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authorOleg Nesterov <oleg@redhat.com>2012-07-29 20:22:44 +0200
committerIngo Molnar <mingo@kernel.org>2012-07-30 11:27:24 +0200
commitf4d6dfe55115efe981b4b5f37183ddccaaa792f0 (patch)
tree2d81b1b5a17334895282b42de6134b4e2dcf9f24 /kernel
parentcb113b47d098185f3f1f67e8300d05ddce842b66 (diff)
downloadop-kernel-dev-f4d6dfe55115efe981b4b5f37183ddccaaa792f0.zip
op-kernel-dev-f4d6dfe55115efe981b4b5f37183ddccaaa792f0.tar.gz
uprobes: Fix register_for_each_vma()->vma_address() check
1. register_for_each_vma() checks that vma_address() == vaddr, but this is not enough. We should also ensure that vaddr >= vm_start, find_vma() guarantees "vaddr < vm_end" only. 2. After the prevous changes, register_for_each_vma() is the only reason why vma_address() has to return loff_t, all other users know that we have the valid mapping at this offset and thus the overflow is not possible. Change the code to use vaddr_to_offset() instead, imho this looks more clean/understandable and now we can change vma_address(). 3. While at it, remove the unnecessary type-cast. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com> Cc: Anton Arapov <anton@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20120729182244.GA20362@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/uprobes.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index b03256c..cdc3c95 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -823,12 +823,13 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
goto free;
down_write(&mm->mmap_sem);
- vma = find_vma(mm, (unsigned long)info->vaddr);
- if (!vma || !valid_vma(vma, is_register))
+ vma = find_vma(mm, info->vaddr);
+ if (!vma || !valid_vma(vma, is_register) ||
+ vma->vm_file->f_mapping->host != uprobe->inode)
goto unlock;
- if (vma->vm_file->f_mapping->host != uprobe->inode ||
- vma_address(vma, uprobe->offset) != info->vaddr)
+ if (vma->vm_start > info->vaddr ||
+ vaddr_to_offset(vma, info->vaddr) != uprobe->offset)
goto unlock;
if (is_register) {
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