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Date: Mon, 27 Aug 2018 21:45:30 +0200
From: Arnd Bergmann <arnd@...db.de>
To: tglx@...utronix.de
Cc: y2038@...ts.linaro.org, linux-api@...r.kernel.org,
Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
torvalds@...ux-foundation.org, deepa.kernel@...il.com,
linux-arch@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 13/14] 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@...db.de>
---
include/linux/socket.h | 4 ++--
include/linux/syscalls.h | 2 +-
net/compat.c | 6 +++---
net/socket.c | 18 ++++++++----------
4 files changed, 14 insertions(+), 16 deletions(-)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 7ed4713d5337..8b571e9b9f76 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -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);
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 5642016a312d..fb3a05fab8aa 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -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);
diff --git a/net/compat.c b/net/compat.c
index 2ef160876bc1..47a614b370cd 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -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;
diff --git a/net/socket.c b/net/socket.c
index e6945e318f02..b9d71b503720 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -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 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
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,
--
2.18.0
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