eCryptfs: bound the packet-length peek to the user buffer

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ecryptfs_miscdev_write() accepts the minimum one-byte packet-length
encoding, but always copies the maximum two-byte encoding from userspace
before parsing it. A six-byte message therefore reads one byte beyond the
submitted user buffer.

Zero-initialize the peek buffer and copy only the packet-length bytes
present. The existing exact packet-size check still rejects truncated
two-byte encodings after the parser determines their encoded length.

Fixes: 8bf2debd5f ("eCryptfs: introduce device handle for userspace daemon communications")
Cc: <stable@vger.kernel.org>
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Signed-off-by: Tyler Hicks <code@tyhicks.com>

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Pengpeng Hou 2026-07-20 19:56:24 +08:00 • committed by Tyler Hicks

parent e97bbe1b2b

commit 95540462e6

1 changed files with 3 additions and 2 deletions

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fs/ecryptfs/miscdev.c

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