[UBUNTU OEM-5.7 0/1] CVE-2022-2590

[Thadeu Lima de Souza Cascardo]

[Impact]
Attackers can write to shmem files (on tmpfs, for example) without having write permissions.

[Fix]
The upstream fix is not appropriate to 5.17 and the suggestion was to revert the offending commit.

[Test case]
PoC was tested and stopped working with the revert applied.

Thadeu Lima de Souza Cascardo (1):
  UBUNTU: SAUCE: Revert "mm/shmem: unconditionally set pte dirty in
    mfill_atomic_install_pte"

 mm/shmem.c       | 1 +
 mm/userfaultfd.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

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2.34.1