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  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:	Sun, 03 May 2015 15:34:14 +0300
From:	Anssi Hannula <>
To:	Herbert Xu <>
CC:	Theodore Ts'o <>,
	Andreas Dilger <>,, Michael Halcrow <>
Subject: Re: ext4 crypto: Do not select from EXT4_FS_ENCRYPTION


01.05.2015, 03:18, Herbert Xu kirjoitti:
> This patch adds a tristate EXT4_ENCRYPTION to do the selections
> for EXT4_FS_ENCRYPTION because selecting from a bool causes all
> the selected options to be built-in, even if EXT4 itself is a
> module.

Hmm, are you sure?

Since CONFIG_EXT4_FS_ENCRYPTION itself depends on CONFIG_EXT4_FS, the
selector for the selected options becomes (CONFIG_EXT4_FS_ENCRYPTION &&

Per my testing on git master (without this patch), if EXT4_FS=m and
EXT4_FS_ENCRYPTION=y, both "built-in" and "module" options are allowed
for the selected options (checked CONFIG_ENCRYPTED_KEYS myself).

So selector "(A=y && B=m)" results in requirement ">=m", which seems
reasonable (otherwise even just CONFIG_BLOCK=y would force them to y).

Am I missing something or this patch unneeded?

> Signed-off-by: Herbert Xu <>
> diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
> index 18228c2..024f228 100644
> --- a/fs/ext4/Kconfig
> +++ b/fs/ext4/Kconfig
> @@ -64,8 +64,8 @@ config EXT4_FS_SECURITY
>  	  If you are not using a security module that requires using
>  	  extended attributes for file security labels, say N.
> -	bool "Ext4 Encryption"
> +	tristate "Ext4 Encryption"
>  	depends on EXT4_FS
>  	select CRYPTO_AES
>  	select CRYPTO_CBC
> @@ -81,6 +81,11 @@ config EXT4_FS_ENCRYPTION
>  	  efficient since it avoids caching the encrypted and
>  	  decrypted pages in the page cache.
> +	bool
> +	default y
> +	depends on EXT4_ENCRYPTION
> +
>  config EXT4_DEBUG
>  	bool "EXT4 debugging support"
>  	depends on EXT4_FS

Anssi Hannula
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists