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Message-ID: <20070210091521.GA7350@bitbox.mine.nu> Date: Sat, 10 Feb 2007 11:15:21 +0200 From: Imre Deak <imre.deak@...idboot.com> To: linux-kernel@...r.kernel.org Cc: rmk@....linux.org.uk Subject: [PATCH] DEV: zero: use correct pgprot for zeromapping Instead of PAGE_COPY use the pgprot bits established already at original mapping time of the VMA. This will also include any architecture specific bits setup through protection_map. zeromap_page_range will take care of COW'ing the passed pgprot. This fixes at least one problem on ARM where reading /dev/zero in one process created global PTE mappings thus - practically - zeroing out memory ranges of all other processes. Signed-off-by: Imre Deak <imre.deak@...idboot.com> --- drivers/char/mem.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/char/mem.c b/drivers/char/mem.c index f5c160c..9a7264f 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -646,7 +646,7 @@ static inline size_t read_zero_pagealigned(char __user * buf, size_t size) count = size; zap_page_range(vma, addr, count, NULL); - if (zeromap_page_range(vma, addr, count, PAGE_COPY)) + if (zeromap_page_range(vma, addr, count, vma->vm_page_prot)) break; size -= count; -- 1.4.4.3.GIT - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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