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authorOleg Nesterov <oleg@redhat.com>2012-06-15 17:43:47 +0200
committerIngo Molnar <mingo@kernel.org>2012-06-16 09:10:47 +0200
commiteb2bf57bee42c7565032f93adaa211e2c9fcc52c (patch)
tree98eb3ecffb5e8489b6a026788880e80f5f9a1a92 /kernel/events
parentfc36f59565861af2e897225bc3782479a26c5d5a (diff)
uprobes: No need to re-check vma_address() in write_opcode()
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> Cc: Anton Arapov <anton@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20120615154347.GA9604@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/uprobes.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 2db1d94d7dfc..14c71a2aadad 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)