diff options
Diffstat (limited to 'test/msan/mmap.cc')
-rw-r--r-- | test/msan/mmap.cc | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/msan/mmap.cc b/test/msan/mmap.cc new file mode 100644 index 000000000000..c09fcb76a827 --- /dev/null +++ b/test/msan/mmap.cc @@ -0,0 +1,45 @@ +// Test that mmap (without MAP_FIXED) always returns valid application addresses. +// RUN: %clangxx_msan -O0 %s -o %t && %run %t +// RUN: %clangxx_msan -O0 -fsanitize-memory-track-origins %s -o %t && %run %t + +#include <assert.h> +#include <errno.h> +#include <stdint.h> +#include <sys/mman.h> +#include <stdio.h> + +bool AddrIsApp(void *p) { + uintptr_t addr = (uintptr_t)p; +#if defined(__FreeBSD__) && defined(__x86_64__) + return addr < 0x010000000000ULL || addr >= 0x600000000000ULL; +#elif defined(__x86_64__) + return addr >= 0x600000000000ULL; +#elif defined(__mips64) + return addr >= 0x00e000000000ULL; +#elif defined(__powerpc64__) + return addr < 0x000100000000ULL || addr >= 0x300000000000ULL; +#endif +} + +int main() { + // Large enough to quickly exhaust the entire address space. +#if defined(__mips64) + const size_t kMapSize = 0x100000000ULL; +#else + const size_t kMapSize = 0x1000000000ULL; +#endif + int success_count = 0; + while (true) { + void *p = mmap(0, kMapSize, PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0); + printf("%p\n", p); + if (p == MAP_FAILED) { + assert(errno == ENOMEM); + break; + } + assert(AddrIsApp(p)); + success_count++; + } + printf("successful mappings: %d\n", success_count); + assert(success_count > 5); +} |