Messages in this thread Patch in this message | | | Date | Fri, 15 Jun 2012 17:43:47 +0200 | From | Oleg Nesterov <> | Subject | [PATCH 10/15] uprobes: no need to re-check vma_address() in write_opcode() |
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write_opcode() is called by register_for_each_vma() and uprobe_mmap() paths. In both cases the caller has already verified this vaddr under mmap_sem, no need to re-check.
Note also that this check is wrong anyway, we should not truncate loff_t returned by vma_address() if we do not trust this mapping.
Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> --- kernel/events/uprobes.c | 5 ----- 1 files changed, 0 insertions(+), 5 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 2db1d94..14c71a2 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -211,7 +211,6 @@ static int write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, struct vm_area_struct *vma; struct uprobe *uprobe; unsigned long pgoff; - loff_t addr; int ret; retry: /* Read the page with vaddr into memory */ @@ -235,10 +234,6 @@ retry: if (mapping != vma->vm_file->f_mapping) goto put_out; - addr = vma_address(vma, uprobe->offset); - if (vaddr != (unsigned long)addr) - goto put_out; - ret = -ENOMEM; new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, vaddr); if (!new_page) -- 1.5.5.1
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