BACKPORT: seccomp: Add a seccomp_data parameter secure_computing()

Currently, if arch code wants to supply seccomp_data directly to
seccomp (which is generally much faster than having seccomp do it
using the syscall_get_xyz() API), it has to use the two-phase
seccomp hooks. Add it to the easy hooks, too.

Cc: linux-arch@vger.kernel.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
(cherry picked from commit 2f275de5d1ed7269913ef9b4c64a13952c0a38e8)

Bug: 119769499
Change-Id: I96876ecd8d1743c289ecef6d2deb65361d1f5baa
[ghackmann@google.com: drop changes to parisc, tile, and um, which
 didn't implement seccomp support in this kernel version]
Signed-off-by: Greg Hackmann <ghackmann@google.com>

arch/arm/kernel/ptrace.c

@@ -934,7 +934,7 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
 
 	/* Do the secure computing check first; failures should be fast. */
 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
-	if (secure_computing() == -1)
+	if (secure_computing(NULL) == -1)
 		return -1;
 #else
 	/* XXX: remove this once OABI gets fixed */

arch/arm64/kernel/ptrace.c

@@ -1255,7 +1255,7 @@ static void tracehook_report_syscall(struct pt_regs *regs,
 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
 {
 	/* Do the secure computing check first; failures should be fast. */
-	if (secure_computing() == -1)
+	if (secure_computing(NULL) == -1)
 		return -1;
 
 	if (test_thread_flag(TIF_SYSCALL_TRACE))

arch/mips/kernel/ptrace.c

@@ -1023,7 +1023,7 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
 
 	current_thread_info()->syscall = syscall;
 
-	if (secure_computing() == -1)
+	if (secure_computing(NULL) == -1)
 		return -1;
 
 	if (test_thread_flag(TIF_SYSCALL_TRACE) &&

arch/powerpc/kernel/ptrace.c

@@ -1783,7 +1783,7 @@ static int do_seccomp(struct pt_regs *regs)
 	 * have already loaded -ENOSYS into r3, or seccomp has put
 	 * something else in r3 (via SECCOMP_RET_ERRNO/TRACE).
 	 */
-	if (__secure_computing())
+	if (__secure_computing(NULL))
 		return -1;
 
 	/*

arch/s390/kernel/ptrace.c

@@ -826,7 +826,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
 	long ret = 0;
 
 	/* Do the secure computing check first. */
-	if (secure_computing()) {
+	if (secure_computing(NULL)) {
 		/* seccomp failures shouldn't expose any additional code. */
 		ret = -1;
 		goto out;

arch/tile/kernel/ptrace.c

@@ -262,7 +262,7 @@ int do_syscall_trace_enter(struct pt_regs *regs)
 	if (work & _TIF_NOHZ)
 		user_exit();
 
-	if (secure_computing() == -1)
+	if (secure_computing(NULL) == -1)
 		return -1;
 
 	if (work & _TIF_SYSCALL_TRACE) {

arch/x86/entry/vsyscall/vsyscall_64.c

@@ -213,7 +213,7 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
 	 */
 	regs->orig_ax = syscall_nr;
 	regs->ax = -ENOSYS;
-	tmp = secure_computing();
+	tmp = secure_computing(NULL);
 	if ((!tmp && regs->orig_ax != syscall_nr) || regs->ip != address) {
 		warn_bad_vsyscall(KERN_DEBUG, regs,
 				  "seccomp tried to change syscall nr or ip");

include/linux/seccomp.h

@@ -29,11 +29,11 @@ struct seccomp {
 };
 
 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
-extern int __secure_computing(void);
-static inline int secure_computing(void)
+extern int __secure_computing(const struct seccomp_data *sd);
+static inline int secure_computing(const struct seccomp_data *sd)
 {
 	if (unlikely(test_thread_flag(TIF_SECCOMP)))
-		return  __secure_computing();
+		return  __secure_computing(sd);
 	return 0;
 }
 
@@ -62,7 +62,7 @@ struct seccomp { };
 struct seccomp_filter { };
 
 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
-static inline int secure_computing(void) { return 0; }
+static inline int secure_computing(struct seccomp_data *sd) { return 0; }
 #else
 static inline void secure_computing_strict(int this_syscall) { return; }
 #endif

kernel/seccomp.c

@@ -579,9 +579,9 @@ void secure_computing_strict(int this_syscall)
 		BUG();
 }
 #else
-int __secure_computing(void)
+int __secure_computing(const struct seccomp_data *sd)
 {
-	u32 phase1_result = seccomp_phase1(NULL);
+	u32 phase1_result = seccomp_phase1(sd);
 
 	if (likely(phase1_result == SECCOMP_PHASE1_OK))
 		return 0;