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authorLi Zefan <lizf@cn.fujitsu.com>2009-04-11 15:52:18 +0800
committerIngo Molnar <mingo@elte.hu>2009-04-12 11:59:27 +0200
commit8433a40eb7f2c4883ad57f9900f63e4d59240eb7 (patch)
tree7fab36945d0266ca00a9a13c2061cc2a0a2ae5dc /kernel
parent0462b5664b2bda5a18fef7efb5bb32ce36590c1a (diff)
downloadop-kernel-dev-8433a40eb7f2c4883ad57f9900f63e4d59240eb7.zip
op-kernel-dev-8433a40eb7f2c4883ad57f9900f63e4d59240eb7.tar.gz
tracing/filters: NIL-terminate user input filter
Make sure messages from user space are NIL-terminated strings, otherwise we could dump random memory while reading filter file. Try this: # echo 'parent_comm ==' > events/sched/sched_process_fork/filter # cat events/sched/sched_process_fork/filter parent_comm == � Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Tom Zanussi <tzanussi@gmail.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <49E04C32.6060508@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 64ec4d2..054bc18 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -503,6 +503,7 @@ event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
+ buf[cnt] = '\0';
pred = kzalloc(sizeof(*pred), GFP_KERNEL);
if (!pred)
@@ -569,6 +570,7 @@ subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
+ buf[cnt] = '\0';
pred = kzalloc(sizeof(*pred), GFP_KERNEL);
if (!pred)
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