From 4d5f007eedb74d71a7bde2bff69b6a31ad8ab427 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 2 Jan 2019 13:28:47 +0100 Subject: time: make adjtime compat handling available for 32 bit We want to reuse the compat_timex handling on 32-bit architectures the same way we are using the compat handling for timespec when moving to 64-bit time_t. Move all definitions related to compat_timex out of the compat code into the normal timekeeping code, along with a rename to old_timex32, corresponding to the timespec/timeval structures, and make it controlled by CONFIG_COMPAT_32BIT_TIME, which 32-bit architectures will then select. Signed-off-by: Arnd Bergmann --- kernel/time/time.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 66 insertions(+), 4 deletions(-) (limited to 'kernel/time/time.c') diff --git a/kernel/time/time.c b/kernel/time/time.c index 2edb5088a70b..2d013bc2b271 100644 --- a/kernel/time/time.c +++ b/kernel/time/time.c @@ -278,20 +278,82 @@ SYSCALL_DEFINE1(adjtimex, struct timex __user *, txc_p) return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret; } -#ifdef CONFIG_COMPAT +#ifdef CONFIG_COMPAT_32BIT_TIME +int get_old_timex32(struct timex *txc, const struct old_timex32 __user *utp) +{ + struct old_timex32 tx32; + + memset(txc, 0, sizeof(struct timex)); + if (copy_from_user(&tx32, utp, sizeof(struct old_timex32))) + return -EFAULT; + + txc->modes = tx32.modes; + txc->offset = tx32.offset; + txc->freq = tx32.freq; + txc->maxerror = tx32.maxerror; + txc->esterror = tx32.esterror; + txc->status = tx32.status; + txc->constant = tx32.constant; + txc->precision = tx32.precision; + txc->tolerance = tx32.tolerance; + txc->time.tv_sec = tx32.time.tv_sec; + txc->time.tv_usec = tx32.time.tv_usec; + txc->tick = tx32.tick; + txc->ppsfreq = tx32.ppsfreq; + txc->jitter = tx32.jitter; + txc->shift = tx32.shift; + txc->stabil = tx32.stabil; + txc->jitcnt = tx32.jitcnt; + txc->calcnt = tx32.calcnt; + txc->errcnt = tx32.errcnt; + txc->stbcnt = tx32.stbcnt; + + return 0; +} + +int put_old_timex32(struct old_timex32 __user *utp, const struct timex *txc) +{ + struct old_timex32 tx32; + + memset(&tx32, 0, sizeof(struct old_timex32)); + tx32.modes = txc->modes; + tx32.offset = txc->offset; + tx32.freq = txc->freq; + tx32.maxerror = txc->maxerror; + tx32.esterror = txc->esterror; + tx32.status = txc->status; + tx32.constant = txc->constant; + tx32.precision = txc->precision; + tx32.tolerance = txc->tolerance; + tx32.time.tv_sec = txc->time.tv_sec; + tx32.time.tv_usec = txc->time.tv_usec; + tx32.tick = txc->tick; + tx32.ppsfreq = txc->ppsfreq; + tx32.jitter = txc->jitter; + tx32.shift = txc->shift; + tx32.stabil = txc->stabil; + tx32.jitcnt = txc->jitcnt; + tx32.calcnt = txc->calcnt; + tx32.errcnt = txc->errcnt; + tx32.stbcnt = txc->stbcnt; + tx32.tai = txc->tai; + if (copy_to_user(utp, &tx32, sizeof(struct old_timex32))) + return -EFAULT; + return 0; +} -COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp) +COMPAT_SYSCALL_DEFINE1(adjtimex, struct old_timex32 __user *, utp) { struct timex txc; int err, ret; - err = compat_get_timex(&txc, utp); + err = get_old_timex32(&txc, utp); if (err) return err; ret = do_adjtimex(&txc); - err = compat_put_timex(utp, &txc); + err = put_old_timex32(utp, &txc); if (err) return err; -- cgit v1.2.3-59-g8ed1b