When CONFIG_KASAN is enabled, we have several functions that use rather large kernel stacks, e.g.
drivers/isdn/hardware/eicon/message.c: In function 'group_optimization': drivers/isdn/hardware/eicon/message.c:14841:1: warning: the frame size of 864 bytes is larger than 500 bytes [-Wframe-larger-than=] drivers/isdn/hardware/eicon/message.c: In function 'add_b1': drivers/isdn/hardware/eicon/message.c:7925:1: warning: the frame size of 1008 bytes is larger than 500 bytes [-Wframe-larger-than=] drivers/isdn/hardware/eicon/message.c: In function 'add_b23': drivers/isdn/hardware/eicon/message.c:8551:1: warning: the frame size of 928 bytes is larger than 500 bytes [-Wframe-larger-than=] drivers/isdn/hardware/eicon/message.c: In function 'sig_ind': drivers/isdn/hardware/eicon/message.c:6113:1: warning: the frame size of 2112 bytes is larger than 500 bytes [-Wframe-larger-than=]
To be on the safe side, and to enable a lower frame size warning limit, let's just mark this driver as broken when KASAN is in use. I have tried to reduce the stack size as I did with dozens of other drivers, but failed to come up with a good solution for this one.
Signed-off-by: Arnd Bergmann arnd@arndb.de --- drivers/isdn/hardware/eicon/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/isdn/hardware/eicon/Kconfig b/drivers/isdn/hardware/eicon/Kconfig index 6082b6a5ced3..b64496062421 100644 --- a/drivers/isdn/hardware/eicon/Kconfig +++ b/drivers/isdn/hardware/eicon/Kconfig @@ -31,6 +31,7 @@ config ISDN_DIVAS_PRIPCI
config ISDN_DIVAS_DIVACAPI tristate "DIVA CAPI2.0 interface support" + depends on !KASAN || BROKEN help You need this to provide the CAPI interface for DIVA Server cards.