[PATCH] efivarfs: Replace invalid slashes with exclamation marks in dentries.

[PATCH] efivarfs: Replace invalid slashes with exclamation marks in dentries.

[Michael Schaller]

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/.
---
 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

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

[Ard Biesheuvel]

On Fri, 18 Sep 2020 at 13:25, Michael Schaller <misch@google.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
>

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

[Michael Schaller]

On Fri, Sep 25, 2020 at 9:05 AM Ard Biesheuvel <ardb@kernel.org> wrote:
>
> On Fri, 18 Sep 2020 at 13:25, Michael Schaller <misch@google.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?
>
I've sent a v2 patch in a new mail thread.
> > ---
> >  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
> >