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authorLaura Abbott <labbott@redhat.com>2017-02-07 03:31:57 +0300
committerKees Cook <keescook@chromium.org>2017-02-07 23:32:52 +0300
commitad21fc4faa2a1f919bac1073b885df9310dbc581 (patch)
tree0e72a0b209f7e84daf6a131bdbc673cd60715037 /Documentation/security
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
downloadlinux-ad21fc4faa2a1f919bac1073b885df9310dbc581.tar.xz
arch: Move CONFIG_DEBUG_RODATA and CONFIG_SET_MODULE_RONX to be common
There are multiple architectures that support CONFIG_DEBUG_RODATA and CONFIG_SET_MODULE_RONX. These options also now have the ability to be turned off at runtime. Move these to an architecture independent location and make these options def_bool y for almost all of those arches. Signed-off-by: Laura Abbott <labbott@redhat.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'Documentation/security')
-rw-r--r--Documentation/security/self-protection.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/security/self-protection.txt b/Documentation/security/self-protection.txt
index 3010576c9fca..f41dd00e8b98 100644
--- a/Documentation/security/self-protection.txt
+++ b/Documentation/security/self-protection.txt
@@ -56,6 +56,12 @@ CONFIG_DEBUG_SET_MODULE_RONX, which seek to make sure that code is not
writable, data is not executable, and read-only data is neither writable
nor executable.
+Most architectures have these options on by default and not user selectable.
+For some architectures like arm that wish to have these be selectable,
+the architecture Kconfig can select ARCH_OPTIONAL_KERNEL_RWX to enable
+a Kconfig prompt. CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT determines
+the default setting when ARCH_OPTIONAL_KERNEL_RWX is enabled.
+
#### Function pointers and sensitive variables must not be writable
Vast areas of kernel memory contain function pointers that are looked