From: Randy Dunlap rdunlap@infradead.org
[ Upstream commit ab818c7aa7544bf8d2dd4bdf68878b17a02eb332 ]
__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: 1bd54d851f50 ("kgdboc: Passing ekgdboc to command line causes panic") Fixes: f2d937f3bf00 ("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 --- drivers/tty/serial/kgdboc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c index 0314e78e31ff..72b89702d008 100644 --- a/drivers/tty/serial/kgdboc.c +++ b/drivers/tty/serial/kgdboc.c @@ -304,16 +304,16 @@ 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);