From e18e7dd33454f277b9438af66d25984362278021 Mon Sep 17 00:00:00 2001 From: Barry Song Date: Mon, 7 Dec 2009 10:05:58 +0000 Subject: [PATCH] Blackfin: fix MPU page permission masks overflow when dealing with async memory Attempting to use the MPU while doing XIP out of parallel flash hooked up to the async memory bus would often result in random crashes as the MPU slowly corrupted memory. The fallout here is that the async banks gain MPU protection from user space too. So any accesses have to go through the mmap() interface rather than just using hardcoded pointers. Signed-off-by: Barry Song Signed-off-by: Mike Frysinger --- arch/blackfin/include/asm/mmu_context.h | 14 +++++++++--- arch/blackfin/kernel/cplb-mpu/cplbmgr.c | 30 ++++++++++++++++++------- arch/blackfin/kernel/setup.c | 5 +++++ 3 files changed, 38 insertions(+), 11 deletions(-) diff --git a/arch/blackfin/include/asm/mmu_context.h b/arch/blackfin/include/asm/mmu_context.h index ae8ef4ffd806..7f363d7e43a5 100644 --- a/arch/blackfin/include/asm/mmu_context.h +++ b/arch/blackfin/include/asm/mmu_context.h @@ -13,6 +13,7 @@ #include #include #include +#include /* Note: L1 stacks are CPU-private things, so we bluntly disable this feature in SMP mode, and use the per-CPU scratch SRAM bank only to @@ -117,9 +118,16 @@ static inline void protect_page(struct mm_struct *mm, unsigned long addr, unsigned long flags) { unsigned long *mask = mm->context.page_rwx_mask; - unsigned long page = addr >> 12; - unsigned long idx = page >> 5; - unsigned long bit = 1 << (page & 31); + unsigned long page; + unsigned long idx; + unsigned long bit; + + if (unlikely(addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE)) + page = (addr - (ASYNC_BANK0_BASE - _ramend)) >> 12; + else + page = addr >> 12; + idx = page >> 5; + bit = 1 << (page & 31); if (flags & VM_READ) mask[idx] |= bit; diff --git a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c index 930c01c06813..d4cc53a0ef89 100644 --- a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c +++ b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c @@ -114,10 +114,15 @@ static noinline int dcplb_miss(unsigned int cpu) d_data = L2_DMEMORY; } else if (addr >= physical_mem_end) { if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) { - addr &= ~(4 * 1024 * 1024 - 1); - d_data &= ~PAGE_SIZE_4KB; - d_data |= PAGE_SIZE_4MB; - d_data |= CPLB_USER_RD | CPLB_USER_WR; + mask = current_rwx_mask[cpu]; + if (mask) { + int page = (addr - (ASYNC_BANK0_BASE - _ramend)) >> PAGE_SHIFT; + int idx = page >> 5; + int bit = 1 << (page & 31); + + if (mask[idx] & bit) + d_data |= CPLB_USER_RD; + } } else if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH && (status & (FAULT_RW | FAULT_USERSUPV)) == FAULT_USERSUPV) { addr &= ~(1 * 1024 * 1024 - 1); @@ -204,10 +209,19 @@ static noinline int icplb_miss(unsigned int cpu) i_data = L2_IMEMORY; } else if (addr >= physical_mem_end) { if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) { - addr &= ~(4 * 1024 * 1024 - 1); - i_data &= ~PAGE_SIZE_4KB; - i_data |= PAGE_SIZE_4MB; - i_data |= CPLB_USER_RD; + if (!(status & FAULT_USERSUPV)) { + unsigned long *mask = current_rwx_mask[cpu]; + + if (mask) { + int page = (addr - (ASYNC_BANK0_BASE - _ramend)) >> PAGE_SHIFT; + int idx = page >> 5; + int bit = 1 << (page & 31); + + mask += 2 * page_mask_nelts; + if (mask[idx] & bit) + i_data |= CPLB_USER_RD; + } + } } else if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH && (status & FAULT_USERSUPV)) { addr &= ~(1 * 1024 * 1024 - 1); diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c index 69cbc1a81201..8dc7ee1ef336 100644 --- a/arch/blackfin/kernel/setup.c +++ b/arch/blackfin/kernel/setup.c @@ -597,7 +597,12 @@ static __init void memory_setup(void) } #ifdef CONFIG_MPU +#if defined(CONFIG_ROMFS_ON_MTD) && defined(CONFIG_MTD_ROM) + page_mask_nelts = (((_ramend + ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE - + ASYNC_BANK0_BASE) >> PAGE_SHIFT) + 31) / 32; +#else page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32; +#endif page_mask_order = get_order(3 * page_mask_nelts * sizeof(long)); #endif -- 2.20.1