[LTP] [PATCH] containers: Use raw setns syscall for versions of glibc that don't include it

[LTP] [PATCH] containers: Use raw setns syscall for versions of glibc that don't include it

[Hangbin Liu]

On RHEL6.6, the kernel support setns syscall, but glibc(2.12) does not support
this syscall. Thus ltp build failed with "userns04.c:58: undefined reference
to `setns'". Use raw setns syscall to make ltp build pass.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 testcases/kernel/containers/userns/userns_helper.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/testcases/kernel/containers/userns/userns_helper.h b/testcases/kernel/containers/userns/userns_helper.h
index da03bae..9107886 100644
--- a/testcases/kernel/containers/userns/userns_helper.h
+++ b/testcases/kernel/containers/userns/userns_helper.h
@@ -15,6 +15,19 @@
 #include "test.h"
 #include "safe_macros.h"
 
+/*
+ * Use raw setns syscall for versions of glibc that don't include it (namely
+ * glibc-2.12)
+ */
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 14
+#ifdef SYS_setns
+int setns(int fd, int nstype)
+{
+	return syscall(SYS_setns, fd, nstype);
+}
+#endif
+#endif
+
 static int dummy_child(void *v)
 {
 	(void) v;
-- 
1.9.3


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Re: [LTP] [PATCH] containers: Use raw setns syscall for versions of glibc that don't include it

[Jan Stancek]

----- Original Message -----
> From: "Hangbin Liu" <liuhangbin@gmail.com>
> To: "LTP List" <ltp-list@lists.sourceforge.net>
> Sent: Tuesday, 30 June, 2015 8:18:45 AM
> Subject: [LTP] [PATCH] containers: Use raw setns syscall for versions of	glibc that don't include it
> 
> On RHEL6.6, the kernel support setns syscall, but glibc(2.12) does not
> support
> this syscall. Thus ltp build failed with "userns04.c:58: undefined reference
> to `setns'". Use raw setns syscall to make ltp build pass.
> 
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
> ---
>  testcases/kernel/containers/userns/userns_helper.h | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/testcases/kernel/containers/userns/userns_helper.h
> b/testcases/kernel/containers/userns/userns_helper.h
> index da03bae..9107886 100644
> --- a/testcases/kernel/containers/userns/userns_helper.h
> +++ b/testcases/kernel/containers/userns/userns_helper.h
> @@ -15,6 +15,19 @@
>  #include "test.h"
>  #include "safe_macros.h"
>  
> +/*
> + * Use raw setns syscall for versions of glibc that don't include it (namely
> + * glibc-2.12)
> + */
> +#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 14
> +#ifdef SYS_setns
> +int setns(int fd, int nstype)
> +{
> +	return syscall(SYS_setns, fd, nstype);
> +}
> +#endif
> +#endif
> +

This will still fail if SYS_setns is not defined.

We have ltp_syscall and "linux_syscall_numbers.h", which can guaruantee
that __NR_setns will be defined and ltp_syscall will break with TCONF
in case you get ENOSYS.

So if you add dummy call to setns in setup():
  ltp_syscall(__NR_setns, -1, 0);
you can stop the testcase quite early with TCONF if setns is not supported.

Regards,
Jan

>  static int dummy_child(void *v)
>  {
>  	(void) v;
> --
> 1.9.3
> 
> 
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> GigeNET's Cloud Solutions provide you with the tools and support that
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[LTP] [PATCH] containers: Use raw setns syscall for versions of glibc that don't include it

[Hangbin Liu]

The setns() system call was added to glibc in version 2.14. On systems with
lower version glic, like RHEL6.6 glibc 2.12, ltp will build failed with
error "userns04.c:58: undefined reference to `setns'". Use ltp_syscall to make
build pass.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 testcases/kernel/containers/userns/userns_helper.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/testcases/kernel/containers/userns/userns_helper.h b/testcases/kernel/containers/userns/userns_helper.h
index da03bae..21e5cb8 100644
--- a/testcases/kernel/containers/userns/userns_helper.h
+++ b/testcases/kernel/containers/userns/userns_helper.h
@@ -15,6 +15,16 @@
 #include "test.h"
 #include "safe_macros.h"
 
+/*
+ * Use raw setns syscall for versions of glibc that don't include it
+ */
+#if __GLIBC__ <= 2 && __GLIBC_MINOR__ < 14
+int setns(int fd, int nstype)
+{
+	return ltp_syscall(__NR_setns, fd, nstype);
+}
+#endif
+
 static int dummy_child(void *v)
 {
 	(void) v;
-- 
1.9.3


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Re: [LTP] [PATCH] containers: Use raw setns syscall for versions of glibc that don't include it

[Cyril Hrubis]

Hi!
> diff --git a/testcases/kernel/containers/userns/userns_helper.h b/testcases/kernel/containers/userns/userns_helper.h
> index da03bae..21e5cb8 100644
> --- a/testcases/kernel/containers/userns/userns_helper.h
> +++ b/testcases/kernel/containers/userns/userns_helper.h
> @@ -15,6 +15,16 @@
>  #include "test.h"
>  #include "safe_macros.h"
>  
> +/*
> + * Use raw setns syscall for versions of glibc that don't include it
> + */
> +#if __GLIBC__ <= 2 && __GLIBC_MINOR__ < 14
> +int setns(int fd, int nstype)
> +{
> +	return ltp_syscall(__NR_setns, fd, nstype);
> +}
> +#endif

I would rather see this as configure check. Simple
AC_CHECK_FUNCS([setns]) would do, then we can use #ifndef HAVE_SETNS in
the source after we include config.h.

-- 
Cyril Hrubis
chrubis@suse.cz

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