Information Leak in mincore() in the Linux Kernel CVE-2017-16994

[Marcus Meissner <meissner () suse de>]

Hi,

Mitre has allocated CVE-2017-16994 for this bug found by Google P0 team member jannh.

The walk_hugetlb_range function in mm/pagewalk.c in the Linux kernel before 4.14.2 mishandles holes in hugetlb ranges, 
which allows local users to obtain sensitive information from uninitialized kernel memory via crafted use of the 
mincore() system call.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16994
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=373c4557d2aa362702c4c2d41288fb1e54990b7c 
https://bugs.chromium.org/p/project-zero/issues/detail?id=1431

Ciao, Marcus