signal: replace sigset_to_compat() with put_compat_sigset()

There are 4 callers of sigset_to_compat() in the entire kernel.  One is
in sparc compat rt_sigaction(2), the rest are in kernel/signal.c itself.
All are followed by copy_to_user(), and all but the sparc one are under
"if it's big-endian..." ifdefs.

Let's transform sigset_to_compat() into put_compat_sigset() that also
calls copy_to_user().

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index a5619de3437d..ab1baa79abe8 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -456,7 +456,8 @@ asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 
 extern void sigset_from_compat(sigset_t *set, const compat_sigset_t *compat);
-extern void sigset_to_compat(compat_sigset_t *compat, const sigset_t *set);
+extern int put_compat_sigset(compat_sigset_t __user *compat,
+                             const sigset_t *set, unsigned int size);
 
 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
                 compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,