[patch 28/85] [PATCH 08/44] [CVE-2009-0029] powerpc: Enablesyscall wrappers for 64-bit

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>

commit ee6a093222549ac0c72cfd296c69fa5e7d6daa34 upstream.

This enables the use of syscall wrappers to do proper sign extension
for 64-bit programs.

Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 arch/powerpc/Kconfig     |    1 +
 include/linux/syscalls.h |    6 ++++++
 2 files changed, 7 insertions(+)

--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -122,6 +122,7 @@ config PPC
 	select HAVE_DMA_ATTRS if PPC64
 	select USE_GENERIC_SMP_HELPERS if SMP
 	select HAVE_OPROFILE
+	select HAVE_SYSCALL_WRAPPERS if PPC64
 
 config EARLY_PRINTK
 	bool
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -103,8 +103,14 @@ struct old_linux_dirent;
 #define SYSCALL_DEFINE5(...)    SYSCALL_DEFINEx(5, __VA_ARGS__)
 #define SYSCALL_DEFINE6(...)    SYSCALL_DEFINEx(6, __VA_ARGS__)
 
+#ifdef CONFIG_PPC64
+#define SYSCALL_ALIAS(alias, name)					\
+	asm ("\t.globl " #alias "\n\t.set " #alias ", " #name "\n"	\
+	     "\t.globl ." #alias "\n\t.set ." #alias ", ." #name)
+#else
 #define SYSCALL_ALIAS(alias, name)					\
 	asm ("\t.globl " #alias "\n\t.set " #alias ", " #name)
+#endif
 
 #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
 

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