powerpc: add little endian flag to syscall_get_arch()

Since both ppc and ppc64 have LE variants which are now reported by uname, add
that flag (__AUDIT_ARCH_LE) to syscall_get_arch() and add AUDIT_ARCH_PPC64LE
variant.

Without this,  perf trace and auditctl fail.

Mainline kernel reports ppc64le (per a058801) but there is no matching
AUDIT_ARCH_PPC64LE.

Since 32-bit PPC LE is not supported by audit, don't advertise it in
AUDIT_ARCH_PPC* variants.

See:
	https://www.redhat.com/archives/linux-audit/2014-August/msg00082.html
	https://www.redhat.com/archives/linux-audit/2014-December/msg00004.html

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 7 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h
index 6240698fee9a..ff21b7a2f0cc 100644
--- a/arch/powerpc/include/asm/syscall.h
+++ b/arch/powerpc/include/asm/syscall.h
@@ -90,6 +90,10 @@ static inline void syscall_set_arguments(struct task_struct *task,
 
 static inline int syscall_get_arch(void)
 {
-        return is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
+        int arch = is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
+#ifdef __LITTLE_ENDIAN__
+        arch |= __AUDIT_ARCH_LE;
+#endif
+        return arch;
 }
 #endif  /* _ASM_SYSCALL_H */
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index d4dbef14d4df..584bb0113e25 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -365,7 +365,9 @@ enum {
 #define AUDIT_ARCH_PARISC       (EM_PARISC)
 #define AUDIT_ARCH_PARISC64     (EM_PARISC|__AUDIT_ARCH_64BIT)
 #define AUDIT_ARCH_PPC          (EM_PPC)
+/* do not define AUDIT_ARCH_PPCLE since it is not supported by audit */
 #define AUDIT_ARCH_PPC64        (EM_PPC64|__AUDIT_ARCH_64BIT)
+#define AUDIT_ARCH_PPC64LE      (EM_PPC64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_S390         (EM_S390)
 #define AUDIT_ARCH_S390X        (EM_S390|__AUDIT_ARCH_64BIT)
 #define AUDIT_ARCH_SH           (EM_SH)