RE: segv at strcmp

[umut aymakoglu <umutaymak@yahoo.com>]

Hi -
  The gcc version is gcc-3.2-29 and the flags we pass
to gcc are : -O -ansi -fwritable-strings -fsigned-char
-D_GNU_SOURCE -D_REENTRANT

thanks,
Umut
--- "Luck, Tony" <tony.luck@intel.com> wrote:
> > We have hit a problem with strcmp() on UnitedLinux
> 1.0
> > with kernel: 2.4.19 and glibc: 2.2.5.
> > I am wondering if anybody has seen something like
> it
> > or knows if already there is a patch. I do not
> have a
> > small repro but i will try to explain:
> > 
> > The segv happens at memcmp() at a line like:
> > 'strcmp(x, "this is 24 chars long")' where x is a
> char
> > pointer with a length of 7 and the constant has a
> > length of 24. x is located at the first 8 bytes of
> the
> > last 16 bytes at the end of a non-contiguous
> shared
> > memory segment. memcmp() segvs when it tries to
> load 8
> > bytes from the "r19" register which initially has
> the
> > address of x and points to the end of the segment
> when
> > the segv happens.
> 
> Sounds like your compiler converted the strcmp(str,
> const_str)
> into memcmp(str, const_str, strlen(const_str)) ...
> and then
> the memcmp fell off the end of the page.
> 
> What version of gcc are you using, and what
> arguments are you
> passing to gcc?
> 
> -Tony


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