kernel: unlimiting the stack disables ASLR

A weakness was found in the Linux ASLR implementation. Any user able to running 32-bit applications in a x86 machine can disable ASLR by setting the RLIMITSTACK resource to unlimited...

The vulnerability of the patch offset2lib in the Linux operating system’s kernel allows a hacker to gain access to the stack protection mechanism.

The vulnerability of patch offset2lib in Linux operating systems arises from the minimal memory range between the upper boundary of the stack and the PIE binary code segment, which is located in memory starting at 0x80000000. This occurs when the RLIMITSTACK parameter is set to RLIMINFINITY, and ...

UBUNTU-CVE-2017-1000371

The offset2lib patch as used by the Linux Kernel contains a vulnerability, if RLIMITSTACK is set to RLIMINFINITY and 1 Gigabyte of memory is allocated the maximum under the 1/4 restriction then the stack will be grown down to 0x80000000, and as the PIE binary is mapped above 0x80000000 the minimu...