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From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: [PATCH] replace 'hlt' by 'ud2' in i386/x32/x86_64 a_crash implementations
Date: Fri, 17 Apr 2015 01:55:00 -0400	[thread overview]
Message-ID: <20150417055500.GW6817@brightrain.aerifal.cx> (raw)
In-Reply-To: <1429207139-10359-1-git-send-email-amonakov@ispras.ru>

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. 

Rich


  reply	other threads:[~2015-04-17  5:55 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-16 17:58 Alexander Monakov
2015-04-17  5:55 ` Rich Felker [this message]
2015-04-17  8:12   ` Alexander Monakov
2015-04-17 16:44     ` Rich Felker
2015-04-17 18:48       ` Alexander Monakov
2015-04-17 20:23         ` Rich Felker

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