From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Date: Sat, 30 Jan 2010 12:51:23 -0800
Subject: [PATCH 2/6] eclone-2: Ensure eclone() fails if selected pid is in use
Ensure that eclone() system call fails with -EBUSY if selected pid is in use.
Changelog[v2]:
- Use libeclone.a from user-cr git tree so tests are portable across
architectures.
- Fix a few nits identified by Serge Hallyn
Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
---
eclone/Makefile | 2 +-
eclone/eclone-2.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 117 insertions(+), 1 deletions(-)
create mode 100644 eclone/eclone-2.c
diff --git a/eclone/Makefile b/eclone/Makefile
index 10b63d3..91aaffc 100644
--- a/eclone/Makefile
+++ b/eclone/Makefile
@@ -10,7 +10,7 @@ LDFLAGS =
LIB_ECLONE = $(USER_CR_DIR)/libeclone.a
-PROGS = eclone-1
+PROGS = eclone-1 eclone-2
all: $(PROGS)
diff --git a/eclone/eclone-2.c b/eclone/eclone-2.c
new file mode 100644
index 0000000..5641247
--- /dev/null
+++ b/eclone/eclone-2.c
@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/syscall.h>
+#include "eclone-tests.h"
+#include "genstack.h"
+
+/*
+ * Verify that eclone() fails if the selected pid is in use.
+ * We try to assign parent's pid which should already be in use.
+ */
+int verbose = 0;
+int child_tid, parent_tid;
+#define CHILD_ARG (void *)0x979797
+
+pid_t pids[2];
+
+int do_child(void *arg)
+{
+ printf("FAIL: Child created with [%d, %d], but we expected child "
+ "creation to fail since pid is in use\n", gettid(),
+ getpid());
+ exit(2);
+}
+
+static int do_eclone(int (*child_fn)(void *), void *child_arg,
+ unsigned int flags_low, int nr_pids, pid_t *pids)
+{
+ int rc;
+ void *stack;
+ struct clone_args clone_args;
+
+ stack = genstack_alloc(STACKSIZE);
+ if (!stack) {
+ printf("ERROR: genstack_alloc() returns NULL for size %d\n",
+ STACKSIZE);
+ exit(1);
+ }
+
+ memset(&clone_args, 0, sizeof(clone_args));
+ clone_args.child_stack = (u64)(int)genstack_sp(stack);
+ clone_args.child_stack_size = (u64)0;
+ clone_args.parent_tid_ptr = (u64)((int)&parent_tid);
+ clone_args.child_tid_ptr = (u64)((int)&child_tid);
+ clone_args.nr_pids = nr_pids;
+
+ if (verbose) {
+ printf("[%d, %d]: Parent:\n\t child_stack 0x%p, ptidp %llx, "
+ "ctidp %llx, pids %p\n", getpid(), gettid(),
+ stack, clone_args.parent_tid_ptr,
+ clone_args.child_tid_ptr, pids);
+ }
+
+ rc = eclone(child_fn, child_arg, flags_low, &clone_args, pids);
+
+ if (verbose) {
+ printf("[%d, %d]: eclone() returned %d, error %d\n", getpid(),
+ gettid(), rc, errno);
+ fflush(stdout);
+ }
+
+ if (rc < 0 && errno == EAGAIN) {
+ printf("PASS: Unable to create a process with a pid that is "
+ "in use\n");
+ exit(0);
+ } else {
+ printf("ERROR: eclone(): rc %d, errno %d\n", rc, errno);
+ return rc;
+ }
+}
+
+int main()
+{
+ int rc, pid, status;
+ unsigned long flags;
+ int nr_pids;
+
+ flags = SIGCHLD;
+
+ /*
+ * Try to create a process with same pid as parent !
+ */
+ pids[0] = getpid();
+ nr_pids = 1;
+
+ pid = do_eclone(do_child, CHILD_ARG, flags, nr_pids, pids);
+
+ if (verbose) {
+ printf("[%d, %d]: Parent waiting for %d\n", getpid(),
+ gettid(), pid);
+ }
+
+ rc = waitpid(pid, &status, __WALL);
+ if (rc < 0) {
+ printf("ERROR: ");
+ verbose = 1;
+ }
+
+ if (verbose) {
+ printf("\twaitpid(): child %d, rc %d, error %d, status 0x%x\n",
+ getpid(), rc, errno, status);
+ if (rc >=0) {
+ if (WIFEXITED(status)) {
+ printf("\t EXITED, %d\n", WEXITSTATUS(status));
+ } else if (WIFSIGNALED(status)) {
+ printf("\t SIGNALED, %d\n", WTERMSIG(status));
+ }
+ }
+ }
+ return 0;
+}
--
1.6.6.1
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