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Stack sealing for TrustZone context #1037

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Stack sealing for TrustZone context #1037

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9 changes: 8 additions & 1 deletion CMSIS/Core/Template/ARMv8-M/tz_context.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,14 +36,18 @@
#define TZ_PROCESS_STACK_SIZE 256U
#endif

#define TZ_PROCESS_STACK_SEAL_SIZE 8U

#define TZ_PROCESS_STACK_SEAL_VALUE 0xFEF5EDA5FEF5EDA5UL

typedef struct {
uint32_t sp_top; // stack space top
uint32_t sp_limit; // stack space limit
uint32_t sp; // current stack pointer
} stack_info_t;

static stack_info_t ProcessStackInfo [TZ_PROCESS_STACK_SLOTS];
static uint64_t ProcessStackMemory[TZ_PROCESS_STACK_SLOTS][TZ_PROCESS_STACK_SIZE/8U];
static uint64_t ProcessStackMemory[TZ_PROCESS_STACK_SLOTS][(TZ_PROCESS_STACK_SIZE + TZ_PROCESS_STACK_SEAL_SIZE)/8U];
static uint32_t ProcessStackFreeSlot = 0xFFFFFFFFU;


Expand All @@ -62,6 +66,9 @@ uint32_t TZ_InitContextSystem_S (void) {
ProcessStackInfo[n].sp_limit = (uint32_t)&ProcessStackMemory[n];
ProcessStackInfo[n].sp_top = (uint32_t)&ProcessStackMemory[n] + TZ_PROCESS_STACK_SIZE;
*((uint32_t *)ProcessStackMemory[n]) = n + 1U;

/* Seal each process stack. */
ProcessStackMemory[n][TZ_PROCESS_STACK_SIZE/8U] = TZ_PROCESS_STACK_SEAL_VALUE;
}
*((uint32_t *)ProcessStackMemory[--n]) = 0xFFFFFFFFU;

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9 changes: 8 additions & 1 deletion CMSIS/RTOS2/RTX/Examples/TrustZoneV8M/RTOS/CM33_s/tz_context.c
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,18 @@
#define TZ_PROCESS_STACK_SIZE 256U
#endif

#define TZ_PROCESS_STACK_SEAL_SIZE 8U

#define TZ_PROCESS_STACK_SEAL_VALUE 0xFEF5EDA5FEF5EDA5UL

typedef struct {
uint32_t sp_top; // stack space top
uint32_t sp_limit; // stack space limit
uint32_t sp; // current stack pointer
} stack_info_t;

static stack_info_t ProcessStackInfo [TZ_PROCESS_STACK_SLOTS];
static uint64_t ProcessStackMemory[TZ_PROCESS_STACK_SLOTS][TZ_PROCESS_STACK_SIZE/8U];
static uint64_t ProcessStackMemory[TZ_PROCESS_STACK_SLOTS][(TZ_PROCESS_STACK_SIZE + TZ_PROCESS_STACK_SEAL_SIZE)/8U];
static uint32_t ProcessStackFreeSlot = 0xFFFFFFFFU;


Expand All @@ -65,6 +69,9 @@ uint32_t TZ_InitContextSystem_S (void) {
ProcessStackInfo[n].sp_limit = (uint32_t)&ProcessStackMemory[n];
ProcessStackInfo[n].sp_top = (uint32_t)&ProcessStackMemory[n] + TZ_PROCESS_STACK_SIZE;
*((uint32_t *)ProcessStackMemory[n]) = n + 1U;

/* Seal each process stack. */
ProcessStackMemory[n][TZ_PROCESS_STACK_SIZE/8U] = TZ_PROCESS_STACK_SEAL_VALUE;
}
*((uint32_t *)ProcessStackMemory[--n]) = 0xFFFFFFFFU;

Expand Down
9 changes: 8 additions & 1 deletion CMSIS/RTOS2/RTX/Examples/TrustZoneV8M/RTOS_Faults/CM33_s/tz_context.c
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,18 @@
#define TZ_PROCESS_STACK_SIZE 256U
#endif

#define TZ_PROCESS_STACK_SEAL_SIZE 8U

#define TZ_PROCESS_STACK_SEAL_VALUE 0xFEF5EDA5FEF5EDA5UL

typedef struct {
uint32_t sp_top; // stack space top
uint32_t sp_limit; // stack space limit
uint32_t sp; // current stack pointer
} stack_info_t;

static stack_info_t ProcessStackInfo [TZ_PROCESS_STACK_SLOTS];
static uint64_t ProcessStackMemory[TZ_PROCESS_STACK_SLOTS][TZ_PROCESS_STACK_SIZE/8U];
static uint64_t ProcessStackMemory[TZ_PROCESS_STACK_SLOTS][(TZ_PROCESS_STACK_SIZE + TZ_PROCESS_STACK_SEAL_SIZE)/8U];
static uint32_t ProcessStackFreeSlot = 0xFFFFFFFFU;


Expand All @@ -65,6 +69,9 @@ uint32_t TZ_InitContextSystem_S (void) {
ProcessStackInfo[n].sp_limit = (uint32_t)&ProcessStackMemory[n];
ProcessStackInfo[n].sp_top = (uint32_t)&ProcessStackMemory[n] + TZ_PROCESS_STACK_SIZE;
*((uint32_t *)ProcessStackMemory[n]) = n + 1U;

/* Seal each process stack. */
ProcessStackMemory[n][TZ_PROCESS_STACK_SIZE/8U] = TZ_PROCESS_STACK_SEAL_VALUE;
}
*((uint32_t *)ProcessStackMemory[--n]) = 0xFFFFFFFFU;

Expand Down