* [PATCH] posix-timers: Fix clock_adjtime to return timex data on success
@ 2013-01-10 17:12 Miroslav Lichvar
2013-01-10 20:12 ` Richard Cochran
0 siblings, 1 reply; 5+ messages in thread
From: Miroslav Lichvar @ 2013-01-10 17:12 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner, Richard Cochran, Miroslav Lichvar
Copy the modified timex data back to the user also with positive return
values. This fixes reading of the CLOCK_REALTIME timex data when the
clock is in a non-zero state.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
---
kernel/posix-timers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 69185ae..10349d5 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -997,7 +997,7 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
err = kc->clock_adj(which_clock, &ktx);
- if (!err && copy_to_user(utx, &ktx, sizeof(ktx)))
+ if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
return -EFAULT;
return err;
--
1.7.11.7
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] posix-timers: Fix clock_adjtime to return timex data on success
2013-01-10 17:12 [PATCH] posix-timers: Fix clock_adjtime to return timex data on success Miroslav Lichvar
@ 2013-01-10 20:12 ` Richard Cochran
2013-01-10 20:27 ` John Stultz
0 siblings, 1 reply; 5+ messages in thread
From: Richard Cochran @ 2013-01-10 20:12 UTC (permalink / raw)
To: Miroslav Lichvar; +Cc: linux-kernel, Thomas Gleixner, John Stultz
On Thu, Jan 10, 2013 at 06:12:02PM +0100, Miroslav Lichvar wrote:
> Copy the modified timex data back to the user also with positive return
> values. This fixes reading of the CLOCK_REALTIME timex data when the
> clock is in a non-zero state.
>
> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
(Adding John Stultz on CC)
> ---
> kernel/posix-timers.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
> index 69185ae..10349d5 100644
> --- a/kernel/posix-timers.c
> +++ b/kernel/posix-timers.c
> @@ -997,7 +997,7 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
>
> err = kc->clock_adj(which_clock, &ktx);
>
> - if (!err && copy_to_user(utx, &ktx, sizeof(ktx)))
> + if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
> return -EFAULT;
>
> return err;
> --
> 1.7.11.7
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] posix-timers: Fix clock_adjtime to return timex data on success
2013-01-10 20:12 ` Richard Cochran
@ 2013-01-10 20:27 ` John Stultz
2013-01-11 10:58 ` [PATCHv2] posix-timers: Fix clock_adjtime to always " Miroslav Lichvar
0 siblings, 1 reply; 5+ messages in thread
From: John Stultz @ 2013-01-10 20:27 UTC (permalink / raw)
To: Richard Cochran; +Cc: Miroslav Lichvar, linux-kernel, Thomas Gleixner
On 01/10/2013 12:12 PM, Richard Cochran wrote:
> On Thu, Jan 10, 2013 at 06:12:02PM +0100, Miroslav Lichvar wrote:
>> Copy the modified timex data back to the user also with positive return
>> values. This fixes reading of the CLOCK_REALTIME timex data when the
>> clock is in a non-zero state.
>>
>> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
> Acked-by: Richard Cochran <richardcochran@gmail.com>
>
> (Adding John Stultz on CC)
Just to clarify (the commit message makes it pretty hard to understand
exactly what's going wrong), this is to handle the case where
clock_adj() returns a non-zero time_state value (such as TIME_INS) ?
thanks
-john
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCHv2] posix-timers: Fix clock_adjtime to always return timex data on success
2013-01-10 20:27 ` John Stultz
@ 2013-01-11 10:58 ` Miroslav Lichvar
2013-01-12 2:29 ` John Stultz
0 siblings, 1 reply; 5+ messages in thread
From: Miroslav Lichvar @ 2013-01-11 10:58 UTC (permalink / raw)
To: linux-kernel
Cc: John Stultz, Thomas Gleixner, Richard Cochran, Miroslav Lichvar
The clock_adj call returns the clock state on success, which may be a
non-zero value (e.g. TIME_INS), but the modified timex data is copied
back to the user only when zero value (TIME_OK) was returned. Fix the
condition to copy the data also with positive return values.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
---
kernel/posix-timers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 69185ae..10349d5 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -997,7 +997,7 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
err = kc->clock_adj(which_clock, &ktx);
- if (!err && copy_to_user(utx, &ktx, sizeof(ktx)))
+ if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
return -EFAULT;
return err;
--
1.7.11.7
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCHv2] posix-timers: Fix clock_adjtime to always return timex data on success
2013-01-11 10:58 ` [PATCHv2] posix-timers: Fix clock_adjtime to always " Miroslav Lichvar
@ 2013-01-12 2:29 ` John Stultz
0 siblings, 0 replies; 5+ messages in thread
From: John Stultz @ 2013-01-12 2:29 UTC (permalink / raw)
To: Miroslav Lichvar; +Cc: linux-kernel, Thomas Gleixner, Richard Cochran
On 01/11/2013 02:58 AM, Miroslav Lichvar wrote:
> The clock_adj call returns the clock state on success, which may be a
> non-zero value (e.g. TIME_INS), but the modified timex data is copied
> back to the user only when zero value (TIME_OK) was returned. Fix the
> condition to copy the data also with positive return values.
>
> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Thanks for the resend. I've got this in my queue for 3.9
thanks
-john
^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-01-10 17:12 [PATCH] posix-timers: Fix clock_adjtime to return timex data on success Miroslav Lichvar
2013-01-10 20:12 ` Richard Cochran
2013-01-10 20:27 ` John Stultz
2013-01-11 10:58 ` [PATCHv2] posix-timers: Fix clock_adjtime to always " Miroslav Lichvar
2013-01-12 2:29 ` John Stultz
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