Messages in this thread | | | From | Stefan Rompf <> | Subject | Re: [Patch 2.6] dm-crypt: zero key before freeing it | Date | Tue, 24 Jan 2006 22:29:06 +0100 |
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Am Dienstag 24 Januar 2006 05:49 schrieb Neil Brown:
> >--- linux-2.6.14.4/drivers/md/dm-crypt.c.old 2005-12-16 18:27:05.000000000 > > +0100 +++ linux-2.6.14.4/drivers/md/dm-crypt.c 2005-12-28 > > 12:49:13.000000000 +0100 @@ -694,6 +694,7 @@ bad3: > > bad2: > > crypto_free_tfm(tfm); > > bad1: > >+ memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); > > kfree(cc); > > return -EINVAL; > > } > > There is a small problem with this patch. > If the 'goto bad1' branch is taken, then 'cc->key_size' will not be > defined. > I think you need the following patch on top.
Why? This is from today's git, just before the first goto bad1
559 cc->key_size = key_size; 560 if ((!key_size && strcmp(argv[1], "-") != 0) || 561 (key_size && crypt_decode_key(cc->key, argv[1], key_size) < 0)) { 562 ti->error = PFX "Error decoding key"; 563 goto bad1; 564 }
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