stable: clamp SUBLEVEL in 4.4 and 4.9

Right now SUBLEVEL is overflowing, and some userspace may start treating
4.9.256 as 4.10. While out of tree modules have different ways of
  extracting the version number (and we're generally ok with breaking
them), we do care about breaking userspace and it would appear that this
overflow might do just that.

Our rules around userspace ABI in the stable kernel are pretty simple:
we don't break it. Thus, while userspace may be checking major/minor, it
shouldn't be doing anything with sublevel.

This patch applies a big band-aid to the 4.9 and 4.4 kernels in the form
of clamping their sublevel to 255.

The clamp is done for the purpose of LINUX_VERSION_CODE only, and
extracting the version number from the Makefile or "make kernelversion"
will continue to work as intended.

We might need to do it later in newer trees, but maybe we'll have a
better solution by then, so I'm ignoring that problem for now.

Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Makefile b/Makefile
index 0057587d2cbe277dd526139c2135ad795fe9f295..e4c6b6e62edb98e701a8b1c380cd4e9854a79f41 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1068,7 +1068,7 @@ endef
 
 define filechk_version.h
        (echo \#define LINUX_VERSION_CODE $(shell                         \
-       expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
+       expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 endef