#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Kprobe event user-memory access
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# requires: kprobe_events '$arg<N>':README
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grep -A10 "fetcharg:" README | grep -q 'ustring' || exit_unsupported
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grep -A10 "fetcharg:" README | grep -q '\[u\]<offset>' || exit_unsupported
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:;: "user-memory access syntax and ustring working on user memory";:
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echo 'p:myevent do_sys_open path=+0($arg2):ustring path2=+u0($arg2):string' \
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> kprobe_events
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echo 'p:myevent2 do_sys_openat2 path=+0($arg2):ustring path2=+u0($arg2):string' \
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>> kprobe_events
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grep myevent kprobe_events | \
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grep -q 'path=+0($arg2):ustring path2=+u0($arg2):string'
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echo 1 > events/kprobes/myevent/enable
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echo 1 > events/kprobes/myevent2/enable
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echo > /dev/null
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echo 0 > events/kprobes/myevent/enable
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echo 0 > events/kprobes/myevent2/enable
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grep myevent trace | grep -q 'path="/dev/null" path2="/dev/null"'
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:;: "user-memory access syntax and ustring not working with kernel memory";:
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echo 'p:myevent vfs_symlink path=+0($arg3):ustring path2=+u0($arg3):string' \
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> kprobe_events
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echo 1 > events/kprobes/myevent/enable
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ln -s foo $TMPDIR/bar
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echo 0 > events/kprobes/myevent/enable
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grep myevent trace | grep -q 'path=(fault) path2=(fault)'
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exit 0
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