diff options
| author |   Oleg Nesterov <oleg@redhat.com> | 2014-06-27 19:01:40 +0200 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2014-06-30 13:22:15 -0400 |
| commit | 06d0713904e508f765e0d7146c14b67bbd248fe7 (patch) | |
| tree | 568f93a984be6f8b1524e4883130aee38fe6692e /kernel/events | |
| parent | tracing/uprobes: Revert "Support mix of ftrace and perf" (diff) | |
| download | linux-dev-06d0713904e508f765e0d7146c14b67bbd248fe7.tar.xz linux-dev-06d0713904e508f765e0d7146c14b67bbd248fe7.zip | |
uprobes: Change unregister/apply to WARN() if uprobe/consumer is gone
Add WARN_ON's into uprobe_unregister() and uprobe_apply() to ensure
that nobody tries to play with the dead uprobe/consumer. This helps
to catch the bugs like the one fixed by the previous patch.
In the longer term we should fix this poorly designed interface.
uprobe_register() should return "struct uprobe *" which should be
passed to apply/unregister. Plus other semantic changes, see the
changelog in commit 41ccba029e94.
Link: http://lkml.kernel.org/p/20140627170140.GA18322@redhat.com
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/uprobes.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index c445e392e93f..6f3254e8c137 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -846,7 +846,7 @@ static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *u { int err; - if (!consumer_del(uprobe, uc)) /* WARN? */ + if (WARN_ON(!consumer_del(uprobe, uc))) return; err = register_for_each_vma(uprobe, NULL); @@ -927,7 +927,7 @@ int uprobe_apply(struct inode *inode, loff_t offset, int ret = -ENOENT; uprobe = find_uprobe(inode, offset); - if (!uprobe) + if (WARN_ON(!uprobe)) return ret; down_write(&uprobe->register_rwsem); @@ -952,7 +952,7 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume struct uprobe *uprobe; uprobe = find_uprobe(inode, offset); - if (!uprobe) + if (WARN_ON(!uprobe)) return; down_write(&uprobe->register_rwsem); |