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Vulnerability Note VU#981222Linux kernel mremap(2) system call does not properly check return value from do_munmap() functionOverviewA vulnerability in the Linux mremap(2) system call could allow an authenticated, local attacker to execute arbitrary code with root privileges.I. DescriptionThe Linux kernel uses a linked list of vitrual memory area (VMA) descriptors to reference valid regions of the page table for a given process. VMA descriptors include information about the memory area such as start address, length, and page protection flags. A VMA effectively contains a range of page table entries (PTEs) that make up part of the page table.The mremap(2) system call has the ability to resize or move a VMA or part of a VMA within a process' memory space. mremap(2) contains a function called do_munmap() that is used to unmap regions of memory during resize or move operations. There is a limit on the number of VMA descriptors that can exist at one time, and do_munmap() does not create a new VMA descriptor if doing so would exceed this limit.
References
This vulnerability was researched and reported by Paul Starzetz of iSEC. This document was written by Art Manion.
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