[CVE-2009-0029] powerpc: Enable syscall wrappers for 64-bit

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

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 84b861316ce7..e39b73bc0ff8 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -123,6 +123,7 @@ 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
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 0bb537d7ba2e..90aa5eba87a2 100644
--- 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