Eric,
On 21.10.2016 20:42, Eric Biggers wrote:
> On Fri, Oct 21, 2016 at 02:48:35PM +0200, Richard Weinberger wrote:
>> +
>> + if (!dentry)
>> + return ERR_PTR(-ECHILD);
>> +
>> + if (ubifs_crypt_is_encrypted(inode)) {
>> + err = fscrypt_get_encryption_info(inode);
>> + if (err)
>> + return ERR_PTR(err);
>> + } else
>> + return ui->data;
>> +
>
> This will make path lookups drop out of RCU mode when an unencrypted symlink is
> followed. This can be avoided by checking for unencrypted symlinks first:
Oh! Thanks for pointing this out!
> if (!ubifs_crypt_is_encrypted(inode))
> return ui->data;
>
> if (!dentry)
> return ERR_PTR(-ECHILD);
>
> err = fscrypt_get_encryption_info(inode);
> if (err)
> return ERR_PTR(err);
>
>> +
>> + pstr.name[err] = '\0';
>> +
>
> In 4.9, fscrypt_fname_{disk_to_usr,usr_to_disk} return 0 instead of the output
> length, so this will need to be changed to 'pstr.name[pstr.len] = '\0''.
Noted.
Thanks,
//richard
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