lkml.org 
[lkml]   [2015]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm
On Tue, May 19, 2015 at 03:15:21PM +0800, Herbert Xu wrote:
> On Tue, May 19, 2015 at 12:13:17AM -0700, Jaegeuk Kim wrote:
> >
> > The key generation is done by ext4_generate_encryption_key in
> > fs/ext4/crypto_key.c.
> > And, ext4_file_mmap and ext4_file_open trigger it.
>
> Well that's where you should be doing crypto_alloc_ablkcipher
> and crypto_ablkcipher_setkey.
>
> The whole point of a crypto tfm is to represent a key so any time
> you get one you should create a crypto tfm. Carrying around a raw
> key is just wrong.

So, IMHO, it can consume memory too much, since tfm should be allocated for
every inodes and be alive until inode eviction.
Apart from giving GFP_NOFS, do you mean that it is a wrong approach?

Thanks,

>
> Cheers,
> --
> Email: Herbert Xu <herbert@gondor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt


\
 
 \ /
  Last update: 2015-05-19 09:41    [W:1.465 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site