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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