linux-kernel - Re: [PATCH] efivarfs: Replace invalid slashes with exclamation marks in dentries.

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]

Date:   Fri, 25 Sep 2020 09:04:59 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Michael Schaller <misch@...gle.com>
Cc:     michael@...aller.de, Matthew Garrett <matthew.garrett@...ula.com>,
        Jeremy Kerr <jk@...abs.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] efivarfs: Replace invalid slashes with exclamation marks
 in dentries.

On Fri, 18 Sep 2020 at 13:25, Michael Schaller <misch@...gle.com> wrote:
>
> Without this patch efivarfs_alloc_dentry creates dentries with slashes in
> their name if the respective EFI variable has slashes in its name. This in
> turn causes EIO on getdents64, which prevents a complete directory listing
> of /sys/firmware/efi/efivars/.
>
> This patch replaces the invalid shlashes with exclamation marks like
> kobject_set_name_vargs does for /sys/firmware/efi/vars/ to have consistently
> named dentries under /sys/firmware/efi/vars/ and /sys/firmware/efi/efivars/.

Thanks Michael

Can you resend this with a signed-off-by line please?

> ---
>  fs/efivarfs/super.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
> index 28bb5689333a..15880a68faad 100644
> --- a/fs/efivarfs/super.c
> +++ b/fs/efivarfs/super.c
> @@ -141,6 +141,9 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
>
>         name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';
>
> +       /* replace invalid slashes like kobject_set_name_vargs does for /sys/firmware/efi/vars. */
> +       strreplace(name, '/', '!');
> +
>         inode = efivarfs_get_inode(sb, d_inode(root), S_IFREG | 0644, 0,
>                                    is_removable);
>         if (!inode)
> --
> 2.28.0.681.g6f77f65b4e-goog
>