4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mickaël Salaün <mic@xxxxxxxxxxx>
commit 26f204380a3c182e5adf1a798db0724d6111b597 upstream.
The fcntl's F_SETOWN command sets the process that handle SIGIO/SIGURG
for the related file descriptor. Before this change, the
file_set_fowner LSM hook was always called, ignoring the VFS logic which
may not actually change the process that handles SIGIO (e.g. TUN, TTY,
dnotify), nor update the related UID/EUID.
Moreover, because security_file_set_fowner() was called without lock
(e.g. f_owner.lock), concurrent F_SETOWN commands could result to a race
condition and inconsistent LSM states (e.g. SELinux's fown_sid) compared
to struct fown_struct's UID/EUID.
This change makes sure the LSM states are always in sync with the VFS
state by moving the security_file_set_fowner() call close to the
UID/EUID updates and using the same f_owner.lock .
Rename f_modown() to __f_setown() to simplify code.
Cc: stable@xxxxxxxxxxxxxxx
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Cc: Paul Moore <paul@xxxxxxxxxxxxxx>
Cc: Serge E. Hallyn <serge@xxxxxxxxxx>
Cc: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fcntl.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -84,8 +84,8 @@ static int setfl(int fd, struct file * f
return error;
}
-static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
- int force)
+void __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
+ int force)
{
write_lock_irq(&filp->f_owner.lock);
if (force || !filp->f_owner.pid) {
@@ -95,19 +95,13 @@ static void f_modown(struct file *filp,
if (pid) {
const struct cred *cred = current_cred();
+ security_file_set_fowner(filp);
filp->f_owner.uid = cred->uid;
filp->f_owner.euid = cred->euid;
}
}
write_unlock_irq(&filp->f_owner.lock);
}
-
-void __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
- int force)
-{
- security_file_set_fowner(filp);
- f_modown(filp, pid, type, force);
-}
EXPORT_SYMBOL(__f_setown);
int f_setown(struct file *filp, unsigned long arg, int force)
@@ -143,7 +137,7 @@ EXPORT_SYMBOL(f_setown);
void f_delown(struct file *filp)
{
- f_modown(filp, NULL, PIDTYPE_TGID, 1);
+ __f_setown(filp, NULL, PIDTYPE_TGID, 1);
}
pid_t f_getown(struct file *filp)
