From: Graf Yang Date: Tue, 21 Jul 2009 02:26:57 +0000 (+0000) Subject: Blackfin: fix MPU handling of invalid memory accesses X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=36b841288656b9b30b5d2add2fd136ac7eab5867;p=linux-beck.git Blackfin: fix MPU handling of invalid memory accesses The protect_page() function was incorrectly setting up the hardware tables based on possible access capabilities rather than the actual requested values. This means we would grant more access to mmap-ed pages than we should have. Once we fix this, we need to tweak the signal generated by such accesses to aline ourselves with other ports. This allows the LTP mmap0{5,6,7} cases to run properly. Signed-off-by: Graf Yang Signed-off-by: Mike Frysinger --- diff --git a/arch/blackfin/include/asm/mmu_context.h b/arch/blackfin/include/asm/mmu_context.h index 944e29faae48..040410bb07e1 100644 --- a/arch/blackfin/include/asm/mmu_context.h +++ b/arch/blackfin/include/asm/mmu_context.h @@ -127,17 +127,17 @@ static inline void protect_page(struct mm_struct *mm, unsigned long addr, unsigned long idx = page >> 5; unsigned long bit = 1 << (page & 31); - if (flags & VM_MAYREAD) + if (flags & VM_READ) mask[idx] |= bit; else mask[idx] &= ~bit; mask += page_mask_nelts; - if (flags & VM_MAYWRITE) + if (flags & VM_WRITE) mask[idx] |= bit; else mask[idx] &= ~bit; mask += page_mask_nelts; - if (flags & VM_MAYEXEC) + if (flags & VM_EXEC) mask[idx] |= bit; else mask[idx] &= ~bit; diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c index 18c6cd4150f8..644e35e33553 100644 --- a/arch/blackfin/kernel/traps.c +++ b/arch/blackfin/kernel/traps.c @@ -411,7 +411,7 @@ asmlinkage void trap_c(struct pt_regs *fp) /* 0x23 - Data CPLB protection violation, handled here */ case VEC_CPLB_VL: info.si_code = ILL_CPLB_VI; - sig = SIGBUS; + sig = SIGSEGV; strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE); CHK_DEBUGGER_TRAP_MAYBE(); break;