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The vdso base address has always been randomized, and I don't think there's
anything particularly wrong with the range over which it's randomized,
but the implementation seems to have been buggy since the very beginning.
This fixes the implementation to remove a large bias that caused a small
fraction of possible vdso load addresess to be vastly more likely than
the rest of the possible addresses.
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Merge tag 'pr-20141220-x86-vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux into x86/urgent
Pull a VDSO fix from Andy Lutomirski:
"One vdso fix for a longstanding ASLR bug that's been in the news lately.
The vdso base address has always been randomized, and I don't think there's
anything particularly wrong with the range over which it's randomized,
but the implementation seems to have been buggy since the very beginning.
This fixes the implementation to remove a large bias that caused a small
fraction of possible vdso load addresess to be vastly more likely than
the rest of the possible addresses."
Signed-off-by: Ingo Molnar <mingo@kernel.org>
fbe1bf1406