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