In preparation for users of the "install a received file" logic outside
of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
net/core/scm.c to __fd_install_received() in fs/file.c, and provide a
wrapper named fd_install_received_user(), as future patches will change
the interface to __fd_install_received().
Signed-off-by: Kees Cook <[email protected]>
---
fs/file.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/file.h | 8 ++++++++
include/net/scm.h | 1 -
net/compat.c | 2 +-
net/core/scm.c | 32 +-----------------------------
5 files changed, 57 insertions(+), 33 deletions(-)
diff --git a/fs/file.c b/fs/file.c
index abb8b7081d7a..fcfddae0d252 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -11,6 +11,7 @@
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/net.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/file.h>
@@ -18,6 +19,8 @@
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
+#include <net/cls_cgroup.h>
+#include <net/netprio_cgroup.h>
unsigned int sysctl_nr_open __read_mostly = 1024*1024;
unsigned int sysctl_nr_open_min = BITS_PER_LONG;
@@ -931,6 +934,50 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
return err;
}
+/**
+ * __fd_install_received() - Install received file into file descriptor table
+ *
+ * @fd: fd to install into (if negative, a new fd will be allocated)
+ * @file: struct file that was received from another process
+ * @ufd_required: true to use @ufd for writing fd number to userspace
+ * @ufd: __user pointer to write new fd number to
+ * @o_flags: the O_* flags to apply to the new fd entry
+ *
+ * Installs a received file into the file descriptor table, with appropriate
+ * checks and count updates. Optionally writes the fd number to userspace.
+ *
+ * Returns -ve on error.
+ */
+int __fd_install_received(struct file *file, int __user *ufd, unsigned int o_flags)
+{
+ struct socket *sock;
+ int new_fd;
+ int error;
+
+ error = security_file_receive(file);
+ if (error)
+ return error;
+
+ new_fd = get_unused_fd_flags(o_flags);
+ if (new_fd < 0)
+ return new_fd;
+
+ error = put_user(new_fd, ufd);
+ if (error) {
+ put_unused_fd(new_fd);
+ return error;
+ }
+
+ /* Bump the usage count and install the file. */
+ sock = sock_from_file(file, &error);
+ if (sock) {
+ sock_update_netprioidx(&sock->sk->sk_cgrp_data);
+ sock_update_classid(&sock->sk->sk_cgrp_data);
+ }
+ fd_install(new_fd, get_file(file));
+ return 0;
+}
+
static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
{
int err = -EBADF;
diff --git a/include/linux/file.h b/include/linux/file.h
index 122f80084a3e..fe18a1a0d555 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -91,6 +91,14 @@ extern void put_unused_fd(unsigned int fd);
extern void fd_install(unsigned int fd, struct file *file);
+extern int __fd_install_received(struct file *file, int __user *ufd,
+ unsigned int o_flags);
+static inline int fd_install_received_user(struct file *file, int __user *ufd,
+ unsigned int o_flags)
+{
+ return __fd_install_received(file, ufd, o_flags);
+}
+
extern void flush_delayed_fput(void);
extern void __fput_sync(struct file *);
diff --git a/include/net/scm.h b/include/net/scm.h
index 581a94d6c613..1ce365f4c256 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -37,7 +37,6 @@ struct scm_cookie {
#endif
};
-int __scm_install_fd(struct file *file, int __user *ufd, unsigned int o_flags);
void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
diff --git a/net/compat.c b/net/compat.c
index 27d477fdcaa0..94f288e8dac5 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -298,7 +298,7 @@ void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
int err = 0, i;
for (i = 0; i < fdmax; i++) {
- err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
+ err = fd_install_received_user(scm->fp->fp[i], cmsg_data + i, o_flags);
if (err)
break;
}
diff --git a/net/core/scm.c b/net/core/scm.c
index 6151678c73ed..df190f1fdd28 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -280,36 +280,6 @@ void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_inter
}
EXPORT_SYMBOL(put_cmsg_scm_timestamping);
-int __scm_install_fd(struct file *file, int __user *ufd, unsigned int o_flags)
-{
- struct socket *sock;
- int new_fd;
- int error;
-
- error = security_file_receive(file);
- if (error)
- return error;
-
- new_fd = get_unused_fd_flags(o_flags);
- if (new_fd < 0)
- return new_fd;
-
- error = put_user(new_fd, ufd);
- if (error) {
- put_unused_fd(new_fd);
- return error;
- }
-
- /* Bump the usage count and install the file. */
- sock = sock_from_file(file, &error);
- if (sock) {
- sock_update_netprioidx(&sock->sk->sk_cgrp_data);
- sock_update_classid(&sock->sk->sk_cgrp_data);
- }
- fd_install(new_fd, get_file(file));
- return 0;
-}
-
static int scm_max_fds(struct msghdr *msg)
{
if (msg->msg_controllen <= sizeof(struct cmsghdr))
@@ -336,7 +306,7 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
}
for (i = 0; i < fdmax; i++) {
- err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
+ err = fd_install_received_user(scm->fp->fp[i], cmsg_data + i, o_flags);
if (err)
break;
}
--
2.25.1
On Mon, Jun 15, 2020 at 08:25:15PM -0700, Kees Cook wrote:
> In preparation for users of the "install a received file" logic outside
> of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
> net/core/scm.c to __fd_install_received() in fs/file.c, and provide a
> wrapper named fd_install_received_user(), as future patches will change
> the interface to __fd_install_received().
>
> Signed-off-by: Kees Cook <[email protected]>
> ---
> fs/file.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/file.h | 8 ++++++++
> include/net/scm.h | 1 -
> net/compat.c | 2 +-
> net/core/scm.c | 32 +-----------------------------
> 5 files changed, 57 insertions(+), 33 deletions(-)
>
> diff --git a/fs/file.c b/fs/file.c
> index abb8b7081d7a..fcfddae0d252 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -11,6 +11,7 @@
> #include <linux/export.h>
> #include <linux/fs.h>
> #include <linux/mm.h>
> +#include <linux/net.h>
> #include <linux/sched/signal.h>
> #include <linux/slab.h>
> #include <linux/file.h>
> @@ -18,6 +19,8 @@
> #include <linux/bitops.h>
> #include <linux/spinlock.h>
> #include <linux/rcupdate.h>
> +#include <net/cls_cgroup.h>
> +#include <net/netprio_cgroup.h>
>
> unsigned int sysctl_nr_open __read_mostly = 1024*1024;
> unsigned int sysctl_nr_open_min = BITS_PER_LONG;
> @@ -931,6 +934,50 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
> return err;
> }
>
> +/**
> + * __fd_install_received() - Install received file into file descriptor table
> + *
> + * @fd: fd to install into (if negative, a new fd will be allocated)
> + * @file: struct file that was received from another process
> + * @ufd_required: true to use @ufd for writing fd number to userspace
> + * @ufd: __user pointer to write new fd number to
> + * @o_flags: the O_* flags to apply to the new fd entry
Probably doesn't matter, but this function doesn't take the fd, or ufd_required
argument in this patch.
> + *
> + * Installs a received file into the file descriptor table, with appropriate
> + * checks and count updates. Optionally writes the fd number to userspace.
ufd does not apppear options here.
> + *
> + * Returns -ve on error.
> + */
> +int __fd_install_received(struct file *file, int __user *ufd, unsigned int o_flags)
> +{
> + struct socket *sock;
> + int new_fd;
> + int error;
> +
> + error = security_file_receive(file);
> + if (error)
> + return error;
> +
> + new_fd = get_unused_fd_flags(o_flags);
> + if (new_fd < 0)
> + return new_fd;
> +
> + error = put_user(new_fd, ufd);
> + if (error) {
> + put_unused_fd(new_fd);
> + return error;
> + }
> +
> + /* Bump the usage count and install the file. */
> + sock = sock_from_file(file, &error);
> + if (sock) {
> + sock_update_netprioidx(&sock->sk->sk_cgrp_data);
> + sock_update_classid(&sock->sk->sk_cgrp_data);
> + }
> + fd_install(new_fd, get_file(file));
> + return 0;
> +}
> +
> static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
> {
> int err = -EBADF;
> diff --git a/include/linux/file.h b/include/linux/file.h
> index 122f80084a3e..fe18a1a0d555 100644
> --- a/include/linux/file.h
> +++ b/include/linux/file.h
> @@ -91,6 +91,14 @@ extern void put_unused_fd(unsigned int fd);
>
> extern void fd_install(unsigned int fd, struct file *file);
>
> +extern int __fd_install_received(struct file *file, int __user *ufd,
> + unsigned int o_flags);
> +static inline int fd_install_received_user(struct file *file, int __user *ufd,
> + unsigned int o_flags)
> +{
> + return __fd_install_received(file, ufd, o_flags);
> +}
> +
> extern void flush_delayed_fput(void);
> extern void __fput_sync(struct file *);
>
> diff --git a/include/net/scm.h b/include/net/scm.h
> index 581a94d6c613..1ce365f4c256 100644
> --- a/include/net/scm.h
> +++ b/include/net/scm.h
> @@ -37,7 +37,6 @@ struct scm_cookie {
> #endif
> };
>
> -int __scm_install_fd(struct file *file, int __user *ufd, unsigned int o_flags);
> void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
> void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
> int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
> diff --git a/net/compat.c b/net/compat.c
> index 27d477fdcaa0..94f288e8dac5 100644
> --- a/net/compat.c
> +++ b/net/compat.c
> @@ -298,7 +298,7 @@ void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
> int err = 0, i;
>
> for (i = 0; i < fdmax; i++) {
> - err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
> + err = fd_install_received_user(scm->fp->fp[i], cmsg_data + i, o_flags);
> if (err)
> break;
> }
> diff --git a/net/core/scm.c b/net/core/scm.c
> index 6151678c73ed..df190f1fdd28 100644
> --- a/net/core/scm.c
> +++ b/net/core/scm.c
> @@ -280,36 +280,6 @@ void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_inter
> }
> EXPORT_SYMBOL(put_cmsg_scm_timestamping);
>
> -int __scm_install_fd(struct file *file, int __user *ufd, unsigned int o_flags)
> -{
> - struct socket *sock;
> - int new_fd;
> - int error;
> -
> - error = security_file_receive(file);
> - if (error)
> - return error;
> -
> - new_fd = get_unused_fd_flags(o_flags);
> - if (new_fd < 0)
> - return new_fd;
> -
> - error = put_user(new_fd, ufd);
> - if (error) {
> - put_unused_fd(new_fd);
> - return error;
> - }
> -
> - /* Bump the usage count and install the file. */
> - sock = sock_from_file(file, &error);
> - if (sock) {
> - sock_update_netprioidx(&sock->sk->sk_cgrp_data);
> - sock_update_classid(&sock->sk->sk_cgrp_data);
> - }
> - fd_install(new_fd, get_file(file));
> - return 0;
> -}
> -
> static int scm_max_fds(struct msghdr *msg)
> {
> if (msg->msg_controllen <= sizeof(struct cmsghdr))
> @@ -336,7 +306,7 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
> }
>
> for (i = 0; i < fdmax; i++) {
> - err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
> + err = fd_install_received_user(scm->fp->fp[i], cmsg_data + i, o_flags);
> if (err)
> break;
> }
> --
> 2.25.1
>
On Tue, Jun 16, 2020 at 05:29:41AM +0000, Sargun Dhillon wrote:
> On Mon, Jun 15, 2020 at 08:25:15PM -0700, Kees Cook wrote:
> > +/**
> > + * __fd_install_received() - Install received file into file descriptor table
> > + *
> > + * @fd: fd to install into (if negative, a new fd will be allocated)
> > + * @file: struct file that was received from another process
> > + * @ufd_required: true to use @ufd for writing fd number to userspace
> > + * @ufd: __user pointer to write new fd number to
> > + * @o_flags: the O_* flags to apply to the new fd entry
> Probably doesn't matter, but this function doesn't take the fd, or ufd_required
> argument in this patch.
>
> > + *
> > + * Installs a received file into the file descriptor table, with appropriate
> > + * checks and count updates. Optionally writes the fd number to userspace.
> ufd does not apppear options here.
Argh, yes, thanks. I think this was a fixup targeting the wrong commit.
I will adjust.
--
Kees Cook
From: Kees Cook
> Sent: 16 June 2020 04:25
> In preparation for users of the "install a received file" logic outside
> of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
> net/core/scm.c to __fd_install_received() in fs/file.c, and provide a
> wrapper named fd_install_received_user(), as future patches will change
> the interface to __fd_install_received().
Any reason for the leading __ ??
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
On Wed, Jun 17, 2020 at 03:25:41PM +0000, David Laight wrote:
> From: Kees Cook
> > Sent: 16 June 2020 04:25
>
> > In preparation for users of the "install a received file" logic outside
> > of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
> > net/core/scm.c to __fd_install_received() in fs/file.c, and provide a
> > wrapper named fd_install_received_user(), as future patches will change
> > the interface to __fd_install_received().
>
> Any reason for the leading __ ??
Mainly because of the code pattern of only using the inline helpers to
call it.
--
Kees Cook
On Mon, Jun 15, 2020 at 08:25:15PM -0700, Kees Cook wrote:
> In preparation for users of the "install a received file" logic outside
> of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
> net/core/scm.c to __fd_install_received() in fs/file.c, and provide a
> wrapper named fd_install_received_user(), as future patches will change
> the interface to __fd_install_received().
>
> Signed-off-by: Kees Cook <[email protected]>
> ---
> fs/file.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/file.h | 8 ++++++++
> include/net/scm.h | 1 -
> net/compat.c | 2 +-
> net/core/scm.c | 32 +-----------------------------
> 5 files changed, 57 insertions(+), 33 deletions(-)
>
> diff --git a/fs/file.c b/fs/file.c
> index abb8b7081d7a..fcfddae0d252 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -11,6 +11,7 @@
> #include <linux/export.h>
> #include <linux/fs.h>
> #include <linux/mm.h>
> +#include <linux/net.h>
> #include <linux/sched/signal.h>
> #include <linux/slab.h>
> #include <linux/file.h>
> @@ -18,6 +19,8 @@
> #include <linux/bitops.h>
> #include <linux/spinlock.h>
> #include <linux/rcupdate.h>
> +#include <net/cls_cgroup.h>
> +#include <net/netprio_cgroup.h>
>
> unsigned int sysctl_nr_open __read_mostly = 1024*1024;
> unsigned int sysctl_nr_open_min = BITS_PER_LONG;
> @@ -931,6 +934,50 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
> return err;
> }
>
> +/**
> + * __fd_install_received() - Install received file into file descriptor table
> + *
> + * @fd: fd to install into (if negative, a new fd will be allocated)
> + * @file: struct file that was received from another process
> + * @ufd_required: true to use @ufd for writing fd number to userspace
> + * @ufd: __user pointer to write new fd number to
> + * @o_flags: the O_* flags to apply to the new fd entry
> + *
> + * Installs a received file into the file descriptor table, with appropriate
> + * checks and count updates. Optionally writes the fd number to userspace.
> + *
> + * Returns -ve on error.
> + */
> +int __fd_install_received(struct file *file, int __user *ufd, unsigned int o_flags)
> +{
> + struct socket *sock;
> + int new_fd;
> + int error;
> +
> + error = security_file_receive(file);
> + if (error)
> + return error;
> +
> + new_fd = get_unused_fd_flags(o_flags);
> + if (new_fd < 0)
> + return new_fd;
> +
> + error = put_user(new_fd, ufd);
> + if (error) {
> + put_unused_fd(new_fd);
> + return error;
> + }
> +
> + /* Bump the usage count and install the file. */
> + sock = sock_from_file(file, &error);
> + if (sock) {
> + sock_update_netprioidx(&sock->sk->sk_cgrp_data);
> + sock_update_classid(&sock->sk->sk_cgrp_data);
> + }
> + fd_install(new_fd, get_file(file));
> + return 0;
> +}
> +
> static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
> {
> int err = -EBADF;
> diff --git a/include/linux/file.h b/include/linux/file.h
> index 122f80084a3e..fe18a1a0d555 100644
> --- a/include/linux/file.h
> +++ b/include/linux/file.h
> @@ -91,6 +91,14 @@ extern void put_unused_fd(unsigned int fd);
>
> extern void fd_install(unsigned int fd, struct file *file);
>
> +extern int __fd_install_received(struct file *file, int __user *ufd,
> + unsigned int o_flags);
> +static inline int fd_install_received_user(struct file *file, int __user *ufd,
> + unsigned int o_flags)
> +{
> + return __fd_install_received(file, ufd, o_flags);
> +}
Shouldn't this be the other way around such that
fd_install_received_user() is the workhorse that has a "ufd" argument
and fd_install_received() is the static inline function that doesn't?
extern int fd_install_received_user(struct file *file, int __user *ufd, unsigned int o_flags)
static inline int fd_install_received(struct file *file, unsigned int o_flags)
{
return fd_install_received_user(file, NULL, o_flags);
}
(So I'm on vacation this week some my reviews are selective and spotty
but I promise to be back next week. :))
Christian
> +
> extern void flush_delayed_fput(void);
> extern void __fput_sync(struct file *);
>
> diff --git a/include/net/scm.h b/include/net/scm.h
> index 581a94d6c613..1ce365f4c256 100644
> --- a/include/net/scm.h
> +++ b/include/net/scm.h
> @@ -37,7 +37,6 @@ struct scm_cookie {
> #endif
> };
>
> -int __scm_install_fd(struct file *file, int __user *ufd, unsigned int o_flags);
> void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
> void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
> int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
> diff --git a/net/compat.c b/net/compat.c
> index 27d477fdcaa0..94f288e8dac5 100644
> --- a/net/compat.c
> +++ b/net/compat.c
> @@ -298,7 +298,7 @@ void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
> int err = 0, i;
>
> for (i = 0; i < fdmax; i++) {
> - err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
> + err = fd_install_received_user(scm->fp->fp[i], cmsg_data + i, o_flags);
> if (err)
> break;
> }
> diff --git a/net/core/scm.c b/net/core/scm.c
> index 6151678c73ed..df190f1fdd28 100644
> --- a/net/core/scm.c
> +++ b/net/core/scm.c
> @@ -280,36 +280,6 @@ void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_inter
> }
> EXPORT_SYMBOL(put_cmsg_scm_timestamping);
>
> -int __scm_install_fd(struct file *file, int __user *ufd, unsigned int o_flags)
> -{
> - struct socket *sock;
> - int new_fd;
> - int error;
> -
> - error = security_file_receive(file);
> - if (error)
> - return error;
> -
> - new_fd = get_unused_fd_flags(o_flags);
> - if (new_fd < 0)
> - return new_fd;
> -
> - error = put_user(new_fd, ufd);
> - if (error) {
> - put_unused_fd(new_fd);
> - return error;
> - }
> -
> - /* Bump the usage count and install the file. */
> - sock = sock_from_file(file, &error);
> - if (sock) {
> - sock_update_netprioidx(&sock->sk->sk_cgrp_data);
> - sock_update_classid(&sock->sk->sk_cgrp_data);
> - }
> - fd_install(new_fd, get_file(file));
> - return 0;
> -}
> -
> static int scm_max_fds(struct msghdr *msg)
> {
> if (msg->msg_controllen <= sizeof(struct cmsghdr))
> @@ -336,7 +306,7 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
> }
>
> for (i = 0; i < fdmax; i++) {
> - err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
> + err = fd_install_received_user(scm->fp->fp[i], cmsg_data + i, o_flags);
> if (err)
> break;
> }
> --
> 2.25.1
>
On Thu, Jun 18, 2020 at 10:56:14AM +0200, Christian Brauner wrote:
> On Mon, Jun 15, 2020 at 08:25:15PM -0700, Kees Cook wrote:
> > In preparation for users of the "install a received file" logic outside
> > of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
> > net/core/scm.c to __fd_install_received() in fs/file.c, and provide a
> > wrapper named fd_install_received_user(), as future patches will change
> > the interface to __fd_install_received().
> >
> > Signed-off-by: Kees Cook <[email protected]>
> > ---
> > fs/file.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/file.h | 8 ++++++++
> > include/net/scm.h | 1 -
> > net/compat.c | 2 +-
> > net/core/scm.c | 32 +-----------------------------
> > 5 files changed, 57 insertions(+), 33 deletions(-)
> >
> > diff --git a/fs/file.c b/fs/file.c
> > index abb8b7081d7a..fcfddae0d252 100644
> > --- a/fs/file.c
> > +++ b/fs/file.c
> > @@ -11,6 +11,7 @@
> > #include <linux/export.h>
> > #include <linux/fs.h>
> > #include <linux/mm.h>
> > +#include <linux/net.h>
> > #include <linux/sched/signal.h>
> > #include <linux/slab.h>
> > #include <linux/file.h>
> > @@ -18,6 +19,8 @@
> > #include <linux/bitops.h>
> > #include <linux/spinlock.h>
> > #include <linux/rcupdate.h>
> > +#include <net/cls_cgroup.h>
> > +#include <net/netprio_cgroup.h>
> >
> > unsigned int sysctl_nr_open __read_mostly = 1024*1024;
> > unsigned int sysctl_nr_open_min = BITS_PER_LONG;
> > @@ -931,6 +934,50 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
> > return err;
> > }
> >
> > +/**
> > + * __fd_install_received() - Install received file into file descriptor table
> > + *
> > + * @fd: fd to install into (if negative, a new fd will be allocated)
> > + * @file: struct file that was received from another process
> > + * @ufd_required: true to use @ufd for writing fd number to userspace
> > + * @ufd: __user pointer to write new fd number to
> > + * @o_flags: the O_* flags to apply to the new fd entry
> > + *
> > + * Installs a received file into the file descriptor table, with appropriate
> > + * checks and count updates. Optionally writes the fd number to userspace.
> > + *
> > + * Returns -ve on error.
> > + */
> > +int __fd_install_received(struct file *file, int __user *ufd, unsigned int o_flags)
> > +{
> > + struct socket *sock;
> > + int new_fd;
> > + int error;
> > +
> > + error = security_file_receive(file);
> > + if (error)
> > + return error;
> > +
> > + new_fd = get_unused_fd_flags(o_flags);
> > + if (new_fd < 0)
> > + return new_fd;
> > +
> > + error = put_user(new_fd, ufd);
> > + if (error) {
> > + put_unused_fd(new_fd);
> > + return error;
> > + }
> > +
> > + /* Bump the usage count and install the file. */
> > + sock = sock_from_file(file, &error);
> > + if (sock) {
> > + sock_update_netprioidx(&sock->sk->sk_cgrp_data);
> > + sock_update_classid(&sock->sk->sk_cgrp_data);
> > + }
> > + fd_install(new_fd, get_file(file));
> > + return 0;
> > +}
> > +
> > static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
> > {
> > int err = -EBADF;
> > diff --git a/include/linux/file.h b/include/linux/file.h
> > index 122f80084a3e..fe18a1a0d555 100644
> > --- a/include/linux/file.h
> > +++ b/include/linux/file.h
> > @@ -91,6 +91,14 @@ extern void put_unused_fd(unsigned int fd);
> >
> > extern void fd_install(unsigned int fd, struct file *file);
> >
> > +extern int __fd_install_received(struct file *file, int __user *ufd,
> > + unsigned int o_flags);
> > +static inline int fd_install_received_user(struct file *file, int __user *ufd,
> > + unsigned int o_flags)
> > +{
> > + return __fd_install_received(file, ufd, o_flags);
> > +}
>
> Shouldn't this be the other way around such that
> fd_install_received_user() is the workhorse that has a "ufd" argument
> and fd_install_received() is the static inline function that doesn't?
>
> extern int fd_install_received_user(struct file *file, int __user *ufd, unsigned int o_flags)
> static inline int fd_install_received(struct file *file, unsigned int o_flags)
> {
> return fd_install_received_user(file, NULL, o_flags);
> }
So, I think it's all worked out in v5[1], so the helper argument handling
is better for the ufd case, as David pointed out earlier. (As in,
I think you're reacting to the same general problem here.)
> (So I'm on vacation this week some my reviews are selective and spotty
> but I promise to be back next week. :))
No worries!
-Kees
[1] https://lore.kernel.org/lkml/[email protected]/
--
Kees Cook