cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kprobe_args_syntax.tc (2275B)

      1#!/bin/sh
      2# SPDX-License-Identifier: GPL-2.0
      3# description: Kprobe event argument syntax
      4# requires: kprobe_events "x8/16/32/64":README
      5
      6PROBEFUNC="vfs_read"
      7GOODREG=
      8BADREG=
      9GOODSYM="_sdata"
     10if ! grep -qw ${GOODSYM} /proc/kallsyms ; then
     11  GOODSYM=$PROBEFUNC
     12fi
     13BADSYM="deaqswdefr"
     14SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "`
     15GOODTYPE="x16"
     16BADTYPE="y16"
     17
     18case `uname -m` in
     19x86_64|i[3456]86)
     20  GOODREG=%ax
     21  BADREG=%ex
     22;;
     23aarch64)
     24  GOODREG=%x0
     25  BADREG=%ax
     26;;
     27arm*)
     28  GOODREG=%r0
     29  BADREG=%ax
     30;;
     31ppc*)
     32  GOODREG=%r3
     33  BADREG=%msr
     34;;
     35s390*)
     36  GOODREG=%r2
     37  BADREG=%s2
     38;;
     39mips*)
     40  GOODREG=%r4
     41  BADREG=%r12
     42;;
     43*)
     44  echo "Please implement other architecture here"
     45  exit_untested
     46esac
     47
     48test_goodarg() # Good-args
     49{
     50  while [ "$1" ]; do
     51    echo "p ${PROBEFUNC} $1" > kprobe_events
     52    shift 1
     53  done;
     54}
     55
     56test_badarg() # Bad-args
     57{
     58  while [ "$1" ]; do
     59    ! echo "p ${PROBEFUNC} $1" > kprobe_events
     60    shift 1
     61  done;
     62}
     63
     64echo > kprobe_events
     65
     66: "Register access"
     67test_goodarg ${GOODREG}
     68test_badarg ${BADREG}
     69
     70: "Symbol access"
     71test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10"
     72test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \
     73	    "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10"
     74
     75: "Stack access"
     76test_goodarg "\$stack" "\$stack0" "\$stack1"
     77test_badarg "\$stackp" "\$stack0+10" "\$stack1-10"
     78
     79: "Retval access"
     80echo "r ${PROBEFUNC} \$retval" > kprobe_events
     81! echo "p ${PROBEFUNC} \$retval" > kprobe_events
     82
     83# $comm was introduced in 4.8, older kernels reject it.
     84if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
     85: "Comm access"
     86test_goodarg "\$comm"
     87fi
     88
     89: "Indirect memory access"
     90test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \
     91	"+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))"
     92test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \
     93	"+10(\$comm)" "+0(${GOODREG})+10"
     94
     95: "Name assignment"
     96test_goodarg "varname=${GOODREG}"
     97test_badarg "varname=varname2=${GOODREG}"
     98
     99: "Type syntax"
    100test_goodarg "${GOODREG}:${GOODTYPE}"
    101test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \
    102	"${GOODTYPE}:${GOODREG}"
    103
    104: "Combination check"
    105
    106test_goodarg "\$comm:string" "+0(\$stack):string"
    107test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string"