diff options
| -rw-r--r-- | include/linux/compat.h | 16 | ||||
| -rw-r--r-- | kernel/compat.c | 68 |
2 files changed, 76 insertions, 8 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h index 1be91c048249..a82e452bbdb9 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -87,10 +87,26 @@ typedef struct { compat_sigset_word sig[_COMPAT_NSIG_WORDS]; } compat_sigset_t; +/* + * These functions operate strictly on struct compat_time* + */ extern int get_compat_timespec(struct timespec *, const struct compat_timespec __user *); extern int put_compat_timespec(const struct timespec *, struct compat_timespec __user *); +extern int get_compat_timeval(struct timeval *, + const struct compat_timeval __user *); +extern int put_compat_timeval(const struct timeval *, + struct compat_timeval __user *); +/* + * These functions operate on 32- or 64-bit specs depending on + * COMPAT_USE_64BIT_TIME, hence the void user pointer arguments and the + * naming as compat_get/put_ rather than get/put_compat_. + */ +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 *); struct compat_iovec { compat_uptr_t iov_base; diff --git a/kernel/compat.c b/kernel/compat.c index f346cedfe24d..74ff8498809a 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -31,11 +31,10 @@ #include <asm/uaccess.h> /* - * Note that the native side is already converted to a timespec, because - * that's what we want anyway. + * Get/set struct timeval with struct timespec on the native side */ -static int compat_get_timeval(struct timespec *o, - struct compat_timeval __user *i) +static int compat_get_timeval_convert(struct timespec *o, + struct compat_timeval __user *i) { long usec; @@ -46,8 +45,8 @@ static int compat_get_timeval(struct timespec *o, return 0; } -static int compat_put_timeval(struct compat_timeval __user *o, - struct timeval *i) +static int compat_put_timeval_convert(struct compat_timeval __user *o, + struct timeval *i) { return (put_user(i->tv_sec, &o->tv_sec) || put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; @@ -117,7 +116,7 @@ asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, if (tv) { struct timeval ktv; do_gettimeofday(&ktv); - if (compat_put_timeval(tv, &ktv)) + if (compat_put_timeval_convert(tv, &ktv)) return -EFAULT; } if (tz) { @@ -135,7 +134,7 @@ asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, struct timezone ktz; if (tv) { - if (compat_get_timeval(&kts, tv)) + if (compat_get_timeval_convert(&kts, tv)) return -EFAULT; } if (tz) { @@ -146,12 +145,29 @@ asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); } +int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) +{ + return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || + __get_user(tv->tv_sec, &ctv->tv_sec) || + __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; +} +EXPORT_SYMBOL_GPL(get_compat_timeval); + +int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) +{ + return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || + __put_user(tv->tv_sec, &ctv->tv_sec) || + __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; +} +EXPORT_SYMBOL_GPL(put_compat_timeval); + int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) { return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || __get_user(ts->tv_sec, &cts->tv_sec) || __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; } +EXPORT_SYMBOL_GPL(get_compat_timespec); int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) { @@ -161,6 +177,42 @@ int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user } EXPORT_SYMBOL_GPL(put_compat_timespec); +int compat_get_timeval(struct timeval *tv, const void __user *utv) +{ + if (COMPAT_USE_64BIT_TIME) + return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0; + else + return get_compat_timeval(tv, utv); +} +EXPORT_SYMBOL_GPL(compat_get_timeval); + +int compat_put_timeval(const struct timeval *tv, void __user *utv) +{ + if (COMPAT_USE_64BIT_TIME) + return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0; + else + return put_compat_timeval(tv, utv); +} +EXPORT_SYMBOL_GPL(compat_put_timeval); + +int compat_get_timespec(struct timespec *ts, const void __user *uts) +{ + if (COMPAT_USE_64BIT_TIME) + return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0; + else + return get_compat_timespec(ts, uts); +} +EXPORT_SYMBOL_GPL(compat_get_timespec); + +int compat_put_timespec(const struct timespec *ts, void __user *uts) +{ + if (COMPAT_USE_64BIT_TIME) + return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0; + else + return put_compat_timespec(ts, uts); +} +EXPORT_SYMBOL_GPL(compat_put_timespec); + static long compat_nanosleep_restart(struct restart_block *restart) { struct compat_timespec __user *rmtp; |