[CRIU] [PATCH] compel/x86: Don't use pushq for a label

[Dmitry Safonov]

`pushq` sign-extends the value. Which is a bummer as the label's address
may be higher that 2Gb, which means that the sign-bit will be set.

As it long-jumps with ia32 selector, %r11 can be scratched.
Use %r11 register as a temporary to push the 32-bit address.

Complements: a9a760278c1a ("arch/x86: push correct eip on the stack
before lretq")
Cc: Cyrill Gorcunov <gorcunov at gmail.com>
Reported-by: Andrei Vagin <avagin at gmail.com>
Signed-off-by: Dmitry Safonov <dima at arista.com>
---
 compel/arch/x86/plugins/std/parasite-head.S | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compel/arch/x86/plugins/std/parasite-head.S b/compel/arch/x86/plugins/std/parasite-head.S
index a988de9d4218..465cd887b1f9 100644
--- a/compel/arch/x86/plugins/std/parasite-head.S
+++ b/compel/arch/x86/plugins/std/parasite-head.S
@@ -25,7 +25,9 @@ ENTRY(__export_parasite_head_start_compat)
 .code64
 	PARASITE_ENTRY 0
 	pushq	$__USER32_CS
-	pushq	$2f
+	xor	%r11, %r11
+	movl	$2f, %r11d
+	pushq   %r11
 	lretq
 2:
 .code32
-- 
2.23.0