#include #include #include extern struct kmem_cache *fanotify_event_cachep; extern struct kmem_cache *fanotify_perm_event_cachep; /* * Structure for normal fanotify events. It gets allocated in * fanotify_handle_event() and freed when the information is retrieved by * userspace */ struct fanotify_event_info { struct fsnotify_event fse; /* * We hold ref to this path so it may be dereferenced at any point * during this object's lifetime */ struct path path; struct pid *tgid; }; #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS /* * Structure for permission fanotify events. It gets allocated and freed in * fanotify_handle_event() since we wait there for user response. When the * information is retrieved by userspace the structure is moved from * group->notification_list to group->fanotify_data.access_list to wait for * user response. */ struct fanotify_perm_event_info { struct fanotify_event_info fae; int response; /* userspace answer to question */ int fd; /* fd we passed to userspace for this event */ }; static inline struct fanotify_perm_event_info * FANOTIFY_PE(struct fsnotify_event *fse) { return container_of(fse, struct fanotify_perm_event_info, fae.fse); } #endif static inline struct fanotify_event_info *FANOTIFY_E(struct fsnotify_event *fse) { return container_of(fse, struct fanotify_event_info, fse); } struct fanotify_event_info *fanotify_alloc_event(struct inode *inode, u32 mask, const struct path *path); summaryrefslogtreecommitdiff
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authorAndrei Vagin <avagin@openvz.org>2017-01-04 19:28:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:56 +1300
commitadd7c65ca426b7a37184dd3d2172394e23d585d6 (patch)
tree28b08b519540041b06ed0ab0b1c005076b932e8e /include/dt-bindings/power
parent75422726b0f717d67db3283c2eb5bc14fa2619c5 (diff)
pid: fix lockdep deadlock warning due to ucount_lock
========================================================= [ INFO: possible irq lock inversion dependency detected ] 4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W --------------------------------------------------------- swapper/1/0 just changed the state of lock: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0 but this lock took another, HARDIRQ-unsafe lock in the past: (ucounts_lock){+.+...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ucounts_lock); local_irq_disable(); lock(&(&sighand->siglock)->rlock); lock(&(&tty->ctrl_lock)->rlock); <Interrupt> lock(&(&sighand->siglock)->rlock); *** DEADLOCK *** This patch removes a dependency between rlock and ucount_lock. Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces") Cc: stable@vger.kernel.org Signed-off-by: Andrei Vagin <avagin@openvz.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'include/dt-bindings/power')