diff options
Diffstat (limited to 'wasm2c/wasm-rt.h')
| -rw-r--r-- | wasm2c/wasm-rt.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/wasm2c/wasm-rt.h b/wasm2c/wasm-rt.h index 55b3cce8..bd0cd61d 100644 --- a/wasm2c/wasm-rt.h +++ b/wasm2c/wasm-rt.h @@ -166,11 +166,20 @@ extern "C" { #define WASM_RT_INSTALL_SIGNAL_HANDLER 0 #endif +/* This macro, if defined, allows the embedder to disable all stack exhaustion + * checks. This a non conformant configuration, i.e., this does not respect + * Wasm's specification, and may compromise security. Use with caution. + */ +#ifndef WASM_RT_NONCONFORMING_UNCHECKED_STACK_EXHAUSTION +#define WASM_RT_NONCONFORMING_UNCHECKED_STACK_EXHAUSTION 0 +#endif + /* We need to detect and trap stack overflows. If we use a signal handler on * POSIX systems, this can detect call stack overflows. On windows, or platforms * without a signal handler, we use stack depth counting. */ -#if !defined(WASM_RT_STACK_DEPTH_COUNT) && \ - !defined(WASM_RT_STACK_EXHAUSTION_HANDLER) +#if !defined(WASM_RT_STACK_DEPTH_COUNT) && \ + !defined(WASM_RT_STACK_EXHAUSTION_HANDLER) && \ + !WASM_RT_NONCONFORMING_UNCHECKED_STACK_EXHAUSTION #if WASM_RT_INSTALL_SIGNAL_HANDLER && !defined(_WIN32) #define WASM_RT_STACK_EXHAUSTION_HANDLER 1 @@ -188,6 +197,15 @@ extern "C" { #define WASM_RT_STACK_EXHAUSTION_HANDLER 0 #endif +#if WASM_RT_NONCONFORMING_UNCHECKED_STACK_EXHAUSTION + +#if (WASM_RT_STACK_EXHAUSTION_HANDLER + WASM_RT_STACK_DEPTH_COUNT) != 0 +#error \ + "Cannot specify WASM_RT_NONCONFORMING_UNCHECKED_STACK_EXHAUSTION along with WASM_RT_STACK_EXHAUSTION_HANDLER or WASM_RT_STACK_DEPTH_COUNT" +#endif + +#else + #if (WASM_RT_STACK_EXHAUSTION_HANDLER + WASM_RT_STACK_DEPTH_COUNT) > 1 #error \ "Cannot specify multiple options from WASM_RT_STACK_EXHAUSTION_HANDLER , WASM_RT_STACK_DEPTH_COUNT" @@ -196,6 +214,8 @@ extern "C" { "Must specify one of WASM_RT_STACK_EXHAUSTION_HANDLER , WASM_RT_STACK_DEPTH_COUNT" #endif +#endif + #if WASM_RT_STACK_EXHAUSTION_HANDLER && !WASM_RT_INSTALL_SIGNAL_HANDLER #error \ "WASM_RT_STACK_EXHAUSTION_HANDLER can only be used if WASM_RT_INSTALL_SIGNAL_HANDLER is enabled" |