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selftests/ftrace: Add fprobe related testcases

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Add syntax error testcase and add-remove testcase for fprobe events.
This ensures that the fprobe events can be added/removed and parser
handles syntax errors correctly.

Link: https://lore.kernel.org/all/168507470812.913472.7489900116963294042.stgit@mhiramat.roam.corp.google.com/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google)
2023-06-06 21:39:55 +09:00
parent 334e5519c3
commit 4d42a7656d
2 changed files with 123 additions and 0 deletions
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26
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Generic dynamic event - add/remove fprobe events
# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]": README
echo 0 > events/enable
echo > dynamic_events
PLACE=$FUNCTION_FORK
echo "f:myevent1 $PLACE" >> dynamic_events
echo "f:myevent2 $PLACE%return" >> dynamic_events
grep -q myevent1 dynamic_events
grep -q myevent2 dynamic_events
test -d events/fprobes/myevent1
test -d events/fprobes/myevent2
echo "-:myevent2" >> dynamic_events
grep -q myevent1 dynamic_events
! grep -q myevent2 dynamic_events
echo > dynamic_events
clear_trace

97
tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Fprobe event parser error log check
# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]": README
check_error() { # command-with-error-pos-by-^
ftrace_errlog_check 'trace_fprobe' "$1" 'dynamic_events'
}
case `uname -m` in
x86_64|i[3456]86)
REG=%ax ;;
aarch64)
REG=%x0 ;;
*)
REG=%r0 ;;
esac
check_error 'f^100 vfs_read' # MAXACT_NO_KPROBE
check_error 'f^1a111 vfs_read' # BAD_MAXACT
check_error 'f^100000 vfs_read' # MAXACT_TOO_BIG
check_error 'f ^non_exist_func' # BAD_PROBE_ADDR (enoent)
check_error 'f ^vfs_read+10' # BAD_PROBE_ADDR
check_error 'f:^/bar vfs_read' # NO_GROUP_NAME
check_error 'f:^12345678901234567890123456789012345678901234567890123456789012345/bar vfs_read' # GROUP_TOO_LONG
check_error 'f:^foo.1/bar vfs_read' # BAD_GROUP_NAME
check_error 'f:^ vfs_read' # NO_EVENT_NAME
check_error 'f:foo/^12345678901234567890123456789012345678901234567890123456789012345 vfs_read' # EVENT_TOO_LONG
check_error 'f:foo/^bar.1 vfs_read' # BAD_EVENT_NAME
check_error 'f vfs_read ^$retval' # RETVAL_ON_PROBE
check_error 'f vfs_read ^$stack10000' # BAD_STACK_NUM
check_error 'f vfs_read ^$arg10000' # BAD_ARG_NUM
check_error 'f vfs_read ^$none_var' # BAD_VAR
check_error 'f vfs_read ^'$REG # BAD_VAR
check_error 'f vfs_read ^@12345678abcde' # BAD_MEM_ADDR
check_error 'f vfs_read ^@+10' # FILE_ON_KPROBE
grep -q "imm-value" README && \
check_error 'f vfs_read arg1=\^x' # BAD_IMM
grep -q "imm-string" README && \
check_error 'f vfs_read arg1=\"abcd^' # IMMSTR_NO_CLOSE
check_error 'f vfs_read ^+0@0)' # DEREF_NEED_BRACE
check_error 'f vfs_read ^+0ab1(@0)' # BAD_DEREF_OFFS
check_error 'f vfs_read +0(+0(@0^)' # DEREF_OPEN_BRACE
if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
check_error 'f vfs_read +0(^$comm)' # COMM_CANT_DEREF
fi
check_error 'f vfs_read ^&1' # BAD_FETCH_ARG
# We've introduced this limitation with array support
if grep -q ' <type>\\\[<array-size>\\\]' README; then
check_error 'f vfs_read +0(^+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(@0))))))))))))))' # TOO_MANY_OPS?
check_error 'f vfs_read +0(@11):u8[10^' # ARRAY_NO_CLOSE
check_error 'f vfs_read +0(@11):u8[10]^a' # BAD_ARRAY_SUFFIX
check_error 'f vfs_read +0(@11):u8[^10a]' # BAD_ARRAY_NUM
check_error 'f vfs_read +0(@11):u8[^256]' # ARRAY_TOO_BIG
fi
check_error 'f vfs_read @11:^unknown_type' # BAD_TYPE
check_error 'f vfs_read $stack0:^string' # BAD_STRING
check_error 'f vfs_read @11:^b10@a/16' # BAD_BITFIELD
check_error 'f vfs_read ^arg123456789012345678901234567890=@11' # ARG_NAME_TOO_LOG
check_error 'f vfs_read ^=@11' # NO_ARG_NAME
check_error 'f vfs_read ^var.1=@11' # BAD_ARG_NAME
check_error 'f vfs_read var1=@11 ^var1=@12' # USED_ARG_NAME
check_error 'f vfs_read ^+1234567(+1234567(+1234567(+1234567(+1234567(+1234567(@1234))))))' # ARG_TOO_LONG
check_error 'f vfs_read arg1=^' # NO_ARG_BODY
# multiprobe errors
if grep -q "Create/append/" README && grep -q "imm-value" README; then
echo "f:fprobes/testevent $FUNCTION_FORK" > dynamic_events
check_error '^f:fprobes/testevent do_exit%return' # DIFF_PROBE_TYPE
# Explicitly use printf "%s" to not interpret \1
printf "%s" "f:fprobes/testevent $FUNCTION_FORK abcd=\\1" > dynamic_events
check_error "f:fprobes/testevent $FUNCTION_FORK ^bcd=\\1" # DIFF_ARG_TYPE
check_error "f:fprobes/testevent $FUNCTION_FORK ^abcd=\\1:u8" # DIFF_ARG_TYPE
check_error "f:fprobes/testevent $FUNCTION_FORK ^abcd=\\\"foo\"" # DIFF_ARG_TYPE
check_error "^f:fprobes/testevent $FUNCTION_FORK abcd=\\1" # SAME_PROBE
fi
# %return suffix errors
check_error 'f vfs_read^%hoge' # BAD_ADDR_SUFFIX
exit 0