ruby-changes:68892
From: Maxime <ko1@a...>
Date: Thu, 21 Oct 2021 08:15:05 +0900 (JST)
Subject: [ruby-changes:68892] 3d53ee1761 (master): Fill uninitialized memory with int3
https://git.ruby-lang.org/ruby.git/commit/?id=3d53ee1761 From 3d53ee17616d9c028d2b537989c4cd2e1d08261b Mon Sep 17 00:00:00 2001 From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...> Date: Tue, 6 Apr 2021 11:24:58 -0400 Subject: Fill uninitialized memory with int3 --- yjit_asm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/yjit_asm.c b/yjit_asm.c index fc8472f077..78c9255d65 100644 --- a/yjit_asm.c +++ b/yjit_asm.c @@ -3,6 +3,7 @@ https://github.com/ruby/ruby/blob/trunk/yjit_asm.c#L3 #include <stdio.h> #include <stdlib.h> +#include <string.h> #include <stdarg.h> #include <assert.h> @@ -154,6 +155,10 @@ uint8_t* alloc_exec_mem(uint32_t mem_size) https://github.com/ruby/ruby/blob/trunk/yjit_asm.c#L155 exit(-1); } + // Fill the executable memory with 0x13 so that + // executing uninitialized memory will fault + memset(mem_block, 0xCC, mem_size); + return mem_block; #else return NULL; -- cgit v1.2.1 -- ML: ruby-changes@q... Info: http://www.atdot.net/~ko1/quickml/