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    Subject[tip:x86/vdso] x86-64: Add CONFIG_UNSAFE_VSYSCALLS to feature-removal-schedule
    Commit-ID:  38172403a97828ae2ea12281b19528582d6625d4
    Gitweb: http://git.kernel.org/tip/38172403a97828ae2ea12281b19528582d6625d4
    Author: Andy Lutomirski <luto@mit.edu>
    AuthorDate: Sun, 5 Jun 2011 13:50:25 -0400
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Mon, 6 Jun 2011 09:43:15 +0200

    x86-64: Add CONFIG_UNSAFE_VSYSCALLS to feature-removal-schedule

    CONFIG_UNSAFE_VSYSCALLS was added in the previous patch as a
    temporary hack to avoid penalizing users who don't build glibc
    from git.

    Signed-off-by: Andy Lutomirski <luto@mit.edu>
    Cc: Jesper Juhl <jj@chaosbits.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Arjan van de Ven <arjan@infradead.org>
    Cc: Jan Beulich <JBeulich@novell.com>
    Cc: richard -rw- weinberger <richard.weinberger@gmail.com>
    Cc: Mikael Pettersson <mikpe@it.uu.se>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Louis Rilling <Louis.Rilling@kerlabs.com>
    Cc: Valdis.Kletnieks@vt.edu
    Cc: pageexec@freemail.hu
    Link: http://lkml.kernel.org/r/4de62bfbf6974f14d0e9d9ae37cc137dbc926a30.1307292171.git.luto@mit.edu
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    ---
    Documentation/feature-removal-schedule.txt | 9 +++++++++
    1 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
    index 1a9446b..94b4470 100644
    --- a/Documentation/feature-removal-schedule.txt
    +++ b/Documentation/feature-removal-schedule.txt
    @@ -600,3 +600,12 @@ Why: Superseded by the UVCIOC_CTRL_QUERY ioctl.
    Who: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

    ----------------------------
    +
    +What: CONFIG_UNSAFE_VSYSCALLS (x86_64)
    +When: When glibc 2.14 or newer is ubitquitous. Perhaps mid-2012.
    +Why: Having user-executable code at a fixed address is a security problem.
    + Turning off CONFIG_UNSAFE_VSYSCALLS mostly removes the risk but will
    + make the time() function slower on glibc versions 2.13 and below.
    +Who: Andy Lutomirski <luto@mit.edu>
    +
    +----------------------------

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