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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Kprobe event argument syntax
   4
   5 [ -f kprobe_events ] || exit_unsupported # this is configurable
   6
   7 grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue
   8
   9 echo 0 > events/enable
  10 echo > kprobe_events
  11
  12 PROBEFUNC="vfs_read"
  13 GOODREG=
  14 BADREG=
  15 GOODSYM="_sdata"
  16 if ! grep -qw ${GOODSYM} /proc/kallsyms ; then
  17   GOODSYM=$PROBEFUNC
  18 fi
  19 BADSYM="deaqswdefr"
  20 SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "`
  21 GOODTYPE="x16"
  22 BADTYPE="y16"
  23
  24 case `uname -m` in
  25 x86_64|i[3456]86)
  26   GOODREG=%ax
  27   BADREG=%ex
  28 ;;
  29 aarch64)
  30   GOODREG=%x0
  31   BADREG=%ax
  32 ;;
  33 arm*)
  34   GOODREG=%r0
  35   BADREG=%ax
  36 ;;
  37 esac
  38
  39 test_goodarg() # Good-args
  40 {
  41   while [ "$1" ]; do
  42     echo "p ${PROBEFUNC} $1" > kprobe_events
  43     shift 1
  44   done;
  45 }
  46
  47 test_badarg() # Bad-args
  48 {
  49   while [ "$1" ]; do
  50     ! echo "p ${PROBEFUNC} $1" > kprobe_events
  51     shift 1
  52   done;
  53 }
  54
  55 echo > kprobe_events
  56
  57 : "Register access"
  58 test_goodarg ${GOODREG}
  59 test_badarg ${BADREG}
  60
  61 : "Symbol access"
  62 test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10"
  63 test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \
  64             "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10"
  65
  66 : "Stack access"
  67 test_goodarg "\$stack" "\$stack0" "\$stack1"
  68 test_badarg "\$stackp" "\$stack0+10" "\$stack1-10"
  69
  70 : "Retval access"
  71 echo "r ${PROBEFUNC} \$retval" > kprobe_events
  72 ! echo "p ${PROBEFUNC} \$retval" > kprobe_events
  73
  74 # $comm was introduced in 4.8, older kernels reject it.
  75 if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
  76 : "Comm access"
  77 test_goodarg "\$comm"
  78 fi
  79
  80 : "Indirect memory access"
  81 test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \
  82         "+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))"
  83 test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \
  84         "+10(\$comm)" "+0(${GOODREG})+10"
  85
  86 : "Name assignment"
  87 test_goodarg "varname=${GOODREG}"
  88 test_badarg "varname=varname2=${GOODREG}"
  89
  90 : "Type syntax"
  91 test_goodarg "${GOODREG}:${GOODTYPE}"
  92 test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \
  93         "${GOODTYPE}:${GOODREG}"
  94
  95 : "Combination check"
  96
  97 test_goodarg "\$comm:string" "+0(\$stack):string"
  98 test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string"
  99
 100 echo > kprobe_events