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[SV 66037] Avoid hang/crash from MAKEFLAGS=... on command line

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Make enters an infinite loop when some option and MAKEFLAGS=<value>
are specified on the command line.  For example,
    $ make -r MAKEFLAGS=hello=world

If decode_switches() runs handle_non_switch_argument() from within
the getopt() loop, it would recursively call decode_switches() to
enter a new getopt() loop, corrupting the state of the outer loop.

* src/main.c (decode_switches): Save up non-option arguments and run
handle_non_switch_argument() only after we're done with getopt().
* tests/scripts/variables/MAKEFLAGS: Add tests.
This commit is contained in:
Dmitry Goncharov 2024-08-04 15:13:44 -04:00 committed by Paul Smith
parent 49b955a50d
commit 034f862361
2 changed files with 49 additions and 9 deletions
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35
src/main.c
View file

@ -3108,8 +3108,20 @@ decode_switches (int argc, const char **argv, enum variable_origin origin)
int bad = 0;
struct command_switch *cs;
struct stringlist *sl;
struct stringlist targets;
int c;
unsigned int found_wait = 0;
const char **a;
/* This is for safety/double-checking. */
static int using_getopt = 0;
assert (using_getopt == 0);
using_getopt = 1;
/* Get enough space for all the arguments, just in case. */
targets.max = argc + 1;
targets.list = alloca (targets.max * sizeof (const char **));
targets.idx = 0;
/* getopt does most of the parsing for us.
First, get its vectors set up. */
@ -3138,14 +3150,9 @@ decode_switches (int argc, const char **argv, enum variable_origin origin)
see all he did wrong. */
bad = 1;
else if (c == 1)
{
/* An argument not starting with a dash. */
const unsigned int prior_found_wait = found_wait;
found_wait = handle_non_switch_argument (coptarg, origin);
if (prior_found_wait && lastgoal)
/* If the argument before this was .WAIT, wait here. */
lastgoal->wait_here = 1;
}
/* An argument not starting with a dash. Defer handling until later,
since handle_non_switch_argument() might corrupt getopt(). */
targets.list[targets.idx++] = coptarg;
else
/* An option starting with a dash. */
for (cs = switches; cs->c != '\0'; ++cs)
@ -3339,9 +3346,19 @@ decode_switches (int argc, const char **argv, enum variable_origin origin)
to be returned in order, this only happens when there is a "--"
argument to prevent later arguments from being options. */
while (optind < argc)
targets.list[targets.idx++] = argv[optind++];
targets.list[targets.idx] = NULL;
/* Cannot call getopt below this line. */
using_getopt = 0;
/* handle_non_switch_argument() can only be called after getopt is done;
if one of the arguments is MAKEFLAGS=<value> then it will recurse here
and call getopt() again, corrupting the state if the outer method. */
for (a = targets.list; *a; ++a)
{
const int prior_found_wait = found_wait;
found_wait = handle_non_switch_argument (argv[optind++], origin);
found_wait = handle_non_switch_argument (*a, origin);
if (prior_found_wait && lastgoal)
lastgoal->wait_here = 1;
}

23
tests/scripts/variables/MAKEFLAGS
View file

@ -902,5 +902,28 @@ unlink('hello');
rmdir('localtmp');
# sv 66037. An infinite loop when MAKEFLAGS is specified on the command line.
my @cli= ('-r MAKEFLAGS=-k hello=world',
'-r MAKEFLAGS=-k hello=world MAKEFLAGS=-R',
'-r MAKEFLAGS="-R -- hello=world MAKEFLAGS=-k"');
for my $c (@cli) {
run_make_test(q!
$(info hello=$(hello))
all:;
!, $c, "hello=world\n#MAKE#: 'all' is up to date.\n");
}
run_make_test(q!
$(info hello=$(hello))
all:;
!, '-r MAKEFLAGS="-R -- hello=world MAKEFLAGS=hello=bye"',
"hello=bye\n#MAKE#: 'all' is up to date.\n");
run_make_test(q!
$(info hello=$(hello))
all:;
!, '-r MAKEFLAGS="-R -- hello=world MAKEFLAGS=-s"',
"hello=world\n");
# This tells the test driver that the perl test script executed properly.
1;