Messages in this thread Patch in this message | | | From | Wang ShaoBo <> | Subject | [PATCH] tracing: Fix tracing buffer length in tracing_mark_write | Date | Tue, 23 Jun 2020 16:52:18 +0800 |
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__copy_from_user_inatomic() return the byte length that copied failed, tracing buffer should left this bytes.
Fixes: 656c7f0d2d2b ("tracing: Replace kmap with copy_from_user() in trace_marker writing") Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com> --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 29615f15a820..ed5fe0f165e0 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -6628,7 +6628,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf, written = -EFAULT; } else written = cnt; - len = cnt; + cnt -= len; if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) { /* do not add \n before testing triggers, but add \0 */ -- 2.17.1
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