| 1 | // RUN: %clang_safestack -fno-stack-protector -D_FORTIFY_SOURCE=0 -g %s -o %t.nossp |
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| 2 | // RUN: %run %t.nossp 2>&1 | FileCheck --check-prefix=NOSSP %s |
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| 3 | |
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| 4 | // RUN: %clang_safestack -fstack-protector-all -D_FORTIFY_SOURCE=0 -g %s -o %t.ssp |
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| 5 | // RUN: env LIBC_FATAL_STDERR_=1 not --crash %run %t.ssp 2>&1 | \ |
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| 6 | // RUN: FileCheck -check-prefix=SSP %s |
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| 7 | |
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| 8 | // Test stack canaries on the unsafe stack. |
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| 9 | |
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| 10 | // REQUIRES: stable-runtime |
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| 11 | |
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| 12 | #include <assert.h> |
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| 13 | #include <stdio.h> |
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| 14 | #include <string.h> |
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| 15 | |
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| 16 | __attribute__((noinline)) void f(unsigned *y) { |
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| 17 | char x; |
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| 18 | char *volatile p = &x; |
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| 19 | char *volatile q = (char *)y; |
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| 20 | assert(p < q); |
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| 21 | assert(q - p < 1024); // sanity |
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| 22 | // This has technically undefined behavior, but we know the actual layout of |
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| 23 | // the unsafe stack and this should not touch anything important. |
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| 24 | memset(s: &x, c: 0xab, n: q - p + sizeof(*y)); |
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| 25 | } |
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| 26 | |
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| 27 | int main(int argc, char **argv) |
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| 28 | { |
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| 29 | unsigned y; |
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| 30 | // NOSSP: main 1 |
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| 31 | // SSP: main 1 |
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| 32 | fprintf(stderr, format: "main 1\n" ); |
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| 33 | f(y: &y); |
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| 34 | // NOSSP: main 2 |
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| 35 | // SSP-NOT: main 2 |
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| 36 | fprintf(stderr, format: "main 2\n" ); |
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| 37 | return 0; |
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| 38 | } |
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| 39 | |
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