* [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32
@ 2020-11-03 3:05 chensong
2020-11-10 10:17 ` Jan Kiszka
0 siblings, 1 reply; 5+ messages in thread
From: chensong @ 2020-11-03 3:05 UTC (permalink / raw)
To: xenomai, jan.kiszka, henning.schild
1, introduce old_timespec32 for 32bit process with 32bit timespec
2, implement clock_settime64 for 32bit process with 64bit timespec
Signed-off-by: chensong <chensong@tj.kylinos.cn>
---
include/cobalt/kernel/compat.h | 6 ++++++
kernel/cobalt/posix/compat.c | 20 ++++++++++++++++++++
kernel/cobalt/posix/syscall32.c | 20 +++++++++++++++++---
kernel/cobalt/posix/syscall32.h | 6 +++++-
4 files changed, 48 insertions(+), 4 deletions(-)
diff --git a/include/cobalt/kernel/compat.h b/include/cobalt/kernel/compat.h
index 05754cb..adf8bae 100644
--- a/include/cobalt/kernel/compat.h
+++ b/include/cobalt/kernel/compat.h
@@ -89,6 +89,12 @@ struct compat_rtdm_mmap_request {
int sys32_get_timespec(struct timespec *ts,
const struct compat_timespec __user *cts);
+int sys32_get_timespec_old(struct timespec64 *ts,
+ const struct old_timespec32 __user *cts);
+
+int sys32_get_timespec64(struct timespec64 *ts,
+ const struct __kernel_timespec __user *cts);
+
int sys32_put_timespec(struct compat_timespec __user *cts,
const struct timespec *ts);
diff --git a/kernel/cobalt/posix/compat.c b/kernel/cobalt/posix/compat.c
index 17968bf..3042dc0 100644
--- a/kernel/cobalt/posix/compat.c
+++ b/kernel/cobalt/posix/compat.c
@@ -32,6 +32,26 @@ int sys32_get_timespec(struct timespec *ts,
}
EXPORT_SYMBOL_GPL(sys32_get_timespec);
+int sys32_get_timespec_old(struct timespec64 *ts,
+ const struct old_timespec32 __user *cts)
+{
+ return (cts == NULL ||
+ !access_rok(cts, sizeof(*cts)) ||
+ __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
+ __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
+}
+EXPORT_SYMBOL_GPL(sys32_get_timespec_old);
+
+int sys32_get_timespec64(struct timespec64 *ts,
+ const struct __kernel_timespec __user *cts)
+{
+ return (cts == NULL ||
+ !access_rok(cts, sizeof(*cts)) ||
+ __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
+ __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
+}
+EXPORT_SYMBOL_GPL(sys32_get_timespec64);
+
int sys32_put_timespec(struct compat_timespec __user *cts,
const struct timespec *ts)
{
diff --git a/kernel/cobalt/posix/syscall32.c b/kernel/cobalt/posix/syscall32.c
index faa7ef5..47a8ad3 100644
--- a/kernel/cobalt/posix/syscall32.c
+++ b/kernel/cobalt/posix/syscall32.c
@@ -159,12 +159,26 @@ COBALT_SYSCALL32emu(clock_gettime, current,
COBALT_SYSCALL32emu(clock_settime, current,
(clockid_t clock_id,
- const struct compat_timespec __user *u_ts))
+ const struct old_timespec32 __user *u_ts))
{
- struct timespec ts;
+ struct timespec64 ts;
+ int ret;
+
+ ret = sys32_get_timespec_old(&ts, u_ts);
+ if (ret)
+ return ret;
+
+ return __cobalt_clock_settime(clock_id, &ts);
+}
+
+COBALT_SYSCALL32emu(clock_settime64, current,
+ (clockid_t clock_id,
+ const struct __kernel_timespec __user *u_ts))
+{
+ struct timespec64 ts;
int ret;
- ret = sys32_get_timespec(&ts, u_ts);
+ ret = sys32_get_timespec64(&ts, u_ts);
if (ret)
return ret;
diff --git a/kernel/cobalt/posix/syscall32.h b/kernel/cobalt/posix/syscall32.h
index 34904f9..32b87c4 100644
--- a/kernel/cobalt/posix/syscall32.h
+++ b/kernel/cobalt/posix/syscall32.h
@@ -57,7 +57,11 @@ COBALT_SYSCALL32emu_DECL(clock_getres,
COBALT_SYSCALL32emu_DECL(clock_gettime,
(clockid_t clock_id,
- struct compat_timespec __user *u_ts));
+ struct old_timespec32 __user *u_ts));
+
+COBALT_SYSCALL32emu_DECL(clock_settime64,
+ (clockid_t clock_id,
+ const struct __kernel_timespec __user *u_ts));
COBALT_SYSCALL32emu_DECL(clock_settime,
(clockid_t clock_id,
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32
2020-11-03 3:05 [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32 chensong
@ 2020-11-10 10:17 ` Jan Kiszka
2020-11-11 5:50 ` chensong
0 siblings, 1 reply; 5+ messages in thread
From: Jan Kiszka @ 2020-11-10 10:17 UTC (permalink / raw)
To: chensong, xenomai, henning.schild
On 03.11.20 04:05, chensong wrote:
> 1, introduce old_timespec32 for 32bit process with 32bit timespec
> 2, implement clock_settime64 for 32bit process with 64bit timespec
>
> Signed-off-by: chensong <chensong@tj.kylinos.cn>
> ---
> include/cobalt/kernel/compat.h | 6 ++++++
> kernel/cobalt/posix/compat.c | 20 ++++++++++++++++++++
> kernel/cobalt/posix/syscall32.c | 20 +++++++++++++++++---
> kernel/cobalt/posix/syscall32.h | 6 +++++-
> 4 files changed, 48 insertions(+), 4 deletions(-)
>
> diff --git a/include/cobalt/kernel/compat.h b/include/cobalt/kernel/compat.h
> index 05754cb..adf8bae 100644
> --- a/include/cobalt/kernel/compat.h
> +++ b/include/cobalt/kernel/compat.h
> @@ -89,6 +89,12 @@ struct compat_rtdm_mmap_request {
> int sys32_get_timespec(struct timespec *ts,
> const struct compat_timespec __user *cts);
>
> +int sys32_get_timespec_old(struct timespec64 *ts,
> + const struct old_timespec32 __user *cts);
> +
> +int sys32_get_timespec64(struct timespec64 *ts,
> + const struct __kernel_timespec __user *cts);
> +
> int sys32_put_timespec(struct compat_timespec __user *cts,
> const struct timespec *ts);
>
> diff --git a/kernel/cobalt/posix/compat.c b/kernel/cobalt/posix/compat.c
> index 17968bf..3042dc0 100644
> --- a/kernel/cobalt/posix/compat.c
> +++ b/kernel/cobalt/posix/compat.c
> @@ -32,6 +32,26 @@ int sys32_get_timespec(struct timespec *ts,
> }
> EXPORT_SYMBOL_GPL(sys32_get_timespec);
>
> +int sys32_get_timespec_old(struct timespec64 *ts,
> + const struct old_timespec32 __user *cts)
> +{
> + return (cts == NULL ||
> + !access_rok(cts, sizeof(*cts)) ||
> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
> +}
> +EXPORT_SYMBOL_GPL(sys32_get_timespec_old);
> +
> +int sys32_get_timespec64(struct timespec64 *ts,
> + const struct __kernel_timespec __user *cts)
> +{
> + return (cts == NULL ||
> + !access_rok(cts, sizeof(*cts)) ||
> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
> +}
> +EXPORT_SYMBOL_GPL(sys32_get_timespec64);
> +
> int sys32_put_timespec(struct compat_timespec __user *cts,
> const struct timespec *ts)
> {
> diff --git a/kernel/cobalt/posix/syscall32.c b/kernel/cobalt/posix/syscall32.c
> index faa7ef5..47a8ad3 100644
> --- a/kernel/cobalt/posix/syscall32.c
> +++ b/kernel/cobalt/posix/syscall32.c
> @@ -159,12 +159,26 @@ COBALT_SYSCALL32emu(clock_gettime, current,
>
> COBALT_SYSCALL32emu(clock_settime, current,
> (clockid_t clock_id,
> - const struct compat_timespec __user *u_ts))
> + const struct old_timespec32 __user *u_ts))
> {
> - struct timespec ts;
> + struct timespec64 ts;
> + int ret;
> +
> + ret = sys32_get_timespec_old(&ts, u_ts);
> + if (ret)
> + return ret;
> +
> + return __cobalt_clock_settime(clock_id, &ts);
> +}
> +
> +COBALT_SYSCALL32emu(clock_settime64, current,
> + (clockid_t clock_id,
> + const struct __kernel_timespec __user *u_ts))
Hmm, do we need that as compat syscall? I would expect that the new
settime64 ABI would work for both 32-bit and 64-bit applications, no?
> +{
> + struct timespec64 ts;
> int ret;
>
> - ret = sys32_get_timespec(&ts, u_ts);
> + ret = sys32_get_timespec64(&ts, u_ts);
> if (ret)
> return ret;
>
> diff --git a/kernel/cobalt/posix/syscall32.h b/kernel/cobalt/posix/syscall32.h
> index 34904f9..32b87c4 100644
> --- a/kernel/cobalt/posix/syscall32.h
> +++ b/kernel/cobalt/posix/syscall32.h
> @@ -57,7 +57,11 @@ COBALT_SYSCALL32emu_DECL(clock_getres,
>
> COBALT_SYSCALL32emu_DECL(clock_gettime,
> (clockid_t clock_id,
> - struct compat_timespec __user *u_ts));
> + struct old_timespec32 __user *u_ts));
> +
> +COBALT_SYSCALL32emu_DECL(clock_settime64,
> + (clockid_t clock_id,
> + const struct __kernel_timespec __user *u_ts));
>
> COBALT_SYSCALL32emu_DECL(clock_settime,
> (clockid_t clock_id,
>
Jan
--
Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32
2020-11-10 10:17 ` Jan Kiszka
@ 2020-11-11 5:50 ` chensong
2020-11-11 7:34 ` Jan Kiszka
0 siblings, 1 reply; 5+ messages in thread
From: chensong @ 2020-11-11 5:50 UTC (permalink / raw)
To: Jan Kiszka, xenomai, henning.schild
On 2020年11月10日 18:17, Jan Kiszka wrote:
>
> On 03.11.20 04:05, chensong wrote:
>> 1, introduce old_timespec32 for 32bit process with 32bit timespec
>> 2, implement clock_settime64 for 32bit process with 64bit timespec
>>
>> Signed-off-by: chensong <chensong@tj.kylinos.cn>
>> ---
>> include/cobalt/kernel/compat.h | 6 ++++++
>> kernel/cobalt/posix/compat.c | 20 ++++++++++++++++++++
>> kernel/cobalt/posix/syscall32.c | 20 +++++++++++++++++---
>> kernel/cobalt/posix/syscall32.h | 6 +++++-
>> 4 files changed, 48 insertions(+), 4 deletions(-)
>>
>> diff --git a/include/cobalt/kernel/compat.h b/include/cobalt/kernel/compat.h
>> index 05754cb..adf8bae 100644
>> --- a/include/cobalt/kernel/compat.h
>> +++ b/include/cobalt/kernel/compat.h
>> @@ -89,6 +89,12 @@ struct compat_rtdm_mmap_request {
>> int sys32_get_timespec(struct timespec *ts,
>> const struct compat_timespec __user *cts);
>>
>> +int sys32_get_timespec_old(struct timespec64 *ts,
>> + const struct old_timespec32 __user *cts);
>> +
>> +int sys32_get_timespec64(struct timespec64 *ts,
>> + const struct __kernel_timespec __user *cts);
>> +
>> int sys32_put_timespec(struct compat_timespec __user *cts,
>> const struct timespec *ts);
>>
>> diff --git a/kernel/cobalt/posix/compat.c b/kernel/cobalt/posix/compat.c
>> index 17968bf..3042dc0 100644
>> --- a/kernel/cobalt/posix/compat.c
>> +++ b/kernel/cobalt/posix/compat.c
>> @@ -32,6 +32,26 @@ int sys32_get_timespec(struct timespec *ts,
>> }
>> EXPORT_SYMBOL_GPL(sys32_get_timespec);
>>
>> +int sys32_get_timespec_old(struct timespec64 *ts,
>> + const struct old_timespec32 __user *cts)
>> +{
>> + return (cts == NULL ||
>> + !access_rok(cts, sizeof(*cts)) ||
>> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
>> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
>> +}
>> +EXPORT_SYMBOL_GPL(sys32_get_timespec_old);
>> +
>> +int sys32_get_timespec64(struct timespec64 *ts,
>> + const struct __kernel_timespec __user *cts)
>> +{
>> + return (cts == NULL ||
>> + !access_rok(cts, sizeof(*cts)) ||
>> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
>> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
>> +}
>> +EXPORT_SYMBOL_GPL(sys32_get_timespec64);
>> +
>> int sys32_put_timespec(struct compat_timespec __user *cts,
>> const struct timespec *ts)
>> {
>> diff --git a/kernel/cobalt/posix/syscall32.c b/kernel/cobalt/posix/syscall32.c
>> index faa7ef5..47a8ad3 100644
>> --- a/kernel/cobalt/posix/syscall32.c
>> +++ b/kernel/cobalt/posix/syscall32.c
>> @@ -159,12 +159,26 @@ COBALT_SYSCALL32emu(clock_gettime, current,
>>
>> COBALT_SYSCALL32emu(clock_settime, current,
>> (clockid_t clock_id,
>> - const struct compat_timespec __user *u_ts))
>> + const struct old_timespec32 __user *u_ts))
>> {
>> - struct timespec ts;
>> + struct timespec64 ts;
>> + int ret;
>> +
>> + ret = sys32_get_timespec_old(&ts, u_ts);
>> + if (ret)
>> + return ret;
>> +
>> + return __cobalt_clock_settime(clock_id, &ts);
>> +}
>> +
>> +COBALT_SYSCALL32emu(clock_settime64, current,
>> + (clockid_t clock_id,
>> + const struct __kernel_timespec __user *u_ts))
>
> Hmm, do we need that as compat syscall? I would expect that the new
> settime64 ABI would work for both 32-bit and 64-bit applications, no?
>
i'm not quite sure about this part, clock_settime64 is specific for
32bit process with 64bit timespect running on a 64bit kernel.
compat_timespec is old_timespec32 in linux5.4.
chensong
>> +{
>> + struct timespec64 ts;
>> int ret;
>>
>> - ret = sys32_get_timespec(&ts, u_ts);
>> + ret = sys32_get_timespec64(&ts, u_ts);
>> if (ret)
>> return ret;
>>
>> diff --git a/kernel/cobalt/posix/syscall32.h b/kernel/cobalt/posix/syscall32.h
>> index 34904f9..32b87c4 100644
>> --- a/kernel/cobalt/posix/syscall32.h
>> +++ b/kernel/cobalt/posix/syscall32.h
>> @@ -57,7 +57,11 @@ COBALT_SYSCALL32emu_DECL(clock_getres,
>>
>> COBALT_SYSCALL32emu_DECL(clock_gettime,
>> (clockid_t clock_id,
>> - struct compat_timespec __user *u_ts));
>> + struct old_timespec32 __user *u_ts));
>> +
>> +COBALT_SYSCALL32emu_DECL(clock_settime64,
>> + (clockid_t clock_id,
>> + const struct __kernel_timespec __user *u_ts));
>>
>> COBALT_SYSCALL32emu_DECL(clock_settime,
>> (clockid_t clock_id,
>>
>
> Jan
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32
2020-11-11 5:50 ` chensong
@ 2020-11-11 7:34 ` Jan Kiszka
2020-11-11 9:55 ` chensong
0 siblings, 1 reply; 5+ messages in thread
From: Jan Kiszka @ 2020-11-11 7:34 UTC (permalink / raw)
To: chensong, xenomai, henning.schild
On 11.11.20 06:50, chensong wrote:
>
>
> On 2020年11月10日 18:17, Jan Kiszka wrote:
>>
>> On 03.11.20 04:05, chensong wrote:
>>> 1, introduce old_timespec32 for 32bit process with 32bit timespec
>>> 2, implement clock_settime64 for 32bit process with 64bit timespec
>>>
>>> Signed-off-by: chensong <chensong@tj.kylinos.cn>
>>> ---
>>> include/cobalt/kernel/compat.h | 6 ++++++
>>> kernel/cobalt/posix/compat.c | 20 ++++++++++++++++++++
>>> kernel/cobalt/posix/syscall32.c | 20 +++++++++++++++++---
>>> kernel/cobalt/posix/syscall32.h | 6 +++++-
>>> 4 files changed, 48 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/include/cobalt/kernel/compat.h
>>> b/include/cobalt/kernel/compat.h
>>> index 05754cb..adf8bae 100644
>>> --- a/include/cobalt/kernel/compat.h
>>> +++ b/include/cobalt/kernel/compat.h
>>> @@ -89,6 +89,12 @@ struct compat_rtdm_mmap_request {
>>> int sys32_get_timespec(struct timespec *ts,
>>> const struct compat_timespec __user *cts);
>>>
>>> +int sys32_get_timespec_old(struct timespec64 *ts,
>>> + const struct old_timespec32 __user *cts);
>>> +
>>> +int sys32_get_timespec64(struct timespec64 *ts,
>>> + const struct __kernel_timespec __user *cts);
>>> +
>>> int sys32_put_timespec(struct compat_timespec __user *cts,
>>> const struct timespec *ts);
>>>
>>> diff --git a/kernel/cobalt/posix/compat.c b/kernel/cobalt/posix/compat.c
>>> index 17968bf..3042dc0 100644
>>> --- a/kernel/cobalt/posix/compat.c
>>> +++ b/kernel/cobalt/posix/compat.c
>>> @@ -32,6 +32,26 @@ int sys32_get_timespec(struct timespec *ts,
>>> }
>>> EXPORT_SYMBOL_GPL(sys32_get_timespec);
>>>
>>> +int sys32_get_timespec_old(struct timespec64 *ts,
>>> + const struct old_timespec32 __user *cts)
>>> +{
>>> + return (cts == NULL ||
>>> + !access_rok(cts, sizeof(*cts)) ||
>>> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
>>> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
>>> +}
>>> +EXPORT_SYMBOL_GPL(sys32_get_timespec_old);
>>> +
>>> +int sys32_get_timespec64(struct timespec64 *ts,
>>> + const struct __kernel_timespec __user *cts)
>>> +{
>>> + return (cts == NULL ||
>>> + !access_rok(cts, sizeof(*cts)) ||
>>> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
>>> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
>>> +}
>>> +EXPORT_SYMBOL_GPL(sys32_get_timespec64);
>>> +
>>> int sys32_put_timespec(struct compat_timespec __user *cts,
>>> const struct timespec *ts)
>>> {
>>> diff --git a/kernel/cobalt/posix/syscall32.c
>>> b/kernel/cobalt/posix/syscall32.c
>>> index faa7ef5..47a8ad3 100644
>>> --- a/kernel/cobalt/posix/syscall32.c
>>> +++ b/kernel/cobalt/posix/syscall32.c
>>> @@ -159,12 +159,26 @@ COBALT_SYSCALL32emu(clock_gettime, current,
>>>
>>> COBALT_SYSCALL32emu(clock_settime, current,
>>> (clockid_t clock_id,
>>> - const struct compat_timespec __user *u_ts))
>>> + const struct old_timespec32 __user *u_ts))
>>> {
>>> - struct timespec ts;
>>> + struct timespec64 ts;
>>> + int ret;
>>> +
>>> + ret = sys32_get_timespec_old(&ts, u_ts);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + return __cobalt_clock_settime(clock_id, &ts);
>>> +}
>>> +
>>> +COBALT_SYSCALL32emu(clock_settime64, current,
>>> + (clockid_t clock_id,
>>> + const struct __kernel_timespec __user *u_ts))
>>
>> Hmm, do we need that as compat syscall? I would expect that the new
>> settime64 ABI would work for both 32-bit and 64-bit applications, no?
>>
> i'm not quite sure about this part, clock_settime64 is specific for
> 32bit process with 64bit timespect running on a 64bit kernel.
>
> compat_timespec is old_timespec32 in linux5.4.
Dont' believe me blindly on this, I'm also trying to understand the
matrix. My understanding is - as well - that clock_settime64 is only
interesting for that compat path (32-bit on 64-bit). So maybe that
other, common syscall declaration of patch 3 is redundant as our users
will only take this compat path?
Jan
--
Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32
2020-11-11 7:34 ` Jan Kiszka
@ 2020-11-11 9:55 ` chensong
0 siblings, 0 replies; 5+ messages in thread
From: chensong @ 2020-11-11 9:55 UTC (permalink / raw)
To: Jan Kiszka, xenomai, henning.schild
On 2020年11月11日 15:34, Jan Kiszka wrote:
> On 11.11.20 06:50, chensong wrote:
>>
>>
>> On 2020年11月10日 18:17, Jan Kiszka wrote:
>>>
>>> On 03.11.20 04:05, chensong wrote:
>>>> 1, introduce old_timespec32 for 32bit process with 32bit timespec
>>>> 2, implement clock_settime64 for 32bit process with 64bit timespec
>>>>
>>>> Signed-off-by: chensong <chensong@tj.kylinos.cn>
>>>> ---
>>>> include/cobalt/kernel/compat.h | 6 ++++++
>>>> kernel/cobalt/posix/compat.c | 20 ++++++++++++++++++++
>>>> kernel/cobalt/posix/syscall32.c | 20 +++++++++++++++++---
>>>> kernel/cobalt/posix/syscall32.h | 6 +++++-
>>>> 4 files changed, 48 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/include/cobalt/kernel/compat.h
>>>> b/include/cobalt/kernel/compat.h
>>>> index 05754cb..adf8bae 100644
>>>> --- a/include/cobalt/kernel/compat.h
>>>> +++ b/include/cobalt/kernel/compat.h
>>>> @@ -89,6 +89,12 @@ struct compat_rtdm_mmap_request {
>>>> int sys32_get_timespec(struct timespec *ts,
>>>> const struct compat_timespec __user *cts);
>>>>
>>>> +int sys32_get_timespec_old(struct timespec64 *ts,
>>>> + const struct old_timespec32 __user *cts);
>>>> +
>>>> +int sys32_get_timespec64(struct timespec64 *ts,
>>>> + const struct __kernel_timespec __user *cts);
>>>> +
>>>> int sys32_put_timespec(struct compat_timespec __user *cts,
>>>> const struct timespec *ts);
>>>>
>>>> diff --git a/kernel/cobalt/posix/compat.c b/kernel/cobalt/posix/compat.c
>>>> index 17968bf..3042dc0 100644
>>>> --- a/kernel/cobalt/posix/compat.c
>>>> +++ b/kernel/cobalt/posix/compat.c
>>>> @@ -32,6 +32,26 @@ int sys32_get_timespec(struct timespec *ts,
>>>> }
>>>> EXPORT_SYMBOL_GPL(sys32_get_timespec);
>>>>
>>>> +int sys32_get_timespec_old(struct timespec64 *ts,
>>>> + const struct old_timespec32 __user *cts)
>>>> +{
>>>> + return (cts == NULL ||
>>>> + !access_rok(cts, sizeof(*cts)) ||
>>>> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
>>>> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(sys32_get_timespec_old);
>>>> +
>>>> +int sys32_get_timespec64(struct timespec64 *ts,
>>>> + const struct __kernel_timespec __user *cts)
>>>> +{
>>>> + return (cts == NULL ||
>>>> + !access_rok(cts, sizeof(*cts)) ||
>>>> + __xn_get_user(ts->tv_sec, &cts->tv_sec) ||
>>>> + __xn_get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(sys32_get_timespec64);
>>>> +
>>>> int sys32_put_timespec(struct compat_timespec __user *cts,
>>>> const struct timespec *ts)
>>>> {
>>>> diff --git a/kernel/cobalt/posix/syscall32.c
>>>> b/kernel/cobalt/posix/syscall32.c
>>>> index faa7ef5..47a8ad3 100644
>>>> --- a/kernel/cobalt/posix/syscall32.c
>>>> +++ b/kernel/cobalt/posix/syscall32.c
>>>> @@ -159,12 +159,26 @@ COBALT_SYSCALL32emu(clock_gettime, current,
>>>>
>>>> COBALT_SYSCALL32emu(clock_settime, current,
>>>> (clockid_t clock_id,
>>>> - const struct compat_timespec __user *u_ts))
>>>> + const struct old_timespec32 __user *u_ts))
>>>> {
>>>> - struct timespec ts;
>>>> + struct timespec64 ts;
>>>> + int ret;
>>>> +
>>>> + ret = sys32_get_timespec_old(&ts, u_ts);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + return __cobalt_clock_settime(clock_id, &ts);
>>>> +}
>>>> +
>>>> +COBALT_SYSCALL32emu(clock_settime64, current,
>>>> + (clockid_t clock_id,
>>>> + const struct __kernel_timespec __user *u_ts))
>>>
>>> Hmm, do we need that as compat syscall? I would expect that the new
>>> settime64 ABI would work for both 32-bit and 64-bit applications, no?
>>>
>> i'm not quite sure about this part, clock_settime64 is specific for
>> 32bit process with 64bit timespect running on a 64bit kernel.
>>
>> compat_timespec is old_timespec32 in linux5.4.
>
> Dont' believe me blindly on this, I'm also trying to understand the
> matrix. My understanding is - as well - that clock_settime64 is only
> interesting for that compat path (32-bit on 64-bit). So maybe that
> other, common syscall declaration of patch 3 is redundant as our users
> will only take this compat path?
>
> Jan
>
patch 3 is not redundant, on the contrary, it's the most important one,
please don't drop it.
patch 4 is for 32bit process with 32bit lib running in 64bit kernel(too
complicated, is it?), but as our discussion, i don't think it's gonna
happen, how about we drop patch 4?
chensong
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-11-11 9:55 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-03 3:05 [PATCH 4/5] kernel/cobalt/posix/syscall32:introduce old_timespec32 and __kernel_timespec to clock_settime of syscall32 chensong
2020-11-10 10:17 ` Jan Kiszka
2020-11-11 5:50 ` chensong
2020-11-11 7:34 ` Jan Kiszka
2020-11-11 9:55 ` chensong
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