linux-kernel - [PATCH v1 4/4] selftests/mm: Add test about uprobe pte be orphan during vma merge

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Message-Id: <20250529155650.4017699-5-pulehui@huaweicloud.com>
Date: Thu, 29 May 2025 15:56:50 +0000
From: Pu Lehui <pulehui@...weicloud.com>
To: mhiramat@...nel.org,
	oleg@...hat.com,
	peterz@...radead.org,
	akpm@...ux-foundation.org,
	Liam.Howlett@...cle.com,
	lorenzo.stoakes@...cle.com,
	vbabka@...e.cz,
	jannh@...gle.com,
	pfalcato@...e.de
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	pulehui@...wei.com
Subject: [PATCH v1 4/4] selftests/mm: Add test about uprobe pte be orphan during vma merge

From: Pu Lehui <pulehui@...wei.com>

Add test about uprobe pte be orphan during vma merge.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
---
 tools/testing/selftests/mm/merge.c | 42 ++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/tools/testing/selftests/mm/merge.c b/tools/testing/selftests/mm/merge.c
index c76646cdf6e6..8e1f38d23384 100644
--- a/tools/testing/selftests/mm/merge.c
+++ b/tools/testing/selftests/mm/merge.c
@@ -2,11 +2,13 @@
 
 #define _GNU_SOURCE
 #include "../kselftest_harness.h"
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/mman.h>
 #include <sys/wait.h>
+#include <linux/perf_event.h>
 #include "vm_util.h"
 
 FIXTURE(merge)
@@ -452,4 +454,44 @@ TEST_F(merge, forked_source_vma)
 	ASSERT_EQ(procmap->query.vma_end, (unsigned long)ptr2 + 5 * page_size);
 }
 
+TEST_F(merge, handle_uprobe_upon_merged_vma)
+{
+	const size_t attr_sz = sizeof(struct perf_event_attr);
+	unsigned int page_size = self->page_size;
+	const char *probe_file = "./foo";
+	char *carveout = self->carveout;
+	struct perf_event_attr attr;
+	unsigned long type;
+	void *ptr1, *ptr2;
+	int fd;
+
+	fd = open(probe_file, O_RDWR|O_CREAT, 0600);
+	ASSERT_GE(fd, 0);
+
+	ASSERT_EQ(ftruncate(fd, page_size), 0);
+	ASSERT_EQ(read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type), 0);
+
+	memset(&attr, 0, attr_sz);
+	attr.size = attr_sz;
+	attr.type = type;
+	attr.config1 = (__u64)(long)probe_file;
+	attr.config2 = 0x0;
+
+	ASSERT_GE(syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0), 0);
+
+	ptr1 = mmap(&carveout[page_size], 10 * page_size, PROT_EXEC,
+		    MAP_PRIVATE | MAP_FIXED, fd, 0);
+	ASSERT_NE(ptr1, MAP_FAILED);
+
+	ptr2 = mremap(ptr1, page_size, 2 * page_size,
+		      MREMAP_MAYMOVE | MREMAP_FIXED, ptr1 + 5 * page_size);
+	ASSERT_NE(ptr2, MAP_FAILED);
+
+	ASSERT_NE(mremap(ptr2, page_size, page_size,
+			 MREMAP_MAYMOVE | MREMAP_FIXED, ptr1), MAP_FAILED);
+
+	close(fd);
+	remove(probe_file);
+}
+
 TEST_HARNESS_MAIN
-- 
2.34.1