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io_uring-5.6-20200320

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Merge tag 'io_uring-5.6-20200320' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Two different fixes in here:

   - Fix for a potential NULL pointer deref for links with async or
     drain marked (Pavel)

   - Fix for not properly checking RLIMIT_NOFILE for async punted
     operations.

     This affects openat/openat2, which were added this cycle, and
     accept4. I did a full audit of other cases where we might check
     current->signal->rlim[] and found only RLIMIT_FSIZE for buffered
     writes and fallocate. That one is fixed and queued for 5.7 and
     marked stable"

* tag 'io_uring-5.6-20200320' of git://git.kernel.dk/linux-block:
  io_uring: make sure accept honor rlimit nofile
  io_uring: make sure openat/openat2 honor rlimit nofile
  io_uring: NULL-deref for IOSQE_{ASYNC,DRAIN}
This commit is contained in:
Linus Torvalds 2020-03-21 11:54:47 -07:00
commit 1ab7ea1f83
5 changed files with 30 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
fs/file.c
View File

@ -540,9 +540,14 @@ static int alloc_fd(unsigned start, unsigned flags)
return __alloc_fd(current->files, start, rlimit(RLIMIT_NOFILE), flags);
}
int __get_unused_fd_flags(unsigned flags, unsigned long nofile)
{
return __alloc_fd(current->files, 0, nofile, flags);
}
int get_unused_fd_flags(unsigned flags)
{
return __alloc_fd(current->files, 0, rlimit(RLIMIT_NOFILE), flags);
return __get_unused_fd_flags(flags, rlimit(RLIMIT_NOFILE));
}
EXPORT_SYMBOL(get_unused_fd_flags);

18
fs/io_uring.c
View File

@ -343,6 +343,7 @@ struct io_accept {
struct sockaddr __user *addr;
int __user *addr_len;
int flags;
unsigned long nofile;
};
struct io_sync {
@ -397,6 +398,7 @@ struct io_open {
struct filename *filename;
struct statx __user *buffer;
struct open_how how;
unsigned long nofile;
};
struct io_files_update {
@ -2577,6 +2579,7 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return ret;
}
req->open.nofile = rlimit(RLIMIT_NOFILE);
req->flags |= REQ_F_NEED_CLEANUP;
return 0;
}
@ -2618,6 +2621,7 @@ static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return ret;
}
req->open.nofile = rlimit(RLIMIT_NOFILE);
req->flags |= REQ_F_NEED_CLEANUP;
return 0;
}
@ -2636,7 +2640,7 @@ static int io_openat2(struct io_kiocb *req, struct io_kiocb **nxt,
if (ret)
goto err;
ret = get_unused_fd_flags(req->open.how.flags);
ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile);
if (ret < 0)
goto err;
@ -3321,6 +3325,7 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
accept->flags = READ_ONCE(sqe->accept_flags);
accept->nofile = rlimit(RLIMIT_NOFILE);
return 0;
#else
return -EOPNOTSUPP;
@ -3337,7 +3342,8 @@ static int __io_accept(struct io_kiocb *req, struct io_kiocb **nxt,
file_flags = force_nonblock ? O_NONBLOCK : 0;
ret = __sys_accept4_file(req->file, file_flags, accept->addr,
accept->addr_len, accept->flags);
accept->addr_len, accept->flags,
accept->nofile);
if (ret == -EAGAIN && force_nonblock)
return -EAGAIN;
if (ret == -ERESTARTSYS)
@ -4131,6 +4137,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
{
ssize_t ret = 0;
if (!sqe)
return 0;
if (io_op_defs[req->opcode].file_table) {
ret = io_grab_files(req);
if (unlikely(ret))
@ -4907,6 +4916,11 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
req->flags |= REQ_F_LINK;
INIT_LIST_HEAD(&req->link_list);
if (io_alloc_async_ctx(req)) {
ret = -EAGAIN;
goto err_req;
}
ret = io_req_defer_prep(req, sqe);
if (ret)
req->flags |= REQ_F_FAIL_LINK;

1
include/linux/file.h
View File

@ -85,6 +85,7 @@ extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
extern void set_close_on_exec(unsigned int fd, int flag);
extern bool get_close_on_exec(unsigned int fd);
extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile);
extern int get_unused_fd_flags(unsigned flags);
extern void put_unused_fd(unsigned int fd);

3
include/linux/socket.h
View File

@ -401,7 +401,8 @@ extern int __sys_sendto(int fd, void __user *buff, size_t len,
int addr_len);
extern int __sys_accept4_file(struct file *file, unsigned file_flags,
struct sockaddr __user *upeer_sockaddr,
int __user *upeer_addrlen, int flags);
int __user *upeer_addrlen, int flags,
unsigned long nofile);
extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
int __user *upeer_addrlen, int flags);
extern int __sys_socket(int family, int type, int protocol);

8
net/socket.c
View File

@ -1707,7 +1707,8 @@ SYSCALL_DEFINE2(listen, int, fd, int, backlog)
int __sys_accept4_file(struct file *file, unsigned file_flags,
struct sockaddr __user *upeer_sockaddr,
int __user *upeer_addrlen, int flags)
int __user *upeer_addrlen, int flags,
unsigned long nofile)
{
struct socket *sock, *newsock;
struct file *newfile;
@ -1738,7 +1739,7 @@ int __sys_accept4_file(struct file *file, unsigned file_flags,
*/
__module_get(newsock->ops->owner);
newfd = get_unused_fd_flags(flags);
newfd = __get_unused_fd_flags(flags, nofile);
if (unlikely(newfd < 0)) {
err = newfd;
sock_release(newsock);
@ -1807,7 +1808,8 @@ int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
f = fdget(fd);
if (f.file) {
ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
upeer_addrlen, flags);
upeer_addrlen, flags,
rlimit(RLIMIT_NOFILE));
if (f.flags)
fput(f.file);
}