#!/bin/sh # SPDX-License-Identifier: GPL-2.0-only
set -e
# Argument 1: Source file to build.
IN="$1"
shift # Extract just the filename for error messages below.
FILE="${IN##*/}" # Extract the function name for error messages below.
FUNC="${FILE#*-}"
FUNC="${FUNC%%-*}"
FUNC="${FUNC%%.*}" # Extract the symbol to test for in build/symbol test below.
WANT="__${FILE%%-*}"
# Argument 2: Where to write the build log.
OUT="$1"
shift
TMP="${OUT}.tmp"
# Argument 3: Path to "nm" tool.
NM="$1"
shift
# Remaining arguments are: $(CC) $(c_flags)
# Clean up temporary file at exit.
__cleanup() { rm -f "$TMP"
}
trap __cleanup EXIT
# Function names in warnings are wrapped in backticks under UTF-8 locales. # Run the commands with LANG=C so that grep output will not change. export LANG=C
status= # Attempt to build a source that is expected to fail with a specific warning. if"$@" -Werror -c "$IN" -o "$OUT".o 2> "$TMP" ; then # If the build succeeds, either the test has failed or the # warning may only happen at link time (Clang). In that case, # make sure the expected symbol is unresolved in the symbol list. # If so, FORTIFY is working for this case. if ! $NM -A "$OUT".o | grep -m1 "\bU ${WANT}$" >>"$TMP" ; then
status="warning: unsafe ${FUNC}() usage lacked '$WANT' symbol in $IN" fi else # If the build failed, check for the warning in the stderr. # GCC: # ./include/linux/fortify-string.h:316:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] # Clang 14: # ./include/linux/fortify-string.h:316:4: error: call to __write_overflow_field declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror,-Wattribute-warning] if ! grep -Eq -m1 "error: call to .?\b${WANT}\b.?""$TMP" ; then
status="warning: unsafe ${FUNC}() usage lacked '$WANT' warning in $IN" fi fi
if [ -n "$status" ]; then # Report on failure results, including compilation warnings. echo"$status" | tee "$OUT" >&2 else # Report on good results, and save any compilation output to log. echo"ok: unsafe ${FUNC}() usage correctly detected with '$WANT' in $IN" >"$OUT" fi cat"$TMP" >>"$OUT"
Messung V0.5
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