From d07861cc7aa605a64c83bc7fbe1340bc31b2c2cf Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Wed, 12 Jul 2023 09:04:38 -0600 Subject: bootstd: Add a function to update a command line The Linux command line consists of a number of words with optional values. At present U-Boot allows this to be changed using the bootargs environment variable. But this is quite painful, since the command line can be very long. Add a function which can adjust a single field in the command line, so that it is easier to make changes before booting. Signed-off-by: Simon Glass Reviewed-by: Bin Meng --- test/boot/bootflow.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) (limited to 'test') diff --git a/test/boot/bootflow.c b/test/boot/bootflow.c index f7ebf9d7f27..ead71172e12 100644 --- a/test/boot/bootflow.c +++ b/test/boot/bootflow.c @@ -683,3 +683,157 @@ static int bootflow_menu_theme(struct unit_test_state *uts) return 0; } BOOTSTD_TEST(bootflow_menu_theme, UT_TESTF_DM | UT_TESTF_SCAN_FDT); + +/** + * check_arg() - Check both the normal case and the buffer-overflow case + * + * @uts: Unit-test state + * @expect_ret: Expected return value (i.e. buffer length) + * @expect_str: String expected to be returned + * @buf: Buffer to use + * @from: Original cmdline to update + * @arg: Argument to update (e.g. "console") + * @val: Value to set (e.g. "ttyS2") or NULL to delete the argument if present, + * "" to set it to an empty value (e.g. "console=") and BOOTFLOWCL_EMPTY to add + * it without any value ("initrd") + */ +static int check_arg(struct unit_test_state *uts, int expect_ret, + const char *expect_str, char *buf, const char *from, + const char *arg, const char *val) +{ + /* check for writing outside the reported bounds */ + buf[expect_ret] = '['; + ut_asserteq(expect_ret, + cmdline_set_arg(buf, expect_ret, from, arg, val, NULL)); + ut_asserteq_str(expect_str, buf); + ut_asserteq('[', buf[expect_ret]); + + /* do the test again but with one less byte in the buffer */ + ut_asserteq(-E2BIG, cmdline_set_arg(buf, expect_ret - 1, from, arg, + val, NULL)); + + return 0; +} + +/* Test of bootflow_cmdline_set_arg() */ +static int test_bootflow_cmdline_set(struct unit_test_state *uts) +{ + char buf[50]; + const int size = sizeof(buf); + + /* + * note that buffer-overflow tests are immediately each test case, just + * top keep the code together + */ + + /* add an arg that doesn't already exist, starting from empty */ + ut_asserteq(-ENOENT, cmdline_set_arg(buf, size, NULL, "me", NULL, + NULL)); + + ut_assertok(check_arg(uts, 3, "me", buf, NULL, "me", BOOTFLOWCL_EMPTY)); + ut_assertok(check_arg(uts, 4, "me=", buf, NULL, "me", "")); + ut_assertok(check_arg(uts, 8, "me=fred", buf, NULL, "me", "fred")); + + /* add an arg that doesn't already exist, starting from non-empty */ + ut_assertok(check_arg(uts, 11, "arg=123 me", buf, "arg=123", "me", + BOOTFLOWCL_EMPTY)); + ut_assertok(check_arg(uts, 12, "arg=123 me=", buf, "arg=123", "me", + "")); + ut_assertok(check_arg(uts, 16, "arg=123 me=fred", buf, "arg=123", "me", + "fred")); + + /* update an arg at the start */ + ut_assertok(check_arg(uts, 1, "", buf, "arg=123", "arg", NULL)); + ut_assertok(check_arg(uts, 4, "arg", buf, "arg=123", "arg", + BOOTFLOWCL_EMPTY)); + ut_assertok(check_arg(uts, 5, "arg=", buf, "arg=123", "arg", "")); + ut_assertok(check_arg(uts, 6, "arg=1", buf, "arg=123", "arg", "1")); + ut_assertok(check_arg(uts, 9, "arg=1234", buf, "arg=123", "arg", + "1234")); + + /* update an arg at the end */ + ut_assertok(check_arg(uts, 5, "mary", buf, "mary arg=123", "arg", + NULL)); + ut_assertok(check_arg(uts, 9, "mary arg", buf, "mary arg=123", "arg", + BOOTFLOWCL_EMPTY)); + ut_assertok(check_arg(uts, 10, "mary arg=", buf, "mary arg=123", "arg", + "")); + ut_assertok(check_arg(uts, 11, "mary arg=1", buf, "mary arg=123", "arg", + "1")); + ut_assertok(check_arg(uts, 14, "mary arg=1234", buf, "mary arg=123", + "arg", "1234")); + + /* update an arg in the middle */ + ut_assertok(check_arg(uts, 16, "mary=abc john=2", buf, + "mary=abc arg=123 john=2", "arg", NULL)); + ut_assertok(check_arg(uts, 20, "mary=abc arg john=2", buf, + "mary=abc arg=123 john=2", "arg", + BOOTFLOWCL_EMPTY)); + ut_assertok(check_arg(uts, 21, "mary=abc arg= john=2", buf, + "mary=abc arg=123 john=2", "arg", "")); + ut_assertok(check_arg(uts, 22, "mary=abc arg=1 john=2", buf, + "mary=abc arg=123 john=2", "arg", "1")); + ut_assertok(check_arg(uts, 25, "mary=abc arg=1234 john=2", buf, + "mary=abc arg=123 john=2", "arg", "1234")); + + /* handle existing args with quotes */ + ut_assertok(check_arg(uts, 16, "mary=\"abc\" john", buf, + "mary=\"abc\" arg=123 john", "arg", NULL)); + + /* handle existing args with quoted spaces */ + ut_assertok(check_arg(uts, 20, "mary=\"abc def\" john", buf, + "mary=\"abc def\" arg=123 john", "arg", NULL)); + + ut_assertok(check_arg(uts, 34, "mary=\"abc def\" arg=123 john def=4", + buf, "mary=\"abc def\" arg=123 john", "def", + "4")); + + /* quote at the start */ + ut_asserteq(-EBADF, cmdline_set_arg(buf, size, + "mary=\"abc def\" arg=\"123 456\"", + "arg", "\"4 5 6", NULL)); + + /* quote at the end */ + ut_asserteq(-EBADF, cmdline_set_arg(buf, size, + "mary=\"abc def\" arg=\"123 456\"", + "arg", "4 5 6\"", NULL)); + + /* quote in the middle */ + ut_asserteq(-EBADF, cmdline_set_arg(buf, size, + "mary=\"abc def\" arg=\"123 456\"", + "arg", "\"4 \"5 6\"", NULL)); + + /* handle updating a quoted arg */ + ut_assertok(check_arg(uts, 27, "mary=\"abc def\" arg=\"4 5 6\"", buf, + "mary=\"abc def\" arg=\"123 456\"", "arg", + "4 5 6")); + + /* changing a quoted arg to a non-quoted arg */ + ut_assertok(check_arg(uts, 23, "mary=\"abc def\" arg=789", buf, + "mary=\"abc def\" arg=\"123 456\"", "arg", + "789")); + + /* changing a non-quoted arg to a quoted arg */ + ut_assertok(check_arg(uts, 29, "mary=\"abc def\" arg=\"456 789\"", buf, + "mary=\"abc def\" arg=123", "arg", "456 789")); + + /* handling of spaces */ + ut_assertok(check_arg(uts, 8, "arg=123", buf, " ", "arg", "123")); + ut_assertok(check_arg(uts, 8, "arg=123", buf, " ", "arg", "123")); + ut_assertok(check_arg(uts, 13, "john arg=123", buf, " john ", "arg", + "123")); + ut_assertok(check_arg(uts, 13, "john arg=123", buf, " john arg=123 ", + "arg", "123")); + ut_assertok(check_arg(uts, 18, "john arg=123 mary", buf, + " john arg=123 mary ", "arg", "123")); + + /* unchanged arg */ + ut_assertok(check_arg(uts, 3, "me", buf, "me", "me", BOOTFLOWCL_EMPTY)); + + /* arg which starts with the same name */ + ut_assertok(check_arg(uts, 28, "mary=abc johnathon=2 john=3", buf, + "mary=abc johnathon=2 john=1", "john", "3")); + + return 0; +} +BOOTSTD_TEST(test_bootflow_cmdline_set, 0); -- cgit v1.2.3