well by the way the bug was not in the kernel
but in the libc.
The man page says :
RETURN VALUE
On success, zero is returned. On error, -1 is returned,
and errno is set appropriately.
But the code of the libc for ptrace under i386
does a special thing with all the PEEK stuff.
There must be an absurd historical reason behind
it, nope ? :)
Sorry for the noise, the next time I'll check
further before to annoy you.
Sed.
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