linux-toradex.git/scripts/kconfig/tests/warn_num_bounds/Kconfig, branch master Linux kernel for Apalis and Colibri modules kconfig: prevent out-of-bounds user input for numeric options 2026-09-17T23:31:00+00:00 Julian Braha julianbraha@gmail.com 2026-09-15T21:15:07+00:00 54f11924e4854177b357af499ebc447dc8c3c590 Currently, user input of out-of-bounds values for 'int' and 'hex' options is possible, leading to later silent failures in Kconfig if that value is used in a comparison, or a warning by GCC or error by Clang if used in the C code. Let's factor out the out-of-bounds check on constants, so that it can be reused for checking user input. The frontend will now reject an attempted user input of an out-of-bounds numeric value, similarly to how a value outside the active 'range' already does. For migration of existing configurations, a .config file with an out-of-bounds numeric value will be allowed for now, but will warn the user when read in by confdata.c Assisted-by: LLM Signed-off-by: Julian Braha <julianbraha@gmail.com> Reviewed-by: Nicolas Schier <n.schier@fritz.com> Link: https://patch.msgid.link/20260915211508.291790-5-julianbraha@gmail.com Signed-off-by: Nathan Chancellor <nathan@kernel.org> 
Currently, user input of out-of-bounds values for 'int' and 'hex' options
is possible, leading to later silent failures in Kconfig if that value is
used in a comparison, or a warning by GCC or error by Clang if used in the
C code.

Let's factor out the out-of-bounds check on constants, so that it can be
reused for checking user input.

The frontend will now reject an attempted user input of an out-of-bounds
numeric value, similarly to how a value outside the active 'range' already
does.

For migration of existing configurations, a .config file with an
out-of-bounds numeric value will be allowed for now, but will warn the
user when read in by confdata.c

Assisted-by: LLM
Signed-off-by: Julian Braha <julianbraha@gmail.com>
Reviewed-by: Nicolas Schier <n.schier@fritz.com>
Link: https://patch.msgid.link/20260915211508.291790-5-julianbraha@gmail.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>