Vulnerability CVE-2024-35939
Published: 2024-05-19

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

dma-direct: Leak pages on dma_set_decrypted() failure

On TDX it is possible for the untrusted host to cause
set_memory_encrypted() or set_memory_decrypted() to fail such that an
error is returned and the resulting memory is shared. Callers need to
take care to handle these errors to avoid returning decrypted (shared)
memory to the page allocator, which could lead to functional or security
issues.

DMA could free decrypted/shared pages if dma_set_decrypted() fails. This
should be a rare case. Just leak the pages in this case instead of
freeing them.

 References:
https://git.kernel.org/stable/c/4e0cfb25d49da2e6261ad582f58ffa5b5dd8c8e9
https://git.kernel.org/stable/c/4031b72ca747a1e6e9ae4fa729e765b43363d66a
https://git.kernel.org/stable/c/b57326c96b7bc7638aa8c44e12afa2defe0c934c
https://git.kernel.org/stable/c/b9fa16949d18e06bdf728a560f5c8af56d2bdcaf
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