| 1 | // RUN: %clang_analyze_cc1 -triple i686-unknown-linux -analyzer-checker=alpha.security.MmapWriteExec -analyzer-config alpha.security.MmapWriteExec:MmapProtExec=1 -analyzer-config alpha.security.MmapWriteExec:MmapProtRead=4 -DUSE_ALTERNATIVE_PROT_EXEC_DEFINITION -verify %s |
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| 2 | // RUN: %clang_analyze_cc1 -triple x86_64-unknown-apple-darwin10 -analyzer-checker=alpha.security.MmapWriteExec -verify %s |
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| 3 | |
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| 4 | #define PROT_WRITE 0x02 |
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| 5 | #ifndef USE_ALTERNATIVE_PROT_EXEC_DEFINITION |
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| 6 | #define PROT_EXEC 0x04 |
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| 7 | #define PROT_READ 0x01 |
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| 8 | #else |
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| 9 | #define PROT_EXEC 0x01 |
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| 10 | #define PROT_READ 0x04 |
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| 11 | #endif |
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| 12 | #define MAP_PRIVATE 0x0002 |
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| 13 | #define MAP_ANON 0x1000 |
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| 14 | #define MAP_FIXED 0x0010 |
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| 15 | #define NULL ((void *)0) |
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| 16 | |
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| 17 | typedef __typeof(sizeof(int)) size_t; |
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| 18 | void *mmap(void *, size_t, int, int, int, long); |
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| 19 | int mprotect(void *, size_t, int); |
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| 20 | |
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| 21 | void f1() |
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| 22 | { |
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| 23 | void *a = mmap(NULL, 16, PROT_READ | PROT_EXEC, MAP_PRIVATE | MAP_ANON, -1, 0); // no-warning |
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| 24 | void *b = mmap(a, 16, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0); // no-warning |
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| 25 | void *c = mmap(NULL, 32, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANON, -1, 0); // expected-warning{{Both PROT_WRITE and PROT_EXEC flags are set. This can lead to exploitable memory regions, which could be overwritten with malicious code}} |
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| 26 | (void)a; |
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| 27 | (void)b; |
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| 28 | (void)c; |
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| 29 | } |
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| 30 | |
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| 31 | void f2() |
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| 32 | { |
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| 33 | void *(*callm)(void *, size_t, int, int, int, long); |
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| 34 | callm = mmap; |
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| 35 | int prot = PROT_WRITE | PROT_EXEC; |
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| 36 | (void)callm(NULL, 1024, prot, MAP_PRIVATE | MAP_ANON, -1, 0); // expected-warning{{Both PROT_WRITE and PROT_EXEC flags are set. This can lead to exploitable memory regions, which could be overwritten with malicious code}} |
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| 37 | } |
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| 38 | |
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| 39 | void f3() |
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| 40 | { |
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| 41 | void *p = mmap(NULL, 1024, PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); // no-warning |
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| 42 | int m = mprotect(p, 1024, PROT_WRITE | PROT_EXEC); // expected-warning{{Both PROT_WRITE and PROT_EXEC flags are set. This can lead to exploitable memory regions, which could be overwritten with malicious code}} |
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| 43 | (void)m; |
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| 44 | } |
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| 45 | |
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