Messages in this thread | | | Date | Sun, 21 Dec 2014 11:18:27 +0100 | From | Ingo Molnar <> | Subject | Re: [GIT PULL] one vdso fix for x86/urgent |
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* Andy Lutomirski <luto@amacapital.net> wrote:
> Hi Ingo, etc, > > Please consider pulling for x86/urgent. This fixes a longstanding, > albeit relatively minor, issue in the x86 vdso randomization > algorithm. Note that this isn't super-urgent, as this bug isn't > directly exploitable, and it's as old as the vdso itself. > > Thanks, > Andy > > The following changes since commit e589c9e13aeb0c5539bf1314b3a78442ea8fc0c2: > > Merge branch 'x86-apic-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (2014-12-19 > 14:02:02 -0800) > > are available in the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git > tags/pr-20141220-x86-vdso > > for you to fetch changes up to 394f56fe480140877304d342dec46d50dc823d46: > > x86_64, vdso: Fix the vdso address randomization algorithm > (2014-12-20 16:56:57 -0800) > > ---------------------------------------------------------------- > 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. > > ---------------------------------------------------------------- > Andy Lutomirski (1): > x86_64, vdso: Fix the vdso address randomization algorithm > > arch/x86/vdso/vma.c | 45 +++++++++++++++++++++++++++++---------------- > 1 file changed, 29 insertions(+), 16 deletions(-)
Pulled into tip:x86/urgent, thanks a lot Andy!
Ingo
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