[UNIX] PaX Linux Kernel Patch DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 05/04/04

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Date: 4 May 2004 15:51:30 +0200

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      PaX Linux Kernel Patch DoS
    ------------------------------------------------------------------------

    SUMMARY

    PaX is a collection of intrusion prevention patches for the Linux Kernel.
    Among others it can disable execution of code from specific memory pages
    that can help prevent buffer overflow exploitations.

    A bug in the PaX kernel patch allows for a denial of service condition on
    the kernel that effectively freezes the machine.

    DETAILS

    Vulnerable Systems:
     * PaX kernel patch for the Linux kernel 2.6, versions prior to 2004.05.01

    Immune Systems:
     * PaX kernel patch version 2004.05.01

    The denial-of-service condition arises when ASLR is enabled. The bug
    causes the kernel to enter an infinite loop. Part of the relevant code is
    presented below:
     ====================================================
    'linux/mm/mmap.c'

     if (start_addr != TASK_UNMAPPED_BASE) {

    #ifdef CONFIG_PAX_RANDMMAP
                    if (current->flags & PF_PAX_RANDMMAP)
                        start_addr = addr =
    TASK_UNMAPPED_BASE + mm->delta_mmap;
                    else
    #endif
                                                                           
     
                    start_addr = addr = TASK_UNMAPPED_BASE;
                    goto full_search;
                }
                return -ENOMEM;
     ====================================================

    Vendor Status:
    Gr-Security are aware of the problem and have already released a newer
    version. Also, a patch can be found at
    <http://pax.grsecurity.net/pax-linux-2.6.5-200405011700.patch>
    http://pax.grsecurity.net/pax-linux-2.6.5-200405011700.patch.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:chris@cr-secure.net>
    ChrisR-.

    ========================================

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