error: missing syscalls when compiling kernel module

[Kapil Mathur]

Replace PWD=$(pwd) with PWD=$(shell pwd)

On Mon, Feb 16, 2015 at 1:53 PM, Paul Bolle <pebolle at tiscali.nl> wrote:

> On Mon, 2015-02-16 at 12:14 +0530, noyb noybee wrote:
> > Hi all. This is the error that I am getting when I try to compile a
> > loadable module(it tries to intercept a system call by directly
> > editing the sys_call_table in the memory):-
> >
> > make -C /lib/modules/2.6.32-504.1.3.el6.x86_64/build M= modules
> > make[1]: Entering directory `/usr/src/kernels/2.6.32-504.1.3.el6.x86_64'
> > make[2]: Nothing to be done for `all'.
> >   CHK     include/linux/version.h
> >   CHK     include/linux/utsrelease.h
> >   SYMLINK include/asm -> include/asm-x86
> > make[2]: *** No rule to make target `missing-syscalls'.  Stop.
> > make[1]: *** [prepare0] Error 2
> > make[1]: Leaving directory `/usr/src/kernels/2.6.32-504.1.3.el6.x86_64'
> > make: *** [all] Error 2
> >
> > The Makefile is:-
> >
> > obj-m   +:= hijack.o
>
> You want ":=" here. "+:=" gives
>     Makefile:1: *** empty variable name.  Stop.
>
> when I try it.
>
> > PWD    := $(pwd)
>
> I think this line sets the value of variable PWD to the value of the
> variable pwd, which is probably empty. Look at "M=" in the output you
> quoted above.
>
> > all:
> >         make -C /lib/modules/2.6.32-504.1.3.el6.x86_64/build M=$(PWD)
> modules
> > clean:
> >         make -C /lib/modules/2.6.32-504.1.3.el6.x86_64/build M=$(PWD)
> clean
> >
> > I have googled the error but most links are unresolved. I am trying to
> > install this against the currently running kernel and not the complete
> > source.
>
> I'm not sure what you're trying to do here, and I'm not really
> comfortable reading Makefiles. But the examples in "3. Creating a Kbuild
> File for an External Module" in Documentation/kbuild/modules.txt suggest
> you could also drop the assignment to PWD and use 'M=$$PWD' in those two
> lines.
>
> Hope this helps,
>
>
> Paul Bolle
>
>
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