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Date: Mon, 22 May 2023 09:28:43 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <mirsad.todorovac@....unizg.hr>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<kuniyu@...zon.com>, <linux-kernel@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>, <netdev@...r.kernel.org>,
<pabeni@...hat.com>, <shuah@...nel.org>
Subject: Re: [BUG] selftests: af_unix: unix:diag.c does not compile on AlmaLinux 8.7
From: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Date: Mon, 22 May 2023 17:32:11 +0200
> Hi,
>
> On vanilla AlmaLinux 8.7 (CentOS fork) selftests/net/af_unix/diag_uid.c doesn't
> compile out of the box, giving the errors:
>
> make[2]: Entering directory '/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix'
> gcc diag_uid.c -o /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix/diag_uid
> diag_uid.c:36:16: error: ‘UDIAG_SHOW_UID’ undeclared here (not in a function); did you mean ‘UDIAG_SHOW_VFS’?
> .udiag_show = UDIAG_SHOW_UID
> ^~~~~~~~~~~~~~
> UDIAG_SHOW_VFS
> In file included from diag_uid.c:17:
> diag_uid.c: In function ‘render_response’:
> diag_uid.c:128:28: error: ‘UNIX_DIAG_UID’ undeclared (first use in this function); did you mean ‘UNIX_DIAG_VFS’?
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~~~~~
> ../../kselftest_harness.h:707:13: note: in definition of macro ‘__EXPECT’
> __typeof__(_seen) __seen = (_seen); \
> ^~~~~
> diag_uid.c:128:2: note: in expansion of macro ‘ASSERT_EQ’
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~
> diag_uid.c:128:28: note: each undeclared identifier is reported only once for each function it appears in
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~~~~~
> ../../kselftest_harness.h:707:13: note: in definition of macro ‘__EXPECT’
> __typeof__(_seen) __seen = (_seen); \
> ^~~~~
> diag_uid.c:128:2: note: in expansion of macro ‘ASSERT_EQ’
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~
> make[2]: *** [../../lib.mk:147: /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix/diag_uid] Error 1
>
> The correct value is in <uapi/linux/unix_diag.h>:
>
> include/uapi/linux/unix_diag.h:23:#define UDIAG_SHOW_UID 0x00000040 /* show socket's UID */
>
> The fix is as follows:
>
> ---
> tools/testing/selftests/net/af_unix/diag_uid.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tools/testing/selftests/net/af_unix/diag_uid.c b/tools/testing/selftests/net/af_unix/diag_uid.c
> index 5b88f7129fea..66d75b646d35 100644
> --- a/tools/testing/selftests/net/af_unix/diag_uid.c
> +++ b/tools/testing/selftests/net/af_unix/diag_uid.c
> @@ -16,6 +16,10 @@
>
> #include "../../kselftest_harness.h"
>
> +#ifndef UDIAG_SHOW_UID
> +#define UDIAG_SHOW_UID 0x00000040 /* show socket's UID */
> +#endif
> +
> FIXTURE(diag_uid)
> {
> int netlink_fd;
>
> --
>
> However, this patch reveals another undefined value:
>
> make[2]: Entering directory '/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix'
> gcc diag_uid.c -o /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix/diag_uid
> In file included from diag_uid.c:17:
> diag_uid.c: In function ‘render_response’:
> diag_uid.c:132:28: error: ‘UNIX_DIAG_UID’ undeclared (first use in this function); did you mean ‘UNIX_DIAG_VFS’?
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~~~~~
> ../../kselftest_harness.h:707:13: note: in definition of macro ‘__EXPECT’
> __typeof__(_seen) __seen = (_seen); \
> ^~~~~
> diag_uid.c:132:2: note: in expansion of macro ‘ASSERT_EQ’
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~
> diag_uid.c:132:28: note: each undeclared identifier is reported only once for each function it appears in
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~~~~~
> ../../kselftest_harness.h:707:13: note: in definition of macro ‘__EXPECT’
> __typeof__(_seen) __seen = (_seen); \
> ^~~~~
> diag_uid.c:132:2: note: in expansion of macro ‘ASSERT_EQ’
> ASSERT_EQ(attr->rta_type, UNIX_DIAG_UID);
> ^~~~~~~~~
> make[2]: *** [../../lib.mk:147: /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix/diag_uid] Error 1
>
> Apparently, AlmaLinux 8.7 lacks this enum UNIX_DIAG_UID:
>
> diff -u /usr/include/linux/unix_diag.h include/uapi/linux/unix_diag.h
> --- /usr/include/linux/unix_diag.h 2023-05-16 13:47:51.000000000 +0200
> +++ include/uapi/linux/unix_diag.h 2022-10-12 07:35:58.253481367 +0200
> @@ -20,6 +20,7 @@
> #define UDIAG_SHOW_ICONS 0x00000008 /* show pending connections */
> #define UDIAG_SHOW_RQLEN 0x00000010 /* show skb receive queue len */
> #define UDIAG_SHOW_MEMINFO 0x00000020 /* show memory info of a socket */
> +#define UDIAG_SHOW_UID 0x00000040 /* show socket's UID */
>
> struct unix_diag_msg {
> __u8 udiag_family;
> @@ -40,6 +41,7 @@
> UNIX_DIAG_RQLEN,
> UNIX_DIAG_MEMINFO,
> UNIX_DIAG_SHUTDOWN,
> + UNIX_DIAG_UID,
>
> __UNIX_DIAG_MAX,
> };
>
> Now, this is a change in enums and there doesn't seem to an easy way out
> here. (I think I saw an example, but I cannot recall which thread. I will do
> more research.)
>
> When I included
>
> # gcc -I ../../../../include diag_uid.c
>
> I've got the following error:
>
> [marvin@...mtodorov linux_torvalds]$ cd tools/testing/selftests/net/af_unix/
> [marvin@...mtodorov af_unix]$ gcc -I ../../../../../include diag_uid.c -o
> /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/net/af_unix/diag_uid
> In file included from ../../../../../include/linux/build_bug.h:5,
> from ../../../../../include/linux/bits.h:21,
> from ../../../../../include/linux/capability.h:18,
> from ../../../../../include/linux/netlink.h:6,
> from diag_uid.c:8:
> ../../../../../include/linux/compiler.h:246:10: fatal error: asm/rwonce.h: No such file or directory
> #include <asm/rwonce.h>
> ^~~~~~~~~~~~~~
> compilation terminated.
> [marvin@...mtodorov af_unix]$
>
> At this point I gave up, as it would be an overkill to change kernel system
> header to make a test pass, and this probably wouldn't be accepted upsteam?
>
> Hope this helps. (If we still want to build on CentOS/AlmaLinux/Rocky 8?)
I launched AlmaLinux/RockyLinux 8.7 and 9.2 with images listed in the pages
below.
https://wiki.almalinux.org/cloud/AWS.html#community-amis
https://rockylinux.org/cloud-images/
The kernel versions in each image were :
8.7:
Alma : 4.18.0-425.3.1.el8.x86_64
Rocky : 4.18.0-425.10.1.el8_7.x86_64
9.2:
Alma : 5.14.0-284.11.1.el9_2.x86_64
Rocky : 5.14.0-284.11.1.el9_2.x86_64
So, this is not a bug. It's just because v4.18 does not support
UNIX_DIAG_UID, which was introduced in v5.3.
You should install 5.3+ kernel if you want to build the test.
Thanks,
Kuniyuki
>
> Best regards,
> Mirsad
>
> --
> Mirsad Goran Todorovac
> Sistem inženjer
> Grafički fakultet | Akademija likovnih umjetnosti
> Sveučilište u Zagrebu
>
> System engineer
> Faculty of Graphic Arts | Academy of Fine Arts
> University of Zagreb, Republic of Croatia
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