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Re: Dangerous use of alloca


From: Samuel Thibault
Subject: Re: Dangerous use of alloca
Date: Tue, 15 Mar 2016 17:31:53 +0100
User-agent: Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30)

Justus Winter, on Tue 15 Mar 2016 14:39:00 +0100, wrote:
> Quoting Agustina Arzille (2016-03-15 14:11:27)
> > Hello, everyone.
> > 
> > I was browsing some gnumach source files, and noticed some dangerous use
> > of the gcc builtin 'alloca'. In the file kern/bootstrap.c, lines 212 and
> > 228, we have the following statement:
> > 
> > memcpy (alloca (len), ...)
> 
> Good catch.  However, alloca is dangerous even if used correctly, and
> is best be avoided.

What do you mean by "dangerous"?  I don't think we'll ever get a command
line that does not fit into the stack.

Samuel



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