Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

From: Stas Sergeev
Date: Mon Sep 25 2006 - 00:34:14 EST


Valdis.Kletnieks@xxxxxx wrote:
But why exactly? They do:
and mmap fails.
Where is the fault of an app here?
Are you suggesting that it's not an app's fault/problem if it tries to
open a writable file on a R/O filesystem? Because it's essentially the
same problem....
It is not really the same - the app is not trying to
create an "executable" file on a noexec filesystem.
PROT_EXEC never required the exec permission on a file
btw. The MAP_PRIVATE mmap roughly means a read of the
file into the memory, where the program can do anything
with its data, including an execution. Does the R/O
filesystem disallow PROT_WRITE for MAP_PRIVATE? Haven't
tried, but I hope it doesn't.

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