Resguardo inicial

linux-7.2.3/lib/test_fortify/.gitignore

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/*.log

linux-7.2.3/lib/test_fortify/Makefile

@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0
+
+ccflags-y := $(call cc-disable-warning,fortify-source)
+ccflags-y += $(call cc-disable-warning,stringop-overread)
+
+quiet_cmd_test_fortify = TEST    $@
+      cmd_test_fortify = $(CONFIG_SHELL) $(src)/test_fortify.sh \
+			$< $@ "$(NM)" $(CC) $(c_flags) -DKBUILD_EXTRA_WARN1
+
+$(obj)/%.log: $(src)/%.c $(src)/test_fortify.sh FORCE
+	$(call if_changed_dep,test_fortify)
+
+logs = $(patsubst $(src)/%.c, %.log, $(wildcard $(src)/*-*.c))
+targets += $(logs)
+
+quiet_cmd_gen_fortify_log = CAT     $@
+      cmd_gen_fortify_log = cat $(or $(real-prereqs),/dev/null) > $@
+
+$(obj)/test_fortify.log: $(addprefix $(obj)/, $(logs)) FORCE
+	$(call if_changed,gen_fortify_log)
+
+always-y += test_fortify.log
+
+# Some architectures define __NO_FORTIFY if __SANITIZE_ADDRESS__ is undefined.
+# Pass CFLAGS_KASAN to avoid warnings.
+KASAN_SANITIZE := y

linux-7.2.3/lib/test_fortify/read_overflow-memchr.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memchr(small, 0x7A, sizeof(small) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow-memchr_inv.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memchr_inv(small, 0x7A, sizeof(small) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow-memcmp.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memcmp(small, large, sizeof(small) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow-memscan.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memscan(small, 0x7A, sizeof(small) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow2-memcmp.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memcmp(large, small, sizeof(small) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow2-memcpy.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memcpy(large, instance.buf, sizeof(large))
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow2-memmove.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memmove(large, instance.buf, sizeof(large))
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow2_field-memcpy.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memcpy(large, instance.buf, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/read_overflow2_field-memmove.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memmove(large, instance.buf, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/test_fortify.h

@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <linux/kernel.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+void do_fortify_tests(void);
+
+#define __BUF_SMALL	16
+#define __BUF_LARGE	32
+struct fortify_object {
+	int a;
+	char buf[__BUF_SMALL];
+	int c;
+};
+
+#define LITERAL_SMALL "AAAAAAAAAAAAAAA"
+#define LITERAL_LARGE "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+const char small_src[__BUF_SMALL] = LITERAL_SMALL;
+const char large_src[__BUF_LARGE] = LITERAL_LARGE;
+
+char small[__BUF_SMALL];
+char large[__BUF_LARGE];
+struct fortify_object instance;
+size_t size;
+
+void do_fortify_tests(void)
+{
+	/* Normal initializations. */
+	memset(&instance, 0x32, sizeof(instance));
+	memset(small, 0xA5, sizeof(small));
+	memset(large, 0x5A, sizeof(large));
+
+	TEST;
+}

linux-7.2.3/lib/test_fortify/test_fortify.sh

@@ -0,0 +1,66 @@
+#!/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%/*}/.${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 HUP INT QUIT TERM
+
+# 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"

linux-7.2.3/lib/test_fortify/write_overflow-memcpy.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memcpy(instance.buf, large_src, sizeof(large_src))
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow-memmove.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memmove(instance.buf, large_src, sizeof(large_src))
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow-memset.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memset(instance.buf, 0x5A, sizeof(large_src))
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow-strcpy-lit.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	strcpy(small, LITERAL_LARGE)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow-strcpy.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	strcpy(small, large_src)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow-strscpy.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	strscpy(instance.buf, large_src, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow_field-memcpy.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memcpy(instance.buf, large, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow_field-memmove.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memmove(instance.buf, large, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"

linux-7.2.3/lib/test_fortify/write_overflow_field-memset.c

@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define TEST	\
+	memset(instance.buf, 0x42, sizeof(instance.buf) + 1)
+
+#include "test_fortify.h"