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