fs/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types

Some fs compat system calls have unsigned long parameters instead of
compat_ulong_t.
In order to allow the COMPAT_SYSCALL_DEFINE macro generate code that
performs proper zero and sign extension convert all 64 bit parameters
their corresponding 32 bit counterparts.

compat_sys_io_getevents() is a bit different: the non-compat version
has signed parameters for the "min_nr" and "nr" parameters while the
compat version has unsigned parameters.
So change this as well. For all practical purposes this shouldn't make
any difference (doesn't fix a real bug).
Also introduce a generic compat_aio_context_t type which can be used
everywhere.
The access_ok() check within compat_sys_io_getevents() got also removed
since the non-compat sys_io_getevents() should be able to handle
everything anyway.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 1c457428ec0a..fea8ee9afe22 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -71,6 +71,8 @@ typedef struct compat_sigaltstack {
 typedef __compat_uid32_t        compat_uid_t;
 typedef __compat_gid32_t        compat_gid_t;
 
+typedef compat_ulong_t          compat_aio_context_t;
+
 struct compat_sel_arg_struct;
 struct rusage;
 
@@ -497,20 +499,20 @@ asmlinkage long compat_sys_statfs64(const char __user *pathname,
 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
                                      struct compat_statfs64 __user *buf);
 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
-                                   unsigned long arg);
+                                   compat_ulong_t arg);
 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
-                                 unsigned long arg);
+                                 compat_ulong_t arg);
 asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
-asmlinkage long compat_sys_io_getevents(aio_context_t ctx_id,
-                                        unsigned long min_nr,
-                                        unsigned long nr,
+asmlinkage long compat_sys_io_getevents(compat_aio_context_t ctx_id,
+                                        compat_long_t min_nr,
+                                        compat_long_t nr,
                                         struct io_event __user *events,
                                         struct compat_timespec __user *timeout);
-asmlinkage long compat_sys_io_submit(aio_context_t ctx_id, int nr,
+asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
                                      u32 __user *iocb);
 asmlinkage long compat_sys_mount(const char __user *dev_name,
                                  const char __user *dir_name,
-                                 const char __user *type, unsigned long flags,
+                                 const char __user *type, compat_ulong_t flags,
                                  const void __user *data);
 asmlinkage long compat_sys_old_readdir(unsigned int fd,
                                        struct compat_old_linux_dirent __user *,
@@ -633,7 +635,7 @@ asmlinkage long compat_sys_rt_sigqueueinfo(compat_pid_t pid, int sig,
                                 struct compat_siginfo __user *uinfo);
 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
-                                 unsigned long arg);
+                                 compat_ulong_t arg);
 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
                 struct compat_timespec __user *utime, u32 __user *uaddr2,
                 u32 val3);