[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#18784: Coultdn't compile emacs-24.4
From: |
Ulrich Mueller |
Subject: |
bug#18784: Coultdn't compile emacs-24.4 |
Date: |
Mon, 16 Mar 2015 21:04:08 +0100 |
>>>>> On Mon, 16 Mar 2015, Eli Zaretskii wrote:
>> I guess if PIE is used in order to place Emacs's code at randomized
>> addresses (different address every time an Emacs process is launched),
>> it can break the dump because our subr objects will end up with pointers
>> to addresses that aren't valid any more (might be other such problems,
>> but that's the first that comes to my mind).
> Then this is only an issue on systems where PIE == address
> randomization, isn't it?
That would be my guess too. Here are some gdb backtraces showing that
the problem occurs in unexelf.c:
https://bugs.gentoo.org/494316#c13
https://bugs.gentoo.org/526948#c9
http://debbugs.gnu.org/13847#5
There is a long history of Emacs catching up with kernel hardening
in this area. It started with setting ADDR_NO_RANDOMIZE via Linux
personality(2), then setting the NORANDEXEC flag with paxctl(1) or
setfattr(1). Now it seems that we need -nopie in addition.
My impression is that these are all workarounds that don't address the
real issue.
- bug#18784: Coultdn't compile emacs-24.4, (continued)
- bug#18784: Coultdn't compile emacs-24.4, Ulrich Mueller, 2015/03/13
- bug#18784: Coultdn't compile emacs-24.4, Ulrich Mueller, 2015/03/13
- bug#18784: Coultdn't compile emacs-24.4, Stefan Monnier, 2015/03/13
- bug#18784: Coultdn't compile emacs-24.4, Ulrich Mueller, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Stefan Monnier, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Eli Zaretskii, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Stefan Monnier, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Eli Zaretskii, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Stefan Monnier, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Eli Zaretskii, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4,
Ulrich Mueller <=
- bug#18784: Coultdn't compile emacs-24.4, Stefan Monnier, 2015/03/16
- bug#18784: Coultdn't compile emacs-24.4, Ulrich Mueller, 2015/03/29
- bug#18784: Coultdn't compile emacs-24.4, Ulrich Mueller, 2015/03/16