diff options
| -rw-r--r-- | include/qemu/osdep.h | 2 | ||||
| -rw-r--r-- | util/osdep.c | 41 |
2 files changed, 43 insertions, 0 deletions
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h index 826650c58a..281782d526 100644 --- a/include/qemu/osdep.h +++ b/include/qemu/osdep.h @@ -371,6 +371,8 @@ void sigaction_invoke(struct sigaction *action, #endif int qemu_madvise(void *addr, size_t len, int advice); +int qemu_mprotect_rwx(void *addr, size_t size); +int qemu_mprotect_none(void *addr, size_t size); int qemu_open(const char *name, int flags, ...); int qemu_close(int fd); diff --git a/util/osdep.c b/util/osdep.c index a479fedc4a..1231f9f876 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -73,6 +73,47 @@ int qemu_madvise(void *addr, size_t len, int advice) #endif } +static int qemu_mprotect__osdep(void *addr, size_t size, int prot) +{ + g_assert(!((uintptr_t)addr & ~qemu_real_host_page_mask)); + g_assert(!(size & ~qemu_real_host_page_mask)); + +#ifdef _WIN32 + DWORD old_protect; + + if (!VirtualProtect(addr, size, prot, &old_protect)) { + error_report("%s: VirtualProtect failed with error code %ld", + __func__, GetLastError()); + return -1; + } + return 0; +#else + if (mprotect(addr, size, prot)) { + error_report("%s: mprotect failed: %s", __func__, strerror(errno)); + return -1; + } + return 0; +#endif +} + +int qemu_mprotect_rwx(void *addr, size_t size) +{ +#ifdef _WIN32 + return qemu_mprotect__osdep(addr, size, PAGE_EXECUTE_READWRITE); +#else + return qemu_mprotect__osdep(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC); +#endif +} + +int qemu_mprotect_none(void *addr, size_t size) +{ +#ifdef _WIN32 + return qemu_mprotect__osdep(addr, size, PAGE_NOACCESS); +#else + return qemu_mprotect__osdep(addr, size, PROT_NONE); +#endif +} + #ifndef _WIN32 static int fcntl_op_setlk = -1; |