Now that Clang's -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
option is no longer required, remove it from the command line. Clang 16
and later will warn when it is used, which will cause Kconfig to think
it can't use -ftrivial-auto-var-init=zero at all. Check for whether it
is required and only use it when so.
Cc: Nathan Chancellor <nathan(a)kernel.org>
Cc: Masahiro Yamada <masahiroy(a)kernel.org>
Cc: Nick Desaulniers <ndesaulniers(a)google.com>
Cc: linux-kbuild(a)vger.kernel.org
Cc: llvm(a)lists.linux.dev
Cc: stable(a)vger.kernel.org
Fixes: f02003c860d9 ("hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO")
Signed-off-by: Kees Cook <keescook(a)chromium.org>
---
Makefile | 4 ++--
security/Kconfig.hardening | 14 ++++++++++----
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/Makefile b/Makefile
index c7705f749601..02c857e2243c 100644
--- a/Makefile
+++ b/Makefile
@@ -831,8 +831,8 @@ endif
# Initialize all stack variables with a zero value.
ifdef CONFIG_INIT_STACK_ALL_ZERO
KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
-ifdef CONFIG_CC_IS_CLANG
-# https://bugs.llvm.org/show_bug.cgi?id=45497
+ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
+# https://github.com/llvm/llvm-project/issues/44842
KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
endif
endif
diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index bd2aabb2c60f..995bc42003e6 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -22,11 +22,17 @@ menu "Memory initialization"
config CC_HAS_AUTO_VAR_INIT_PATTERN
def_bool $(cc-option,-ftrivial-auto-var-init=pattern)
-config CC_HAS_AUTO_VAR_INIT_ZERO
- # GCC ignores the -enable flag, so we can test for the feature with
- # a single invocation using the flag, but drop it as appropriate in
- # the Makefile, depending on the presence of Clang.
+config CC_HAS_AUTO_VAR_INIT_ZERO_BARE
+ def_bool $(cc-option,-ftrivial-auto-var-init=zero)
+
+config CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
+ # Clang 16 and later warn about using the -enable flag, but it
+ # is required before then.
def_bool $(cc-option,-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang)
+ depends on !CC_HAS_AUTO_VAR_INIT_ZERO_BARE
+
+config CC_HAS_AUTO_VAR_INIT_ZERO
+ def_bool CC_HAS_AUTO_VAR_INIT_ZERO_BARE || CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
choice
prompt "Initialize kernel stack variables at function entry"
--
2.34.1
Hello,
This patch is required to be patched in linux-5.4.y and linux-4.19.y.
In addition to that, the following two patches are somewhat related:
3334a45 mm/page_alloc: use ac->high_zoneidx for classzone_idx
9282012 page_alloc: fix invalid watermark check on a negative value
thanks.
We enable -Wcast-function-type globally in the kernel to warn about
mismatching types in function pointer casts. Compilers currently
warn only about ABI incompability with this flag, but Clang 16 will
enable a stricter version of the check by default that checks for an
exact type match. This will be very noisy in the kernel, so disable
-Wcast-function-type-strict without W=1 until the new warnings have
been addressed.
Cc: stable(a)vger.kernel.org
Link: https://reviews.llvm.org/D134831
Link: https://github.com/ClangBuiltLinux/linux/issues/1724
Suggested-by: Nathan Chancellor <nathan(a)kernel.org>
Signed-off-by: Sami Tolvanen <samitolvanen(a)google.com>
---
scripts/Makefile.extrawarn | 1 +
1 file changed, 1 insertion(+)
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 6ae482158bc4..52bd7df84fd6 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -64,6 +64,7 @@ KBUILD_CFLAGS += -Wno-sign-compare
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
+KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict)
endif
endif
base-commit: 7bc6e90d7aa4170039abe80b9f4e8c8e4eb35091
--
2.38.0.rc1.362.ged0d419d3c-goog
From: Quentin Schulz <quentin.schulz(a)theobroma-systems.com>
Before the split of gpio and pinctrl sections in their own driver,
rockchip_set_mux was called in pinmux_ops.gpio_set_direction for
configuring a pin in its GPIO function.
This is essential for cases where pinctrl is "bypassed" by gpio
consumers otherwise the GPIO function is not configured for the pin and
it does not work. Such was the case for the sysfs/libgpiod userspace
GPIO handling.
Let's call pinctrl_gpio_direction_input/output when setting the
direction of a GPIO so that the pinctrl core requests from the rockchip
pinctrl driver to put the pin in its GPIO function.
Fixes: 9ce9a02039de ("pinctrl/rockchip: drop the gpio related codes")
Fixes: 936ee2675eee ("gpio/rockchip: add driver for rockchip gpio")
Cc: stable(a)vger.kernel.org
Reviewed-by: Heiko Stuebner <heiko(a)sntech.de>
Signed-off-by: Quentin Schulz <quentin.schulz(a)theobroma-systems.com>
---
v2:
- added Reviewed-by,
- added missing linux/pinctrl/consumer.h header,
drivers/gpio/gpio-rockchip.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index bb50335239ac8..9c976ad7208ef 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -19,6 +19,7 @@
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/regmap.h>
@@ -156,6 +157,12 @@ static int rockchip_gpio_set_direction(struct gpio_chip *chip,
unsigned long flags;
u32 data = input ? 0 : 1;
+
+ if (input)
+ pinctrl_gpio_direction_input(bank->pin_base + offset);
+ else
+ pinctrl_gpio_direction_output(bank->pin_base + offset);
+
raw_spin_lock_irqsave(&bank->slock, flags);
rockchip_gpio_writel_bit(bank, offset, data, bank->gpio_regs->port_ddr);
raw_spin_unlock_irqrestore(&bank->slock, flags);
--
2.37.3
From: Quentin Schulz <quentin.schulz(a)theobroma-systems.com>
Before the split of gpio and pinctrl sections in their own driver,
rockchip_set_mux was called in pinmux_ops.gpio_set_direction for
configuring a pin in its GPIO function.
This is essential for cases where pinctrl is "bypassed" by gpio
consumers otherwise the GPIO function is not configured for the pin and
it does not work. Such was the case for the sysfs/libgpiod userspace
GPIO handling.
Let's re-implement the pinmux_ops.gpio_set_direction callback so that
the gpio subsystem can request from the pinctrl driver to put the pin in
its GPIO function.
Fixes: 9ce9a02039de ("pinctrl/rockchip: drop the gpio related codes")
Cc: stable(a)vger.kernel.org
Reviewed-by: Heiko Stuebner <heiko(a)sntech.de>
Signed-off-by: Quentin Schulz <quentin.schulz(a)theobroma-systems.com>
---
v2:
- added Reviewed-by,
drivers/pinctrl/pinctrl-rockchip.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 32e41395fc768..c84bd0e1ce5a6 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -2393,11 +2393,24 @@ static int rockchip_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
return 0;
}
+static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset,
+ bool input)
+{
+ struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+ struct rockchip_pin_bank *bank;
+
+ bank = pin_to_bank(info, offset);
+ return rockchip_set_mux(bank, offset - bank->pin_base, RK_FUNC_GPIO);
+}
+
static const struct pinmux_ops rockchip_pmx_ops = {
.get_functions_count = rockchip_pmx_get_funcs_count,
.get_function_name = rockchip_pmx_get_func_name,
.get_function_groups = rockchip_pmx_get_groups,
.set_mux = rockchip_pmx_set,
+ .gpio_set_direction = rockchip_pmx_gpio_set_direction,
};
/*
--
2.37.3