Description of problem: In bug 210779, comment #5 says that this page is mapped read-only for the kernel and not the user process and, later, points out that this entry does not appear in /proc/<pid>/maps for later releases. It would seem that the fix which crept into i386 when it shouldn't have. Version-Release number of selected component (if applicable): 2.6.9-67.EL (for example) How reproducible: always Steps to Reproduce: 1. grep ^ffff /proc/self/maps Actual results: Observe that there is a map starting at ffffe000 and that it is, supposedly accessible. Note that mprotect, for example, for an address in this range will return ENOMEN indicating that the page isn't accessible. Note also that this region is conspicuous by its absence on an RHEL5 machine. Expected results: The region should be marked inaccessible or not there at all. Additional info:
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