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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-04-18 16:51:20 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2019-04-21 23:05:57 +1000
commitde78a9c42a790011f179bc94a7da3f5d8721f4cc (patch)
tree462ebea30f53f5f1e61513cbae38e40145ec030a /Documentation
parent0fb1c25ab523614b056ace11be67aac8f8ccabb1 (diff)
downloadlinux-de78a9c42a790011f179bc94a7da3f5d8721f4cc.tar.bz2
powerpc: Add a framework for Kernel Userspace Access Protection
This patch implements a framework for Kernel Userspace Access Protection. Then subarches will have the possibility to provide their own implementation by providing setup_kuap() and allow/prevent_user_access(). Some platforms will need to know the area accessed and whether it is accessed from read, write or both. Therefore source, destination and size and handed over to the two functions. mpe: Rename to allow/prevent rather than unlock/lock, and add read/write wrappers. Drop the 32-bit code for now until we have an implementation for it. Add kuap to pt_regs for 64-bit as well as 32-bit. Don't split strings, use pr_crit_ratelimited(). Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a53df74589e5..c45a19d654f3 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2839,7 +2839,7 @@
noexec=on: enable non-executable mappings (default)
noexec=off: disable non-executable mappings
- nosmap [X86]
+ nosmap [X86,PPC]
Disable SMAP (Supervisor Mode Access Prevention)
even if it is supported by processor.