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authorSeth Jennings <sjenning@redhat.com>2014-12-16 11:58:19 -0600
committerJiri Kosina <jkosina@suse.cz>2014-12-22 15:40:49 +0100
commitb700e7f03df5d92f85fa5247fe1f557528d3363d (patch)
treed6da8186d1bd9c42bbd5db9f23deeb1e47bb6dec /kernel/livepatch/Kconfig
parentc5f4546593e9911800f0926c1090959b58bc5c93 (diff)
downloadlinux-b700e7f03df5d92f85fa5247fe1f557528d3363d.tar.bz2
livepatch: kernel: add support for live patching
This commit introduces code for the live patching core. It implements an ftrace-based mechanism and kernel interface for doing live patching of kernel and kernel module functions. It represents the greatest common functionality set between kpatch and kgraft and can accept patches built using either method. This first version does not implement any consistency mechanism that ensures that old and new code do not run together. In practice, ~90% of CVEs are safe to apply in this way, since they simply add a conditional check. However, any function change that can not execute safely with the old version of the function can _not_ be safely applied in this version. [ jkosina@suse.cz: due to the number of contributions that got folded into this original patch from Seth Jennings, add SUSE's copyright as well, as discussed via e-mail ] Signed-off-by: Seth Jennings <sjenning@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Petr Mladek <pmladek@suse.cz> Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Petr Mladek <pmladek@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'kernel/livepatch/Kconfig')
-rw-r--r--kernel/livepatch/Kconfig18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/livepatch/Kconfig b/kernel/livepatch/Kconfig
new file mode 100644
index 000000000000..96da00fbc120
--- /dev/null
+++ b/kernel/livepatch/Kconfig
@@ -0,0 +1,18 @@
+config ARCH_HAVE_LIVE_PATCHING
+ boolean
+ help
+ Arch supports kernel live patching
+
+config LIVE_PATCHING
+ boolean "Kernel Live Patching"
+ depends on DYNAMIC_FTRACE_WITH_REGS
+ depends on MODULES
+ depends on SYSFS
+ depends on KALLSYMS_ALL
+ depends on ARCH_HAVE_LIVE_PATCHING
+ help
+ Say Y here if you want to support kernel live patching.
+ This option has no runtime impact until a kernel "patch"
+ module uses the interface provided by this option to register
+ a patch, causing calls to patched functions to be redirected
+ to new function code contained in the patch module.