45 lines
1.9 KiB
C
45 lines
1.9 KiB
C
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// 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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// RUN: %clang_analyze_cc1 -triple x86_64-unknown-apple-darwin10 -analyzer-checker=alpha.security.MmapWriteExec -verify %s
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#define PROT_WRITE 0x02
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#ifndef USE_ALTERNATIVE_PROT_EXEC_DEFINITION
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#define PROT_EXEC 0x04
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#define PROT_READ 0x01
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#else
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#define PROT_EXEC 0x01
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#define PROT_READ 0x04
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#endif
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#define MAP_PRIVATE 0x0002
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#define MAP_ANON 0x1000
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#define MAP_FIXED 0x0010
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#define NULL ((void *)0)
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typedef __typeof(sizeof(int)) size_t;
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void *mmap(void *, size_t, int, int, int, long);
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int mprotect(void *, size_t, int);
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void f1()
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{
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void *a = mmap(NULL, 16, PROT_READ | PROT_EXEC, MAP_PRIVATE | MAP_ANON, -1, 0); // no-warning
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void *b = mmap(a, 16, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED | MAP_ANON, -1, 0); // no-warning
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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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(void)a;
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(void)b;
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(void)c;
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}
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void f2()
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{
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void *(*callm)(void *, size_t, int, int, int, long);
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callm = mmap;
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int prot = PROT_WRITE | PROT_EXEC;
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(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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}
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void f3()
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{
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void *p = mmap(NULL, 1024, PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); // no-warning
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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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(void)m;
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}
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