tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_user.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Kprobe event user-memory access
   4
   5 [ -f kprobe_events ] || exit_unsupported # this is configurable
   6
   7 grep -q '\$arg<N>' README || exit_unresolved # depends on arch
   8 grep -A10 "fetcharg:" README | grep -q 'ustring' || exit_unsupported
   9 grep -A10 "fetcharg:" README | grep -q '\[u\]<offset>' || exit_unsupported
  10
  11 :;: "user-memory access syntax and ustring working on user memory";:
  12 echo 'p:myevent do_sys_open path=+0($arg2):ustring path2=+u0($arg2):string' \
  13         > kprobe_events
  14
  15 grep myevent kprobe_events | \
  16         grep -q 'path=+0($arg2):ustring path2=+u0($arg2):string'
  17 echo 1 > events/kprobes/myevent/enable
  18 echo > /dev/null
  19 echo 0 > events/kprobes/myevent/enable
  20
  21 grep myevent trace | grep -q 'path="/dev/null" path2="/dev/null"'
  22
  23 :;: "user-memory access syntax and ustring not working with kernel memory";:
  24 echo 'p:myevent vfs_symlink path=+0($arg3):ustring path2=+u0($arg3):string' \
  25         > kprobe_events
  26 echo 1 > events/kprobes/myevent/enable
  27 ln -s foo $TMPDIR/bar
  28 echo 0 > events/kprobes/myevent/enable
  29
  30 grep myevent trace | grep -q 'path=(fault) path2=(fault)'
  31
  32 exit 0