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12#define pr_fmt(fmt) "rodata_test: " fmt
13
14#include <linux/uaccess.h>
15#include <asm/sections.h>
16
17static const int rodata_test_data = 0xC3;
18
19void rodata_test(void)
20{
21 unsigned long start, end;
22 int zero = 0;
23
24
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26 if (!rodata_test_data) {
27 pr_err("test 1 fails (start data)\n");
28 return;
29 }
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31
32 if (!probe_kernel_write((void *)&rodata_test_data,
33 (void *)&zero, sizeof(zero))) {
34 pr_err("test data was not read only\n");
35 return;
36 }
37
38
39 if (rodata_test_data == zero) {
40 pr_err("test data was changed\n");
41 return;
42 }
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44
45 start = (unsigned long)__start_rodata;
46 end = (unsigned long)__end_rodata;
47 if (start & (PAGE_SIZE - 1)) {
48 pr_err("start of .rodata is not page size aligned\n");
49 return;
50 }
51 if (end & (PAGE_SIZE - 1)) {
52 pr_err("end of .rodata is not page size aligned\n");
53 return;
54 }
55
56 pr_info("all tests were successful\n");
57}
58