Y2038

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Re: [Y2038] [RFC PATCH v2 1/4] y2038: add 64bit time_t support in timeval for 32bit architecture

by Bamvor Zhang Jian

Hi, John On 07/09/2015 04:09 AM, John Stultz wrote: > On Mon, Jun 29, 2015 at 7:23 AM, Bamvor Zhang Jian > <bamvor.zhangjian(a)linaro.org> wrote: >> +int get_timeval64(struct timeval64 *tv, >> + const struct __kernel_timeval __user *utv) >> +{ >> + struct __kernel_timeval ktv; >> + int ret; >> + >> + ret = copy_from_user(&ktv, utv, sizeof(ktv)); >> + if (ret) >> + return -EFAULT; >> + >> + tv->tv_sec = ktv.tv_sec; >> + if (!IS_ENABLED(CONFIG_64BIT) >> +#ifdef CONFIG_COMPAT >> + || is_compat_task() >> +#endif > > These sorts of ifdefs are to be avoided inside of functions. > Instead, it seems is_compat_task() should be defined to 0 in the > !CONFIG_COMPAT case, so you can avoid the ifdefs and the compiler can > still optimize it out. I add this ifdef because I got compile failure on arm platform. This file do not include the <linux/compat.h> directly. And in arm64, compat.h is included implicitily. So, I am not sure what I should do here. Include <linux/compat.h> in this file directly or add a this check at the beginning of this file? #ifndef is_compat_task #define is_compat_task() (0) #endif > Otherwise this looks similar to a patch Baolin (cc'ed) has been working on. Yes. regards bamvor > > thanks > -john >

10 years, 6 months

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10 years, 7 months

Re: [Y2038] [RFC PATCH v2 4/4] y2038: convert ppdev to 2038 safe

by Arnd Bergmann

On Monday 29 June 2015 22:23:27 Bamvor Zhang Jian wrote: > diff --git a/include/uapi/linux/ppdev.h b/include/uapi/linux/ppdev.h > index dc18c5d..d62a47d 100644 > --- a/include/uapi/linux/ppdev.h > +++ b/include/uapi/linux/ppdev.h > @@ -74,8 +74,18 @@ struct ppdev_frob_struct { > #define PPSETPHASE _IOW(PP_IOCTL, 0x94, int) > > /* Set and get port timeout (struct timeval's) */ > -#define PPGETTIME _IOR(PP_IOCTL, 0x95, struct timeval) > -#define PPSETTIME _IOW(PP_IOCTL, 0x96, struct timeval) > +/* Force application use 64 time_t ioctl */ > +/* TODO: It is an open question about we should use a __xxx_timeval or an > + * implicit array. > + * replace struct __kernel_timeval with __s32[4] > + * replace struct compat_timeval with __s32[2] > + */ > +#define PPGETTIME PPGETTIME64 > +#define PPSETTIME PPSETTIME64 > +#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, struct __kernel_timeval) > +#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, struct __kernel_timeval) > +#define PPGETTIME32 _IOR(PP_IOCTL, 0x9c, struct __kernel_compat_timeval) > +#define PPSETTIME32 _IOW(PP_IOCTL, 0x9d, struct __kernel_compat_timeval) As commented before, these definitions should probably not be part of the user-visible header file. The main reason for using an __s64[2] array instead of struct __kernel_timeval is to avoid adding __kernel_timeval: 'timeval' is thoroughly deprecated and we don't want to establish new interfaces with that. In case of this driver, nobody would ever want to change their user space to use a 64-bit __kernel_timeval instead of timeval and explicitly call PPGETTIME64 instead of PPGETTIME, because we are only dealing with an interval here, and a 32-bit second value is sufficient to represent that. Instead, the purpose of your patch is to make the kernel cope with user space that happens to use a 64-bit time_t based definition of 'struct timeval' and passes that to the ioctl. Arnd [re-sent with fixed y2038 list]

10 years, 7 months

Re: [Y2038] [RFC PATCH v2 3/4] ppdev: add compat ioctl

by John Stultz

On Mon, Jun 29, 2015 at 7:23 AM, Bamvor Zhang Jian <bamvor.zhangjian(a)linaro.org> wrote: > Add compat ioctl in ppdev in order to solve the y2038 issue in > later patch. > This patch simply add pp_do_ioctl to compat_ioctl, because I found > that all the ioctl access the arg as a pointer. > > Signed-off-by: Bamvor Zhang Jian <bamvor.zhangjian(a)linaro.org> > --- > drivers/char/ppdev.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c > index ae0b42b..9207658 100644 > --- a/drivers/char/ppdev.c > +++ b/drivers/char/ppdev.c > @@ -69,6 +69,7 @@ > #include <linux/ppdev.h> > #include <linux/mutex.h> > #include <linux/uaccess.h> > +#include <linux/compat.h> > > #define PP_VERSION "ppdev: user-space parallel port driver" > #define CHRDEV "ppdev" > @@ -635,6 +636,11 @@ static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) > return ret; > } > > +static long pp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) > +{ > + return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); > +} > + > static int pp_open (struct inode * inode, struct file * file) > { > unsigned int minor = iminor(inode); > @@ -744,6 +750,9 @@ static const struct file_operations pp_fops = { > .write = pp_write, > .poll = pp_poll, > .unlocked_ioctl = pp_ioctl, > +#ifdef CONFIG_COMPAT > + .compat_ioctl = pp_compat_ioctl, > +#endif Does adding this patch w/o the following patch break 32bit apps using this on 64bit kernels? thanks -john

10 years, 7 months

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10 years, 7 months

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10 years, 7 months

Re: [Y2038] [RFC PATCH v2 0/4] Convert ppdev to y2038 safe

by Bamvor Zhang Jian

fix wrong list name for linaro y2038. On 29, Jun 22:26 "Bamvor Zhang Jian" <bamvor.zhangjian(a)linaro.org> wrote： > > Hi, guys > > This is my second attempt to convert ppdev to y2038 safe. The first > version is here[1]. > > There are two parts in my patches. > 01/02 migrate timeval relative struct to 64bit time_t types. > 03/04 convert ppdev to y2038 safe in both native 32bit and compat > application. > > My patches try to follow the idea from arnd y2038 syscalls patches[2], > but my patches not depend on them. > > The reason why I choose ppdev is the ppdev use the timexxx directly > in ioctl compare with the other drivers embedded timexxx in their > own type. > > Build pass on arm and arm64 on each patches(with and without > CONFIG_COMPAT_TIME). Unfortunately, there is no parport device > (printer) in my test environment. Hope others could help to test > it. > > [1] https://lists.linaro.org/pipermail/y2038/2015-June/000522.html > [2] http://git.kernel.org/cgit/linux/kernel/git/arnd/playground.git/log/?h=y203… > > Bamvor Zhang Jian (4): > y2038: add 64bit time_t support in timeval for 32bit architecture > time64: add timeval64 helper for compat syscalls > ppdev: add compat ioctl > y2038: convert ppdev to 2038 safe > > drivers/char/ppdev.c | 41 ++++++++++++++++++++++++++++++++++------- > include/linux/compat.h | 3 +++ > include/linux/time64.h | 20 ++++++++++++++++++-- > include/uapi/linux/ppdev.h | 14 ++++++++++++-- > include/uapi/linux/time.h | 16 ++++++++++++++++ > kernel/compat.c | 17 +++++++++++++++++ > kernel/time/time.c | 36 ++++++++++++++++++++++++++++++++++++ > 7 files changed, 136 insertions(+), 11 deletions(-) > > -- > 2.1.4 >

10 years, 7 months

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10 years, 7 months

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10 years, 7 months

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10 years, 7 months

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