diff options
Diffstat (limited to 'executor/common.h')
| -rw-r--r-- | executor/common.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/executor/common.h b/executor/common.h index 9531d4a3e..a0ed0026c 100644 --- a/executor/common.h +++ b/executor/common.h @@ -383,7 +383,19 @@ static uint16 csum_inet_digest(struct csum_inet* csum) // syz_execute_func(text ptr[in, text[taget]]) static long syz_execute_func(volatile long text) { - ((void (*)(void))(text))(); + // Here we just to random code which is inherently unsafe. + // But we only care about coverage in the output region. + // The following code tries to remove left-over pointers in registers + // from the reach of the random code, otherwise it's known to reach + // the output region somehow. The asm block is arch-independent except + // for the number of available registers. + volatile long p[8] = {0}; + (void)p; +#if GOARCH_amd64 + asm volatile("" ::"r"(0l), "r"(1l), "r"(2l), "r"(3l), "r"(4l), "r"(5l), "r"(6l), + "r"(7l), "r"(8l), "r"(9l), "r"(10l), "r"(11l), "r"(12l), "r"(13l)); +#endif + NONFAILING(((void (*)(void))(text))()); return 0; } #endif |