From: Linus Torvalds <torvalds@linux-foundation.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>
Subject: Re: Crypto Fixes for 4.12
Date: Thu, 15 Jun 2017 18:04:44 +0900 [thread overview]
Message-ID: <CA+55aFwU1ZvJZK8x9QQtROjOVHG_ks-H3XpU+hjuf8BTxndN3g@mail.gmail.com> (raw)
In-Reply-To: <20170615005443.GA30435@gondor.apana.org.au>
On Thu, Jun 15, 2017 at 9:54 AM, Herbert Xu <herbert@gondor.apana.org.au> wrote:
>
> This push fixes a bug on sparc where we may dereference freed stack
> memory.
Ugh, that's a particularly ugly fix for a random gcc bug on a random
architecture that almost nobody tests.
In other words, it's nasty. It's nasty because nobody sane will ever
realize this pattern, and the code will either bit-rot or just happen
again somewhere else.
I'd have been *much* happier if this had been some nicer abstraction
that is built up around the use of SHASH_DESC_ON_STACK(), and just
have some rule that "SHASH_DESC_ON_STACK()" needs to be paired with
retrieving the final value and then a SHASH_DESC_DEALLOC() or
whatever.
Then you *could* implement SHASH_DESC_ON_STACK() as a kmalloc, and
SHASH_DESC_DEALLOC() would be a kfree - but with an alloca()-like
allocation the SHASH_DESC_DEALLOC() would be that "barrier_data()".
At that point the interface would make _sense_ at some conceptual
level, rather than being a random hack for a small collection of
random users of this thing.
There's a fair number of SHASH_DESC_ON_STACK users, are all the others
safe for some random reason that just happens to be about code
generation? Did people actually verify that?
Linus
next prev parent reply other threads:[~2017-06-15 9:04 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-19 10:27 Crypto Fixes for 4.9 Herbert Xu
2016-11-23 5:36 ` Herbert Xu
2016-12-05 6:37 ` Herbert Xu
2016-12-10 6:01 ` Herbert Xu
2016-12-13 13:24 ` Crypto Update for 4.10 Herbert Xu
2017-02-23 12:51 ` Crypto Update for 4.11 Herbert Xu
2017-05-01 14:26 ` Crypto Update for 4.12 Herbert Xu
2017-07-05 13:01 ` Crypto Update for 4.13 Herbert Xu
2017-07-05 20:02 ` Linus Torvalds
2017-07-06 2:19 ` Herbert Xu
2017-07-14 14:18 ` Crypto Fixes " Herbert Xu
2017-07-28 8:49 ` Herbert Xu
2017-08-09 12:04 ` Herbert Xu
2017-08-14 9:43 ` Herbert Xu
2017-09-01 7:53 ` Herbert Xu
2017-09-22 8:44 ` Crypto Fixes for 4.14 Herbert Xu
2017-10-12 10:51 ` Herbert Xu
2017-10-30 7:20 ` Herbert Xu
2017-11-06 6:37 ` Herbert Xu
2017-11-28 23:09 ` Crypto Fixes for 4.15 Herbert Xu
2017-12-11 7:22 ` Herbert Xu
2017-12-22 6:49 ` Herbert Xu
2018-01-05 7:38 ` Herbert Xu
2018-01-12 6:44 ` Herbert Xu
2018-02-12 3:17 ` Crypto Fixes for 4.16 Herbert Xu
2018-04-28 8:05 ` Crypto Fixes for 4.17 Herbert Xu
2018-05-30 16:17 ` Herbert Xu
2018-06-22 14:54 ` Crypto Fixes for 4.18 Herbert Xu
2018-07-08 16:20 ` Herbert Xu
2018-07-08 18:31 ` Linus Torvalds
2018-07-09 9:47 ` Ondrej Mosnáček
2018-07-09 15:52 ` Linus Torvalds
2018-07-19 7:39 ` Herbert Xu
2018-08-03 5:44 ` Herbert Xu
2018-08-09 5:47 ` Herbert Xu
2018-08-29 3:33 ` Crypto Fixes for 4.19 Herbert Xu
2018-09-19 6:22 ` Herbert Xu
2018-09-19 13:23 ` Greg KH
2018-09-19 16:10 ` process? [Re: Crypto Fixes for 4.19] Randy Dunlap
2018-09-19 16:40 ` Greg KH
2018-09-19 16:48 ` Randy Dunlap
2018-09-19 17:00 ` Willy Tarreau
2018-10-05 2:08 ` Crypto Fixes for 4.19 Herbert Xu
2018-10-05 15:37 ` Greg KH
2018-11-16 6:31 ` Crypto Fixes for 4.20 Herbert Xu
2018-12-07 6:14 ` Herbert Xu
2019-01-18 10:40 ` Crypto Fixes for 5.0 Herbert Xu
2019-02-01 5:42 ` Herbert Xu
2019-02-01 7:37 ` Linus Torvalds
2019-02-15 2:47 ` [GIT] " Herbert Xu
2019-02-15 17:10 ` pr-tracker-bot
2019-02-28 5:56 ` Herbert Xu
2019-03-02 0:20 ` pr-tracker-bot
2019-03-02 2:42 ` Herbert Xu
2019-03-02 17:10 ` pr-tracker-bot
2019-03-05 8:11 ` [GIT] Crypto Update for 5.1 Herbert Xu
2019-03-05 17:40 ` pr-tracker-bot
2019-05-06 3:29 ` [GIT] Crypto Update for 5.2 Herbert Xu
2019-05-07 3:25 ` pr-tracker-bot
2019-07-08 15:08 ` [GIT] Crypto Update for 5.3 Herbert Xu
2019-07-09 4:45 ` pr-tracker-bot
2019-03-12 4:58 ` [GIT] Crypto Fixes for 5.1 Herbert Xu
2019-03-13 17:10 ` pr-tracker-bot
2019-04-08 5:48 ` Herbert Xu
2019-04-08 6:25 ` pr-tracker-bot
2019-04-18 5:17 ` Herbert Xu
2019-04-18 15:20 ` pr-tracker-bot
2019-04-25 7:26 ` Herbert Xu
2019-04-25 16:25 ` pr-tracker-bot
2019-05-15 6:05 ` [GIT] Crypto Fixes for 5.2 Herbert Xu
2019-05-15 16:10 ` pr-tracker-bot
2019-05-21 12:58 ` Herbert Xu
2019-05-21 19:55 ` pr-tracker-bot
2019-06-06 6:03 ` Herbert Xu
2019-06-06 20:20 ` pr-tracker-bot
2019-07-05 4:24 ` Herbert Xu
2019-07-05 4:40 ` pr-tracker-bot
2019-07-19 3:12 ` [GIT] Crypto Fixes for 5.3 Herbert Xu
2019-07-19 19:45 ` pr-tracker-bot
2019-08-09 6:15 ` Herbert Xu
2019-08-09 16:35 ` pr-tracker-bot
2019-08-30 7:39 ` Herbert Xu
2019-08-31 2:01 ` Linus Torvalds
2019-08-31 12:12 ` Herbert Xu
2019-08-31 2:10 ` pr-tracker-bot
2017-09-04 10:12 ` Crypto Update for 4.14 Herbert Xu
2017-11-13 7:43 ` Crypto Update for 4.15 Herbert Xu
2018-01-29 14:50 ` Crypto Update for 4.16 Herbert Xu
2018-04-04 15:27 ` Crypto Update for 4.17 Herbert Xu
2018-06-04 17:15 ` Crypto Update for 4.18 Herbert Xu
2018-08-15 12:05 ` Crypto Update for 4.19 Herbert Xu
2018-10-23 10:09 ` Crypto Update for 4.20 Herbert Xu
2018-10-25 23:46 ` Linus Torvalds
2018-12-26 13:22 ` Crypto Update for 4.21 Herbert Xu
2018-12-26 16:49 ` Eric Biggers
2018-12-27 1:03 ` Herbert Xu
2016-12-15 16:07 ` Crypto Fixes for 4.10 Herbert Xu
2016-12-27 9:45 ` Herbert Xu
2016-12-30 10:19 ` Herbert Xu
2017-01-11 11:56 ` Herbert Xu
2017-02-01 9:04 ` Herbert Xu
2017-02-06 9:25 ` Herbert Xu
2017-03-04 7:41 ` Crypto Fixes for 4.11 Herbert Xu
2017-03-15 6:31 ` Herbert Xu
2017-03-24 13:46 ` Herbert Xu
2017-03-31 10:29 ` Herbert Xu
2017-04-10 11:04 ` Herbert Xu
2017-04-18 10:27 ` Herbert Xu
2017-05-23 3:42 ` Crypto Fixes for 4.12 Herbert Xu
2017-06-08 9:23 ` Herbert Xu
2017-06-08 14:05 ` David Miller
2017-06-09 2:52 ` Herbert Xu
2017-06-15 0:54 ` Herbert Xu
2017-06-15 9:04 ` Linus Torvalds [this message]
2017-06-15 9:05 ` Linus Torvalds
2017-06-15 9:42 ` Herbert Xu
2017-06-15 15:02 ` David Miller
2017-06-15 15:01 ` David Miller
2017-06-16 12:50 ` Theodore Ts'o
2017-06-16 16:49 ` David Miller
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