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task #14420 (Remove sys_sem_signal from inside SYS_ARCH_PROTECT crit section) done for LWIP_TCPIP_CORE_LOCKING==1

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This commit is contained in:
goldsimon 2017-04-11 12:40:44 +02:00
parent 26d3466f50
commit 92997756d1
2 changed files with 37 additions and 4 deletions
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4
CHANGELOG
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@ -32,6 +32,10 @@ HISTORY
++ Bugfixes:
2017-04-11: Simon Goldschmidt
* sockets.c: task #14420 (Remove sys_sem_signal from inside SYS_ARCH_PROTECT
crit section) done for LWIP_TCPIP_CORE_LOCKING==1
2017-03-01: Simon Goldschmidt
* httpd: LWIP_HTTPD_POST_MANUAL_WND: fixed double-free when httpd_post_data_recved
is called nested from httpd_post_receive_data() (bug #50424)

37
src/api/sockets.c
View File

@ -305,6 +305,17 @@ static void lwip_socket_drop_registered_memberships(int s);
static struct lwip_sock sockets[NUM_SOCKETS];
#if LWIP_SOCKET_SELECT
#if LWIP_TCPIP_CORE_LOCKING
/* protect the select_cb_list using core lock */
#define LWIP_SOCKET_SELECT_DECL_PROTECT(lev)
#define LWIP_SOCKET_SELECT_PROTECT(lev) LOCK_TCPIP_CORE()
#define LWIP_SOCKET_SELECT_UNPROTECT(lev) UNLOCK_TCPIP_CORE()
#else /* LWIP_TCPIP_CORE_LOCKING */
/* protect the select_cb_list using SYS_LIGHTWEIGHT_PROT */
#define LWIP_SOCKET_SELECT_DECL_PROTECT(lev) SYS_ARCH_DECL_PROTECT(lev)
#define LWIP_SOCKET_SELECT_PROTECT(lev) SYS_ARCH_PROTECT(lev)
#define LWIP_SOCKET_SELECT_UNPROTECT(lev) SYS_ARCH_UNPROTECT(lev)
#endif /* LWIP_TCPIP_CORE_LOCKING */
/** The global list of tasks waiting for select */
static struct lwip_select_cb *select_cb_list;
/** This counter is increased from lwip_select when the list is changed
@ -600,10 +611,12 @@ lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
SYS_ARCH_UNPROTECT(lev);
if (newconn->callback) {
LOCK_TCPIP_CORE();
while(recvevent > 0) {
recvevent--;
newconn->callback(newconn, NETCONN_EVT_RCVPLUS, 0);
}
UNLOCK_TCPIP_CORE();
}
/* Note that POSIX only requires us to check addr is non-NULL. addrlen must
@ -877,7 +890,9 @@ lwip_recv_tcp(struct lwip_sock *sock, void *mem, size_t len, int flags)
if (err == ERR_CLSD) {
/* closed but already received data, ensure select gets the FIN, too */
if (sock->conn->callback != NULL) {
LOCK_TCPIP_CORE();
sock->conn->callback(sock->conn, NETCONN_EVT_RCVPLUS, 0);
UNLOCK_TCPIP_CORE();
}
}
goto lwip_recv_tcp_done;
@ -1778,6 +1793,7 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
fd_set used_sockets;
#endif
SYS_ARCH_DECL_PROTECT(lev);
LWIP_SOCKET_SELECT_DECL_PROTECT(lev2);
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select(%d, %p, %p, %p, tvsec=%"S32_F" tvusec=%"S32_F")\n",
maxfdp1, (void *)readset, (void *) writeset, (void *) exceptset,
@ -1832,7 +1848,7 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
#endif /* LWIP_NETCONN_SEM_PER_THREAD */
/* Protect the select_cb_list */
SYS_ARCH_PROTECT(lev);
LWIP_SOCKET_SELECT_PROTECT(lev2);
/* Put this select_cb on top of list */
select_cb.next = select_cb_list;
@ -1844,7 +1860,7 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
select_cb_ctr++;
/* Now we can safely unprotect */
SYS_ARCH_UNPROTECT(lev);
LWIP_SOCKET_SELECT_UNPROTECT(lev2);
/* Increase select_waiting for each socket we are interested in */
maxfdp2 = maxfdp1;
@ -1917,7 +1933,7 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
}
}
/* Take us off the list */
SYS_ARCH_PROTECT(lev);
LWIP_SOCKET_SELECT_PROTECT(lev2);
if (select_cb.next != NULL) {
select_cb.next->prev = select_cb.prev;
}
@ -1930,7 +1946,7 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
}
/* Increasing this counter tells event_callback that the list has changed. */
select_cb_ctr++;
SYS_ARCH_UNPROTECT(lev);
LWIP_SOCKET_SELECT_UNPROTECT(lev2);
#if LWIP_NETCONN_SEM_PER_THREAD
if (select_cb.sem_signalled && (!waited || (waitres == SYS_ARCH_TIMEOUT))) {
@ -2058,7 +2074,9 @@ event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len)
of waiting select calls + 1. This list is expected to be small. */
/* At this point, SYS_ARCH is still protected! */
#if !LWIP_TCPIP_CORE_LOCKING
again:
#endif
for (scb = select_cb_list; scb != NULL; scb = scb->next) {
/* remember the state of select_cb_list to detect changes */
last_select_cb_ctr = select_cb_ctr;
@ -2083,19 +2101,30 @@ again:
}
if (do_signal) {
scb->sem_signalled = 1;
#if LWIP_TCPIP_CORE_LOCKING
/* We are called with core lock held, so we can unlock interrupts here
(last_select_cb_ctr is protected by core lock) */
SYS_ARCH_UNPROTECT(lev);
#else
/* Don't call SYS_ARCH_UNPROTECT() before signaling the semaphore, as this might
lead to the select thread taking itself off the list, invalidating the semaphore. */
#endif
sys_sem_signal(SELECT_SEM_PTR(scb->sem));
#if LWIP_TCPIP_CORE_LOCKING
SYS_ARCH_PROTECT(lev);
#endif
}
}
/* unlock interrupts with each step */
SYS_ARCH_UNPROTECT(lev);
/* this makes sure interrupt protection time is short */
SYS_ARCH_PROTECT(lev);
#if !LWIP_TCPIP_CORE_LOCKING
if (last_select_cb_ctr != select_cb_ctr) {
/* someone has changed select_cb_list, restart at the beginning */
goto again;
}
#endif
}
SYS_ARCH_UNPROTECT(lev);
done_socket(sock);