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From: shuah <shuah@kernel.org>
To: Kees Cook <keescook@chromium.org>
Cc: Tycho Andersen <tycho@tycho.ws>,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
	Alakesh Haloi <alakesh.haloi@gmail.com>, shuah <shuah@kernel.org>
Subject: Re: [PATCH] selftests/seccomp: fix build on older kernels
Date: Thu, 29 Aug 2019 18:45:58 -0600	[thread overview]
Message-ID: <f01c3383-0184-9770-c72e-7fe08b552112@kernel.org> (raw)
In-Reply-To: <201908291003.005EB96606@keescook>

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@tycho.ws>
>> Fixes: 201766a20e30 ("ptrace: add PTRACE_GET_SYSCALL_INFO request")
> 
> Acked-by: Kees Cook <keescook@chromium.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

  reply	other threads:[~2019-08-30  0:46 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-26 14:43 Tycho Andersen
2019-08-29 17:06 ` Kees Cook
2019-08-30  0:45   ` shuah [this message]
2019-08-30 15:19     ` shuah
2019-08-30 15:31       ` Tycho Andersen

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