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kgdboc: fix return value of __setup handler

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[ Upstream commit ab818c7aa7 ]

__setup() handlers should return 1 to obsolete_checksetup() in
init/main.c to indicate that the boot option has been handled.
A return of 0 causes the boot option/value to be listed as an Unknown
kernel parameter and added to init's (limited) environment strings.
So return 1 from kgdboc_option_setup().

Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc7
  kgdboc=kbd kgdbts=", will be passed to user space.

 Run /sbin/init as init process
   with arguments:
     /sbin/init
   with environment:
     HOME=/
     TERM=linux
     BOOT_IMAGE=/boot/bzImage-517rc7
     kgdboc=kbd
     kgdbts=

Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Fixes: 1bd54d851f ("kgdboc: Passing ekgdboc to command line causes panic")
Fixes: f2d937f3bf ("consoles: polling support, kgdboc")
Cc: He Zhe <zhe.he@windriver.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: kgdb-bugreport@lists.sourceforge.net
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: linux-serial@vger.kernel.org
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20220309033018.17936-1-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Randy Dunlap 2022-03-08 19:30:18 -08:00 committed by Greg Kroah-Hartman
parent 679993cbb4
commit d65c2d7606
1 changed files with 3 additions and 3 deletions
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6
drivers/tty/serial/kgdboc.c
View file

@ -403,16 +403,16 @@ static int kgdboc_option_setup(char *opt)
{
if (!opt) {
pr_err("config string not provided\n");
return -EINVAL;
return 1;
}
if (strlen(opt) >= MAX_CONFIG_LEN) {
pr_err("config string too long\n");
return -ENOSPC;
return 1;
}
strcpy(config, opt);
return 0;
return 1;
}
__setup("kgdboc=", kgdboc_option_setup);