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# This awk script expects to get command-line files that are each
# the output of 'readelf -l' on a single shared object.
# But the first file should contain just "execstack-no" or "execstack-yes",
# indicating what the default is in the absence of PT_GNU_STACK.
# It exits successfully (0) if none indicated executable stack.
# It fails (1) if any did indicate executable stack.
# It fails (2) if the input did not take the expected form.
BEGIN { result = sanity = 0; default_exec = -1 }
/^execstack-no$/ { default_exec = 0; next }
/^execstack-yes$/ { default_exec = 1; next }
function check_one(name) {
if (default_exec == -1) {
print "*** missing execstack-default file?";
result = 2;
}
if (!sanity) {
print name ": *** input did not look like readelf -l output";
result = 2;
} else if (stack_line) {
if (stack_line ~ /^.*RW .*$/) {
print name ": OK";
} else if (stack_line ~ /^.*E.*$/) {
print name ": *** executable stack signaled";
result = result ? result : 1;
}
} else if (default_exec) {
print name ": *** no PT_GNU_STACK entry";
result = result ? result : 1;
} else {
print name ": no PT_GNU_STACK but default is OK";
}
sanity = 0;
}
FILENAME != lastfile {
if (lastfile)
check_one(lastfile);
lastfile = FILENAME;
}
$1 == "Type" && $7 == "Flg" { sanity = 1; stack_line = "" }
$1 == "GNU_STACK" { stack_line = $0 }
END {
check_one(lastfile);
exit(result);
}
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