Maureen Helm 34f3837896 arch: arm: mpu: Lock irqs while reprogramming the nxp mpu ... The nxp mpu uses the logical OR of access permissions when multiple region descriptors apply to a given memory access. This means that we must partition the sram into two non-overlapping regions to implement the mpu stack guard. This partitioning gets reconfigured at every context switch, and if an interrupt occurs during this time, it can cause a fault because we do not have a valid mpu region descriptor for the sram. This scenario was observed on frdm_k64f in tests/posix/common before commit 2895da02a4, which changed timing. In this case, we couldn't even print fault information to the console and the hardware would reset. It looked a lot like a watchdog reset, unless you attached a debugger to see the fault. A similar problem was fixed in commit ec424b7a45, but this change temporarily disabled the mpu. Fix both cases by locking interrupts during the critical sections, as this is more secure than disabling the mpu. Signed-off-by: Maureen Helm <maureen.helm@nxp.com>		2019-04-15 20:37:27 -04:00
..
arc	arch: arc: optimize the macros of thread stack	2019-04-09 18:39:48 -04:00
arm	arch: arm: mpu: Lock irqs while reprogramming the nxp mpu	2019-04-15 20:37:27 -04:00
common
nios2
posix
riscv32
x86
x86_64
xtensa
CMakeLists.txt
Kconfig