| 1 | #include "../multiarch/noexec.c.inc" |
| 2 | |
| 3 | static void *arch_mcontext_pc(const mcontext_t *ctx) |
| 4 | { |
| 5 | return (void *)ctx->gregs[REG_RIP]; |
| 6 | } |
| 7 | |
| 8 | int arch_mcontext_arg(const mcontext_t *ctx) |
| 9 | { |
| 10 | return ctx->gregs[REG_RDI]; |
| 11 | } |
| 12 | |
| 13 | static void arch_flush(void *p, int len) |
| 14 | { |
| 15 | } |
| 16 | |
| 17 | extern char noexec_1[]; |
| 18 | extern char noexec_2[]; |
| 19 | extern char noexec_end[]; |
| 20 | |
| 21 | asm("noexec_1:\n" |
| 22 | " movq $1,%rdi\n" /* %rdi is 0 on entry, set 1. */ |
| 23 | "noexec_2:\n" |
| 24 | " movq $2,%rdi\n" /* %rdi is 0/1; set 2. */ |
| 25 | " ret\n" |
| 26 | "noexec_end:"); |
| 27 | |
| 28 | int main(void) |
| 29 | { |
| 30 | struct noexec_test noexec_tests[] = { |
| 31 | { |
| 32 | .name = "fallthrough", |
| 33 | .test_code = noexec_1, |
| 34 | .test_len = noexec_end - noexec_1, |
| 35 | .page_ofs = noexec_1 - noexec_2, |
| 36 | .entry_ofs = noexec_1 - noexec_2, |
| 37 | .expected_si_ofs = 0, |
| 38 | .expected_pc_ofs = 0, |
| 39 | .expected_arg = 1, |
| 40 | }, |
| 41 | { |
| 42 | .name = "jump", |
| 43 | .test_code = noexec_1, |
| 44 | .test_len = noexec_end - noexec_1, |
| 45 | .page_ofs = noexec_1 - noexec_2, |
| 46 | .entry_ofs = 0, |
| 47 | .expected_si_ofs = 0, |
| 48 | .expected_pc_ofs = 0, |
| 49 | .expected_arg = 0, |
| 50 | }, |
| 51 | { |
| 52 | .name = "fallthrough [cross]", |
| 53 | .test_code = noexec_1, |
| 54 | .test_len = noexec_end - noexec_1, |
| 55 | .page_ofs = noexec_1 - noexec_2 - 2, |
| 56 | .entry_ofs = noexec_1 - noexec_2 - 2, |
| 57 | .expected_si_ofs = 0, |
| 58 | .expected_pc_ofs = -2, |
| 59 | .expected_arg = 1, |
| 60 | }, |
| 61 | { |
| 62 | .name = "jump [cross]", |
| 63 | .test_code = noexec_1, |
| 64 | .test_len = noexec_end - noexec_1, |
| 65 | .page_ofs = noexec_1 - noexec_2 - 2, |
| 66 | .entry_ofs = -2, |
| 67 | .expected_si_ofs = 0, |
| 68 | .expected_pc_ofs = -2, |
| 69 | .expected_arg = 0, |
| 70 | }, |
| 71 | }; |
| 72 | |
| 73 | return test_noexec(noexec_tests, |
| 74 | sizeof(noexec_tests) / sizeof(noexec_tests[0])); |
| 75 | } |