[PATCH v9 2/4] seccomp: switch system call argument type to void *

[Tycho Andersen]

The const qualifier causes problems for any code that wants to write to the
third argument of the seccomp syscall, as we will do in a future patch in
this series.

The third argument to the seccomp syscall is documented as void *, so
rather than just dropping the const, let's switch everything to use void *
as well.

I believe this is safe because of 1. the documentation above, 2. there's no
real type information exported about syscalls anywhere besides the man
pages.

Signed-off-by: Tycho Andersen <ty...@tycho.ws>
CC: Kees Cook <keesc...@chromium.org>
CC: Andy Lutomirski <l...@amacapital.net>
CC: Oleg Nesterov <o...@redhat.com>
CC: Eric W. Biederman <ebied...@xmission.com>
CC: "Serge E. Hallyn" <se...@hallyn.com>
CC: Christian Brauner <christ...@brauner.io>
CC: Tyler Hicks <tyhi...@canonical.com>
CC: Akihiro Suda <suda.akih...@lab.ntt.co.jp>
---
 include/linux/seccomp.h | 2 +-
 kernel/seccomp.c        | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index e5320f6c8654..b5103c019cf4 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -43,7 +43,7 @@ extern void secure_computing_strict(int this_syscall);
 #endif
 
 extern long prctl_get_seccomp(void);
-extern long prctl_set_seccomp(unsigned long, char __user *);
+extern long prctl_set_seccomp(unsigned long, void __user *);
 
 static inline int seccomp_mode(struct seccomp *s)
 {
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 96afc32e041d..393e029f778a 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -924,7 +924,7 @@ static long seccomp_get_action_avail(const char __user 
*uaction)
 
 /* Common entry point for both prctl and syscall. */
 static long do_seccomp(unsigned int op, unsigned int flags,
-                      const char __user *uargs)
+                      void __user *uargs)
 {
        switch (op) {
        case SECCOMP_SET_MODE_STRICT:
@@ -944,7 +944,7 @@ static long do_seccomp(unsigned int op, unsigned int flags,
 }
 
 SYSCALL_DEFINE3(seccomp, unsigned int, op, unsigned int, flags,
-                        const char __user *, uargs)
+                        void __user *, uargs)
 {
        return do_seccomp(op, flags, uargs);
 }
@@ -956,10 +956,10 @@ SYSCALL_DEFINE3(seccomp, unsigned int, op, unsigned int, 
flags,
  *
  * Returns 0 on success or -EINVAL on failure.
  */
-long prctl_set_seccomp(unsigned long seccomp_mode, char __user *filter)
+long prctl_set_seccomp(unsigned long seccomp_mode, void __user *filter)
 {
        unsigned int op;
-       char __user *uargs;
+       void __user *uargs;
 
        switch (seccomp_mode) {
        case SECCOMP_MODE_STRICT:
-- 
2.19.1