[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <alpine.LNX.2.11.1504171100550.3767@monopod.intra.ispras.ru>
Date: Fri, 17 Apr 2015 11:12:20 +0300 (MSK)
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] replace 'hlt' by 'ud2' in i386/x32/x86_64 a_crash
implementations
On Fri, 17 Apr 2015, Rich Felker wrote:
> On Thu, Apr 16, 2015 at 08:58:59PM +0300, Alexander Monakov wrote:
> > ---
> > ud2 is also what GCC and Clang use to implement __builtin_trap()
> >
> > ud2 causes SIGILL rather than SIGSEGV; SIGSEGV is more likely to have a custom
> > signal handler installed
>
> I've pondered instead using:
>
> push $-1
> mov $175,%eax
> xor %ebx,%ebx
> mov %esp,%ecx
> int $128
> hlt // or ud2?
>
> This should be uncatchable but it's moderately larger.
An argument in favor of plain hlt/ud2 is that registers and memory are
preserved, in case someone will be analyzing the coredump.
Alexander
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
