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Gdb script: improve portability of ASLR disabling disabling

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Call `set disable-randomization off` only if it seems to be supported.
The goal is to neither get an error about disable-randomization not
being supported (e.g. on FreeBSD), nor get an error if it is supported
but fails (e.g. on Ubuntu).

Only fiddle with disable-randomization from all.sh, which cares
because it reports the failure of ASLR disabling as an error. If a
developer invokes the Gdb script manually, a warning about ASLR
doesn't matter.
This commit is contained in:
Gilles Peskine 2019-01-06 19:52:22 +00:00
parent 1927565f9b
commit 74851d8dd9
2 changed files with 11 additions and 3 deletions
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12
tests/scripts/all.sh
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@ -1102,17 +1102,27 @@ component_test_zeroize () {
# system in all cases that the script fails, so we must manually search the
# output to check whether the pass string is present and no failure strings
# were printed.
# Don't try to disable ASLR. We don't care about ASLR here. We do care
# about a spurious message if Gdb tries and fails, so suppress that.
gdb_disable_aslr=
if [ -z "$(gdb -batch -nw -ex 'set disable-randomization off' 2>&1)" ]; then
gdb_disable_aslr='set disable-randomization off'
fi
for optimization_flag in -O2 -O3 -Ofast -Os; do
for compiler in clang gcc; do
msg "test: $compiler $optimization_flag, mbedtls_platform_zeroize()"
make programs CC="$compiler" DEBUG=1 CFLAGS="$optimization_flag"
if_build_succeeded gdb -x tests/scripts/test_zeroize.gdb -nw -batch -nx 2>&1 | tee test_zeroize.log
if_build_succeeded gdb -ex "$gdb_disable_aslr" -x tests/scripts/test_zeroize.gdb -nw -batch -nx 2>&1 | tee test_zeroize.log
if_build_succeeded grep "The buffer was correctly zeroized" test_zeroize.log
if_build_succeeded not grep -i "error" test_zeroize.log
rm -f test_zeroize.log
make clean
done
done
unset gdb_disable_aslr
}
component_check_python_files () {

2
tests/scripts/test_zeroize.gdb
View file

@ -41,8 +41,6 @@
# number does not need to be updated often.
set confirm off
# We don't need to turn off ASLR, so don't try.
set disable-randomization off
file ./programs/test/zeroize
break zeroize.c:100