linux-kernel - Re: [PATCH] selftests/seccomp: fix build on older kernels

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Date:   Fri, 30 Aug 2019 09:31:35 -0600
From:   Tycho Andersen <tycho@...ho.ws>
To:     shuah <shuah@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alakesh Haloi <alakesh.haloi@...il.com>
Subject: Re: [PATCH] selftests/seccomp: fix build on older kernels

On Fri, Aug 30, 2019 at 09:19:00AM -0600, shuah wrote:
> On 8/29/19 6:45 PM, shuah wrote:
> > On 8/29/19 11:06 AM, Kees Cook wrote:
> > > On Mon, Aug 26, 2019 at 08:43:02AM -0600, Tycho Andersen wrote:
> > > > The seccomp selftest goes to some length to build against older kernel
> > > > headers, viz. all the #ifdefs at the beginning of the file. 201766a20e30
> > > > ("ptrace: add PTRACE_GET_SYSCALL_INFO request") introduces some
> > > > additional
> > > > macros, but doesn't do the #ifdef dance. Let's add that dance here to
> > > > avoid:
> > > > 
> > > > gcc -Wl,-no-as-needed -Wall  seccomp_bpf.c -lpthread -o seccomp_bpf
> > > > In file included from seccomp_bpf.c:51:
> > > > seccomp_bpf.c: In function ‘tracer_ptrace’:
> > > > seccomp_bpf.c:1787:20: error: ‘PTRACE_EVENTMSG_SYSCALL_ENTRY’
> > > > undeclared (first use in this function); did you mean
> > > > ‘PTRACE_EVENT_CLONE’?
> > > >    EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
> > > >                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > ../kselftest_harness.h:608:13: note: in definition of macro ‘__EXPECT’
> > > >    __typeof__(_expected) __exp = (_expected); \
> > > >               ^~~~~~~~~
> > > > seccomp_bpf.c:1787:2: note: in expansion of macro ‘EXPECT_EQ’
> > > >    EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
> > > >    ^~~~~~~~~
> > > > seccomp_bpf.c:1787:20: note: each undeclared identifier is
> > > > reported only once for each function it appears in
> > > >    EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
> > > >                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > ../kselftest_harness.h:608:13: note: in definition of macro ‘__EXPECT’
> > > >    __typeof__(_expected) __exp = (_expected); \
> > > >               ^~~~~~~~~
> > > > seccomp_bpf.c:1787:2: note: in expansion of macro ‘EXPECT_EQ’
> > > >    EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
> > > >    ^~~~~~~~~
> > > > seccomp_bpf.c:1788:6: error: ‘PTRACE_EVENTMSG_SYSCALL_EXIT’
> > > > undeclared (first use in this function); did you mean
> > > > ‘PTRACE_EVENT_EXIT’?
> > > >      : PTRACE_EVENTMSG_SYSCALL_EXIT, msg);
> > > >        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > ../kselftest_harness.h:608:13: note: in definition of macro ‘__EXPECT’
> > > >    __typeof__(_expected) __exp = (_expected); \
> > > >               ^~~~~~~~~
> > > > seccomp_bpf.c:1787:2: note: in expansion of macro ‘EXPECT_EQ’
> > > >    EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
> > > >    ^~~~~~~~~
> > > > make: *** [Makefile:12: seccomp_bpf] Error 1
> > > > 
> > > > Signed-off-by: Tycho Andersen <tycho@...ho.ws>
> > > > Fixes: 201766a20e30 ("ptrace: add PTRACE_GET_SYSCALL_INFO request")
> > > 
> > > Acked-by: Kees Cook <keescook@...omium.org>
> > > 
> > > Alakesh Haloi also sent a fix[1] for this. I prefer Tycho's solution
> > > (one #ifndef and a Fixes line). Shuah, can you please apply this?
> > > 
> > 
> > Kees,
> > 
> > Yes I will pick this up.
> > 
> > thanks,
> > -- Shuah
> > 
> 
> Applied after fixing the following checkpatch error in the commit log:
> 
> ERROR: Please use git commit description style 'commit <12+ chars of sha1>
> ("<title line>")' - ie: 'commit 201766a20e30 ("ptrace: add
> PTRACE_GET_SYSCALL_INFO request")'
> #82:
> 
> Now reads as follows:
> 
> Commit 201766a20e30 ("ptrace: add PTRACE_GET_SYSCALL_INFO request")
>     introduces some additional macros, but doesn't do the #ifdef dance.
>     Let's add that dance here to avoid:

Ah, good to know. Thanks!

Tycho