This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use


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


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]