[PATCH v2 03/16] sparc/syscall: Fix syscall_get_arch

Andy Lutomirski
2016-01-25T22:24:17Z

Sparc's syscall_get_arch was buggy: it returned the task arch, not the
syscall arch. This could confuse seccomp and audit.

I don't think this is as bad for seccomp as it looks: sparc's
32-bit and 64-bit syscalls are numbered the same.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/sparc/include/asm/syscall.h | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/sparc/include/asm/syscall.h b/arch/sparc/include/asm/syscall.h
index 49f71fd5b56e..1757cd6c521b 100644
--- a/arch/sparc/include/asm/syscall.h
+++ b/arch/sparc/include/asm/syscall.h
@@ -3,6 +3,7 @@

#include <uapi/linux/audit.h>
#include <linux/kernel.h>
+#include <linux/compat.h>
#include <linux/sched.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
@@ -128,7 +129,13 @@ static inline void syscall_set_arguments(struct task_struct *task,

static inline int syscall_get_arch(void)
{
- return is_32bit_task() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
+#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
+ return in_compat_syscall() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
+#elif defined(CONFIG_SPARC64)
+ return AUDIT_ARCH_SPARC64;
+#else
+ return AUDIT_ARCH_SPARC;
+#endif
}

#endif /* __ASM_SPARC_SYSCALL_H */
--
2.5.0