[BUG] selftests: af_unix: unix:diag.c does not compile on AlmaLinux 8.7
From: Mirsad Todorovac
Date: Mon May 22 2023 - 11:32:23 EST
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@pc-mtodorov linux_torvalds]$ cd tools/testing/selftests/net/af_unix/
[marvin@pc-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@pc-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?)
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