1 | /* Basic test to make sure doing a longjmp to a jmpbuf with an invalid sp |
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2 | is caught by the fortification code. */ |
3 | #include <errno.h> |
4 | #include <fcntl.h> |
5 | #include <paths.h> |
6 | #include <setjmp.h> |
7 | #include <signal.h> |
8 | #include <stdbool.h> |
9 | #include <stdio.h> |
10 | #include <stdlib.h> |
11 | #include <unistd.h> |
12 | |
13 | |
14 | static int do_test(void); |
15 | #define TEST_FUNCTION do_test () |
16 | #include "../test-skeleton.c" |
17 | |
18 | |
19 | static jmp_buf b; |
20 | |
21 | |
22 | static void |
23 | __attribute__ ((noinline)) |
24 | f (void) |
25 | { |
26 | char buf[1000]; |
27 | asm volatile ("": "=m"(buf)); |
28 | |
29 | if (setjmp (b) != 0) |
30 | { |
31 | puts (s: "second longjmp succeeded"); |
32 | exit (1); |
33 | } |
34 | } |
35 | |
36 | |
37 | static bool expected_to_fail; |
38 | |
39 | |
40 | static void |
41 | handler (int sig) |
42 | { |
43 | if (expected_to_fail) |
44 | _exit (0); |
45 | else |
46 | { |
47 | static const char msg[] = "unexpected longjmp failure\n"; |
48 | TEMP_FAILURE_RETRY (write (STDOUT_FILENO, msg, sizeof (msg) - 1)); |
49 | _exit (1); |
50 | } |
51 | } |
52 | |
53 | |
54 | static int |
55 | do_test (void) |
56 | { |
57 | set_fortify_handler (handler); |
58 | |
59 | |
60 | expected_to_fail = false; |
61 | |
62 | if (setjmp (b) == 0) |
63 | { |
64 | longjmp (env: b, val: 1); |
65 | /* NOTREACHED */ |
66 | printf (format: "first longjmp returned\n"); |
67 | return 1; |
68 | } |
69 | |
70 | |
71 | expected_to_fail = true; |
72 | |
73 | f (); |
74 | longjmp (env: b, val: 1); |
75 | |
76 | puts (s: "second longjmp returned"); |
77 | return 1; |
78 | } |
79 |