Messages in this thread | | | Date | Fri, 29 Apr 2005 06:20:53 -0700 | From | Andrew Morton <> | Subject | Re: 2.6.12-rc3 mmap lack of consistency among runs |
| |
Hubert Tonneau <hubert.tonneau@fullpliant.org> wrote: > > Andrew Morton wrote: > > > > Maybe you're being bitten by the address space randomisation. > > > > Try > > echo 0 > /proc/sys/kernel/randomize_va_space > > Ok, it solves my issue, but: > > . desabling it through 'echo 0 > /proc/sys/kernel/randomize_va_space' is not > a solution because only the application knows that it wants it to be desabled, > and the application is not root so cannot write to /proc; morever the > application can only speak for itself so desabling should be on a per process > bias.
You can disable randomization on a per-executable basis by setting an ELF personality. I forget the magic incantation. Arjan?
> I can hardly imagine to publish a warning in the README such as: > This software only works if your Linux kernel is configured so that > /proc/sys/kernel/randomize_va_space = 0 > > . second, my process restart succeeding roughly in 50% cases means that the > randomisation performed is just a toy. A virus assuming fixed memory layout > will still succeed 50% of times to install.
Dunno.
> All in all, I'm not concerned about Linux kernel to randomise or not, > but I need to have a reliable way to request a memory region and be granted > that I can request the same one in a futur run. > What is the proper way to get such a memory area ?
MAP_FIXED? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |