linux-kernel - Re: [PATCH v6 4/9] ovl: Create ovl_casefold() to support casefolded strncmp()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <37e714a7-ee0e-42e0-af7e-34c6b6503cfa@igalia.com>
Date: Wed, 27 Aug 2025 17:45:52 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Amir Goldstein <amir73il@...il.com>,
 Gabriel Krisman Bertazi <krisman@...e.de>
Cc: Miklos Szeredi <miklos@...redi.hu>, Theodore Tso <tytso@....edu>,
 linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
 kernel-dev@...lia.com
Subject: Re: [PATCH v6 4/9] ovl: Create ovl_casefold() to support casefolded
 strncmp()

Em 26/08/2025 04:19, Amir Goldstein escreveu:
> 
> Andre,
> 
> Just noticed this is a bug, should have been if (*dst), but anyway following
> Gabriel's comments I have made this change in my tree (pending more
> strict related changes):
> 
> static int ovl_casefold(struct ovl_readdir_data *rdd, const char *str, int len,
>                          char **dst)
> {
>          const struct qstr qstr = { .name = str, .len = len };
>          char *cf_name;
>          int cf_len;
> 
>          if (!IS_ENABLED(CONFIG_UNICODE) || !rdd->map || is_dot_dotdot(str, len))
>                  return 0;
> 
>          cf_name = kmalloc(NAME_MAX, GFP_KERNEL);
>          if (!cf_name) {
>                  rdd->err = -ENOMEM;
>                  return -ENOMEM;
>          }
> 
>          cf_len = utf8_casefold(rdd->map, &qstr, *dst, NAME_MAX);

The third argument here should be cf_name, not *dst anymore.

>          if (cf_len > 0)
>                  *dst = cf_name;
>          else
>                  kfree(cf_name);
> 
>          return cf_len;
> }
> 

> Thanks,
> Amir.