According to the test results in bug 1653889, it looks like this has
been addressed on arm64. Closing bug.
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1501645
Title:
arm64 kernel has READ_IMPLIES_EXEC in personality, makes data areas
executable
Status in linux package in Ubuntu:
Fix Released
Bug description:
$ uname -p
aarch64
$ cat /proc/version_signature
Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25
$ cat /proc/self/personality
00400000
include/uapi/linux/personality.h in the linux source tree defines
"READ_IMPLIES_EXEC = 0x0400000,"
A patch to start to address this was submitted upstream at
https://lkml.org/lkml/2014/5/14/520 but did not get taken.
This was noticed by the nx portiong of the qrt test-kernel-security
tests on arm64 that indicate that the data sections are allowed to
execute code.
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