selftests/mm: add test about uprobe pte be orphan during vma merge

Add test about uprobe pte be orphan during vma merge.

[akpm@linux-foundation.org: include sys/syscall.h, per Lorenzo]
Link: https://lkml.kernel.org/r/20250529155650.4017699-5-pulehui@huaweicloud.com
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Cc: Jann Horn <jannh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/mm/merge.c b/tools/testing/selftests/mm/merge.c
index c76646cdf6e6f9bcc431f16a6046f94ae2575004..bbae66fc5038c3ce42bea5afeb9bf98ef54f5d64 100644 (file)
--- a/tools/testing/selftests/mm/merge.c
+++ b/tools/testing/selftests/mm/merge.c
@@ -2,11 +2,14 @@
 
 #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/syscall.h>
 #include <sys/wait.h>
+#include <linux/perf_event.h>
 #include "vm_util.h"
 
 FIXTURE(merge)
@@ -452,4 +455,44 @@ 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