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Change History

In the Linux kernel, the following vulnerability has been resolved:

mm/ksm: fix race with VMA iteration and mm_struct teardown

exit_mmap() will tear down the VMAs and maple tree with the mmap_lock held
in write mode.  Ensure that the maple tree is still valid by checking
ksm_test_exit() after taking the mmap_lock in read mode, but before the
for_each_vma() iterator dereferences a destroyed maple tree.

Since the maple tree is destroyed, the flags telling lockdep to check an
external lock has been cleared.  Skip the for_each_vma() iterator to avoid
dereferencing a maple tree without the external lock flag, which would
create a lockdep warning.

https://git.kernel.org/stable/c/286b0cab31bac29960e5684f6fb331d42f03b363

https://git.kernel.org/stable/c/6db504ce55bdbc575723938fc480713c9183f6a2

https://git.kernel.org/stable/c/b4f664ffd8f78c05a1fd542a28bc5a11e994c014