Re: continuous key press results in core dump (PR#331)

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Subject: Re: continuous key press results in core dump (PR#331)
From: Peter Dalgaard BSA (p.dalgaard@biostat.ku.dk)
Date: Mon 22 Nov 1999 - 06:58:36 EST


Message-ID: <x2bt8nef43.fsf@blueberry.kubism.ku.dk>

rnassar@duke.edu writes:

> I encountered this today (I admit it is a result of downright abuse)
>
> Segmentation fault under abnormal conditions (as when stupid finger
> accidentally leaned on key):

...which is exactly why this kind of fault mustn't happen.

> at 128 (at least by my count) "continuous" (zzzzzzzzz... or 123qwertyuio...)
> characters but NOT when enclosed in " ", and not if numbers.
>
> > 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
> [1] 1.234568e+157
> > zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
> Segmentation fault (core dumped)

Yup, in dstruct.c we have

static int ddVal(SEXP name)
{
    char buf[128], *endp, *val;
    int rval;

    strcpy(buf, CHAR(name));

..which at the very least has to have a str*n*cpy in order not to
corrupt the stack if CHAR(name) is too large. Or perhaps better:
allocate buf explicitly instead of via a stack variable.

Not sure I'll be able to get it fixed tonight though.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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