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7a4ce92d15sprd_platform_compr_open() allocates the stage 0 IRAM buffer (32K data
area) and the stage 1 DDR buffer (2M data area) with fixed sizes, but
sprd_platform_compr_copy() derives all copy lengths from the user
controlled runtime->fragment_size and the write() count, never
comparing them against the physical buffer sizes. The compress core
only checks fragment_size * fragments for an u32 overflow in
snd_compress_check_input(), so a local user can configure a logical
buffer of up to ~4GB via SNDRV_COMPRESS_SET_PARAMS, far exceeding the
fixed allocations.
A fragment_size larger than the 32K IRAM data area makes the stage 0
copy_from_user() overflow past the IRAM allocation, and a buffer_size
larger than the 2M DDR buffer makes the wrapping copy at the end of
sprd_platform_compr_copy() write fully user controlled data past the
buffer. No SNDRV_PCM_TRIGGER_START is needed, a write() in SETUP
state reaches the copy callback directly.
Reject parameters that do not fit into the fixed buffers in
set_params(), and fix the advertised max fragment size: 128K never
fitted into the 32K IRAM buffer. The caps values may have been carried over
from the qdsp6 driver, which allocates its buffers according to the
advertised maxima, unlike this driver. With 32K as max fragment size
the advertised limits are self-consistent: 32K * 64 = 2M equals the
DDR buffer size.
Discovered by Atuin - Automated Vulnerability Discovery Engine.
Fixes:
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