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Commit 871bef20 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Steven Rostedt (VMware)
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selftests: ftrace: Add probe event argument syntax testcase 

Add a testcase for probe event argument syntax which
ensures the kprobe_events interface correctly parses
given event arguments.

Link: http://lkml.kernel.org/r/152129033679.31874.12705519603869152799.stgit@devbox



Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent c5d343b6

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc

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+97 −0
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#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Kprobe event argument syntax



[ -f kprobe_events ] || exit_unsupported # this is configurable



grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue



echo 0 > events/enable

echo > kprobe_events



PROBEFUNC="vfs_read"

GOODREG=

BADREG=

GOODSYM="_sdata"

if ! grep -qw ${GOODSYM} /proc/kallsyms ; then

  GOODSYM=$PROBEFUNC

fi

BADSYM="deaqswdefr"

SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "`

GOODTYPE="x16"

BADTYPE="y16"



case `uname -m` in

x86_64|i[3456]86)

  GOODREG=%ax

  BADREG=%ex

;;

aarch64)

  GOODREG=%x0

  BADREG=%ax

;;

arm*)

  GOODREG=%r0

  BADREG=%ax

;;

esac



test_goodarg() # Good-args

{

  while [ "$1" ]; do

    echo "p ${PROBEFUNC} $1" > kprobe_events

    shift 1

  done;

}



test_badarg() # Bad-args

{

  while [ "$1" ]; do

    ! echo "p ${PROBEFUNC} $1" > kprobe_events

    shift 1

  done;

}



echo > kprobe_events



: "Register access"

test_goodarg ${GOODREG}

test_badarg ${BADREG}



: "Symbol access"

test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10"

test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \

	    "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10"



: "Stack access"

test_goodarg "\$stack" "\$stack0" "\$stack1"

test_badarg "\$stackp" "\$stack0+10" "\$stack1-10"



: "Retval access"

echo "r ${PROBEFUNC} \$retval" > kprobe_events

! echo "p ${PROBEFUNC} \$retval" > kprobe_events



: "Comm access"

test_goodarg "\$comm"



: "Indirect memory access"

test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \

	"+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))"

test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \

	"+10(\$comm)" "+0(${GOODREG})+10"



: "Name assignment"

test_goodarg "varname=${GOODREG}"

test_badarg "varname=varname2=${GOODREG}"



: "Type syntax"

test_goodarg "${GOODREG}:${GOODTYPE}"

test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \

	"${GOODTYPE}:${GOODREG}"



: "Combination check"



test_goodarg "\$comm:string" "+0(\$stack):string"

test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string"



echo > kprobe_events