[LTP] [PATCH v1 2/4] syscalls/shmget*: Convert into new api

[xuyang2018.jy@fujitsu.com]

Hi ALL
> 1) merge shmget05.c into shmget02.c
> 2) Use SHMMIN -1 and SHMMAX + 1 to trigger EINVAL error
> 3) Use SHM_RD, SHM_WR, SHM_RW to trigger EACCES error under unpriviledged user

Sorry for missing EPERM error in shmget02.c(I will add it in v2 when you
have comment on rest patches)

diff --git a/testcases/kernel/syscalls/ipc/shmget/shmget02.c
b/testcases/kernel/syscalls/ipc/shmget/shmget02.c
index a57904ce9..319d1e972 100644
--- a/testcases/kernel/syscalls/ipc/shmget/shmget02.c
+++ b/testcases/kernel/syscalls/ipc/shmget/shmget02.c
@@ -17,6 +17,9 @@
  * greater than SHMMAX. Or a segment for the given key exists, but size is
  * greater than the size of that segment.
  * EACCES - The user does not have permission to access the shared
memory segment.
+ * EPERM - The SHM_HUGETLB flag was specified, but the caller was not
privileged
+ * (did not have the CAP_IPC_LOCK capability). Also the caller's group
id should
+ * be not in hugetlb_shm_group proc file.
  */
 #include <errno.h>
 #include <sys/types.h>
@@ -47,6 +50,7 @@ static struct tcase {
        {&shmkey1, SHMMAX + 1, IPC_CREAT | IPC_EXCL, 0, EINVAL},
        {&shmkey, SHM_SIZE * 2, IPC_EXCL, 0, EINVAL},
        {&shmkey, SHM_SIZE, SHM_RD, 1, EACCES},
+       {&shmkey1, SHM_SIZE, IPC_CREAT | SHM_HUGETLB, 1, EPERM}
 };

 static void verify_shmget(struct tcase *tc)
@@ -91,6 +95,7 @@ static void setup(void)
        shmkey = GETIPCKEY();
        shmkey1 = GETIPCKEY();

+       SAFE_FILE_PRINTF("/proc/sys/vm/hugetlb_shm_group", "1");
        shm_id = SAFE_SHMGET(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL);
        pw = SAFE_GETPWNAM("nobody");
        tst_res(TINFO, "%d %d", shmkey, shmkey1);
@@ -110,4 +115,8 @@ static struct tst_test test = {
        .cleanup = cleanup,
        .test = do_test,
        .tcnt = ARRAY_SIZE(tcases),
+       .save_restore = (const char * const[]) {
+                "?/proc/sys/vm/hugetlb_shm_group",
+               NULL,
+       }
 };