From: "Tobin C. Harding" <me@tobin.cc>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [GIT PULL] hash addresses printed with %p
Date: Thu, 30 Nov 2017 08:28:18 +1100 [thread overview]
Message-ID: <20171129212818.GK6217@eros> (raw)
In-Reply-To: <CA+55aFwjhjGZC9U68mo4hnnJXLWYxG3UYoz-=SwNfO-3N-Untg@mail.gmail.com>
On Wed, Nov 29, 2017 at 01:14:38PM -0800, Linus Torvalds wrote:
> On Wed, Nov 29, 2017 at 1:08 PM, Tobin C. Harding <me@tobin.cc> wrote:
> >
> > If you haven't wasted enough time on this can you tell me what you mean
> > by 'completely breaks %pK'?
>
> The whole point of %pK is that it's a "safer" %p that doesn't leak
> information if you set kptr_restrict.
>
> With that patch-set, it now leaks _more_ information than %p when
> kptr_restrict isn't set, so %pK went from "be more careful than %p" to
> "be wildly less careful than %p".
>
> Not because %pK itself changed, but because the semantics of %p did.
> The baseline moved, and the "safe" version did not.
Oh sweet, I was shitting bricks when I read your email :)
next prev parent reply other threads:[~2017-11-29 21:28 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-29 4:59 [GIT PULL] hash addresses printed with %p Tobin C. Harding
2017-11-29 19:22 ` Linus Torvalds
2017-11-29 19:39 ` Linus Torvalds
2017-11-29 20:54 ` Joe Perches
2017-11-29 21:05 ` Linus Torvalds
2017-11-29 21:31 ` Kees Cook
2017-11-29 21:08 ` Tobin C. Harding
2017-11-29 21:14 ` Linus Torvalds
2017-11-29 21:28 ` Tobin C. Harding [this message]
2017-11-29 21:36 ` Linus Torvalds
[not found] ` <CA+55aFwPXV0sXb+edcQc4epz0pWustZgJsoq95=a3OEDxynq7g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-30 16:32 ` Greg Kroah-Hartman
2017-11-30 16:32 ` Greg Kroah-Hartman
[not found] ` <20171130163235.GA27849-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-11-30 17:10 ` Greg Kroah-Hartman
2017-11-30 17:10 ` Greg Kroah-Hartman
[not found] ` <20171130171036.GB31817-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-11-30 17:18 ` Ard Biesheuvel
2017-11-30 17:18 ` Ard Biesheuvel
2017-12-01 9:48 ` Greg Kroah-Hartman
2017-12-01 9:54 ` Ard Biesheuvel
[not found] ` <CAKv+Gu-YyuE-Hs4MVPWfS8Exx0S6qo5sgV2VdO0MP5wEXSrM1Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-01 15:34 ` Greg Kroah-Hartman
2017-12-01 15:34 ` Greg Kroah-Hartman
[not found] ` <20171201153444.GA17867-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-12-01 16:33 ` Kees Cook
2017-12-01 16:33 ` Kees Cook
2017-12-02 8:51 ` Ard Biesheuvel
2017-12-02 22:22 ` Matt Fleming
2017-12-02 22:22 ` Matt Fleming
[not found] ` <20171202222244.GA3799-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2017-12-03 1:15 ` Dave Young
2017-12-03 1:15 ` Dave Young
2017-12-04 2:02 ` Dave Young
2017-12-04 2:02 ` Dave Young
2017-12-04 2:33 ` Joe Perches
[not found] ` <1512354837.6321.41.camel-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org>
2017-12-04 2:39 ` Dave Young
2017-12-04 2:39 ` Dave Young
[not found] ` <20171204020216.GA2436-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2017-12-04 7:36 ` Greg Kroah-Hartman
2017-12-04 7:36 ` Greg Kroah-Hartman
2017-12-04 9:29 ` Dave Young
[not found] ` <20171204092928.GA4421-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2017-12-04 9:34 ` Greg Kroah-Hartman
2017-12-04 9:34 ` Greg Kroah-Hartman
2017-12-04 9:48 ` Ard Biesheuvel
[not found] ` <CAKv+Gu8iOF1BCpZEVRwT=_6FbXsK0ve7fiWKA5R0D5x2P5MavA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-04 9:59 ` Greg Kroah-Hartman
2017-12-04 9:59 ` Greg Kroah-Hartman
[not found] ` <20171204095936.GA10547-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-12-04 10:03 ` Ard Biesheuvel
2017-12-04 10:03 ` Ard Biesheuvel
2017-12-04 10:11 ` Greg Kroah-Hartman
2017-12-04 12:51 ` David Laight
[not found] ` <d455baafa3d44669a774c7d555c01416-1XygrNkDbNvwg4NCKwmqgw@public.gmane.org>
2017-12-04 14:00 ` Greg Kroah-Hartman
2017-12-04 14:00 ` Greg Kroah-Hartman
[not found] ` <20171204140012.GA8744-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-12-05 5:14 ` Dave Young
2017-12-05 5:14 ` Dave Young
2017-12-05 8:09 ` Greg Kroah-Hartman
[not found] ` <20171205080957.GA18268-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-12-05 8:45 ` Dave Young
2017-12-05 8:45 ` Dave Young
2017-12-05 8:52 ` Greg Kroah-Hartman
[not found] ` <20171205085219.GA16055-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-12-05 9:25 ` Ard Biesheuvel
2017-12-05 9:25 ` Ard Biesheuvel
[not found] ` <CAKv+Gu9=4Rrgb3UgmP37LpTjd_xzZ2aVqA2KMAkek9Wxr8fSTA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-05 10:15 ` Greg Kroah-Hartman
2017-12-05 10:15 ` Greg Kroah-Hartman
2017-12-05 9:32 ` Dave Young
2017-12-05 9:32 ` Dave Young
[not found] ` <20171205084537.GA5974-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2017-12-05 9:24 ` Dave Young
2017-12-05 9:24 ` Dave Young
[not found] ` <20171205092410.GA16190-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2017-12-05 10:14 ` Greg Kroah-Hartman
2017-12-05 10:14 ` Greg Kroah-Hartman
2017-11-30 23:17 ` Linus Torvalds
2017-12-01 9:47 ` Greg Kroah-Hartman
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