[PATCH 0/7][RESEND] tracing: Fix bugs in string filters.

[Li Zefan]

This patchset fixes some bugs in string filters. Those bugs
affect both ftrace and perf-trace.

A new string helper strnstr() is introduced, to be used in
middle matching callback.

Also I add some comments to mainly explain why we should use
length-limited version of strstr() and strcmp().

---
 include/linux/string.h             |    5 ++++-
 kernel/trace/ftrace.c              |    6 +++---
 kernel/trace/trace_events_filter.c |   29 ++++++++++++++++++++---------
 lib/string.c                       |   27 ++++++++++++++++++++++++++-
 4 files changed, 53 insertions(+), 14 deletions(-)


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