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linux-user: Add support for a group of 2038 safe syscalls

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This patch implements functionality for following time64 syscalls:

*clock_getres_time64

     This a year 2038 safe variant of syscall:

     int clock_getres(clockid_t clockid, struct timespec *res)
     --finding the resoultion of a specified clock--
     man page: https://man7.org/linux/man-pages/man2/clock_getres.2.html

*timer_gettime64
*timer_settime64

     These are year 2038 safe variants of syscalls:

     int timer_settime(timer_t timerid, int flags,
                       const struct itimerspec *new_value,
                       struct itimerspec *old_value)
     int timer_gettime(timer_t timerid, struct itimerspec *curr_value)
     --arming/dissarming and fetching state of POSIX per-process timer--
     man page: https://man7.org/linux/man-pages/man2/timer_settime.2.html

*timerfd_gettime64
*timerfd_settime64

     These are year 2038 safe variants of syscalls:

     int timerfd_settime(int fd, int flags,
                         const struct itimerspec *new_value,
                         struct itimerspec *old_value)
     int timerfd_gettime(int fd, struct itimerspec *curr_value)
     --timers that notify via file descriptor--
     man page: https://man7.org/linux/man-pages/man2/timerfd_settime.2.html

Implementation notes:

     Syscall 'clock_getres_time64' was implemented similarly to 'clock_getres()'.
     The only difference was that for the conversion of 'struct timespec' from
     host to target, function 'host_to_target_timespec64()' was used instead of
     'host_to_target_timespec()'.

     For other syscalls, new functions 'host_to_target_itimerspec64()' and
     'target_to_host_itimerspec64()' were added to convert the value of the
     'struct itimerspec' from host to target and vice versa. A new type
     'struct target__kernel_itimerspec' was added in 'syscall_defs.h'. This
     type was defined with fields which are of the already defined type
     'struct target_timespec'. This new 'struct target__kernel_itimerspec'
     type is used in these new converting functions. These new functions were
     defined similarly to 'host_to_target_itimerspec()' and 'target_to_host_itimerspec()'
     the only difference being that 'target_to_host_timespec64()' and
     'host_to_target_timespec64()' were used.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200722153421.295411-3-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Filip Bozuta 2020-07-22 17:34:21 +02:00 committed by Laurent Vivier
parent 2c86c90fe8
commit 828cb3a1a8
2 changed files with 143 additions and 1 deletions
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139
linux-user/syscall.c
View file

@ -1247,7 +1247,9 @@ static inline abi_long target_to_host_timespec(struct timespec *host_ts,
}
#endif
#if defined(TARGET_NR_clock_settime64) || defined(TARGET_NR_futex_time64)
#if defined(TARGET_NR_clock_settime64) || defined(TARGET_NR_futex_time64) || \
defined(TARGET_NR_timer_settime64) || \
(defined(TARGET_NR_timerfd_settime64) && defined(CONFIG_TIMERFD))
static inline abi_long target_to_host_timespec64(struct timespec *host_ts,
abi_ulong target_addr)
{
@ -6801,6 +6803,24 @@ static inline abi_long target_to_host_itimerspec(struct itimerspec *host_its,
}
#endif
#if defined(TARGET_NR_timer_settime64) || \
(defined(TARGET_NR_timerfd_settime64) && defined(CONFIG_TIMERFD))
static inline abi_long target_to_host_itimerspec64(struct itimerspec *host_its,
abi_ulong target_addr)
{
if (target_to_host_timespec64(&host_its->it_interval, target_addr +
offsetof(struct target__kernel_itimerspec,
it_interval)) ||
target_to_host_timespec64(&host_its->it_value, target_addr +
offsetof(struct target__kernel_itimerspec,
it_value))) {
return -TARGET_EFAULT;
}
return 0;
}
#endif
#if ((defined(TARGET_NR_timerfd_gettime) || \
defined(TARGET_NR_timerfd_settime)) && defined(CONFIG_TIMERFD)) || \
defined(TARGET_NR_timer_gettime) || defined(TARGET_NR_timer_settime)
@ -6819,6 +6839,26 @@ static inline abi_long host_to_target_itimerspec(abi_ulong target_addr,
}
#endif
#if ((defined(TARGET_NR_timerfd_gettime64) || \
defined(TARGET_NR_timerfd_settime64)) && defined(CONFIG_TIMERFD)) || \
defined(TARGET_NR_timer_gettime64) || defined(TARGET_NR_timer_settime64)
static inline abi_long host_to_target_itimerspec64(abi_ulong target_addr,
struct itimerspec *host_its)
{
if (host_to_target_timespec64(target_addr +
offsetof(struct target__kernel_itimerspec,
it_interval),
&host_its->it_interval) ||
host_to_target_timespec64(target_addr +
offsetof(struct target__kernel_itimerspec,
it_value),
&host_its->it_value)) {
return -TARGET_EFAULT;
}
return 0;
}
#endif
#if defined(TARGET_NR_adjtimex) || \
(defined(TARGET_NR_clock_adjtime) && defined(CONFIG_CLOCK_ADJTIME))
static inline abi_long target_to_host_timex(struct timex *host_tx,
@ -11811,6 +11851,17 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
return ret;
}
#endif
#ifdef TARGET_NR_clock_getres_time64
case TARGET_NR_clock_getres_time64:
{
struct timespec ts;
ret = get_errno(clock_getres(arg1, &ts));
if (!is_error(ret)) {
host_to_target_timespec64(arg2, &ts);
}
return ret;
}
#endif
#ifdef TARGET_NR_clock_nanosleep
case TARGET_NR_clock_nanosleep:
{
@ -12405,6 +12456,32 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
}
#endif
#ifdef TARGET_NR_timer_settime64
case TARGET_NR_timer_settime64:
{
target_timer_t timerid = get_timer_id(arg1);
if (timerid < 0) {
ret = timerid;
} else if (arg3 == 0) {
ret = -TARGET_EINVAL;
} else {
timer_t htimer = g_posix_timers[timerid];
struct itimerspec hspec_new = {{0},}, hspec_old = {{0},};
if (target_to_host_itimerspec64(&hspec_new, arg3)) {
return -TARGET_EFAULT;
}
ret = get_errno(
timer_settime(htimer, arg2, &hspec_new, &hspec_old));
if (arg4 && host_to_target_itimerspec64(arg4, &hspec_old)) {
return -TARGET_EFAULT;
}
}
return ret;
}
#endif
#ifdef TARGET_NR_timer_gettime
case TARGET_NR_timer_gettime:
{
@ -12428,6 +12505,29 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
}
#endif
#ifdef TARGET_NR_timer_gettime64
case TARGET_NR_timer_gettime64:
{
/* args: timer_t timerid, struct itimerspec64 *curr_value */
target_timer_t timerid = get_timer_id(arg1);
if (timerid < 0) {
ret = timerid;
} else if (!arg2) {
ret = -TARGET_EFAULT;
} else {
timer_t htimer = g_posix_timers[timerid];
struct itimerspec hspec;
ret = get_errno(timer_gettime(htimer, &hspec));
if (host_to_target_itimerspec64(arg2, &hspec)) {
ret = -TARGET_EFAULT;
}
}
return ret;
}
#endif
#ifdef TARGET_NR_timer_getoverrun
case TARGET_NR_timer_getoverrun:
{
@ -12481,6 +12581,20 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
return ret;
#endif
#if defined(TARGET_NR_timerfd_gettime64) && defined(CONFIG_TIMERFD)
case TARGET_NR_timerfd_gettime64:
{
struct itimerspec its_curr;
ret = get_errno(timerfd_gettime(arg1, &its_curr));
if (arg2 && host_to_target_itimerspec64(arg2, &its_curr)) {
return -TARGET_EFAULT;
}
}
return ret;
#endif
#if defined(TARGET_NR_timerfd_settime) && defined(CONFIG_TIMERFD)
case TARGET_NR_timerfd_settime:
{
@ -12504,6 +12618,29 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
return ret;
#endif
#if defined(TARGET_NR_timerfd_settime64) && defined(CONFIG_TIMERFD)
case TARGET_NR_timerfd_settime64:
{
struct itimerspec its_new, its_old, *p_new;
if (arg3) {
if (target_to_host_itimerspec64(&its_new, arg3)) {
return -TARGET_EFAULT;
}
p_new = &its_new;
} else {
p_new = NULL;
}
ret = get_errno(timerfd_settime(arg1, arg2, p_new, &its_old));
if (arg4 && host_to_target_itimerspec64(arg4, &its_old)) {
return -TARGET_EFAULT;
}
}
return ret;
#endif
#if defined(TARGET_NR_ioprio_get) && defined(__NR_ioprio_get)
case TARGET_NR_ioprio_get:
return get_errno(ioprio_get(arg1, arg2));

5
linux-user/syscall_defs.h
View file

@ -259,6 +259,11 @@ struct target_itimerspec {
struct target_timespec it_value;
};
struct target__kernel_itimerspec {
struct target__kernel_timespec it_interval;
struct target__kernel_timespec it_value;
};
struct target_timex {
abi_uint modes; /* Mode selector */
abi_long offset; /* Time offset */