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