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
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| 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 ${PROBEFUNC} \$retval" > kprobe_events | |
| 73 | + | |
| 74 | +: "Comm access" | |
| 75 | +test_goodarg "\$comm" | |
| 76 | + | |
| 77 | +: "Indirect memory access" | |
| 78 | +test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \ | |
| 79 | + "+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))" | |
| 80 | +test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \ | |
| 81 | + "+10(\$comm)" "+0(${GOODREG})+10" | |
| 82 | + | |
| 83 | +: "Name assignment" | |
| 84 | +test_goodarg "varname=${GOODREG}" | |
| 85 | +test_badarg "varname=varname2=${GOODREG}" | |
| 86 | + | |
| 87 | +: "Type syntax" | |
| 88 | +test_goodarg "${GOODREG}:${GOODTYPE}" | |
| 89 | +test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \ | |
| 90 | + "${GOODTYPE}:${GOODREG}" | |
| 91 | + | |
| 92 | +: "Combination check" | |
| 93 | + | |
| 94 | +test_goodarg "\$comm:string" "+0(\$stack):string" | |
| 95 | +test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string" | |
| 96 | + | |
| 97 | +echo > kprobe_events | |