seccomp: Allow arch code to provide seccomp_data
populate_seccomp_data is expensive: it works by inspecting
task_pt_regs and various other bits to piece together all the
information, and it's does so in multiple partially redundant steps.
Arch-specific code in the syscall entry path can do much better.
Admittedly this adds a bit of additional room for error, but the
speedup should be worth it.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Kees Cook <keescook@chromium.org>
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index 3885108..a19ddac 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -39,7 +39,7 @@
#define SECCOMP_PHASE1_OK 0
#define SECCOMP_PHASE1_SKIP 1
-extern u32 seccomp_phase1(void);
+extern u32 seccomp_phase1(struct seccomp_data *sd);
int seccomp_phase2(u32 phase1_result);
#else
extern void secure_computing_strict(int this_syscall);