52 lines · c
1// RUN: %clang_analyze_cc1 -triple i686-unknown-linux -analyzer-checker=security.MmapWriteExec -DUSE_ALTERNATIVE_PROT_EXEC_DEFINITION -verify %s2// RUN: %clang_analyze_cc1 -triple x86_64-unknown-apple-darwin10 -analyzer-checker=security.MmapWriteExec -verify %s3 4#ifndef USE_ALTERNATIVE_PROT_EXEC_DEFINITION5#define PROT_EXEC 0x016#define PROT_WRITE 0x027#define PROT_READ 0x048#else9#define PROT_EXEC 0x0810#define PROT_WRITE 0x0411#define PROT_READ 0x0212#endif13#define MAP_PRIVATE 0x000214#define MAP_ANON 0x100015#define MAP_FIXED 0x001016#define NULL ((void *)0)17 18typedef __typeof(sizeof(int)) size_t;19void *mmap(void *, size_t, int, int, int, long);20int mprotect(void *, size_t, int);21 22void f1(void)23{24 void *a = mmap(NULL, 16, PROT_READ | PROT_EXEC, MAP_PRIVATE | MAP_ANON, -1, 0); // no-warning25 void *b = mmap(a, 16, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0); // no-warning26 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}}27 (void)a;28 (void)b;29 (void)c;30}31 32void f2(void)33{34 void *(*callm)(void *, size_t, int, int, int, long);35 callm = mmap;36 int prot = PROT_WRITE | PROT_EXEC;37 (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}}38}39 40void f3(void)41{42 void *p = mmap(NULL, 1024, PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); // no-warning43 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}}44 (void)m;45}46 47// gh62285: no crash on non concrete arg 'prot'48void *gh62285(void *addr, int prot)49{50 return mmap(addr, 1, prot, 1, 1, 1);51}52