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Date: Sat, 05 Dec 2009 19:08:50 +0000 From: Al Viro <viro@....linux.org.uk> To: linux-arch@...r.kernel.org Cc: torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org Subject: [RFC][PATCH 5/18] fix the arch checks in MREMAP_FIXED case Signed-off-by: Al Viro <viro@...iv.linux.org.uk> --- mm/mremap.c | 19 +++++++++++++++++-- 1 files changed, 17 insertions(+), 2 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 9d07539..84efffb 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -325,6 +325,7 @@ static unsigned long mremap_to(unsigned long addr, struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; + unsigned long map_flags; if (new_addr & ~PAGE_MASK) goto out; @@ -362,9 +363,23 @@ static unsigned long mremap_to(unsigned long addr, goto out; } - ret = move_vma(vma, addr, old_len, new_len, new_addr); + map_flags = MAP_FIXED; + if (vma->vm_flags & VM_MAYSHARE) + map_flags |= MAP_SHARED; + ret = arch_mmap_check(new_addr, new_len, map_flags); + if (ret) + goto out1; + ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + + ((addr - vma->vm_start) >> PAGE_SHIFT), + map_flags); if (ret & ~PAGE_MASK) - vm_unacct_memory(charged); + goto out1; + + ret = move_vma(vma, addr, old_len, new_len, new_addr); + if (!(ret & ~PAGE_MASK)) + goto out; +out1: + vm_unacct_memory(charged); out: return ret; -- 1.5.6.5 -- 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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