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fix mremap() vs. ioctx_kill() race

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teach ->mremap() method to return an error and have it fail for
aio mappings in process of being killed

Note that in case of ->mremap() failure we need to undo move_page_tables()
we'd already done; we could call ->mremap() first, but then the failure of
move_page_tables() would require undoing whatever _successful_ ->mremap()
has done, which would be a lot more headache in general.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2015-04-06 17:48:54 -04:00
commit b2edffdd91
3 changed files with 20 additions and 9 deletions
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10
mm/mremap.c
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@ -286,8 +286,14 @@ static unsigned long move_vma(struct vm_area_struct *vma,
old_len = new_len;
old_addr = new_addr;
new_addr = -ENOMEM;
} else if (vma->vm_file && vma->vm_file->f_op->mremap)
vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
} else if (vma->vm_file && vma->vm_file->f_op->mremap) {
err = vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
if (err < 0) {
move_page_tables(new_vma, new_addr, vma, old_addr,
moved_len, true);
return err;
}
}
/* Conceal VM_ACCOUNT so old reservation is not undone */
if (vm_flags & VM_ACCOUNT) {