mmap patch works in Virtualbox, not in QEMU

[valdis.kletnieks at vt.edu]

On Sun, 19 Nov 2017 11:25:57 +0300, Lev Olshvang said:

> I downloaded Buidroot and buil QEMU x86_64 environment with kernel 4.9
> I applied my patch to mmap (added MAP_DENYWRITE for shared libraries) before
> building kernel.

Did you test to make sure that it doesn't apply that flag to mmap for things
other than shared libraries?  How do you identify that it's a shared library
and not something else?
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