mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-11-23 21:13:16 +00:00
eed4296890
* Furi HAL: memory protection unit * Core: prohibit NULL dereferencing, even for reads. * Applications: fix NULL dereference * Core: stack protection by MPU * MPU: stack region alignment * Apps: fix null pointer dereferences * Threads: fix non-null arg check * Desktop settings: fix null pointer dereference * Core: documented null-check hack * Fix null dereference issues * Apps: args check * Core: naming fixes * format code * Core: remove NONNULL specifier * FurHal: move MPU initialization to begining, fix enum naming Co-authored-by: あく <alleteam@gmail.com>
66 lines
No EOL
2 KiB
C
66 lines
No EOL
2 KiB
C
#include <furi_hal_mpu.h>
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#include <stm32wbxx_ll_cortex.h>
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#define FURI_HAL_MPU_ATTRIBUTES \
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(LL_MPU_ACCESS_BUFFERABLE | LL_MPU_ACCESS_CACHEABLE | LL_MPU_ACCESS_SHAREABLE | \
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LL_MPU_TEX_LEVEL1 | LL_MPU_INSTRUCTION_ACCESS_ENABLE)
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#define FURI_HAL_MPU_STACK_PROTECT_REGION FuriHalMPURegionSize32B
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void furi_hal_mpu_init() {
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furi_hal_mpu_enable();
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// NULL pointer dereference protection
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furi_hal_mpu_protect_no_access(FuriHalMpuRegionNULL, 0x00, FuriHalMPURegionSize1MB);
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}
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void furi_hal_mpu_enable() {
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LL_MPU_Enable(LL_MPU_CTRL_PRIVILEGED_DEFAULT);
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}
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void furi_hal_mpu_disable() {
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LL_MPU_Disable();
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}
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void furi_hal_mpu_protect_no_access(
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FuriHalMpuRegion region,
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uint32_t address,
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FuriHalMPURegionSize size) {
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uint32_t size_ll = size;
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size_ll = size_ll << MPU_RASR_SIZE_Pos;
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furi_hal_mpu_disable();
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LL_MPU_ConfigRegion(
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region, 0x00, address, FURI_HAL_MPU_ATTRIBUTES | LL_MPU_REGION_NO_ACCESS | size_ll);
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furi_hal_mpu_enable();
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}
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void furi_hal_mpu_protect_read_only(
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FuriHalMpuRegion region,
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uint32_t address,
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FuriHalMPURegionSize size) {
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uint32_t size_ll = size;
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size_ll = size_ll << MPU_RASR_SIZE_Pos;
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furi_hal_mpu_disable();
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LL_MPU_ConfigRegion(
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region, 0x00, address, FURI_HAL_MPU_ATTRIBUTES | LL_MPU_REGION_PRIV_RO_URO | size_ll);
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furi_hal_mpu_enable();
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}
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void furi_hal_mpu_protect_disable(FuriHalMpuRegion region) {
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furi_hal_mpu_disable();
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LL_MPU_DisableRegion(region);
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furi_hal_mpu_enable();
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}
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void furi_hal_mpu_set_stack_protection(uint32_t* stack) {
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// Protection area address must be aligned to region size
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uint32_t stack_ptr = (uint32_t)stack;
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uint32_t mask = ((1 << (FURI_HAL_MPU_STACK_PROTECT_REGION + 2)) - 1);
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stack_ptr &= ~mask;
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if(stack_ptr < (uint32_t)stack) stack_ptr += (mask + 1);
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furi_hal_mpu_protect_read_only(
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FuriHalMpuRegionStack, stack_ptr, FURI_HAL_MPU_STACK_PROTECT_REGION);
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} |