From: Deepa Dinamani <deepa.kernel@gmail.com>
To: tglx@linutronix.de, john.stultz@linaro.org
Cc: linux-kernel@vger.kernel.org, arnd@arndb.de, y2038@lists.linaro.org
Subject: [PATCH v2 03/10] compat: enable compat_get/put_timespec64 always
Date: Mon, 27 Nov 2017 11:30:30 -0800 [thread overview]
Message-ID: <20171127193037.8711-4-deepa.kernel@gmail.com> (raw)
In-Reply-To: <20171127193037.8711-1-deepa.kernel@gmail.com>
These functions are used in the repurposed compat syscalls
to provide backward compatibility for using 32 bit time_t
on 32 bit systems.
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
---
include/linux/compat.h | 2 -
include/linux/compat_time.h | 4 ++
kernel/Makefile | 2 +-
kernel/compat.c | 92 +++++++++++++++++++++++----------------------
4 files changed, 53 insertions(+), 47 deletions(-)
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 2f79dac5ed65..e06f11886000 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -168,8 +168,6 @@ extern int compat_get_timespec(struct timespec *, const void __user *);
extern int compat_put_timespec(const struct timespec *, void __user *);
extern int compat_get_timeval(struct timeval *, const void __user *);
extern int compat_put_timeval(const struct timeval *, void __user *);
-extern int compat_get_timespec64(struct timespec64 *, const void __user *);
-extern int compat_put_timespec64(const struct timespec64 *, void __user *);
extern int get_compat_itimerspec64(struct itimerspec64 *its,
const struct compat_itimerspec __user *uits);
extern int put_compat_itimerspec64(const struct itimerspec64 *its,
diff --git a/include/linux/compat_time.h b/include/linux/compat_time.h
index 56a54a1e4355..31f2774f1994 100644
--- a/include/linux/compat_time.h
+++ b/include/linux/compat_time.h
@@ -3,6 +3,7 @@
#define _LINUX_COMPAT_TIME_H
#include <linux/types.h>
+#include <linux/time64.h>
typedef s32 compat_time_t;
@@ -16,4 +17,7 @@ struct compat_timeval {
s32 tv_usec;
};
+extern int compat_get_timespec64(struct timespec64 *, const void __user *);
+extern int compat_put_timespec64(const struct timespec64 *, void __user *);
+
#endif /* _LINUX_COMPAT_TIME_H */
diff --git a/kernel/Makefile b/kernel/Makefile
index 172d151d429c..2e3df3deee18 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -66,7 +66,7 @@ obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
-obj-$(CONFIG_COMPAT) += compat.o
+obj-y += compat.o
obj-$(CONFIG_CGROUPS) += cgroup/
obj-$(CONFIG_UTS_NS) += utsname.o
obj-$(CONFIG_USER_NS) += user_namespace.o
diff --git a/kernel/compat.c b/kernel/compat.c
index d1cee656a7ed..42653ac977c0 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -30,6 +30,52 @@
#include <linux/uaccess.h>
+static int __compat_get_timespec64(struct timespec64 *ts64,
+ const struct compat_timespec __user *cts)
+{
+ struct compat_timespec ts;
+ int ret;
+
+ ret = copy_from_user(&ts, cts, sizeof(ts));
+ if (ret)
+ return -EFAULT;
+
+ ts64->tv_sec = ts.tv_sec;
+ ts64->tv_nsec = ts.tv_nsec;
+
+ return 0;
+}
+
+static int __compat_put_timespec64(const struct timespec64 *ts64,
+ struct compat_timespec __user *cts)
+{
+ struct compat_timespec ts = {
+ .tv_sec = ts64->tv_sec,
+ .tv_nsec = ts64->tv_nsec
+ };
+ return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
+}
+
+int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
+{
+ if (COMPAT_USE_64BIT_TIME)
+ return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
+ else
+ return __compat_get_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_get_timespec64);
+
+int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
+{
+ if (COMPAT_USE_64BIT_TIME)
+ return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
+ else
+ return __compat_put_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_put_timespec64);
+
+#ifdef CONFIG_COMPAT
+
int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
{
struct compat_timex tx32;
@@ -120,50 +166,6 @@ static int __compat_put_timespec(const struct timespec *ts, struct compat_timesp
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
-static int __compat_get_timespec64(struct timespec64 *ts64,
- const struct compat_timespec __user *cts)
-{
- struct compat_timespec ts;
- int ret;
-
- ret = copy_from_user(&ts, cts, sizeof(ts));
- if (ret)
- return -EFAULT;
-
- ts64->tv_sec = ts.tv_sec;
- ts64->tv_nsec = ts.tv_nsec;
-
- return 0;
-}
-
-static int __compat_put_timespec64(const struct timespec64 *ts64,
- struct compat_timespec __user *cts)
-{
- struct compat_timespec ts = {
- .tv_sec = ts64->tv_sec,
- .tv_nsec = ts64->tv_nsec
- };
- return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
-}
-
-int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
-{
- if (COMPAT_USE_64BIT_TIME)
- return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
- else
- return __compat_get_timespec64(ts, uts);
-}
-EXPORT_SYMBOL_GPL(compat_get_timespec64);
-
-int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
-{
- if (COMPAT_USE_64BIT_TIME)
- return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
- else
- return __compat_put_timespec64(ts, uts);
-}
-EXPORT_SYMBOL_GPL(compat_put_timespec64);
-
int compat_get_timeval(struct timeval *tv, const void __user *utv)
{
if (COMPAT_USE_64BIT_TIME)
@@ -582,3 +584,5 @@ void __user *compat_alloc_user_space(unsigned long len)
return ptr;
}
EXPORT_SYMBOL_GPL(compat_alloc_user_space);
+
+#endif
--
2.14.1
next prev parent reply other threads:[~2017-11-27 19:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 19:30 [PATCH v2 00/10] posix_clocks: Prepare syscalls for 64 bit time_t conversion Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 01/10] compat: Make compat helpers independent of CONFIG_COMPAT Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 02/10] include: Move compat_timespec/ timeval to compat_time.h Deepa Dinamani
2017-11-27 19:30 ` Deepa Dinamani [this message]
2017-12-14 23:27 ` [Y2038] [PATCH v2 03/10] compat: enable compat_get/put_timespec64 always Ben Hutchings
2018-01-07 16:28 ` Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 04/10] arch: introduce CONFIG_64BIT_TIME Deepa Dinamani
2017-12-14 23:22 ` [Y2038] " Ben Hutchings
2017-11-27 19:30 ` [PATCH v2 05/10] arch: Introduce CONFIG_COMPAT_32BIT_TIME Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 06/10] posix-clocks: Make compat syscalls depend on CONFIG_COMPAT_32BIT_TIME Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 07/10] include: Add new y2038 safe __kernel_timespec Deepa Dinamani
2017-12-15 0:11 ` [Y2038] " Ben Hutchings
2017-12-15 10:36 ` Arnd Bergmann
2017-11-27 19:30 ` [PATCH v2 08/10] fix get_timespec64() for y2038 safe compat interfaces Deepa Dinamani
2017-12-15 0:21 ` [Y2038] " Ben Hutchings
2017-12-15 12:02 ` Arnd Bergmann
2017-12-17 23:51 ` Ben Hutchings
2017-12-18 5:11 ` Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 09/10] change time types to new y2038 safe __kernel_* types Deepa Dinamani
2017-11-27 19:30 ` [PATCH v2 10/10] nanosleep: change time types to " Deepa Dinamani
2017-12-15 0:31 ` [Y2038] " Ben Hutchings
2017-11-27 21:58 ` [PATCH v2 00/10] posix_clocks: Prepare syscalls for 64 bit time_t conversion Arnd Bergmann
2017-11-27 22:29 ` Deepa Dinamani
2017-11-28 14:17 ` Arnd Bergmann
2017-11-28 23:17 ` Deepa Dinamani
2017-11-29 21:12 ` Arnd Bergmann
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