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Re: [Gnu-arch-users] [MERGE-REQUEST]: segfault using variable length arg

From: Matthew Dempsky
Subject: Re: [Gnu-arch-users] [MERGE-REQUEST]: segfault using variable length argument list of rel_add_records()
Date: Wed, 06 Apr 2005 18:45:31 -0500

On Wed, 2005-04-06 at 10:48 +0200, Wolfgang Treutterer E1 wrote:
> I could figure out that the segfault occurred in the second call to
> va_arg(rp, rel_record) and the corresponding argument was the concluding
> 0. Obviously the compiler could not interpret the zero as rel_record
> type. The same observation applied to the other segfaults.

Hm, are you on a 64-bit system?

> There is a simple solution: replace the 0 in the calling function by
> rel_record_nil so that the compiler knows about the intended type when
> building the argument list.
> However, the function rel_add_record is widely used by other routines in
> libarch, libfsutils and libawk. Thus there are quite a lot locations to 
> patch. After fixing all occurences no more segfaults occurred.

This seems like an appropriate fix.  Your patch doesn't apply cleanly
against Tom's tla-1.3.2 branch though, but it seems like a short perl
script can redo the changes on any tree.

Does gcc have any features for warning for things like this?  There
should be an option to specify that the varargs list will all be of the
same type, and give a warning if any of them aren't being pushed onto
the stack as that type.

Matthew Dempsky <address@hidden>

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