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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-15 08:45:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-15 08:45:54 -0700
commit8c479c2c0f9dc105c0afaa662a22f39383d4ce92 (patch)
treec93cddf47d604aab8ca49491cda0a751dd3da002 /Documentation/admin-guide
parent31130a16d459de809cd1c03eabc9567d094aae6a (diff)
parentb5cb15d9372abc9adc4e844c0c1bf594ca6a7695 (diff)
Merge tag 'hardened-usercopy-v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull hardened usercopy updates from Kees Cook: "This cleans up a minor Kconfig issue and adds a kernel boot option for disabling hardened usercopy for distro users that may have corner-case performance issues (e.g. high bandwidth small-packet UDP traffic). Summary: - drop unneeded Kconfig "select BUG" (Kamal Mostafa) - add "hardened_usercopy=off" rare performance needs (Chris von Recklinghausen)" * tag 'hardened-usercopy-v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: usercopy: Allow boot cmdline disabling of hardening usercopy: Do not select BUG with HARDENED_USERCOPY
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f3ade2f6b65b..a32f2a126791 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -816,6 +816,17 @@
disable= [IPV6]
See Documentation/networking/ipv6.txt.
+ hardened_usercopy=
+ [KNL] Under CONFIG_HARDENED_USERCOPY, whether
+ hardening is enabled for this boot. Hardened
+ usercopy checking is used to protect the kernel
+ from reading or writing beyond known memory
+ allocation boundaries as a proactive defense
+ against bounds-checking flaws in the kernel's
+ copy_to_user()/copy_from_user() interface.
+ on Perform hardened usercopy checks (default).
+ off Disable hardened usercopy checks.
+
disable_radix [PPC]
Disable RADIX MMU mode on POWER9