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y2038: socket: Change recvmmsg to use __kernel_timespec 

This converts the recvmmsg() system call in all its variations to use
'timespec64' internally for its timeout, and have a __kernel_timespec64
argument in the native entry point. This lets us change the type to use
64-bit time_t at a later point while using the 32-bit compat system call
emulation for existing user space.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2018-04-18 13:42:25 +02:00
parent 474b9c777b
commit c2e6c8567a
4 changed files with 14 additions and 16 deletions
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4
include/linux/socket.h
View File

@ -348,7 +348,7 @@ struct ucred {
extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
struct timespec;
struct timespec64;
/* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
* forbid_cmsg_compat==false
@ -358,7 +358,7 @@ extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
unsigned int flags, bool forbid_cmsg_compat);
extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
unsigned int flags, struct timespec *timeout);
unsigned int flags, struct timespec64 *timeout);
extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
unsigned int vlen, unsigned int flags,
bool forbid_cmsg_compat);

2
include/linux/syscalls.h
View File

@ -830,7 +830,7 @@ asmlinkage long sys_perf_event_open(
asmlinkage long sys_accept4(int, struct sockaddr __user *, int __user *, int);
asmlinkage long sys_recvmmsg(int fd, struct mmsghdr __user *msg,
unsigned int vlen, unsigned flags,
struct timespec __user *timeout);
struct __kernel_timespec __user *timeout);
asmlinkage long sys_wait4(pid_t pid, int __user *stat_addr,
int options, struct rusage __user *ru);

6
net/compat.c
View File

@ -815,18 +815,18 @@ static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
struct old_timespec32 __user *timeout)
{
int datagrams;
struct timespec ktspec;
struct timespec64 ktspec;
if (timeout == NULL)
return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
flags | MSG_CMSG_COMPAT, NULL);
if (compat_get_timespec(&ktspec, timeout))
if (compat_get_timespec64(&ktspec, timeout))
return -EFAULT;
datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
flags | MSG_CMSG_COMPAT, &ktspec);
if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
if (datagrams > 0 && compat_put_timespec64(&ktspec, timeout))
datagrams = -EFAULT;
return datagrams;

18
net/socket.c
View File

@ -2340,7 +2340,7 @@ SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
*/
int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
unsigned int flags, struct timespec *timeout)
unsigned int flags, struct timespec64 *timeout)
{
int fput_needed, err, datagrams;
struct socket *sock;
@ -2405,8 +2405,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
if (timeout) {
ktime_get_ts64(&timeout64);
*timeout = timespec64_to_timespec(
timespec64_sub(end_time, timeout64));
*timeout = timespec64_sub(end_time, timeout64);
if (timeout->tv_sec < 0) {
timeout->tv_sec = timeout->tv_nsec = 0;
break;
@ -2452,10 +2451,10 @@ out_put:
static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
unsigned int vlen, unsigned int flags,
struct timespec __user *timeout)
struct __kernel_timespec __user *timeout)
{
int datagrams;
struct timespec timeout_sys;
struct timespec64 timeout_sys;
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
@ -2463,13 +2462,12 @@ static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
if (!timeout)
return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
if (get_timespec64(&timeout_sys, timeout))
return -EFAULT;
datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
if (datagrams > 0 &&
copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
if (datagrams > 0 && put_timespec64(&timeout_sys, timeout))
datagrams = -EFAULT;
return datagrams;
@ -2477,7 +2475,7 @@ static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
unsigned int, vlen, unsigned int, flags,
struct timespec __user *, timeout)
struct __kernel_timespec __user *, timeout)
{
return do_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
}
@ -2601,7 +2599,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
break;
case SYS_RECVMMSG:
err = do_sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2],
a[3], (struct timespec __user *)a[4]);
a[3], (struct __kernel_timespec __user *)a[4]);
break;
case SYS_ACCEPT4:
err = __sys_accept4(a0, (struct sockaddr __user *)a1,