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authorOleg Nesterov <oleg@redhat.com>2012-07-29 20:22:36 +0200
committerIngo Molnar <mingo@kernel.org>2012-07-30 11:27:22 +0200
commit6dab3cc078e3da0d26534410bc9e018a17031d95 (patch)
treea740adc15cd054401f197182d285e9906747a738 /mm/mmap.c
parentaefd8933d445abf7ff0d4027c624737898827bcd (diff)
downloadop-kernel-dev-6dab3cc078e3da0d26534410bc9e018a17031d95.zip
op-kernel-dev-6dab3cc078e3da0d26534410bc9e018a17031d95.tar.gz
uprobes: Remove copy_vma()->uprobe_mmap()
Remove copy_vma()->uprobe_mmap(new_vma), it is absolutely wrong. This new_vma was just initialized to represent the new unmapped area, [vm_start, vm_end) was returned by get_unmapped_area() in the caller. This means that uprobe_mmap()->get_user_pages() will fail for sure, simply because find_vma() can never succeed. And I verified that sys_mremap()->mremap_to() indeed always fails with the wrong ENOMEM code if [addr, addr+old_len] is probed. And why this uprobe_mmap() was added? I believe the intent was wrong. Note that the caller is going to do move_page_tables(), all registered uprobes are already faulted in, we only change the virtual addresses. NOTE: However, somehow we need to close the race with uprobe_register() which relies on map_info->vaddr. This needs another fix I'll try to do later. Probably we need uprobe_mmap() in move_vma() but we can not do this right now, this can confuse uprobes_state.counter (which I still hope we are going to kill). 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/20120729182236.GA20342@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 3edfcdf..e5a4614 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2418,9 +2418,6 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
if (new_vma->vm_file) {
get_file(new_vma->vm_file);
- if (uprobe_mmap(new_vma))
- goto out_free_mempol;
-
if (vma->vm_flags & VM_EXECUTABLE)
added_exe_file_vma(mm);
}
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