Messages in this thread | | | From | Andy Lutomirski <> | Date | Sat, 20 Dec 2014 17:11:12 -0800 | Subject | [GIT PULL] one vdso fix for x86/urgent |
| |
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(-)
| |