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fs/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types

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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 <[email protected]>
This commit is contained in:
Heiko Carstens 2014-03-04 16:07:52 +01:00
commit 932602e238
4 changed files with 31 additions and 37 deletions
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44
fs/compat.c
View file

@ -399,8 +399,8 @@ static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *u
}
#endif
asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
unsigned long arg)
COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg)
{
mm_segment_t old_fs;
struct flock f;
@ -468,8 +468,8 @@ asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
return ret;
}
asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
unsigned long arg)
COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg)
{
if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
return -EINVAL;
@ -495,32 +495,24 @@ COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_reqs, u32 __user *, ctx32p)
return ret;
}
asmlinkage long
compat_sys_io_getevents(aio_context_t ctx_id,
unsigned long min_nr,
unsigned long nr,
struct io_event __user *events,
struct compat_timespec __user *timeout)
COMPAT_SYSCALL_DEFINE5(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)
{
long ret;
struct timespec t;
struct timespec __user *ut = NULL;
ret = -EFAULT;
if (unlikely(!access_ok(VERIFY_WRITE, events,
nr * sizeof(struct io_event))))
goto out;
if (timeout) {
if (get_compat_timespec(&t, timeout))
goto out;
return -EFAULT;
ut = compat_alloc_user_space(sizeof(*ut));
if (copy_to_user(ut, &t, sizeof(t)) )
goto out;
return -EFAULT;
}
ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
out:
return ret;
return sys_io_getevents(ctx_id, min_nr, nr, events, ut);
}
/* A write operation does a read from user space and vice versa */
@ -616,8 +608,8 @@ copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
asmlinkage long
compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
int, nr, u32 __user *, iocb)
{
struct iocb __user * __user *iocb64;
long ret;
@ -769,10 +761,10 @@ static int do_nfs4_super_data_conv(void *raw_data)
#define NCPFS_NAME "ncpfs"
#define NFS4_NAME "nfs4"
asmlinkage long compat_sys_mount(const char __user * dev_name,
const char __user * dir_name,
const char __user * type, unsigned long flags,
const void __user * data)
COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
const char __user *, dir_name,
const char __user *, type, compat_ulong_t, flags,
const void __user *, data)
{
char *kernel_type;
unsigned long data_page;