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From: Alexey Dobriyan <adobriyan@gmail.com>
To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] x86, putuser: add ASM_CALL_CONSTRAINT
Date: Sun, 17 Mar 2019 00:01:27 +0300	[thread overview]
Message-ID: <20190316210127.GA21830@avx2> (raw)

Clobber stack pointer given that assembly does CALL.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 arch/x86/include/asm/uaccess.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -176,7 +176,8 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
 })
 
 #define __put_user_x(size, x, ptr, __ret_pu)			\
-	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
+	asm volatile("call __put_user_" #size			\
+		     : "=a" (__ret_pu), ASM_CALL_CONSTRAINT	\
 		     : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
 
 

             reply	other threads:[~2019-03-16 21:01 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-16 21:01 Alexey Dobriyan [this message]
2019-03-24 21:32 ` Borislav Petkov

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