[LTP] [PATCH] acct: fix version check on big endian system

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> On Thu, Oct 10, 2019 at 02:37:50PM +0800, Ping Fang wrote:
> > ac_version = ACCT_VERION | ACCT_BYTEORDER
> > which is 0x83 (131) on big endian system.
> > 
> > failure output:
> > tst_kconfig.c:62: INFO: Parsing kernel config
> > '/boot/config-4.18.0-147.el8.s390x'
> > tst_test.c:1118: INFO: Timeout per run is 0h 05m 00s
> > tst_kconfig.c:62: INFO: Parsing kernel config
> > '/boot/config-4.18.0-147.el8.s390x'
> > acct02.c:239: INFO: Verifying using 'struct acct_v3'
> > acct02.c:192: INFO: == entry 1 ==
> > acct02.c:147: INFO: ac_version != 3 (131)
> > acct02.c:192: INFO: == entry 2 ==
> > acct02.c:82: INFO: ac_comm != 'acct02_helper' ('acct02')
> > acct02.c:133: INFO: ac_exitcode != 32768 (0)
> > acct02.c:141: INFO: ac_ppid != 34501 (34500)
> > acct02.c:147: INFO: ac_version != 3 (131)
> > acct02.c:182: FAIL: end of file reached
> > 
> > Signed-off-by: Ping Fang <pifang@redhat.com>
> > ---
> >  testcases/kernel/syscalls/acct/acct02.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/testcases/kernel/syscalls/acct/acct02.c
> > b/testcases/kernel/syscalls/acct/acct02.c
> > index 7c2a27046..c513b2145 100644
> > --- a/testcases/kernel/syscalls/acct/acct02.c
> > +++ b/testcases/kernel/syscalls/acct/acct02.c
> > @@ -142,7 +142,8 @@ static int verify_acct(void *acc, int elap_time)
> >  		ret = 1;
> >  	}
> >  
> > -	if (ACCT_MEMBER_V3(ac_version) != 3) {
> > +	/* In big endian system accout version have a ACCT_BYTEORDER 0x80 flag*/
> > +	if (ACCT_MEMBER_V3(ac_version) != 3 || ACC_MEMBER_V3(ac_version) != 131)
> > {
> 					    ^^ should be &&.
> >  		tst_res(TINFO, "ac_version != 3 (%d)",
> >  			ACCT_MEMBER_V3(ac_version));
> >  		ret = 1;
> > --
> > 2.21.0

Can we incorporate ACCT_BYTEORDER into that check?

Kernel appears to use it at least since 2.6.12-rc2. We would just need
define it for !HAVE_STRUCT_ACCT_V3 case.

diff --git a/include/lapi/acct.h b/include/lapi/acct.h
index ebd65bbf4df7..112ee48d8aee 100644
--- a/include/lapi/acct.h
+++ b/include/lapi/acct.h
@@ -64,6 +64,13 @@ enum {
        ACORE = 0x08,
        AXSIG = 0x10
 };
+
+# if __BYTE_ORDER == __BIG_ENDIAN
+# define ACCT_BYTEORDER  0x80
+# elif __BYTE_ORDER == __LITTLE_ENDIAN
+# define ACCT_BYTEORDER  0x00
+# endif
+
 #endif /* HAVE_STRUCT_ACCT_V3 */
 
 #endif /* LAPI_ACCT_H */
diff --git a/testcases/kernel/syscalls/acct/acct02.c b/testcases/kernel/syscalls/acct/acct02.c
index 7c2a270465c5..4d95aafec3e1 100644
--- a/testcases/kernel/syscalls/acct/acct02.c
+++ b/testcases/kernel/syscalls/acct/acct02.c
@@ -142,7 +142,7 @@ static int verify_acct(void *acc, int elap_time)
                ret = 1;
        }
 
-       if (ACCT_MEMBER_V3(ac_version) != 3) {
+       if (ACCT_MEMBER_V3(ac_version) != (3 | ACCT_BYTEORDER)) {
                tst_res(TINFO, "ac_version != 3 (%d)",
                        ACCT_MEMBER_V3(ac_version));
                ret = 1;