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Enable regular file and FIFO protection

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These sysctls were added in Linux 4.19 (torvalds/linux@30aba6656f), and
we should enable them just like we enable the older hardlink/symlink
protection since v199. Implements #11414.
This commit is contained in:
Lucas Werkmeister 2019-01-16 00:16:10 +01:00 committed by Lennart Poettering
parent 850115b3a1
commit 2732587540
2 changed files with 17 additions and 0 deletions
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13
NEWS
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@ -29,6 +29,19 @@ CHANGES WITH 241 in spe:
-Db_pie=true option to meson to build position-independent
executables. Note that the meson option is supported since meson-0.49.
* The fs.protected_regular and fs.protected_fifos sysctls, which were
added in Linux 4.19 to make some data spoofing attacks harder, are
now enabled by default. While this will hopefully improve the
security of most installations, it is technically a backwards
incompatible change; to disable these sysctls again, place the
following lines in /etc/sysctl.d/60-protected.conf or a similar file:
fs.protected_regular = 0
fs.protected_fifos = 0
Note that the similar hardlink and symlink protection has been
enabled since v199, and may be disabled likewise.
CHANGES WITH 240:
* NoNewPrivileges=yes has been set for all long-running services

4
sysctl.d/50-default.conf
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@ -36,3 +36,7 @@ net.core.default_qdisc = fq_codel
# Enable hard and soft link protection
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
# Enable regular file and FIFO protection
fs.protected_regular = 1
fs.protected_fifos = 1