mbedtls/tests/scripts/test_zeroize.gdb

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# test_zeroize.gdb
#
# Copyright (c) 2018, Arm Limited, All Rights Reserved
Add Apache-2.0 headers to all scripts This commit was generated using the following script: # ======================== #!/bin/sh # Find scripts find -path './.git' -prune -o '(' -name '*.gdb' -o -name '*.pl' -o -name '*.py' -o -name '*.sh' ')' -print | xargs sed -i ' # Remove Mbed TLS declaration if it occurs before the copyright line 1,/Copyright.*Arm/I { /This file is part of/,$ { /Copyright.*Arm/I! d } } # Convert non-standard header in scripts/abi_check.py to the format used in the other scripts /"""/,/"""/ { # Cut copyright declaration /Copyright.*Arm/I { h N d } # Paste copyright declaration /"""/ { x /./ { s/^/# / # Add # x # Replace orignal buffer with Copyright declaration p # Print original buffer, insert newline i\ s/.*// # Clear original buffer } x } } /Copyright.*Arm/I { # Print copyright declaration p # Read the two lines immediately following the copyright declaration N N # Insert Apache header if it is missing /SPDX/! { i\ # SPDX-License-Identifier: Apache-2.0\ #\ # Licensed under the Apache License, Version 2.0 (the "License"); you may\ # not use this file except in compliance with the License.\ # You may obtain a copy of the License at\ #\ # http://www.apache.org/licenses/LICENSE-2.0\ #\ # Unless required by applicable law or agreed to in writing, software\ # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT\ # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\ # See the License for the specific language governing permissions and\ # limitations under the License. # Insert Mbed TLS declaration if it is missing /This file is part of/! i\ #\ # This file is part of Mbed TLS (https://tls.mbed.org) } # Clear copyright declaration from buffer D } ' # ======================== Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
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# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This file is part of Mbed TLS (https://tls.mbed.org)
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#
# Purpose
#
# Run a test using the debugger to check that the mbedtls_platform_zeroize()
# function in platform_util.h is not being optimized out by the compiler. To do
# so, the script loads the test program at programs/test/zeroize.c and sets a
# breakpoint at the last return statement in main(). When the breakpoint is
# hit, the debugger manually checks the contents to be zeroized and checks that
# it is actually cleared.
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#
# The mbedtls_platform_zeroize() test is debugger driven because there does not
# seem to be a mechanism to reliably check whether the zeroize calls are being
# eliminated by compiler optimizations from within the compiled program. The
# problem is that a compiler would typically remove what it considers to be
# "unnecessary" assignments as part of redundant code elimination. To identify
# such code, the compilar will create some form dependency graph between
# reads and writes to variables (among other situations). It will then use this
# data structure to remove redundant code that does not have an impact on the
# program's observable behavior. In the case of mbedtls_platform_zeroize(), an
# intelligent compiler could determine that this function clears a block of
# memory that is not accessed later in the program, so removing the call to
# mbedtls_platform_zeroize() does not have an observable behavior. However,
# inserting a test after a call to mbedtls_platform_zeroize() to check whether
# the block of memory was correctly zeroed would force the compiler to not
# eliminate the mbedtls_platform_zeroize() call. If this does not occur, then
# the compiler potentially has a bug.
#
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# Note: This test requires that the test program is compiled with -g3.
set confirm off
file ./programs/test/zeroize
search GDB_BREAK_HERE
break $_
set args ./programs/test/zeroize.c
run
set $i = 0
set $len = sizeof(buf)
set $buf = buf
while $i < $len
if $buf[$i++] != 0
echo The buffer at was not zeroized\n
quit 1
end
end
echo The buffer was correctly zeroized\n
continue
if $_exitcode != 0
echo The program did not terminate correctly\n
quit 1
end
quit 0