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

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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>
This commit is contained in:
Pu Lehui 2025-05-29 15:56:50 +00:00 committed by Andrew Morton
parent 6fb6223347
commit efe99fabeb
1 changed files with 43 additions and 0 deletions
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43
tools/testing/selftests/mm/merge.c
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@ -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