6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tony Ambardar <tony.ambardar@xxxxxxxxx>
[ Upstream commit 03bfcda1fbc37ef34aa21d2b9e09138335afc6ee ]
Current code parses arguments with strtok_r() using a construct like
char *state = NULL;
while ((next = strtok_r(state ? NULL : input, ",", &state))) {
...
}
where logic assumes the 'state' var can distinguish between first and
subsequent strtok_r() calls, and adjusts parameters accordingly. However,
'state' is strictly internal context for strtok_r() and no such assumptions
are supported in the man page. Moreover, the exact behaviour of 'state'
depends on the libc implementation, making the above code fragile.
Indeed, invoking "./test_progs -t <test_name>" on mips64el/musl will hang,
with the above code in an infinite loop.
Similarly, we see strange behaviour running 'veristat' on mips64el/musl:
$ ./veristat -e file,prog,verdict,insns -C two-ok add-failure
Can't specify more than 9 stats
Rewrite code using a counter to distinguish between strtok_r() calls.
Fixes: 61ddff373ffa ("selftests/bpf: Improve by-name subtest selection logic in prog_tests")
Fixes: 394169b079b5 ("selftests/bpf: add comparison mode to veristat")
Fixes: c8bc5e050976 ("selftests/bpf: Add veristat tool for mass-verifying BPF object files")
Signed-off-by: Tony Ambardar <tony.ambardar@xxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/392d8bf5559f85fa37926c1494e62312ef252c3d.1722244708.git.tony.ambardar@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/testing/selftests/bpf/testing_helpers.c | 4 ++--
tools/testing/selftests/bpf/veristat.c | 8 ++++----
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c
index 8d994884c7b44..6acffe0426f01 100644
--- a/tools/testing/selftests/bpf/testing_helpers.c
+++ b/tools/testing/selftests/bpf/testing_helpers.c
@@ -220,13 +220,13 @@ int parse_test_list(const char *s,
bool is_glob_pattern)
{
char *input, *state = NULL, *test_spec;
- int err = 0;
+ int err = 0, cnt = 0;
input = strdup(s);
if (!input)
return -ENOMEM;
- while ((test_spec = strtok_r(state ? NULL : input, ",", &state))) {
+ while ((test_spec = strtok_r(cnt++ ? NULL : input, ",", &state))) {
err = insert_test(set, test_spec, is_glob_pattern);
if (err)
break;
diff --git a/tools/testing/selftests/bpf/veristat.c b/tools/testing/selftests/bpf/veristat.c
index 0ad98b6a8e6ef..611b5a0a6f7e3 100644
--- a/tools/testing/selftests/bpf/veristat.c
+++ b/tools/testing/selftests/bpf/veristat.c
@@ -753,13 +753,13 @@ static int parse_stat(const char *stat_name, struct stat_specs *specs)
static int parse_stats(const char *stats_str, struct stat_specs *specs)
{
char *input, *state = NULL, *next;
- int err;
+ int err, cnt = 0;
input = strdup(stats_str);
if (!input)
return -ENOMEM;
- while ((next = strtok_r(state ? NULL : input, ",", &state))) {
+ while ((next = strtok_r(cnt++ ? NULL : input, ",", &state))) {
err = parse_stat(next, specs);
if (err)
return err;
@@ -1444,7 +1444,7 @@ static int parse_stats_csv(const char *filename, struct stat_specs *specs,
while (fgets(line, sizeof(line), f)) {
char *input = line, *state = NULL, *next;
struct verif_stats *st = NULL;
- int col = 0;
+ int col = 0, cnt = 0;
if (!header) {
void *tmp;
@@ -1462,7 +1462,7 @@ static int parse_stats_csv(const char *filename, struct stat_specs *specs,
*stat_cntp += 1;
}
- while ((next = strtok_r(state ? NULL : input, ",\n", &state))) {
+ while ((next = strtok_r(cnt++ ? NULL : input, ",\n", &state))) {
if (header) {
/* for the first line, set up spec stats */
err = parse_stat(next, specs);
--
2.43.0
