32 lines
1.8 KiB
Diff
32 lines
1.8 KiB
Diff
From adc6a92ae92647c9b098ffb5ff257c8ab685411e Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Tue, 30 May 2017 16:43:48 -0400
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Subject: [PATCH] man: update MemoryDenyWriteExecute description for executable
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stacks
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Without going into details, mention that libraries are also covered by the
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filters, and that executable stacks are a no no.
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Closes #5970.
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(cherry picked from commit 03c3c520402db803cffd5abc7ea0c55fba95fbb3)
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---
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man/systemd.exec.xml | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
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index fb64cd6d8e..9a9387b798 100644
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--- a/man/systemd.exec.xml
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+++ b/man/systemd.exec.xml
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@@ -1655,8 +1655,8 @@
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<citerefentry><refentrytitle>mprotect</refentrytitle><manvolnum>2</manvolnum></citerefentry> system calls with
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<constant>PROT_EXEC</constant> set and
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<citerefentry><refentrytitle>shmat</refentrytitle><manvolnum>2</manvolnum></citerefentry> system calls with
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- <constant>SHM_EXEC</constant> set. Note that this option is incompatible with programs that generate program
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- code dynamically at runtime, such as JIT execution engines, or programs compiled making use of the code
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+ <constant>SHM_EXEC</constant> set. Note that this option is incompatible with programs and libraries that
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+ generate program code dynamically at runtime, including JIT execution engines, executable stacks, and code
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"trampoline" feature of various C compilers. This option improves service security, as it makes harder for
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software exploits to change running code dynamically. Note that this feature is fully available on x86-64, and
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partially on x86. Specifically, the <function>shmat()</function> protection is not available on x86. Note that
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