Description
The do_shmat function in ipc/shm.c in the Linux kernel through 4.9.12 does not restrict the address calculated by a certain rounding operation, which allows local users to map page zero, and consequently bypass a protection mechanism that exists for the mmap system call, by making crafted shmget and shmat system calls in a privileged context.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
n/a n/a
n/aaffected
References
- https://usn.ubuntu.com/3583-2/ ↗
- https://usn.ubuntu.com/3583-1/ ↗
- http://www.securitytracker.com/id/1037918 ↗
- http://www.securityfocus.com/bid/96754 ↗
- http://www.debian.org/security/2017/dsa-3804 ↗
- https://bugzilla.kernel.org/show_bug.cgi?id=192931 ↗
- https://github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01b8 ↗
- https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7 ↗