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Asked: 2026-05-24T01:51:42+00:00

I’ve to deal with old C- Sourcecode. After I managed to compile it, while

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I’ve to deal with old C- Sourcecode. After I managed to compile it, while running it I get the error message

mmap zero page: Operation not permitted

Sometimes followed by an Segmentation fault.

I’ve read some stuff about the mmap() command, but I can’t get around, where this error message comes from and how I should deal with it.

Can I “reenable” it? (The program used to work with an older Linux System).

I’m working with Ubuntu 11.04 and GCC 3.4

Any hints very much appreciated 🙂

thanks
Markus

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1 Answer

  1. Editorial Team

    Mapping the zero page is disabled by default, as a security measure (doing so can make some NULL pointer dereference bugs exploitable).

    You can re-enable it by setting the vm.mmap_min_addr sysctl to 0 (also available at /proc/sys/vm/mmap_min_addr). You should be able to make this the default at boot on Ubuntu by adding vm.mmap_min_addr = 0 to /etc/sysctl.conf.

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