linux-kernel - [PATCH 5/8] mshare: selftests: Add test case ioctl unmap

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Message-Id: <20250825145719.29455-6-linyongting@bytedance.com>
Date: Mon, 25 Aug 2025 22:57:08 +0800
From: Yongting Lin <linyongting@...edance.com>
To: anthony.yznaga@...cle.com,
	khalid@...nel.org,
	shuah@...nel.org,
	linyongting@...edance.com
Cc: linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	akpm@...ux-foundation.org,
	linux-mm@...ck.org
Subject: [PATCH 5/8] mshare: selftests: Add test case ioctl unmap

This test case aims to verify whether the process with guest mm will
segfault when VMA of host mm is unmaped via ioctl(MSHAREFS_UNMAP).

Signed-off-by: Yongting Lin <linyongting@...edance.com>
---
 tools/testing/selftests/mshare/basic.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/testing/selftests/mshare/basic.c b/tools/testing/selftests/mshare/basic.c
index 2347d30adfee..16d1f63c3ebe 100644
--- a/tools/testing/selftests/mshare/basic.c
+++ b/tools/testing/selftests/mshare/basic.c
@@ -85,4 +85,24 @@ TEST_F(basic, shared_mem)
 	ASSERT_EQ(memcmp(addr, STRING, sizeof(STRING)), 0);
 }
 
+TEST_F_SIGNAL(basic, ioctl_unmap, SIGSEGV)
+{
+	char *addr;
+	int fd;
+
+	fd = open(self->filename, O_RDWR, 0600);
+	addr = mmap(NULL, self->allocate_size, PROT_READ | PROT_WRITE,
+			MAP_SHARED, fd, 0);
+	ASSERT_NE(addr, MAP_FAILED);
+	addr[0] = 'M';
+
+	/* munmap vma for host mm */
+	mshare_ioctl_munmap(fd, self->allocate_size);
+	/*
+	 * Will generate SIGSEGV signal as ioctl has already cleaned
+	 * shared page table
+	 */
+	addr[0] = 'D';
+}
+
 TEST_HARNESS_MAIN
-- 
2.20.1