diff options
| author | Brent Cook <bcook@openbsd.org> | 2014-07-21 18:25:54 -0500 |
|---|---|---|
| committer | Brent Cook <bcook@openbsd.org> | 2014-07-21 19:54:21 -0500 |
| commit | 23dc97f8c2543cf67881dd6d4a351e95318637db (patch) | |
| tree | b4bd77c9d4762331da593cae2743942d06238c42 /tests/pidwraptest.c | |
| parent | f425f564d5062fdc3f7a0d15c7cc5c36a1723abd (diff) | |
| download | portable-23dc97f8c2543cf67881dd6d4a351e95318637db.tar.gz portable-23dc97f8c2543cf67881dd6d4a351e95318637db.tar.bz2 portable-23dc97f8c2543cf67881dd6d4a351e95318637db.zip | |
rename local tests to end in test.c
ok beck@ guenther@
Diffstat (limited to 'tests/pidwraptest.c')
| -rw-r--r-- | tests/pidwraptest.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/tests/pidwraptest.c b/tests/pidwraptest.c new file mode 100644 index 0000000..75f2cc2 --- /dev/null +++ b/tests/pidwraptest.c | |||
| @@ -0,0 +1,81 @@ | |||
| 1 | /* | ||
| 2 | * Checks if LibreSSL's PRNG is fork-safe on Linux. | ||
| 3 | * From https://www.agwa.name/blog/post/libressls_prng_is_unsafe_on_linux | ||
| 4 | */ | ||
| 5 | |||
| 6 | #include <openssl/rand.h> | ||
| 7 | #include <stdio.h> | ||
| 8 | #include <stdlib.h> | ||
| 9 | #include <unistd.h> | ||
| 10 | #include <sys/wait.h> | ||
| 11 | |||
| 12 | static void random_bytes (unsigned char* p, size_t len) | ||
| 13 | { | ||
| 14 | if (RAND_bytes(p, len) != 1) { | ||
| 15 | fprintf(stderr, "RAND_bytes failed\n"); | ||
| 16 | abort(); | ||
| 17 | } | ||
| 18 | } | ||
| 19 | |||
| 20 | static void random_stir (void) | ||
| 21 | { | ||
| 22 | if (RAND_poll() != 1) { | ||
| 23 | fprintf(stderr, "RAND_poll failed\n"); | ||
| 24 | abort(); | ||
| 25 | } | ||
| 26 | } | ||
| 27 | |||
| 28 | static void print_buffer (unsigned char* p, size_t len) | ||
| 29 | { | ||
| 30 | while (len--) { | ||
| 31 | printf("%02x", (unsigned int)*p++); | ||
| 32 | } | ||
| 33 | } | ||
| 34 | |||
| 35 | int main () | ||
| 36 | { | ||
| 37 | char c = 0; | ||
| 38 | int pipefd[2]; | ||
| 39 | pipe(pipefd); | ||
| 40 | setbuf(stdout, NULL); | ||
| 41 | |||
| 42 | if (fork() == 0) { | ||
| 43 | unsigned char buffer[32]; | ||
| 44 | pid_t grandparent_pid = getpid(); | ||
| 45 | |||
| 46 | random_bytes(buffer, sizeof(buffer)); | ||
| 47 | |||
| 48 | if (fork() == 0) { | ||
| 49 | random_stir(); | ||
| 50 | setsid(); | ||
| 51 | while (1) { | ||
| 52 | pid_t grandchild_pid = fork(); | ||
| 53 | if (grandchild_pid == 0) { | ||
| 54 | random_stir(); | ||
| 55 | if (getpid() == grandparent_pid) { | ||
| 56 | random_bytes(buffer, sizeof(buffer)); | ||
| 57 | print_buffer(buffer, sizeof(buffer)); | ||
| 58 | printf("\n"); | ||
| 59 | } | ||
| 60 | _exit(0); | ||
| 61 | } | ||
| 62 | wait(NULL); | ||
| 63 | if (grandchild_pid == grandparent_pid) { | ||
| 64 | break; | ||
| 65 | } | ||
| 66 | } | ||
| 67 | write(pipefd[1], &c, 1); | ||
| 68 | _exit(0); | ||
| 69 | } | ||
| 70 | |||
| 71 | random_bytes(buffer, sizeof(buffer)); | ||
| 72 | print_buffer(buffer, sizeof(buffer)); | ||
| 73 | printf(" "); | ||
| 74 | _exit(0); | ||
| 75 | } | ||
| 76 | wait(NULL); | ||
| 77 | close(pipefd[1]); | ||
| 78 | read(pipefd[0], &c, 1); | ||
| 79 | return 0; | ||
| 80 | } | ||
| 81 | |||