[LTP] [PATCH] [PATCH] [V2] Migrating the libhugetlbfs/testcases/ptrace-write-hugepage.c

[Pavithra]

Changed testcase to use new API

Signed-off-by: Pavithra <pavrampu@linux.ibm.com>
---
 runtest/hugetlb                               |   1 +
 testcases/kernel/mem/.gitignore               |   1 +
 .../kernel/mem/hugetlb/hugemmap/hugemmap41.c  | 147 ++++++++++++++++++
 3 files changed, 149 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap41.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 0896d3c94..14ca64018 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -36,6 +36,7 @@ hugemmap30 hugemmap30
 hugemmap31 hugemmap31
 hugemmap32 hugemmap32
 hugemmap34 hugemmap34
+hugemmap41 hugemmap41
 hugemmap05_1 hugemmap05 -m
 hugemmap05_2 hugemmap05 -s
 hugemmap05_3 hugemmap05 -s -m
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index b4455de51..4bd7481b0 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -36,6 +36,7 @@
 /hugetlb/hugemmap/hugemmap31
 /hugetlb/hugemmap/hugemmap32
 /hugetlb/hugemmap/hugemmap34
+/hugetlb/hugemmap/hugemmap41
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap41.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap41.c
new file mode 100644
index 000000000..3ea6d9e75
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap41.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
+ */
+
+/*\
+ * [Description]
+ *
+ * Test ptrace write to hugepage memory.
+ * This test verifies that ptrace POKEDATA and PEEKDATA work correctly
+ * on hugepage-backed memory regions.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/ptrace.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "tst_test.h"
+#include "hugetlb.h"
+
+#define CONST	0xdeadbeefL
+#define MNTPOINT "hugetlbfs/"
+
+static long hpage_size;
+static volatile int ready_to_trace;
+static int fd = -1;
+
+static void sigchld_handler(int signum, siginfo_t *si, void *uc)
+{
+	int status;
+
+	wait(&status);
+	if (WIFEXITED(status))
+		exit(WEXITSTATUS(status));
+	else if (WIFSIGNALED(status))
+		exit(status);
+
+	ready_to_trace = 1;
+}
+
+static void child(int hugefd, int pipefd)
+{
+	void *p;
+
+	p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+		      hugefd, 0);
+
+	memset(p, 0, hpage_size);
+
+	tst_res(TINFO, "Child mapped data at %p", p);
+
+	SAFE_WRITE(SAFE_WRITE_ALL, pipefd, &p, sizeof(p));
+
+	pause();
+}
+
+static void do_poke(pid_t pid, void *p)
+{
+	long err;
+
+	tst_res(TINFO, "Poking at %p...", p);
+	err = ptrace(PTRACE_POKEDATA, pid, p, (void *)CONST);
+	if (err)
+		tst_brk(TFAIL | TERRNO, "ptrace(POKEDATA) failed");
+
+	tst_res(TINFO, "Peeking at %p...", p);
+	errno = 0;
+	err = ptrace(PTRACE_PEEKDATA, pid, p, NULL);
+	if (err == -1 && errno)
+		tst_brk(TFAIL | TERRNO, "ptrace(PEEKDATA) failed");
+
+	if (err != CONST)
+		tst_brk(TFAIL, "Value mismatch: got %lx, expected %lx", err, CONST);
+}
+
+static void run_test(void)
+{
+	int pipefd[2];
+	long err;
+	pid_t cpid;
+	void *p;
+	int signal;
+
+	struct sigaction sa = {
+		.sa_sigaction = sigchld_handler,
+		.sa_flags = SA_SIGINFO,
+	};
+	struct sigaction old_sa;
+
+	hpage_size = tst_get_hugepage_size();
+	fd = tst_creat_unlinked(MNTPOINT, 0, 0600);
+
+	SAFE_SIGACTION(SIGCHLD, &sa, &old_sa);
+	SAFE_PIPE(pipefd);
+
+	cpid = SAFE_FORK();
+
+	if (cpid == 0) {
+		child(fd, pipefd[1]);
+		exit(0);
+	}
+
+	/* Parent */
+	SAFE_READ(1, pipefd[0], &p, sizeof(p));
+
+	tst_res(TINFO, "Parent received address %p", p);
+
+	err = ptrace(PTRACE_ATTACH, cpid, NULL, NULL);
+	if (err)
+		tst_brk(TFAIL | TERRNO, "ptrace(ATTACH) failed");
+
+	while (!ready_to_trace)
+		;
+
+	do_poke(cpid, p);
+	do_poke(cpid, p + getpagesize());
+
+	SAFE_SIGACTION(SIGCHLD, &old_sa, NULL);
+
+	SAFE_PTRACE(PTRACE_KILL, cpid, NULL, NULL);
+	SAFE_WAITPID(cpid, &signal, 0);
+
+	tst_res(TPASS, "ptrace write to hugepage succeeded");
+}
+
+static void cleanup(void)
+{
+	if (fd >= 0)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.tags = (struct tst_tag[]) {
+		{"linux-git", "ebed4bfc8da8"},
+		{}
+	},
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.hugepages = {4, TST_NEEDS},
+	.forks_child = 1,
+	.cleanup = cleanup,
+	.test_all = run_test,
+};
-- 
2.53.0