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Message-ID: <ee0b34e4-155b-14ef-829e-bf7d9108d417@intel.com>
Date: Tue, 27 Sep 2016 15:36:52 -0700
From: "LeMay, Michael" <michael.lemay@...el.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: [RFC PATCH 4/7] add stack segment override prefix to i386 __clone
When segmentation-hardened SafeStack is enabled, it defines a limit
for DS and ES that is below all of the safe stacks. The i386 __clone
implementation is written in assembly language, so the compiler is
unable to automatically add a stack segment override prefix to an
instruction in that routine that accesses a safe stack. This patch
adds that prefix to the source code.
Signed-off-by: Michael LeMay <michael.lemay@...el.com>
---
src/thread/i386/clone.s | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/thread/i386/clone.s b/src/thread/i386/clone.s
index 52fe7ef..e11372d 100644
--- a/src/thread/i386/clone.s
+++ b/src/thread/i386/clone.s
@@ -22,7 +22,7 @@ __clone:
and $-16,%ecx
sub $16,%ecx
mov 20(%ebp),%edi
- mov %edi,(%ecx)
+ mov %edi,%ss:(%ecx)
mov 24(%ebp),%edx
mov %esp,%esi
mov 32(%ebp),%edi
--
2.7.4
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