64 lines
1.6 KiB
Plaintext
64 lines
1.6 KiB
Plaintext
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Checking dynamic events limitations
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# requires: dynamic_events "imm-value":README
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# Max arguments limitation
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MAX_ARGS=128
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EXCEED_ARGS=$((MAX_ARGS + 1))
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# bash and dash evaluate variables differently.
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# dash will evaluate '\\' every time it is read whereas bash does not.
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#
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# TEST_STRING="$TEST_STRING \\$i"
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# echo $TEST_STRING
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#
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# With i=123
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# On bash, that will print "\123"
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# but on dash, that will print the escape sequence of \123 as the \ will
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# be interpreted again in the echo.
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#
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# Set a variable "bs" to save a double backslash, then echo that
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# to "ts" to see if $ts changed or not. If it changed, it's dash,
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# if not, it's bash, and then bs can equal a single backslash.
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bs='\\'
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ts=`echo $bs`
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if [ "$ts" = '\\' ]; then
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# this is bash
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bs='\'
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fi
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check_max_args() { # event_header
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TEST_STRING=$1
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# Acceptable
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for i in `seq 1 $MAX_ARGS`; do
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TEST_STRING="$TEST_STRING $bs$i"
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done
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echo "$TEST_STRING" >> dynamic_events
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echo > dynamic_events
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# Error
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TEST_STRING="$TEST_STRING \\$EXCEED_ARGS"
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! echo "$TEST_STRING" >> dynamic_events
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return 0
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}
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# Kprobe max args limitation
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if grep -q "kprobe_events" README; then
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check_max_args "p vfs_read"
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fi
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# Fprobe max args limitation
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if grep -q "f[:[<group>/][<event>]] <func-name>[%return] [<args>]" README; then
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check_max_args "f vfs_read"
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fi
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# Tprobe max args limitation
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if grep -q "t[:[<group>/][<event>]] <tracepoint> [<args>]" README; then
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check_max_args "t kfree"
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fi
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# Uprobe max args limitation
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if grep -q "uprobe_events" README; then
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check_max_args "p /bin/sh:10"
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fi
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