Messages in this thread | | | From | Roland McGrath <> | Subject | Re: [PATCH] ELF: implement AT_RANDOM for future glibc use | Date | Mon, 6 Oct 2008 16:58:27 -0700 (PDT) |
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What mmap randomization and stack randomization actually use is get_random_int(), not get_random_bytes(). This is one of those weaker flavors seeded occasionally from the real entropy pool. (As is, it's not a good choice for getting 16 bytes of random at once, since it usually returns the same 4 bytes each time when called 4 times in quick succession.)
What glibc wants is some bits with a strength of randomness chosen by the kernel, and not to worry about the details. I think the strength applied to mmap and stack randomization is good enough for AT_RANDOM.
Thanks, Roland
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