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io.c: do not use rb_notify_fd_close close on recycled FD

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It is unsafe to release GVL and call rb_notify_fd_close after
close(2) on any given FD.  FDs (file descriptor) may be recycled
in other threads immediately after close() to point to a different
file description.  Note the distinction between "file description"
and "file descriptor".

th-1                           | th-2
-------------------------------+---------------------------------------
io_close_fptr                  |
  rb_notify_fd_close(fd)       |
  fptr_finalize_flush          |
    close(fd)                  |
  rb_thread_schedule           |
                               | fd reused (via pipe/open/socket/etc)
  rb_notify_fd_close(fd)       |
                               | sees "stream closed" exception
			       |   for DIFFERENT file description

* thread.c (rb_thread_io_blocking_region): adjust comment for list_del
* thread.c (rb_notify_fd_close): give busy list to caller
* thread.c (rb_thread_fd_close): loop on busy list
* io.c (io_close_fptr): do not call rb_thread_fd_close on invalid FD
* io.c (io_reopen): use rb_thread_fd_close

Fixes: r57422 ("io.c: close before wait")

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63216 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-04-21 03:12:36 +00:00
parent af72dcd91b
commit 645f7fbd4e
2 changed files with 23 additions and 21 deletions
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16
io.c
View file

@ -21,6 +21,7 @@
#include <ctype.h>
#include <errno.h>
#include "ruby_atomic.h"
#include "ccan/list/list.h"
#undef free
#define free(x) xfree(x)
@ -4654,15 +4655,14 @@ rb_io_memsize(const rb_io_t *fptr)
# define KEEPGVL FALSE
#endif
int rb_notify_fd_close(int fd);
int rb_notify_fd_close(int fd, struct list_head *);
static rb_io_t *
io_close_fptr(VALUE io)
{
rb_io_t *fptr;
int fd;
VALUE write_io;
rb_io_t *write_fptr;
int busy;
LIST_HEAD(busy);
write_io = GetWriteIO(io);
if (io != write_io) {
@ -4676,11 +4676,9 @@ io_close_fptr(VALUE io)
if (!fptr) return 0;
if (fptr->fd < 0) return 0;
fd = fptr->fd;
busy = rb_notify_fd_close(fd);
if (busy) {
fptr_finalize_flush(fptr, FALSE, KEEPGVL);
do rb_thread_schedule(); while (rb_notify_fd_close(fd));
if (rb_notify_fd_close(fptr->fd, &busy)) {
fptr_finalize_flush(fptr, FALSE, KEEPGVL); /* calls close(fptr->fd) */
do rb_thread_schedule(); while (!list_empty(&busy));
}
rb_io_fptr_cleanup(fptr, FALSE);
return fptr;
@ -7185,7 +7183,7 @@ io_reopen(VALUE io, VALUE nfile)
rb_update_max_fd(fd);
fptr->fd = fd;
}
rb_notify_fd_close(fd);
rb_thread_fd_close(fd);
if ((orig->mode & FMODE_READABLE) && pos >= 0) {
if (io_seek(fptr, pos, SEEK_SET) < 0 && errno) {
rb_sys_fail_path(fptr->pathv);

28
thread.c
View file

@ -1527,7 +1527,10 @@ rb_thread_io_blocking_region(rb_blocking_function_t *func, void *data1, int fd)
}
EC_POP_TAG();
/* must be deleted before jump */
/*
* must be deleted before jump
* this will delete either from waiting_fds or on-stack LIST_HEAD(busy)
*/
list_del(&wfd.wfd_node);
if (state) {
@ -2260,35 +2263,36 @@ rb_ec_reset_raised(rb_execution_context_t *ec)
}
int
rb_notify_fd_close(int fd)
rb_notify_fd_close(int fd, struct list_head *busy)
{
rb_vm_t *vm = GET_THREAD()->vm;
struct waiting_fd *wfd = 0;
int busy;
struct waiting_fd *next = 0;
busy = 0;
list_for_each(&vm->waiting_fds, wfd, wfd_node) {
list_for_each_safe(&vm->waiting_fds, wfd, next, wfd_node) {
if (wfd->fd == fd) {
rb_thread_t *th = wfd->th;
VALUE err;
busy = 1;
if (!th) {
continue;
}
wfd->th = 0;
list_del(&wfd->wfd_node);
list_add(busy, &wfd->wfd_node);
err = th->vm->special_exceptions[ruby_error_stream_closed];
rb_threadptr_pending_interrupt_enque(th, err);
rb_threadptr_interrupt(th);
}
}
return busy;
return !list_empty(busy);
}
void
rb_thread_fd_close(int fd)
{
while (rb_notify_fd_close(fd)) rb_thread_schedule();
LIST_HEAD(busy);
if (rb_notify_fd_close(fd, &busy)) {
do rb_thread_schedule(); while (!list_empty(&busy));
}
}
/*