Re: [Gnu-arch-users] Re: tla get --hard-links available

[Andrea Arcangeli]

On Fri, Oct 03, 2003 at 11:35:11AM -0700, Davide Libenzi wrote:
> On Fri, 3 Oct 2003, Andrea Arcangeli wrote:
> 
> > watch the above mkdir, that's totally broken, that's an _open_ w/o the
> > LD_PRELOAD set! Sounds very risky to enable it ;)
> 
> It seems that the loader/strace have problems. For files outside the
> FLCOW_PATH (/proc/... likely) the library is simply a pass through. You
> can look at the code, it's about 100 lines of trivial code. I'm running it
> on my desktop with FLCOW_PATH=/home/davide/arch-projects and it works
> flawlessy here.
> 
> 
> 
> > the IP where it crashes is this (provided by the kernel via `dmesg`, much
> > easier than gdb core dump ;):
> >
> > ps[21959]: segfault at 0000000000000000 rip 0000002a9583563c rsp 
> > 0000007fbfffe740 error 4
> > cat[21967] trap invalid operand rip:7fbfffeaba rsp:7fbfffe6a8 error:0
> >
> > I attached the assembly of the library. By mixing the rip (equivalent of 
> > eip)
> > with the results of the mmap call and elf offsets, it's possible to find 
> > the C
> > code that crashed. But it takes too much time so I'm postponing this for 
> > next
> > week. If you want to go ahead you're welcome! ;)
> 
> The fault rip is outside of the [MAP address, += library size] range :(
> Can you :
> 
> # nm /lib64/libc.so.6 | grep open

attached.

Andrea - If you prefer relying on open source software, check these links:
            rsync.kernel.org::pub/scm/linux/kernel/bkcvs/linux-2.[45]/
            http://www.cobite.com/cvsps/

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