Reviewers: ulan,
Description:
Improve ASLR for arm64
[email protected]
Please review this at https://chromiumcodereview.appspot.com/296853005/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+5, -0 lines):
M src/platform-posix.cc
Index: src/platform-posix.cc
diff --git a/src/platform-posix.cc b/src/platform-posix.cc
index
bc315b2e7e15ade647f0a92b121669eb69aaeb8f..5a149bc9119782e75646f4263392eff8290e7c93
100644
--- a/src/platform-posix.cc
+++ b/src/platform-posix.cc
@@ -205,6 +205,11 @@ void* OS::GetRandomMmapAddr() {
// the hint address to 46 bits to give the kernel a fighting chance of
// fulfilling our placement request.
raw_addr &= V8_UINT64_C(0x3ffffffff000);
+#elif V8_HOST_ARCH_ARM64
+ // Currently available CPUs have 40 bits of virtual addressing with 39
for
+ // user space. Truncate the hint address to 38 bits to give the
kernel a
+ // fighting chance of fulfilling our placement request.
+ raw_addr &= V8_UINT64_C(0x3ffffff000);
#else
raw_addr &= 0x3ffff000;
--
--
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