Messages in this thread | | | From | Stephan Mueller <> | Subject | Re: [PATCH 3/4] DRBG: fix memory corruption for AES192 | Date | Fri, 04 Jul 2014 05:36:03 +0200 |
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Am Freitag, 4. Juli 2014, 11:12:35 schrieb Herbert Xu:
Hi Herbert,
> On Tue, Jul 01, 2014 at 05:08:48PM +0200, Stephan Mueller wrote: > > For the CTR DRBG, the drbg_state->scratchpad temp buffer (i.e. the > > memory location immediately before the drbg_state->tfm variable > > is the buffer that the BCC function operates on. BCC operates > > blockwise. Making the temp buffer drbg_statelen(drbg) in size is > > sufficient when the DRBG state length is a multiple of the block > > size. For AES192 this is not the case and the length for temp is > > insufficient (yes, that also means for such ciphers, the final > > output of all BCC rounds are truncated before used to update the > > state of the DRBG!!). > > > > The patch enlarges the temp buffer from drbg_statelen to > > drbg_statelen + drbg_blocklen to have sufficient space. > > > > Reported-by: Fengguang Wu <fengguang.wu@intel.com> > > Signed-off-by: Stephan Mueller <smueller@chronox.de> > > BTW your patches were all corrupted by your mailer so I had to > fix them by hand. Please check the cryptodev tree to ensure > that my fixes are correct.
The patch fixing the memory corruption is completely and correctly applied.
Apologies for sending broken patches. If I shall resend them corrected, please let me know. > > In future please test your patches by applying your own patches > returned via the list.
I will do that.
-- Ciao Stephan
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