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Chris Phlipot c9f23d2bc2 perf event-parse: Use fixed size string for comms
Some implementations of libc do not support the 'm' width modifier as
part of the scanf string format specifier. This can cause the parsing to
fail.  Since the parser never checks if the scanf parsing was
successesful, this can result in a crash.

Change the comm string to be allocated as a fixed size instead of
dynamically using 'm' scanf width modifier. This can be safely done
since comm size is limited to 16 bytes by TASK_COMM_LEN within the
kernel.

This change prevents perf from crashing when linked against bionic as
well as reduces the total number of heap allocations and frees invoked
while accomplishing the same task.

Signed-off-by: Chris Phlipot <cphlipot0@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180830021950.15563-1-cphlipot0@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-08-30 14:51:45 -03:00
arch perf/core improvements ad fixes: 2018-08-18 13:11:51 +02:00
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fs perf/core improvements ad fixes: 2018-08-18 13:11:51 +02:00
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kernel perf/hw_breakpoint: Simplify breakpoint enable in perf_event_modify_breakpoint 2018-08-30 14:49:24 -03:00
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tools perf event-parse: Use fixed size string for comms 2018-08-30 14:51:45 -03:00
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Linux kernel
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There are several guides for kernel developers and users. These guides can
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See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
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