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| author | Graf Yang <graf.yang@analog.com> | 2009-07-21 02:26:57 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-09-16 21:31:55 -0400 |
| commit | 36b841288656b9b30b5d2add2fd136ac7eab5867 (patch) | |
| tree | b3faec0b85a2814216c791de99435e74a43b6148 /arch/blackfin | |
| parent | 8fc4dd9e876cbda4dfe09ca85e4e1520b36dce77 (diff) | |
| download | op-kernel-dev-36b841288656b9b30b5d2add2fd136ac7eab5867.zip op-kernel-dev-36b841288656b9b30b5d2add2fd136ac7eab5867.tar.gz | |
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 <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/include/asm/mmu_context.h | 6 | ||||
| -rw-r--r-- | arch/blackfin/kernel/traps.c | 2 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/blackfin/include/asm/mmu_context.h b/arch/blackfin/include/asm/mmu_context.h index 944e29f..040410b 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 18c6cd4..644e35e 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; |
