diff options
| author | Neal Liu <neal.liu@mediatek.com> | 2020-07-27 11:25:46 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-07-29 18:38:30 +0200 |
| commit | efe9711214e6138a5a2a46ca4068bfce50c03444 (patch) | |
| tree | 73343cbdd485268e6e4186b2c947a865895d0b00 /drivers | |
| parent | 81f94ddfeceddb3b8ffa6cfe5ddd3b896711d9ad (diff) | |
cpuidle: change enter_s2idle() prototype
Control Flow Integrity(CFI) is a security mechanism that disallows
changes to the original control flow graph of a compiled binary,
making it significantly harder to perform such attacks.
init_state_node() assign same function callback to different
function pointer declarations.
static int init_state_node(struct cpuidle_state *idle_state,
const struct of_device_id *matches,
struct device_node *state_node) { ...
idle_state->enter = match_id->data; ...
idle_state->enter_s2idle = match_id->data; }
Function declarations:
struct cpuidle_state { ...
int (*enter) (struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index);
void (*enter_s2idle) (struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index); };
In this case, either enter() or enter_s2idle() would cause CFI check
failed since they use same callee.
Align function prototype of enter() since it needs return value for
some use cases. The return value of enter_s2idle() is no
need currently.
Signed-off-by: Neal Liu <neal.liu@mediatek.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 6 | ||||
| -rw-r--r-- | drivers/cpuidle/cpuidle-tegra.c | 8 | ||||
| -rw-r--r-- | drivers/idle/intel_idle.c | 6 |
3 files changed, 13 insertions, 7 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 75534c5b5433..6ffb6c99c2de 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -655,8 +655,8 @@ static int acpi_idle_enter(struct cpuidle_device *dev, return index; } -static void acpi_idle_enter_s2idle(struct cpuidle_device *dev, - struct cpuidle_driver *drv, int index) +static int acpi_idle_enter_s2idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) { struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); @@ -674,6 +674,8 @@ static void acpi_idle_enter_s2idle(struct cpuidle_device *dev, } } acpi_idle_do_entry(cx); + + return 0; } static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c index 150045849d78..a12fb141875a 100644 --- a/drivers/cpuidle/cpuidle-tegra.c +++ b/drivers/cpuidle/cpuidle-tegra.c @@ -253,11 +253,13 @@ static int tegra_cpuidle_enter(struct cpuidle_device *dev, return err ? -1 : index; } -static void tegra114_enter_s2idle(struct cpuidle_device *dev, - struct cpuidle_driver *drv, - int index) +static int tegra114_enter_s2idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) { tegra_cpuidle_enter(dev, drv, index); + + return 0; } /* diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index fa23a7ea01ac..3f86f36dab2b 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -173,13 +173,15 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev, * Invoked as a suspend-to-idle callback routine with frozen user space, frozen * scheduler tick and suspended scheduler clock on the target CPU. */ -static __cpuidle void intel_idle_s2idle(struct cpuidle_device *dev, - struct cpuidle_driver *drv, int index) +static __cpuidle int intel_idle_s2idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) { unsigned long eax = flg2MWAIT(drv->states[index].flags); unsigned long ecx = 1; /* break on interrupt flag */ mwait_idle_with_hints(eax, ecx); + + return 0; } /* |