linux-kernel - Re: [PATCH v2] efivarfs: Replace invalid slashes with exclamation marks in dentries.

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Message-ID: <CAMj1kXH9B0TevUEN=CGn9TCYCgr37zX+kSfmqxeALPmUG4GWCA@mail.gmail.com>
Date:   Fri, 25 Sep 2020 09:48:57 +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 v2] efivarfs: Replace invalid slashes with exclamation
 marks in dentries.

On Fri, 25 Sep 2020 at 09:45, 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/.
>
> Signed-off-by: Michael Schaller <misch@...gle.com>

Thanks

> Tested-by: Michael Schaller <misch@...gle.com>

I will drop this - in general, it is assumed that you test your own
patches before sending them to the list, so this is implicit. Also,
tested-by's given on the list tend to carry more weight than ones that
are givenin private and added to the patch by the authors themselves.


> ---
>  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
>