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[PULL 1/5] linux-user: Add support for ppoll_time64() and pselect6_time6
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From: |
Laurent Vivier |
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Subject: |
[PULL 1/5] linux-user: Add support for ppoll_time64() and pselect6_time64() |
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Date: |
Mon, 7 Sep 2020 11:17:44 +0200 |
From: Filip Bozuta <Filip.Bozuta@syrmia.com>
This patch introduces functionality for following time64 syscalls:
*ppoll_time64
This is a year 2038 safe variant of:
int poll(struct pollfd *fds, nfds_t nfds, int timeout)
-- wait for some event on a file descriptor --
man page: https://man7.org/linux/man-pages/man2/ppoll.2.html
*pselect6_time64
This is a year 2038 safe variant of:
int pselect6(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, const struct timespec *timeout,
const sigset_t *sigmask);
-- synchronous I/O multiplexing --
man page: https://man7.org/linux/man-pages/man2/pselect6.2.html
Implementation notes:
Year 2038 safe syscalls in this patch were implemented
with the same code as their regular variants (ppoll() and pselect()).
This code was moved to new functions ('do_ppoll()' and 'do_pselect6()')
that take a 'bool time64' from which a right 'struct timespec' converting
function is called.
(target_to_host/host_to_target_timespec() for regular and
target_to_host/host_to_target_timespec64() for time64 variants)
Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200824223050.92032-2-Filip.Bozuta@syrmia.com>
[lv: rebase and fix do_pselect6()]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/syscall.c | 460 +++++++++++++++++++++++--------------------
1 file changed, 250 insertions(+), 210 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 93da3b972852..07220eee40c5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -728,11 +728,11 @@ safe_syscall5(int, waitid, idtype_t, idtype, id_t, id,
siginfo_t *, infop, \
int, options, struct rusage *, rusage)
safe_syscall3(int, execve, const char *, filename, char **, argv, char **,
envp)
#if defined(TARGET_NR_select) || defined(TARGET_NR__newselect) || \
- defined(TARGET_NR_pselect6)
+ defined(TARGET_NR_pselect6) || defined(TARGET_NR_pselect6_time64)
safe_syscall6(int, pselect6, int, nfds, fd_set *, readfds, fd_set *, writefds,
\
fd_set *, exceptfds, struct timespec *, timeout, void *, sig)
#endif
-#if defined(TARGET_NR_ppoll) || defined(TARGET_NR_poll)
+#if defined(TARGET_NR_ppoll) || defined(TARGET_NR_ppoll_time64)
safe_syscall5(int, ppoll, struct pollfd *, ufds, unsigned int, nfds,
struct timespec *, tsp, const sigset_t *, sigmask,
size_t, sigsetsize)
@@ -952,7 +952,7 @@ abi_long do_brk(abi_ulong new_brk)
}
#if defined(TARGET_NR_select) || defined(TARGET_NR__newselect) || \
- defined(TARGET_NR_pselect6)
+ defined(TARGET_NR_pselect6) || defined(TARGET_NR_pselect6_time64)
static inline abi_long copy_from_user_fdset(fd_set *fds,
abi_ulong target_fds_addr,
int n)
@@ -1250,7 +1250,8 @@ static inline abi_long target_to_host_timespec(struct
timespec *host_ts,
defined(TARGET_NR_rt_sigtimedwait_time64) || \
defined(TARGET_NR_utimensat) || \
defined(TARGET_NR_utimensat_time64) || \
- defined(TARGET_NR_semtimedop_time64)
+ defined(TARGET_NR_semtimedop_time64) || \
+ defined(TARGET_NR_pselect6_time64) || defined(TARGET_NR_ppoll_time64)
static inline abi_long target_to_host_timespec64(struct timespec *host_ts,
abi_ulong target_addr)
{
@@ -1458,6 +1459,237 @@ static abi_long do_old_select(abi_ulong arg1)
#endif
#endif
+#if defined(TARGET_NR_pselect6) || defined(TARGET_NR_pselect6_time64)
+static abi_long do_pselect6(abi_long arg1, abi_long arg2, abi_long arg3,
+ abi_long arg4, abi_long arg5, abi_long arg6,
+ bool time64)
+{
+ abi_long rfd_addr, wfd_addr, efd_addr, n, ts_addr;
+ fd_set rfds, wfds, efds;
+ fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
+ struct timespec ts, *ts_ptr;
+ abi_long ret;
+
+ /*
+ * The 6th arg is actually two args smashed together,
+ * so we cannot use the C library.
+ */
+ sigset_t set;
+ struct {
+ sigset_t *set;
+ size_t size;
+ } sig, *sig_ptr;
+
+ abi_ulong arg_sigset, arg_sigsize, *arg7;
+ target_sigset_t *target_sigset;
+
+ n = arg1;
+ rfd_addr = arg2;
+ wfd_addr = arg3;
+ efd_addr = arg4;
+ ts_addr = arg5;
+
+ ret = copy_from_user_fdset_ptr(&rfds, &rfds_ptr, rfd_addr, n);
+ if (ret) {
+ return ret;
+ }
+ ret = copy_from_user_fdset_ptr(&wfds, &wfds_ptr, wfd_addr, n);
+ if (ret) {
+ return ret;
+ }
+ ret = copy_from_user_fdset_ptr(&efds, &efds_ptr, efd_addr, n);
+ if (ret) {
+ return ret;
+ }
+
+ /*
+ * This takes a timespec, and not a timeval, so we cannot
+ * use the do_select() helper ...
+ */
+ if (ts_addr) {
+ if (time64) {
+ if (target_to_host_timespec64(&ts, ts_addr)) {
+ return -TARGET_EFAULT;
+ }
+ } else {
+ if (target_to_host_timespec(&ts, ts_addr)) {
+ return -TARGET_EFAULT;
+ }
+ }
+ ts_ptr = &ts;
+ } else {
+ ts_ptr = NULL;
+ }
+
+ /* Extract the two packed args for the sigset */
+ if (arg6) {
+ sig_ptr = &sig;
+ sig.size = SIGSET_T_SIZE;
+
+ arg7 = lock_user(VERIFY_READ, arg6, sizeof(*arg7) * 2, 1);
+ if (!arg7) {
+ return -TARGET_EFAULT;
+ }
+ arg_sigset = tswapal(arg7[0]);
+ arg_sigsize = tswapal(arg7[1]);
+ unlock_user(arg7, arg6, 0);
+
+ if (arg_sigset) {
+ sig.set = &set;
+ if (arg_sigsize != sizeof(*target_sigset)) {
+ /* Like the kernel, we enforce correct size sigsets */
+ return -TARGET_EINVAL;
+ }
+ target_sigset = lock_user(VERIFY_READ, arg_sigset,
+ sizeof(*target_sigset), 1);
+ if (!target_sigset) {
+ return -TARGET_EFAULT;
+ }
+ target_to_host_sigset(&set, target_sigset);
+ unlock_user(target_sigset, arg_sigset, 0);
+ } else {
+ sig.set = NULL;
+ }
+ } else {
+ sig_ptr = NULL;
+ }
+
+ ret = get_errno(safe_pselect6(n, rfds_ptr, wfds_ptr, efds_ptr,
+ ts_ptr, sig_ptr));
+
+ if (!is_error(ret)) {
+ if (rfd_addr && copy_to_user_fdset(rfd_addr, &rfds, n)) {
+ return -TARGET_EFAULT;
+ }
+ if (wfd_addr && copy_to_user_fdset(wfd_addr, &wfds, n)) {
+ return -TARGET_EFAULT;
+ }
+ if (efd_addr && copy_to_user_fdset(efd_addr, &efds, n)) {
+ return -TARGET_EFAULT;
+ }
+ if (time64) {
+ if (ts_addr && host_to_target_timespec64(ts_addr, &ts)) {
+ return -TARGET_EFAULT;
+ }
+ } else {
+ if (ts_addr && host_to_target_timespec(ts_addr, &ts)) {
+ return -TARGET_EFAULT;
+ }
+ }
+ }
+ return ret;
+}
+#endif
+
+#if defined(TARGET_NR_poll) || defined(TARGET_NR_ppoll) || \
+ defined(TARGET_NR_ppoll_time64)
+static abi_long do_ppoll(abi_long arg1, abi_long arg2, abi_long arg3,
+ abi_long arg4, abi_long arg5, bool ppoll, bool time64)
+{
+ struct target_pollfd *target_pfd;
+ unsigned int nfds = arg2;
+ struct pollfd *pfd;
+ unsigned int i;
+ abi_long ret;
+
+ pfd = NULL;
+ target_pfd = NULL;
+ if (nfds) {
+ if (nfds > (INT_MAX / sizeof(struct target_pollfd))) {
+ return -TARGET_EINVAL;
+ }
+ target_pfd = lock_user(VERIFY_WRITE, arg1,
+ sizeof(struct target_pollfd) * nfds, 1);
+ if (!target_pfd) {
+ return -TARGET_EFAULT;
+ }
+
+ pfd = alloca(sizeof(struct pollfd) * nfds);
+ for (i = 0; i < nfds; i++) {
+ pfd[i].fd = tswap32(target_pfd[i].fd);
+ pfd[i].events = tswap16(target_pfd[i].events);
+ }
+ }
+ if (ppoll) {
+ struct timespec _timeout_ts, *timeout_ts = &_timeout_ts;
+ target_sigset_t *target_set;
+ sigset_t _set, *set = &_set;
+
+ if (arg3) {
+ if (time64) {
+ if (target_to_host_timespec64(timeout_ts, arg3)) {
+ unlock_user(target_pfd, arg1, 0);
+ return -TARGET_EFAULT;
+ }
+ } else {
+ if (target_to_host_timespec(timeout_ts, arg3)) {
+ unlock_user(target_pfd, arg1, 0);
+ return -TARGET_EFAULT;
+ }
+ }
+ } else {
+ timeout_ts = NULL;
+ }
+
+ if (arg4) {
+ if (arg5 != sizeof(target_sigset_t)) {
+ unlock_user(target_pfd, arg1, 0);
+ return -TARGET_EINVAL;
+ }
+
+ target_set = lock_user(VERIFY_READ, arg4,
+ sizeof(target_sigset_t), 1);
+ if (!target_set) {
+ unlock_user(target_pfd, arg1, 0);
+ return -TARGET_EFAULT;
+ }
+ target_to_host_sigset(set, target_set);
+ } else {
+ set = NULL;
+ }
+
+ ret = get_errno(safe_ppoll(pfd, nfds, timeout_ts,
+ set, SIGSET_T_SIZE));
+
+ if (!is_error(ret) && arg3) {
+ if (time64) {
+ if (host_to_target_timespec64(arg3, timeout_ts)) {
+ return -TARGET_EFAULT;
+ }
+ } else {
+ if (host_to_target_timespec(arg3, timeout_ts)) {
+ return -TARGET_EFAULT;
+ }
+ }
+ }
+ if (arg4) {
+ unlock_user(target_set, arg4, 0);
+ }
+ } else {
+ struct timespec ts, *pts;
+
+ if (arg3 >= 0) {
+ /* Convert ms to secs, ns */
+ ts.tv_sec = arg3 / 1000;
+ ts.tv_nsec = (arg3 % 1000) * 1000000LL;
+ pts = &ts;
+ } else {
+ /* -ve poll() timeout means "infinite" */
+ pts = NULL;
+ }
+ ret = get_errno(safe_ppoll(pfd, nfds, pts, NULL, 0));
+ }
+
+ if (!is_error(ret)) {
+ for (i = 0; i < nfds; i++) {
+ target_pfd[i].revents = tswap16(pfd[i].revents);
+ }
+ }
+ unlock_user(target_pfd, arg1, sizeof(struct target_pollfd) * nfds);
+ return ret;
+}
+#endif
+
static abi_long do_pipe2(int host_pipe[], int flags)
{
#ifdef CONFIG_PIPE2
@@ -9256,106 +9488,11 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
#endif
#ifdef TARGET_NR_pselect6
case TARGET_NR_pselect6:
- {
- abi_long rfd_addr, wfd_addr, efd_addr, n, ts_addr;
- fd_set rfds, wfds, efds;
- fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
- struct timespec ts, *ts_ptr;
-
- /*
- * The 6th arg is actually two args smashed together,
- * so we cannot use the C library.
- */
- sigset_t set;
- struct {
- sigset_t *set;
- size_t size;
- } sig, *sig_ptr;
-
- abi_ulong arg_sigset, arg_sigsize, *arg7;
- target_sigset_t *target_sigset;
-
- n = arg1;
- rfd_addr = arg2;
- wfd_addr = arg3;
- efd_addr = arg4;
- ts_addr = arg5;
-
- ret = copy_from_user_fdset_ptr(&rfds, &rfds_ptr, rfd_addr, n);
- if (ret) {
- return ret;
- }
- ret = copy_from_user_fdset_ptr(&wfds, &wfds_ptr, wfd_addr, n);
- if (ret) {
- return ret;
- }
- ret = copy_from_user_fdset_ptr(&efds, &efds_ptr, efd_addr, n);
- if (ret) {
- return ret;
- }
-
- /*
- * This takes a timespec, and not a timeval, so we cannot
- * use the do_select() helper ...
- */
- if (ts_addr) {
- if (target_to_host_timespec(&ts, ts_addr)) {
- return -TARGET_EFAULT;
- }
- ts_ptr = &ts;
- } else {
- ts_ptr = NULL;
- }
-
- /* Extract the two packed args for the sigset */
- if (arg6) {
- sig_ptr = &sig;
- sig.size = SIGSET_T_SIZE;
-
- arg7 = lock_user(VERIFY_READ, arg6, sizeof(*arg7) * 2, 1);
- if (!arg7) {
- return -TARGET_EFAULT;
- }
- arg_sigset = tswapal(arg7[0]);
- arg_sigsize = tswapal(arg7[1]);
- unlock_user(arg7, arg6, 0);
-
- if (arg_sigset) {
- sig.set = &set;
- if (arg_sigsize != sizeof(*target_sigset)) {
- /* Like the kernel, we enforce correct size sigsets */
- return -TARGET_EINVAL;
- }
- target_sigset = lock_user(VERIFY_READ, arg_sigset,
- sizeof(*target_sigset), 1);
- if (!target_sigset) {
- return -TARGET_EFAULT;
- }
- target_to_host_sigset(&set, target_sigset);
- unlock_user(target_sigset, arg_sigset, 0);
- } else {
- sig.set = NULL;
- }
- } else {
- sig_ptr = NULL;
- }
-
- ret = get_errno(safe_pselect6(n, rfds_ptr, wfds_ptr, efds_ptr,
- ts_ptr, sig_ptr));
-
- if (!is_error(ret)) {
- if (rfd_addr && copy_to_user_fdset(rfd_addr, &rfds, n))
- return -TARGET_EFAULT;
- if (wfd_addr && copy_to_user_fdset(wfd_addr, &wfds, n))
- return -TARGET_EFAULT;
- if (efd_addr && copy_to_user_fdset(efd_addr, &efds, n))
- return -TARGET_EFAULT;
-
- if (ts_addr && host_to_target_timespec(ts_addr, &ts))
- return -TARGET_EFAULT;
- }
- }
- return ret;
+ return do_pselect6(arg1, arg2, arg3, arg4, arg5, arg6, false);
+#endif
+#ifdef TARGET_NR_pselect6_time64
+ case TARGET_NR_pselect6_time64:
+ return do_pselect6(arg1, arg2, arg3, arg4, arg5, arg6, true);
#endif
#ifdef TARGET_NR_symlink
case TARGET_NR_symlink:
@@ -10306,114 +10443,17 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
case TARGET_NR__newselect:
return do_select(arg1, arg2, arg3, arg4, arg5);
#endif
-#if defined(TARGET_NR_poll) || defined(TARGET_NR_ppoll)
-# ifdef TARGET_NR_poll
+#ifdef TARGET_NR_poll
case TARGET_NR_poll:
-# endif
-# ifdef TARGET_NR_ppoll
+ return do_ppoll(arg1, arg2, arg3, arg4, arg5, false, false);
+#endif
+#ifdef TARGET_NR_ppoll
case TARGET_NR_ppoll:
-# endif
- {
- struct target_pollfd *target_pfd;
- unsigned int nfds = arg2;
- struct pollfd *pfd;
- unsigned int i;
-
- pfd = NULL;
- target_pfd = NULL;
- if (nfds) {
- if (nfds > (INT_MAX / sizeof(struct target_pollfd))) {
- return -TARGET_EINVAL;
- }
-
- target_pfd = lock_user(VERIFY_WRITE, arg1,
- sizeof(struct target_pollfd) * nfds, 1);
- if (!target_pfd) {
- return -TARGET_EFAULT;
- }
-
- pfd = alloca(sizeof(struct pollfd) * nfds);
- for (i = 0; i < nfds; i++) {
- pfd[i].fd = tswap32(target_pfd[i].fd);
- pfd[i].events = tswap16(target_pfd[i].events);
- }
- }
-
- switch (num) {
-# ifdef TARGET_NR_ppoll
- case TARGET_NR_ppoll:
- {
- struct timespec _timeout_ts, *timeout_ts = &_timeout_ts;
- target_sigset_t *target_set;
- sigset_t _set, *set = &_set;
-
- if (arg3) {
- if (target_to_host_timespec(timeout_ts, arg3)) {
- unlock_user(target_pfd, arg1, 0);
- return -TARGET_EFAULT;
- }
- } else {
- timeout_ts = NULL;
- }
-
- if (arg4) {
- if (arg5 != sizeof(target_sigset_t)) {
- unlock_user(target_pfd, arg1, 0);
- return -TARGET_EINVAL;
- }
-
- target_set = lock_user(VERIFY_READ, arg4,
sizeof(target_sigset_t), 1);
- if (!target_set) {
- unlock_user(target_pfd, arg1, 0);
- return -TARGET_EFAULT;
- }
- target_to_host_sigset(set, target_set);
- } else {
- set = NULL;
- }
-
- ret = get_errno(safe_ppoll(pfd, nfds, timeout_ts,
- set, SIGSET_T_SIZE));
-
- if (!is_error(ret) && arg3) {
- host_to_target_timespec(arg3, timeout_ts);
- }
- if (arg4) {
- unlock_user(target_set, arg4, 0);
- }
- break;
- }
-# endif
-# ifdef TARGET_NR_poll
- case TARGET_NR_poll:
- {
- struct timespec ts, *pts;
-
- if (arg3 >= 0) {
- /* Convert ms to secs, ns */
- ts.tv_sec = arg3 / 1000;
- ts.tv_nsec = (arg3 % 1000) * 1000000LL;
- pts = &ts;
- } else {
- /* -ve poll() timeout means "infinite" */
- pts = NULL;
- }
- ret = get_errno(safe_ppoll(pfd, nfds, pts, NULL, 0));
- break;
- }
-# endif
- default:
- g_assert_not_reached();
- }
-
- if (!is_error(ret)) {
- for(i = 0; i < nfds; i++) {
- target_pfd[i].revents = tswap16(pfd[i].revents);
- }
- }
- unlock_user(target_pfd, arg1, sizeof(struct target_pollfd) * nfds);
- }
- return ret;
+ return do_ppoll(arg1, arg2, arg3, arg4, arg5, true, false);
+#endif
+#ifdef TARGET_NR_ppoll_time64
+ case TARGET_NR_ppoll_time64:
+ return do_ppoll(arg1, arg2, arg3, arg4, arg5, true, true);
#endif
case TARGET_NR_flock:
/* NOTE: the flock constant seems to be the same for every
--
2.26.2
- [PULL 0/5] Linux user for 5.2 patches, Laurent Vivier, 2020/09/07
- [PULL 3/5] linux-user: Map signal numbers in fcntl, Laurent Vivier, 2020/09/07
- [PULL 1/5] linux-user: Add support for ppoll_time64() and pselect6_time64(),
Laurent Vivier <=
- [PULL 4/5] linux-user: fix ppc/termbits.h, Laurent Vivier, 2020/09/07
- [PULL 5/5] linux-user: Protect btrfs ioctl target definitions, Laurent Vivier, 2020/09/07
- [PULL 2/5] linux-user: Correctly start brk after executable, Laurent Vivier, 2020/09/07
- Re: [PULL 0/5] Linux user for 5.2 patches, Peter Maydell, 2020/09/07