asm/syscall.h: add syscall_get_arch
Adds a stub for a function that will return the AUDIT_ARCH_* value
appropriate to the supplied task based on the system call convention.
For audit's use, the value can generally be hard-coded at the
audit-site. However, for other functionality not inlined into syscall
entry/exit, this makes that information available. seccomp_filter is
the first planned consumer and, as such, the comment indicates a tie to
CONFIG_HAVE_ARCH_SECCOMP_FILTER.
Suggested-by: Roland McGrath <mcgrathr@chromium.org>
Signed-off-by: Will Drewry <wad@chromium.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Acked-by: Eric Paris <eparis@redhat.com>
v18: comment and change reword and rebase.
v14: rebase/nochanges
v13: rebase on to 88ebdda6159ffc15699f204c33feb3e431bf9bdc
v12: rebase on to linux-next
v11: fixed improper return type
v10: introduced
Signed-off-by: James Morris <james.l.morris@oracle.com>
diff --git a/include/asm-generic/syscall.h b/include/asm-generic/syscall.h
index 5c122ae..5b09392 100644
--- a/include/asm-generic/syscall.h
+++ b/include/asm-generic/syscall.h
@@ -142,4 +142,18 @@
unsigned int i, unsigned int n,
const unsigned long *args);
+/**
+ * syscall_get_arch - return the AUDIT_ARCH for the current system call
+ * @task: task of interest, must be in system call entry tracing
+ * @regs: task_pt_regs() of @task
+ *
+ * Returns the AUDIT_ARCH_* based on the system call convention in use.
+ *
+ * It's only valid to call this when @task is stopped on entry to a system
+ * call, due to %TIF_SYSCALL_TRACE, %TIF_SYSCALL_AUDIT, or %TIF_SECCOMP.
+ *
+ * Architectures which permit CONFIG_HAVE_ARCH_SECCOMP_FILTER must
+ * provide an implementation of this.
+ */
+int syscall_get_arch(struct task_struct *task, struct pt_regs *regs);
#endif /* _ASM_SYSCALL_H */