5@huawei.com> >> --- >> v1->v2: >> - add the line "disk->first_minor = index << part_shift;" which has >> been deleted by mistake in v1. >> >> drivers/block/nbd.c | 23 ++++++++++++----------- >> 1 file changed, 12 insertions(+), 11 deletions(-) >> >> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c >> index 5a1f98494ddd..9448aacbcf0f 100644 >> --- a/drivers/block/nbd.c >> +++ b/drivers/block/nbd.c >> @@ -1800,17 +1800,7 @@ static struct nbd_device *nbd_dev_add(int >> index, unsigned int refs) >> refcount_set(&nbd->refs, 0); >> INIT_LIST_HEAD(&nbd->list); >> disk->major = NBD_MAJOR; >> - >> - /* Too big first_minor can cause duplicate creation of >> - * sysfs files/links, since index << part_shift might overflow, or >> - * MKDEV() expect that the max bits of first_minor is 20. >> - */ >> disk->first_minor = index << part_shift; >> - if (disk->first_minor < index || disk->first_minor > MINORMASK) { >> - err = -EINVAL; >> - goto out_free_work; >> - } >> - >> disk->minors = 1 << part_shift; >> disk->fops = &nbd_fops; >> disk->private_data = nbd; >> @@ -1915,8 +1905,19 @@ static int nbd_genl_connect(struct sk_buff >> *skb, struct genl_info *info) >> if (!netlink_capable(skb, CAP_SYS_ADMIN)) >> return -EPERM; >> - if (info->attrs[NBD_ATTR_INDEX]) >> + if (info->attrs[NBD_ATTR_INDEX]) { >> index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); >> + >> + /* >> + * Too big first_minor can cause duplicate creation of >> + * sysfs files/links, since index << part_shift might >> overflow, or >> + * MKDEV() expect that the max bits of first_minor is 20. >> + */ >> + if (index < 0 || index > MINORMASK >> part_shift) { >> + printk(KERN_ERR "nbd: illegal input index %d\n", index); >> + return -EINVAL; >> + } >> + } >> if (!info->attrs[NBD_ATTR_SOCKETS]) { >> printk(KERN_ERR "nbd: must specify at least one socket\n"); >> return -EINVAL; > .
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 5a1f98494ddd..9448aacbcf0f 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -1800,17 +1800,7 @@ static struct nbd_device *nbd_dev_add(int index, unsigned int refs) refcount_set(&nbd->refs, 0); INIT_LIST_HEAD(&nbd->list); disk->major = NBD_MAJOR; - - /* Too big first_minor can cause duplicate creation of - * sysfs files/links, since index << part_shift might overflow, or - * MKDEV() expect that the max bits of first_minor is 20. - */ disk->first_minor = index << part_shift; - if (disk->first_minor < index || disk->first_minor > MINORMASK) { - err = -EINVAL; - goto out_free_work; - } - disk->minors = 1 << part_shift; disk->fops = &nbd_fops; disk->private_data = nbd; @@ -1915,8 +1905,19 @@ static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info) if (!netlink_capable(skb, CAP_SYS_ADMIN)) return -EPERM; - if (info->attrs[NBD_ATTR_INDEX]) + if (info->attrs[NBD_ATTR_INDEX]) { index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]); + + /* + * Too big first_minor can cause duplicate creation of + * sysfs files/links, since index << part_shift might overflow, or + * MKDEV() expect that the max bits of first_minor is 20. + */ + if (index < 0 || index > MINORMASK >> part_shift) { + printk(KERN_ERR "nbd: illegal input index %d\n", index); + return -EINVAL; + } + } if (!info->attrs[NBD_ATTR_SOCKETS]) { printk(KERN_ERR "nbd: must specify at least one socket\n"); return -EINVAL;
When 'index' is a big numbers, it may become negative which forced to 'int'. then 'index << part_shift' might overflow to a positive value that is not greater than '0xfffff', then sysfs might complains about duplicate creation. Because of this, move the 'index' judgment to the front will fix it and be better. Fixes: b0d9111a2d53 ("nbd: use an idr to keep track of nbd devices") Fixes: 940c264984fd ("nbd: fix possible overflow for 'first_minor' in nbd_dev_add()") Signed-off-by: Zhang Wensheng <zhangwensheng5@huawei.com> --- v1->v2: - add the line "disk->first_minor = index << part_shift;" which has been deleted by mistake in v1. drivers/block/nbd.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-)