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bootstd: Handle a few special cases in cmdline_set_arg()

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Two bugs have appeared:

- arguments can have an equals sign embedded in them, which must be
  considered part of the value
- arguments must fully match the name; partial matches should be
  ignored

Fix these and add a test to cover both.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2023-10-25 07:17:36 +13:00 committed by Tom Rini
parent f2bfa0cb17
commit 19248dcec5
2 changed files with 23 additions and 2 deletions
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5
boot/bootflow.c
View file

@ -752,7 +752,7 @@ int cmdline_set_arg(char *buf, int maxlen, const char *cmdline,
in_quote = false;
continue;
}
if (*p == '=') {
if (*p == '=' && !arg_end) {
arg_end = p;
val = p + 1;
} else if (*p == '"') {
@ -788,7 +788,8 @@ int cmdline_set_arg(char *buf, int maxlen, const char *cmdline,
}
/* if this is the target arg, update it */
if (!strncmp(from, set_arg, arg_end - from)) {
if (arg_end - from == set_arg_len &&
!strncmp(from, set_arg, set_arg_len)) {
if (!buf) {
bool has_quote = val_end[-1] == '"';

20
test/boot/bootflow.c
View file

@ -973,6 +973,26 @@ static int bootflow_cmdline(struct unit_test_state *uts)
}
BOOTSTD_TEST(bootflow_cmdline, 0);
/* test a few special changes to a long command line */
static int bootflow_cmdline_special(struct unit_test_state *uts)
{
char buf[500];
int pos;
/*
* check handling of an argument which has an embedded '=', as well as
* handling of a argument which partially matches ("ro" and "root")
*/
ut_asserteq(32, cmdline_set_arg(
buf, sizeof(buf),
"loglevel=7 root=PARTUUID=d68352e3 rootwait ro noinitrd",
"root", NULL, &pos));
ut_asserteq_str("loglevel=7 rootwait ro noinitrd", buf);
return 0;
}
BOOTSTD_TEST(bootflow_cmdline_special, 0);
/* Test ChromiumOS bootmeth */
static int bootflow_cros(struct unit_test_state *uts)
{