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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Kprobe event parser error log check
   4 # requires: kprobe_events error_log
   5
   6 check_error() { # command-with-error-pos-by-^
   7     ftrace_errlog_check 'trace_kprobe' "$1" 'kprobe_events'
   8 }
   9
  10 if grep -q 'r\[maxactive\]' README; then
  11 check_error 'p^100 vfs_read'            # MAXACT_NO_KPROBE
  12 check_error 'r^1a111 vfs_read'          # BAD_MAXACT
  13 check_error 'r^100000 vfs_read'         # MAXACT_TOO_BIG
  14 fi
  15
  16 check_error 'p ^non_exist_func'         # BAD_PROBE_ADDR (enoent)
  17 check_error 'p ^hoge-fuga'              # BAD_PROBE_ADDR (bad syntax)
  18 check_error 'p ^hoge+1000-1000'         # BAD_PROBE_ADDR (bad syntax)
  19 check_error 'r ^vfs_read+10'            # BAD_RETPROBE
  20 check_error 'p:^/bar vfs_read'          # NO_GROUP_NAME
  21 check_error 'p:^12345678901234567890123456789012345678901234567890123456789012345/bar vfs_read' # GROUP_TOO_LONG
  22
  23 check_error 'p:^foo.1/bar vfs_read'     # BAD_GROUP_NAME
  24 check_error 'p:foo/^ vfs_read'          # NO_EVENT_NAME
  25 check_error 'p:foo/^12345678901234567890123456789012345678901234567890123456789012345 vfs_read' # EVENT_TOO_LONG
  26 check_error 'p:foo/^bar.1 vfs_read'     # BAD_EVENT_NAME
  27
  28 check_error 'p vfs_read ^$retval'       # RETVAL_ON_PROBE
  29 check_error 'p vfs_read ^$stack10000'   # BAD_STACK_NUM
  30
  31 if grep -q '$arg<N>' README; then
  32 check_error 'p vfs_read ^$arg10000'     # BAD_ARG_NUM
  33 fi
  34
  35 check_error 'p vfs_read ^$none_var'     # BAD_VAR
  36
  37 check_error 'p vfs_read ^%none_reg'     # BAD_REG_NAME
  38 check_error 'p vfs_read ^@12345678abcde'        # BAD_MEM_ADDR
  39 check_error 'p vfs_read ^@+10'          # FILE_ON_KPROBE
  40
  41 grep -q "imm-value" README && \
  42 check_error 'p vfs_read arg1=\^x'       # BAD_IMM
  43 grep -q "imm-string" README && \
  44 check_error 'p vfs_read arg1=\"abcd^'   # IMMSTR_NO_CLOSE
  45
  46 check_error 'p vfs_read ^+0@0)'         # DEREF_NEED_BRACE
  47 check_error 'p vfs_read ^+0ab1(@0)'     # BAD_DEREF_OFFS
  48 check_error 'p vfs_read +0(+0(@0^)'     # DEREF_OPEN_BRACE
  49
  50 if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
  51 check_error 'p vfs_read +0(^$comm)'     # COMM_CANT_DEREF
  52 fi
  53
  54 check_error 'p vfs_read ^&1'            # BAD_FETCH_ARG
  55
  56
  57 # We've introduced this limitation with array support
  58 if grep -q ' <type>\\\[<array-size>\\\]' README; then
  59 check_error 'p vfs_read +0(^+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(@0))))))))))))))'    # TOO_MANY_OPS?
  60 check_error 'p vfs_read +0(@11):u8[10^'         # ARRAY_NO_CLOSE
  61 check_error 'p vfs_read +0(@11):u8[10]^a'       # BAD_ARRAY_SUFFIX
  62 check_error 'p vfs_read +0(@11):u8[^10a]'       # BAD_ARRAY_NUM
  63 check_error 'p vfs_read +0(@11):u8[^256]'       # ARRAY_TOO_BIG
  64 fi
  65
  66 check_error 'p vfs_read @11:^unknown_type'      # BAD_TYPE
  67 check_error 'p vfs_read $stack0:^string'        # BAD_STRING
  68 check_error 'p vfs_read @11:^b10@a/16'          # BAD_BITFIELD
  69
  70 check_error 'p vfs_read ^arg123456789012345678901234567890=@11' # ARG_NAME_TOO_LOG
  71 check_error 'p vfs_read ^=@11'                  # NO_ARG_NAME
  72 check_error 'p vfs_read ^var.1=@11'             # BAD_ARG_NAME
  73 check_error 'p vfs_read var1=@11 ^var1=@12'     # USED_ARG_NAME
  74 check_error 'p vfs_read ^+1234567(+1234567(+1234567(+1234567(+1234567(+1234567(@1234))))))'     # ARG_TOO_LONG
  75 check_error 'p vfs_read arg1=^'                 # NO_ARG_BODY
  76
  77 # instruction boundary check is valid on x86 (at this moment)
  78 case $(uname -m) in
  79   x86_64|i[3456]86)
  80     echo 'p vfs_read' > kprobe_events
  81     if grep -q FTRACE ../kprobes/list ; then
  82         check_error 'p ^vfs_read+3'             # BAD_INSN_BNDRY (only if function-tracer is enabled)
  83     fi
  84     ;;
  85 esac
  86
  87 # multiprobe errors
  88 if grep -q "Create/append/" README && grep -q "imm-value" README; then
  89 echo "p:kprobes/testevent $FUNCTION_FORK" > kprobe_events
  90 check_error '^r:kprobes/testevent do_exit'      # DIFF_PROBE_TYPE
  91
  92 # Explicitly use printf "%s" to not interpret \1
  93 printf "%s" "p:kprobes/testevent $FUNCTION_FORK abcd=\\1" > kprobe_events
  94 check_error "p:kprobes/testevent $FUNCTION_FORK ^bcd=\\1"       # DIFF_ARG_TYPE
  95 check_error "p:kprobes/testevent $FUNCTION_FORK ^abcd=\\1:u8"   # DIFF_ARG_TYPE
  96 check_error "p:kprobes/testevent $FUNCTION_FORK ^abcd=\\\"foo\"" # DIFF_ARG_TYPE
  97 check_error "^p:kprobes/testevent $FUNCTION_FORK abcd=\\1"      # SAME_PROBE
  98 fi
  99
 100 # %return suffix errors
 101 if grep -q "place (kretprobe): .*%return.*" README; then
 102 check_error 'p vfs_read^%hoge'          # BAD_ADDR_SUFFIX
 103 check_error 'p ^vfs_read+10%return'     # BAD_RETPROBE
 104 fi
 105
 106 exit 0